/* GStreamer * * Copyright (C) 2001-2002 Ronald Bultje * 2006 Edgard Lima * * gstv4l2object.c: base class for V4L2 elements * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Library General Public License as published * by the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. This library is distributed in the hope * that it will be useful, but WITHOUT ANY WARRANTY; without even the * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR * PURPOSE. See the GNU Library General Public License for more details. * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, * USA. */ /* FIXME 0.11: suppress warnings for deprecated API such as GValueArray * with newer GLib versions (>= 2.31.0) */ #define GLIB_DISABLE_DEPRECATION_WARNINGS #ifdef HAVE_CONFIG_H #include #endif #include #include #include #include #include #ifdef HAVE_GUDEV #include #endif #include "v4l2_calls.h" #include "gstv4l2tuner.h" #include "gstv4l2colorbalance.h" #include "gst/gst-i18n-plugin.h" #include GST_DEBUG_CATEGORY_EXTERN (v4l2_debug); #define GST_CAT_DEFAULT v4l2_debug #define DEFAULT_PROP_DEVICE_NAME NULL #define DEFAULT_PROP_DEVICE_FD -1 #define DEFAULT_PROP_FLAGS 0 #define DEFAULT_PROP_TV_NORM 0 #define DEFAULT_PROP_CHANNEL NULL #define DEFAULT_PROP_FREQUENCY 0 #define DEFAULT_PROP_IO_MODE GST_V4L2_IO_AUTO #define ENCODED_BUFFER_SIZE (1 * 1024 * 1024) enum { PROP_0, V4L2_STD_OBJECT_PROPS, }; /* * common format / caps utilities: */ typedef enum { GST_V4L2_RAW = 1 << 0, GST_V4L2_CODEC = 1 << 1, GST_V4L2_TRANSPORT = 1 << 2, GST_V4L2_NO_PARSE = 1 << 3, GST_V4L2_ALL = 0xffff } GstV4L2FormatFlags; typedef struct { guint32 format; gboolean dimensions; GstV4L2FormatFlags flags; } GstV4L2FormatDesc; static const GstV4L2FormatDesc gst_v4l2_formats[] = { /* from Linux 2.6.15 videodev2.h */ {V4L2_PIX_FMT_RGB332, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_RGB555, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_RGB565, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_RGB555X, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_RGB565X, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_BGR24, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_RGB24, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_BGR32, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_RGB32, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_GREY, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_YVU410, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_YVU420, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_YUYV, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_UYVY, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_YUV422P, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_YUV411P, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_Y41P, TRUE, GST_V4L2_RAW}, /* two planes -- one Y, one Cr + Cb interleaved */ {V4L2_PIX_FMT_NV12, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_NV12M, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_NV12MT, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_NV21, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_NV21M, TRUE, GST_V4L2_RAW}, /* The following formats are not defined in the V4L2 specification */ {V4L2_PIX_FMT_YUV410, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_YUV420, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_YYUV, TRUE, GST_V4L2_RAW}, {V4L2_PIX_FMT_HI240, TRUE, GST_V4L2_RAW}, /* see http://www.siliconimaging.com/RGB%20Bayer.htm */ {V4L2_PIX_FMT_SBGGR8, TRUE, GST_V4L2_CODEC}, /* compressed formats */ {V4L2_PIX_FMT_MJPEG, FALSE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_JPEG, FALSE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_PJPG, FALSE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_DV, FALSE, GST_V4L2_TRANSPORT}, {V4L2_PIX_FMT_MPEG, FALSE, GST_V4L2_TRANSPORT}, {V4L2_PIX_FMT_MPEG1, FALSE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_MPEG2, FALSE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_MPEG4, FALSE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_H263, FALSE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_H264, FALSE, GST_V4L2_CODEC}, /* VP8 not parseable */ {V4L2_PIX_FMT_VP8, FALSE, GST_V4L2_CODEC | GST_V4L2_NO_PARSE}, /* Vendor-specific formats */ {V4L2_PIX_FMT_WNVA, TRUE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_SN9C10X, TRUE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_PWC1, TRUE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_PWC2, TRUE, GST_V4L2_CODEC}, {V4L2_PIX_FMT_YVYU, TRUE, GST_V4L2_RAW}, }; #define GST_V4L2_FORMAT_COUNT (G_N_ELEMENTS (gst_v4l2_formats)) static GSList *gst_v4l2_object_get_format_list (GstV4l2Object * v4l2object); #define GST_TYPE_V4L2_DEVICE_FLAGS (gst_v4l2_device_get_type ()) static GType gst_v4l2_device_get_type (void) { static GType v4l2_device_type = 0; if (v4l2_device_type == 0) { static const GFlagsValue values[] = { {V4L2_CAP_VIDEO_CAPTURE, "Device supports video capture", "capture"}, {V4L2_CAP_VIDEO_OUTPUT, "Device supports video playback", "output"}, {V4L2_CAP_VIDEO_OVERLAY, "Device supports video overlay", "overlay"}, {V4L2_CAP_VBI_CAPTURE, "Device supports the VBI capture", "vbi-capture"}, {V4L2_CAP_VBI_OUTPUT, "Device supports the VBI output", "vbi-output"}, {V4L2_CAP_TUNER, "Device has a tuner or modulator", "tuner"}, {V4L2_CAP_AUDIO, "Device has audio inputs or outputs", "audio"}, {0, NULL, NULL} }; v4l2_device_type = g_flags_register_static ("GstV4l2DeviceTypeFlags", values); } return v4l2_device_type; } #define GST_TYPE_V4L2_TV_NORM (gst_v4l2_tv_norm_get_type ()) static GType gst_v4l2_tv_norm_get_type (void) { static GType v4l2_tv_norm = 0; if (!v4l2_tv_norm) { static const GEnumValue tv_norms[] = { {0, "none", "none"}, {V4L2_STD_NTSC, "NTSC", "NTSC"}, {V4L2_STD_NTSC_M, "NTSC-M", "NTSC-M"}, {V4L2_STD_NTSC_M_JP, "NTSC-M-JP", "NTSC-M-JP"}, {V4L2_STD_NTSC_M_KR, "NTSC-M-KR", "NTSC-M-KR"}, {V4L2_STD_NTSC_443, "NTSC-443", "NTSC-443"}, {V4L2_STD_PAL, "PAL", "PAL"}, {V4L2_STD_PAL_BG, "PAL-BG", "PAL-BG"}, {V4L2_STD_PAL_B, "PAL-B", "PAL-B"}, {V4L2_STD_PAL_B1, "PAL-B1", "PAL-B1"}, {V4L2_STD_PAL_G, "PAL-G", "PAL-G"}, {V4L2_STD_PAL_H, "PAL-H", "PAL-H"}, {V4L2_STD_PAL_I, "PAL-I", "PAL-I"}, {V4L2_STD_PAL_DK, "PAL-DK", "PAL-DK"}, {V4L2_STD_PAL_D, "PAL-D", "PAL-D"}, {V4L2_STD_PAL_D1, "PAL-D1", "PAL-D1"}, {V4L2_STD_PAL_K, "PAL-K", "PAL-K"}, {V4L2_STD_PAL_M, "PAL-M", "PAL-M"}, {V4L2_STD_PAL_N, "PAL-N", "PAL-N"}, {V4L2_STD_PAL_Nc, "PAL-Nc", "PAL-Nc"}, {V4L2_STD_PAL_60, "PAL-60", "PAL-60"}, {V4L2_STD_SECAM, "SECAM", "SECAM"}, {V4L2_STD_SECAM_B, "SECAM-B", "SECAM-B"}, {V4L2_STD_SECAM_G, "SECAM-G", "SECAM-G"}, {V4L2_STD_SECAM_H, "SECAM-H", "SECAM-H"}, {V4L2_STD_SECAM_DK, "SECAM-DK", "SECAM-DK"}, {V4L2_STD_SECAM_D, "SECAM-D", "SECAM-D"}, {V4L2_STD_SECAM_K, "SECAM-K", "SECAM-K"}, {V4L2_STD_SECAM_K1, "SECAM-K1", "SECAM-K1"}, {V4L2_STD_SECAM_L, "SECAM-L", "SECAM-L"}, {V4L2_STD_SECAM_LC, "SECAM-Lc", "SECAM-Lc"}, {0, NULL, NULL} }; v4l2_tv_norm = g_enum_register_static ("V4L2_TV_norms", tv_norms); } return v4l2_tv_norm; } GType gst_v4l2_io_mode_get_type (void) { static GType v4l2_io_mode = 0; if (!v4l2_io_mode) { static const GEnumValue io_modes[] = { {GST_V4L2_IO_AUTO, "GST_V4L2_IO_AUTO", "auto"}, {GST_V4L2_IO_RW, "GST_V4L2_IO_RW", "rw"}, {GST_V4L2_IO_MMAP, "GST_V4L2_IO_MMAP", "mmap"}, {GST_V4L2_IO_USERPTR, "GST_V4L2_IO_USERPTR", "userptr"}, {GST_V4L2_IO_DMABUF, "GST_V4L2_IO_DMABUF", "dmabuf"}, {GST_V4L2_IO_DMABUF_IMPORT, "GST_V4L2_IO_DMABUF_IMPORT", "dmabuf-import"}, {0, NULL, NULL} }; v4l2_io_mode = g_enum_register_static ("GstV4l2IOMode", io_modes); } return v4l2_io_mode; } void gst_v4l2_object_install_properties_helper (GObjectClass * gobject_class, const char *default_device) { g_object_class_install_property (gobject_class, PROP_DEVICE, g_param_spec_string ("device", "Device", "Device location", default_device, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_DEVICE_NAME, g_param_spec_string ("device-name", "Device name", "Name of the device", DEFAULT_PROP_DEVICE_NAME, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_DEVICE_FD, g_param_spec_int ("device-fd", "File descriptor", "File descriptor of the device", -1, G_MAXINT, DEFAULT_PROP_DEVICE_FD, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_FLAGS, g_param_spec_flags ("flags", "Flags", "Device type flags", GST_TYPE_V4L2_DEVICE_FLAGS, DEFAULT_PROP_FLAGS, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); /** * GstV4l2Src:brightness: * * Picture brightness, or more precisely, the black level */ g_object_class_install_property (gobject_class, PROP_BRIGHTNESS, g_param_spec_int ("brightness", "Brightness", "Picture brightness, or more precisely, the black level", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE)); /** * GstV4l2Src:contrast: * * Picture contrast or luma gain */ g_object_class_install_property (gobject_class, PROP_CONTRAST, g_param_spec_int ("contrast", "Contrast", "Picture contrast or luma gain", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE)); /** * GstV4l2Src:saturation: * * Picture color saturation or chroma gain */ g_object_class_install_property (gobject_class, PROP_SATURATION, g_param_spec_int ("saturation", "Saturation", "Picture color saturation or chroma gain", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE)); /** * GstV4l2Src:hue: * * Hue or color balance */ g_object_class_install_property (gobject_class, PROP_HUE, g_param_spec_int ("hue", "Hue", "Hue or color balance", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | GST_PARAM_CONTROLLABLE)); /** * GstV4l2Src:norm: * * TV norm */ g_object_class_install_property (gobject_class, PROP_TV_NORM, g_param_spec_enum ("norm", "TV norm", "video standard", GST_TYPE_V4L2_TV_NORM, DEFAULT_PROP_TV_NORM, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstV4l2Src:io-mode: * * IO Mode */ g_object_class_install_property (gobject_class, PROP_IO_MODE, g_param_spec_enum ("io-mode", "IO mode", "I/O mode", GST_TYPE_V4L2_IO_MODE, DEFAULT_PROP_IO_MODE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstV4l2Src:extra-controls: * * Additional v4l2 controls for the device. The controls are identified * by the control name (lowercase with '_' for any non-alphanumeric * characters). * * Since: 1.2 */ g_object_class_install_property (gobject_class, PROP_EXTRA_CONTROLS, g_param_spec_boxed ("extra-controls", "Extra Controls", "Extra v4l2 controls (CIDs) for the device", GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstV4l2Src:pixel-aspect-ratio: * * The pixel aspect ratio of the device. This overwrites the pixel aspect * ratio queried from the device. * * Since: 1.2 */ g_object_class_install_property (gobject_class, PROP_PIXEL_ASPECT_RATIO, g_param_spec_string ("pixel-aspect-ratio", "Pixel Aspect Ratio", "Overwrite the pixel aspect ratio of the device", "1/1", G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstV4l2Src:force-aspect-ratio: * * When enabled, the pixel aspect ratio queried from the device or set * with the pixel-aspect-ratio property will be enforced. * * Since: 1.2 */ g_object_class_install_property (gobject_class, PROP_FORCE_ASPECT_RATIO, g_param_spec_boolean ("force-aspect-ratio", "Force aspect ratio", "When enabled, the pixel aspect ratio will be enforced", TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } void gst_v4l2_object_install_m2m_properties_helper (GObjectClass * gobject_class) { g_object_class_install_property (gobject_class, PROP_DEVICE, g_param_spec_string ("device", "Device", "Device location", NULL, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_DEVICE_NAME, g_param_spec_string ("device-name", "Device name", "Name of the device", DEFAULT_PROP_DEVICE_NAME, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_DEVICE_FD, g_param_spec_int ("device-fd", "File descriptor", "File descriptor of the device", -1, G_MAXINT, DEFAULT_PROP_DEVICE_FD, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_OUTPUT_IO_MODE, g_param_spec_enum ("output-io-mode", "Output IO mode", "Output side I/O mode (matches sink pad)", GST_TYPE_V4L2_IO_MODE, DEFAULT_PROP_IO_MODE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_CAPTURE_IO_MODE, g_param_spec_enum ("capture-io-mode", "Capture IO mode", "Capture I/O mode (matches src pad)", GST_TYPE_V4L2_IO_MODE, DEFAULT_PROP_IO_MODE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_EXTRA_CONTROLS, g_param_spec_boxed ("extra-controls", "Extra Controls", "Extra v4l2 controls (CIDs) for the device", GST_TYPE_STRUCTURE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); } GstV4l2Object * gst_v4l2_object_new (GstElement * element, enum v4l2_buf_type type, const char *default_device, GstV4l2GetInOutFunction get_in_out_func, GstV4l2SetInOutFunction set_in_out_func, GstV4l2UpdateFpsFunction update_fps_func) { GstV4l2Object *v4l2object; /* * some default values */ v4l2object = g_new0 (GstV4l2Object, 1); v4l2object->type = type; v4l2object->formats = NULL; v4l2object->element = element; v4l2object->get_in_out_func = get_in_out_func; v4l2object->set_in_out_func = set_in_out_func; v4l2object->update_fps_func = update_fps_func; v4l2object->video_fd = -1; v4l2object->active = FALSE; v4l2object->videodev = g_strdup (default_device); v4l2object->norms = NULL; v4l2object->channels = NULL; v4l2object->colors = NULL; v4l2object->xwindow_id = 0; v4l2object->keep_aspect = TRUE; v4l2object->n_v4l2_planes = 0; v4l2object->no_initial_format = FALSE; return v4l2object; } static gboolean gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object); void gst_v4l2_object_destroy (GstV4l2Object * v4l2object) { g_return_if_fail (v4l2object != NULL); if (v4l2object->videodev) g_free (v4l2object->videodev); if (v4l2object->channel) g_free (v4l2object->channel); if (v4l2object->formats) { gst_v4l2_object_clear_format_list (v4l2object); } if (v4l2object->probed_caps) { gst_caps_unref (v4l2object->probed_caps); } g_free (v4l2object); } static gboolean gst_v4l2_object_clear_format_list (GstV4l2Object * v4l2object) { g_slist_foreach (v4l2object->formats, (GFunc) g_free, NULL); g_slist_free (v4l2object->formats); v4l2object->formats = NULL; return TRUE; } static gint gst_v4l2_object_prop_to_cid (guint prop_id) { gint cid = -1; switch (prop_id) { case PROP_BRIGHTNESS: cid = V4L2_CID_BRIGHTNESS; break; case PROP_CONTRAST: cid = V4L2_CID_CONTRAST; break; case PROP_SATURATION: cid = V4L2_CID_SATURATION; break; case PROP_HUE: cid = V4L2_CID_HUE; break; default: GST_WARNING ("unmapped property id: %d", prop_id); } return cid; } gboolean gst_v4l2_object_set_property_helper (GstV4l2Object * v4l2object, guint prop_id, const GValue * value, GParamSpec * pspec) { switch (prop_id) { case PROP_DEVICE: g_free (v4l2object->videodev); v4l2object->videodev = g_value_dup_string (value); break; case PROP_BRIGHTNESS: case PROP_CONTRAST: case PROP_SATURATION: case PROP_HUE: { gint cid = gst_v4l2_object_prop_to_cid (prop_id); if (cid != -1) { if (GST_V4L2_IS_OPEN (v4l2object)) { gst_v4l2_set_attribute (v4l2object, cid, g_value_get_int (value)); } } return TRUE; } break; case PROP_TV_NORM: v4l2object->tv_norm = g_value_get_enum (value); break; #if 0 case PROP_CHANNEL: if (GST_V4L2_IS_OPEN (v4l2object)) { GstTuner *tuner = GST_TUNER (v4l2object->element); GstTunerChannel *channel = gst_tuner_find_channel_by_name (tuner, (gchar *) g_value_get_string (value)); if (channel) { /* like gst_tuner_set_channel (tuner, channel) without g_object_notify */ gst_v4l2_tuner_set_channel (v4l2object, channel); } } else { g_free (v4l2object->channel); v4l2object->channel = g_value_dup_string (value); } break; case PROP_FREQUENCY: if (GST_V4L2_IS_OPEN (v4l2object)) { GstTuner *tuner = GST_TUNER (v4l2object->element); GstTunerChannel *channel = gst_tuner_get_channel (tuner); if (channel && GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) { /* like gst_tuner_set_frequency (tuner, channel, g_value_get_ulong (value)) without g_object_notify */ gst_v4l2_tuner_set_frequency (v4l2object, channel, g_value_get_ulong (value)); } } else { v4l2object->frequency = g_value_get_ulong (value); } break; #endif case PROP_IO_MODE: v4l2object->req_mode = g_value_get_enum (value); break; case PROP_CAPTURE_IO_MODE: g_return_val_if_fail (!V4L2_TYPE_IS_OUTPUT (v4l2object->type), FALSE); v4l2object->req_mode = g_value_get_enum (value); break; case PROP_OUTPUT_IO_MODE: g_return_val_if_fail (V4L2_TYPE_IS_OUTPUT (v4l2object->type), FALSE); v4l2object->req_mode = g_value_get_enum (value); break; case PROP_EXTRA_CONTROLS:{ const GstStructure *s = gst_value_get_structure (value); if (v4l2object->extra_controls) gst_structure_free (v4l2object->extra_controls); v4l2object->extra_controls = s ? gst_structure_copy (s) : NULL; if (GST_V4L2_IS_OPEN (v4l2object)) gst_v4l2_set_controls (v4l2object, v4l2object->extra_controls); break; } case PROP_PIXEL_ASPECT_RATIO: g_free (v4l2object->par); v4l2object->par = g_new0 (GValue, 1); g_value_init (v4l2object->par, GST_TYPE_FRACTION); if (!g_value_transform (value, v4l2object->par)) { g_warning ("Could not transform string to aspect ratio"); gst_value_set_fraction (v4l2object->par, 1, 1); } GST_DEBUG_OBJECT (v4l2object->element, "set PAR to %d/%d", gst_value_get_fraction_numerator (v4l2object->par), gst_value_get_fraction_denominator (v4l2object->par)); break; case PROP_FORCE_ASPECT_RATIO: v4l2object->keep_aspect = g_value_get_boolean (value); break; default: return FALSE; break; } return TRUE; } gboolean gst_v4l2_object_get_property_helper (GstV4l2Object * v4l2object, guint prop_id, GValue * value, GParamSpec * pspec) { switch (prop_id) { case PROP_DEVICE: g_value_set_string (value, v4l2object->videodev); break; case PROP_DEVICE_NAME: { const guchar *new = NULL; if (GST_V4L2_IS_OPEN (v4l2object)) { new = v4l2object->vcap.card; } else if (gst_v4l2_open (v4l2object)) { new = v4l2object->vcap.card; gst_v4l2_close (v4l2object); } g_value_set_string (value, (gchar *) new); break; } case PROP_DEVICE_FD: { if (GST_V4L2_IS_OPEN (v4l2object)) g_value_set_int (value, v4l2object->video_fd); else g_value_set_int (value, DEFAULT_PROP_DEVICE_FD); break; } case PROP_FLAGS: { guint flags = 0; if (GST_V4L2_IS_OPEN (v4l2object)) { flags |= v4l2object->vcap.capabilities & (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_VIDEO_OVERLAY | V4L2_CAP_VBI_CAPTURE | V4L2_CAP_VBI_OUTPUT | V4L2_CAP_TUNER | V4L2_CAP_AUDIO); if (v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) flags |= V4L2_CAP_VIDEO_CAPTURE; if (v4l2object->vcap.capabilities & V4L2_CAP_VIDEO_OUTPUT_MPLANE) flags |= V4L2_CAP_VIDEO_OUTPUT; } g_value_set_flags (value, flags); break; } case PROP_BRIGHTNESS: case PROP_CONTRAST: case PROP_SATURATION: case PROP_HUE: { gint cid = gst_v4l2_object_prop_to_cid (prop_id); if (cid != -1) { if (GST_V4L2_IS_OPEN (v4l2object)) { gint v; if (gst_v4l2_get_attribute (v4l2object, cid, &v)) { g_value_set_int (value, v); } } } return TRUE; } break; case PROP_TV_NORM: g_value_set_enum (value, v4l2object->tv_norm); break; case PROP_IO_MODE: g_value_set_enum (value, v4l2object->req_mode); break; case PROP_CAPTURE_IO_MODE: g_return_val_if_fail (!V4L2_TYPE_IS_OUTPUT (v4l2object->type), FALSE); g_value_set_enum (value, v4l2object->req_mode); break; case PROP_OUTPUT_IO_MODE: g_return_val_if_fail (V4L2_TYPE_IS_OUTPUT (v4l2object->type), FALSE); g_value_set_enum (value, v4l2object->req_mode); break; case PROP_EXTRA_CONTROLS: gst_value_set_structure (value, v4l2object->extra_controls); break; case PROP_PIXEL_ASPECT_RATIO: if (v4l2object->par) g_value_transform (v4l2object->par, value); break; case PROP_FORCE_ASPECT_RATIO: g_value_set_boolean (value, v4l2object->keep_aspect); break; default: return FALSE; break; } return TRUE; } static void gst_v4l2_set_defaults (GstV4l2Object * v4l2object) { GstTunerNorm *norm = NULL; GstTunerChannel *channel = NULL; GstTuner *tuner; if (!GST_IS_TUNER (v4l2object->element)) return; tuner = GST_TUNER (v4l2object->element); if (v4l2object->tv_norm) norm = gst_v4l2_tuner_get_norm_by_std_id (v4l2object, v4l2object->tv_norm); GST_DEBUG_OBJECT (v4l2object->element, "tv_norm=0x%" G_GINT64_MODIFIER "x, " "norm=%p", (guint64) v4l2object->tv_norm, norm); if (norm) { gst_tuner_set_norm (tuner, norm); } else { norm = GST_TUNER_NORM (gst_tuner_get_norm (GST_TUNER (v4l2object->element))); if (norm) { v4l2object->tv_norm = gst_v4l2_tuner_get_std_id_by_norm (v4l2object, norm); gst_tuner_norm_changed (tuner, norm); } } if (v4l2object->channel) channel = gst_tuner_find_channel_by_name (tuner, v4l2object->channel); if (channel) { gst_tuner_set_channel (tuner, channel); } else { channel = GST_TUNER_CHANNEL (gst_tuner_get_channel (GST_TUNER (v4l2object->element))); if (channel) { g_free (v4l2object->channel); v4l2object->channel = g_strdup (channel->label); gst_tuner_channel_changed (tuner, channel); } } if (channel && GST_TUNER_CHANNEL_HAS_FLAG (channel, GST_TUNER_CHANNEL_FREQUENCY)) { if (v4l2object->frequency != 0) { gst_tuner_set_frequency (tuner, channel, v4l2object->frequency); } else { v4l2object->frequency = gst_tuner_get_frequency (tuner, channel); if (v4l2object->frequency == 0) { /* guess */ gst_tuner_set_frequency (tuner, channel, 1000); } else { } } } } gboolean gst_v4l2_object_open (GstV4l2Object * v4l2object) { if (gst_v4l2_open (v4l2object)) gst_v4l2_set_defaults (v4l2object); else return FALSE; return TRUE; } gboolean gst_v4l2_object_open_shared (GstV4l2Object * v4l2object, GstV4l2Object * other) { gboolean ret; ret = gst_v4l2_dup (v4l2object, other); return ret; } gboolean gst_v4l2_object_close (GstV4l2Object * v4l2object) { if (!gst_v4l2_close (v4l2object)) return FALSE; gst_caps_replace (&v4l2object->probed_caps, NULL); if (v4l2object->formats) { gst_v4l2_object_clear_format_list (v4l2object); } return TRUE; } static struct v4l2_fmtdesc * gst_v4l2_object_get_format_from_fourcc (GstV4l2Object * v4l2object, guint32 fourcc) { struct v4l2_fmtdesc *fmt; GSList *walk; if (fourcc == 0) return NULL; walk = gst_v4l2_object_get_format_list (v4l2object); while (walk) { fmt = (struct v4l2_fmtdesc *) walk->data; if (fmt->pixelformat == fourcc) return fmt; /* special case for jpeg */ if (fmt->pixelformat == V4L2_PIX_FMT_MJPEG || fmt->pixelformat == V4L2_PIX_FMT_JPEG || fmt->pixelformat == V4L2_PIX_FMT_PJPG) { if (fourcc == V4L2_PIX_FMT_JPEG || fourcc == V4L2_PIX_FMT_MJPEG || fourcc == V4L2_PIX_FMT_PJPG) { return fmt; } } walk = g_slist_next (walk); } return NULL; } /* complete made up ranking, the values themselves are meaningless */ /* These ranks MUST be X such that X<<15 fits on a signed int - see the comment at the end of gst_v4l2_object_format_get_rank. */ #define YUV_BASE_RANK 1000 #define JPEG_BASE_RANK 500 #define DV_BASE_RANK 200 #define RGB_BASE_RANK 100 #define YUV_ODD_BASE_RANK 50 #define RGB_ODD_BASE_RANK 25 #define BAYER_BASE_RANK 15 #define S910_BASE_RANK 10 #define GREY_BASE_RANK 5 #define PWC_BASE_RANK 1 static gint gst_v4l2_object_format_get_rank (const struct v4l2_fmtdesc *fmt) { guint32 fourcc = fmt->pixelformat; gboolean emulated = ((fmt->flags & V4L2_FMT_FLAG_EMULATED) != 0); gint rank = 0; switch (fourcc) { case V4L2_PIX_FMT_MJPEG: case V4L2_PIX_FMT_PJPG: rank = JPEG_BASE_RANK; break; case V4L2_PIX_FMT_JPEG: rank = JPEG_BASE_RANK + 1; break; case V4L2_PIX_FMT_MPEG: /* MPEG */ rank = JPEG_BASE_RANK + 2; break; case V4L2_PIX_FMT_RGB332: case V4L2_PIX_FMT_RGB555: case V4L2_PIX_FMT_RGB555X: case V4L2_PIX_FMT_RGB565: case V4L2_PIX_FMT_RGB565X: rank = RGB_ODD_BASE_RANK; break; case V4L2_PIX_FMT_RGB24: case V4L2_PIX_FMT_BGR24: rank = RGB_BASE_RANK - 1; break; case V4L2_PIX_FMT_RGB32: case V4L2_PIX_FMT_BGR32: rank = RGB_BASE_RANK; break; case V4L2_PIX_FMT_GREY: /* 8 Greyscale */ rank = GREY_BASE_RANK; break; case V4L2_PIX_FMT_NV12: /* 12 Y/CbCr 4:2:0 */ case V4L2_PIX_FMT_NV12M: /* Same as NV12 */ case V4L2_PIX_FMT_NV12MT: /* NV12 64x32 tile */ case V4L2_PIX_FMT_NV21: /* 12 Y/CrCb 4:2:0 */ case V4L2_PIX_FMT_NV21M: /* Same as NV21 */ case V4L2_PIX_FMT_YYUV: /* 16 YUV 4:2:2 */ case V4L2_PIX_FMT_HI240: /* 8 8-bit color */ rank = YUV_ODD_BASE_RANK; break; case V4L2_PIX_FMT_YVU410: /* YVU9, 9 bits per pixel */ rank = YUV_BASE_RANK + 3; break; case V4L2_PIX_FMT_YUV410: /* YUV9, 9 bits per pixel */ rank = YUV_BASE_RANK + 2; break; case V4L2_PIX_FMT_YUV420: /* I420, 12 bits per pixel */ rank = YUV_BASE_RANK + 7; break; case V4L2_PIX_FMT_YUYV: /* YUY2, 16 bits per pixel */ rank = YUV_BASE_RANK + 10; break; case V4L2_PIX_FMT_YVU420: /* YV12, 12 bits per pixel */ rank = YUV_BASE_RANK + 6; break; case V4L2_PIX_FMT_UYVY: /* UYVY, 16 bits per pixel */ rank = YUV_BASE_RANK + 9; break; case V4L2_PIX_FMT_Y41P: /* Y41P, 12 bits per pixel */ rank = YUV_BASE_RANK + 5; break; case V4L2_PIX_FMT_YUV411P: /* Y41B, 12 bits per pixel */ rank = YUV_BASE_RANK + 4; break; case V4L2_PIX_FMT_YUV422P: /* Y42B, 16 bits per pixel */ rank = YUV_BASE_RANK + 8; break; case V4L2_PIX_FMT_DV: rank = DV_BASE_RANK; break; case V4L2_PIX_FMT_WNVA: /* Winnov hw compres */ rank = 0; break; case V4L2_PIX_FMT_SBGGR8: rank = BAYER_BASE_RANK; break; case V4L2_PIX_FMT_SN9C10X: rank = S910_BASE_RANK; break; case V4L2_PIX_FMT_PWC1: rank = PWC_BASE_RANK; break; case V4L2_PIX_FMT_PWC2: rank = PWC_BASE_RANK; break; default: rank = 0; break; } /* All ranks are below 1<<15 so a shift by 15 * will a) make all non-emulated formats larger * than emulated and b) will not overflow */ if (!emulated) rank <<= 15; return rank; } static gint format_cmp_func (gconstpointer a, gconstpointer b) { const struct v4l2_fmtdesc *fa = a; const struct v4l2_fmtdesc *fb = b; if (fa->pixelformat == fb->pixelformat) return 0; return gst_v4l2_object_format_get_rank (fb) - gst_v4l2_object_format_get_rank (fa); } /****************************************************** * gst_v4l2_object_fill_format_list(): * create list of supported capture formats * return value: TRUE on success, FALSE on error ******************************************************/ static gboolean gst_v4l2_object_fill_format_list (GstV4l2Object * v4l2object, enum v4l2_buf_type type) { gint n; struct v4l2_fmtdesc *format; GST_DEBUG_OBJECT (v4l2object->element, "getting src format enumerations"); /* format enumeration */ for (n = 0;; n++) { format = g_new0 (struct v4l2_fmtdesc, 1); format->index = n; format->type = type; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_ENUM_FMT, format) < 0) { if (errno == EINVAL) { g_free (format); break; /* end of enumeration */ } else { goto failed; } } GST_LOG_OBJECT (v4l2object->element, "index: %u", format->index); GST_LOG_OBJECT (v4l2object->element, "type: %d", format->type); GST_LOG_OBJECT (v4l2object->element, "flags: %08x", format->flags); GST_LOG_OBJECT (v4l2object->element, "description: '%s'", format->description); GST_LOG_OBJECT (v4l2object->element, "pixelformat: %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (format->pixelformat)); /* sort formats according to our preference; we do this, because caps * are probed in the order the formats are in the list, and the order of * formats in the final probed caps matters for things like fixation */ v4l2object->formats = g_slist_insert_sorted (v4l2object->formats, format, (GCompareFunc) format_cmp_func); } #ifndef GST_DISABLE_GST_DEBUG { GSList *l; GST_INFO_OBJECT (v4l2object->element, "got %d format(s):", n); for (l = v4l2object->formats; l != NULL; l = l->next) { format = l->data; GST_INFO_OBJECT (v4l2object->element, " %" GST_FOURCC_FORMAT "%s", GST_FOURCC_ARGS (format->pixelformat), ((format->flags & V4L2_FMT_FLAG_EMULATED)) ? " (emulated)" : ""); } } #endif return TRUE; /* ERRORS */ failed: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Failed to enumerate possible video formats device '%s' can work with"), v4l2object->videodev), ("Failed to get number %d in pixelformat enumeration for %s. (%d - %s)", n, v4l2object->videodev, errno, g_strerror (errno))); g_free (format); return FALSE; } } /* * Get the list of supported capture formats, a list of * struct v4l2_fmtdesc. */ static GSList * gst_v4l2_object_get_format_list (GstV4l2Object * v4l2object) { if (!v4l2object->formats) { /* check usual way */ gst_v4l2_object_fill_format_list (v4l2object, v4l2object->type); /* if our driver supports multi-planar * and if formats are still empty then we can workaround driver bug * by also looking up formats as if our device was not supporting * multiplanar */ if (!v4l2object->formats) { switch (v4l2object->type) { case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE: gst_v4l2_object_fill_format_list (v4l2object, V4L2_BUF_TYPE_VIDEO_CAPTURE); break; case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE: gst_v4l2_object_fill_format_list (v4l2object, V4L2_BUF_TYPE_VIDEO_OUTPUT); break; default: break; } } } return v4l2object->formats; } static GstVideoFormat gst_v4l2_object_v4l2fourcc_to_video_format (guint32 fourcc) { GstVideoFormat format; switch (fourcc) { case V4L2_PIX_FMT_GREY: /* 8 Greyscale */ format = GST_VIDEO_FORMAT_GRAY8; break; case V4L2_PIX_FMT_RGB555: format = GST_VIDEO_FORMAT_RGB15; break; case V4L2_PIX_FMT_RGB565: format = GST_VIDEO_FORMAT_RGB16; break; case V4L2_PIX_FMT_RGB24: format = GST_VIDEO_FORMAT_RGB; break; case V4L2_PIX_FMT_BGR24: format = GST_VIDEO_FORMAT_BGR; break; case V4L2_PIX_FMT_RGB32: format = GST_VIDEO_FORMAT_xRGB; break; case V4L2_PIX_FMT_BGR32: format = GST_VIDEO_FORMAT_BGRx; break; case V4L2_PIX_FMT_NV12: case V4L2_PIX_FMT_NV12M: format = GST_VIDEO_FORMAT_NV12; break; case V4L2_PIX_FMT_NV12MT: format = GST_VIDEO_FORMAT_NV12_64Z32; break; case V4L2_PIX_FMT_NV21: case V4L2_PIX_FMT_NV21M: format = GST_VIDEO_FORMAT_NV21; break; case V4L2_PIX_FMT_YVU410: format = GST_VIDEO_FORMAT_YVU9; break; case V4L2_PIX_FMT_YUV410: format = GST_VIDEO_FORMAT_YUV9; break; case V4L2_PIX_FMT_YUV420: format = GST_VIDEO_FORMAT_I420; break; case V4L2_PIX_FMT_YUYV: format = GST_VIDEO_FORMAT_YUY2; break; case V4L2_PIX_FMT_YVU420: format = GST_VIDEO_FORMAT_YV12; break; case V4L2_PIX_FMT_UYVY: format = GST_VIDEO_FORMAT_UYVY; break; #if 0 case V4L2_PIX_FMT_Y41P: format = GST_VIDEO_FORMAT_Y41P; break; #endif case V4L2_PIX_FMT_YUV411P: format = GST_VIDEO_FORMAT_Y41B; break; case V4L2_PIX_FMT_YUV422P: format = GST_VIDEO_FORMAT_Y42B; break; case V4L2_PIX_FMT_YVYU: format = GST_VIDEO_FORMAT_YVYU; break; default: format = GST_VIDEO_FORMAT_UNKNOWN; break; } return format; } static GstStructure * gst_v4l2_object_v4l2fourcc_to_bare_struct (guint32 fourcc) { GstStructure *structure = NULL; switch (fourcc) { case V4L2_PIX_FMT_MJPEG: /* Motion-JPEG */ case V4L2_PIX_FMT_PJPG: /* Progressive-JPEG */ case V4L2_PIX_FMT_JPEG: /* JFIF JPEG */ structure = gst_structure_new_empty ("image/jpeg"); break; case V4L2_PIX_FMT_YYUV: /* 16 YUV 4:2:2 */ case V4L2_PIX_FMT_HI240: /* 8 8-bit color */ /* FIXME: get correct fourccs here */ break; case V4L2_PIX_FMT_MPEG1: structure = gst_structure_new ("video/mpeg", "mpegversion", G_TYPE_INT, 2, NULL); break; case V4L2_PIX_FMT_MPEG2: structure = gst_structure_new ("video/mpeg", "mpegversion", G_TYPE_INT, 2, NULL); break; case V4L2_PIX_FMT_MPEG4: structure = gst_structure_new ("video/mpeg", "mpegversion", G_TYPE_INT, 4, "systemstream", G_TYPE_BOOLEAN, FALSE, NULL); break; case V4L2_PIX_FMT_H263: structure = gst_structure_new ("video/x-h263", "variant", G_TYPE_STRING, "itu", NULL); break; case V4L2_PIX_FMT_H264: /* H.264 */ structure = gst_structure_new ("video/x-h264", "stream-format", G_TYPE_STRING, "byte-stream", "alignment", G_TYPE_STRING, "au", NULL); break; case V4L2_PIX_FMT_VP8: structure = gst_structure_new_empty ("video/x-vp8"); break; case V4L2_PIX_FMT_RGB332: case V4L2_PIX_FMT_RGB555X: case V4L2_PIX_FMT_RGB565X: /* FIXME: get correct fourccs here */ break; case V4L2_PIX_FMT_GREY: /* 8 Greyscale */ case V4L2_PIX_FMT_RGB555: case V4L2_PIX_FMT_RGB565: case V4L2_PIX_FMT_RGB24: case V4L2_PIX_FMT_BGR24: case V4L2_PIX_FMT_RGB32: case V4L2_PIX_FMT_BGR32: case V4L2_PIX_FMT_NV12: /* 12 Y/CbCr 4:2:0 */ case V4L2_PIX_FMT_NV12M: case V4L2_PIX_FMT_NV12MT: case V4L2_PIX_FMT_NV21: /* 12 Y/CrCb 4:2:0 */ case V4L2_PIX_FMT_NV21M: case V4L2_PIX_FMT_YVU410: case V4L2_PIX_FMT_YUV410: case V4L2_PIX_FMT_YUV420: /* I420/IYUV */ case V4L2_PIX_FMT_YUYV: case V4L2_PIX_FMT_YVU420: case V4L2_PIX_FMT_UYVY: #if 0 case V4L2_PIX_FMT_Y41P: #endif case V4L2_PIX_FMT_YUV422P: case V4L2_PIX_FMT_YVYU: case V4L2_PIX_FMT_YUV411P:{ GstVideoFormat format; format = gst_v4l2_object_v4l2fourcc_to_video_format (fourcc); if (format != GST_VIDEO_FORMAT_UNKNOWN) structure = gst_structure_new ("video/x-raw", "format", G_TYPE_STRING, gst_video_format_to_string (format), NULL); break; } case V4L2_PIX_FMT_DV: structure = gst_structure_new ("video/x-dv", "systemstream", G_TYPE_BOOLEAN, TRUE, NULL); break; case V4L2_PIX_FMT_MPEG: /* MPEG */ structure = gst_structure_new ("video/mpegts", "systemstream", G_TYPE_BOOLEAN, TRUE, NULL); break; case V4L2_PIX_FMT_WNVA: /* Winnov hw compres */ break; case V4L2_PIX_FMT_SBGGR8: structure = gst_structure_new_empty ("video/x-bayer"); break; case V4L2_PIX_FMT_SN9C10X: structure = gst_structure_new_empty ("video/x-sonix"); break; case V4L2_PIX_FMT_PWC1: structure = gst_structure_new_empty ("video/x-pwc1"); break; case V4L2_PIX_FMT_PWC2: structure = gst_structure_new_empty ("video/x-pwc2"); break; default: GST_DEBUG ("Unknown fourcc 0x%08x %" GST_FOURCC_FORMAT, fourcc, GST_FOURCC_ARGS (fourcc)); break; } return structure; } GstStructure * gst_v4l2_object_v4l2fourcc_to_structure (guint32 fourcc) { GstStructure *template; gint i; template = gst_v4l2_object_v4l2fourcc_to_bare_struct (fourcc); if (template == NULL) goto done; for (i = 0; i < GST_V4L2_FORMAT_COUNT; i++) { if (gst_v4l2_formats[i].format != fourcc) continue; if (gst_v4l2_formats[i].dimensions) { gst_structure_set (template, "width", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE, "height", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL); } break; } done: return template; } static GstCaps * gst_v4l2_object_get_caps_helper (GstV4L2FormatFlags flags) { GstStructure *structure; GstCaps *caps; guint i; caps = gst_caps_new_empty (); for (i = 0; i < GST_V4L2_FORMAT_COUNT; i++) { if ((gst_v4l2_formats[i].flags & flags) == 0) continue; structure = gst_v4l2_object_v4l2fourcc_to_bare_struct (gst_v4l2_formats[i].format); if (structure) { GstStructure *alt_s = NULL; if (gst_v4l2_formats[i].dimensions) { gst_structure_set (structure, "width", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE, "height", GST_TYPE_INT_RANGE, 1, GST_V4L2_MAX_SIZE, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL); } switch (gst_v4l2_formats[i].format) { case V4L2_PIX_FMT_RGB32: alt_s = gst_structure_copy (structure); gst_structure_set (alt_s, "format", G_TYPE_STRING, "ARGB", NULL); break; case V4L2_PIX_FMT_BGR32: alt_s = gst_structure_copy (structure); gst_structure_set (alt_s, "format", G_TYPE_STRING, "BGRA", NULL); default: break; } gst_caps_append_structure (caps, structure); if (alt_s) gst_caps_append_structure (caps, alt_s); } } return gst_caps_simplify (caps); } GstCaps * gst_v4l2_object_get_all_caps (void) { static GstCaps *caps = NULL; if (caps == NULL) caps = gst_v4l2_object_get_caps_helper (GST_V4L2_ALL); return gst_caps_ref (caps); } GstCaps * gst_v4l2_object_get_raw_caps (void) { static GstCaps *caps = NULL; if (caps == NULL) caps = gst_v4l2_object_get_caps_helper (GST_V4L2_RAW); return gst_caps_ref (caps); } GstCaps * gst_v4l2_object_get_codec_caps (void) { static GstCaps *caps = NULL; if (caps == NULL) caps = gst_v4l2_object_get_caps_helper (GST_V4L2_CODEC); return gst_caps_ref (caps); } /* collect data for the given caps * @caps: given input caps * @format: location for the v4l format * @w/@h: location for width and height * @fps_n/@fps_d: location for framerate * @size: location for expected size of the frame or 0 if unknown */ static gboolean gst_v4l2_object_get_caps_info (GstV4l2Object * v4l2object, GstCaps * caps, struct v4l2_fmtdesc **format, GstVideoInfo * info) { GstStructure *structure; guint32 fourcc = 0, fourcc_nc = 0; const gchar *mimetype; struct v4l2_fmtdesc *fmt = NULL; structure = gst_caps_get_structure (caps, 0); mimetype = gst_structure_get_name (structure); if (!gst_video_info_from_caps (info, caps)) goto invalid_format; if (g_str_equal (mimetype, "video/x-raw")) { switch (GST_VIDEO_INFO_FORMAT (info)) { case GST_VIDEO_FORMAT_I420: fourcc = V4L2_PIX_FMT_YUV420; break; case GST_VIDEO_FORMAT_YUY2: fourcc = V4L2_PIX_FMT_YUYV; break; #if 0 case GST_VIDEO_FORMAT_Y41P: fourcc = V4L2_PIX_FMT_Y41P; break; #endif case GST_VIDEO_FORMAT_UYVY: fourcc = V4L2_PIX_FMT_UYVY; break; case GST_VIDEO_FORMAT_YV12: fourcc = V4L2_PIX_FMT_YVU420; break; case GST_VIDEO_FORMAT_Y41B: fourcc = V4L2_PIX_FMT_YUV411P; break; case GST_VIDEO_FORMAT_Y42B: fourcc = V4L2_PIX_FMT_YUV422P; break; case GST_VIDEO_FORMAT_NV12: fourcc = V4L2_PIX_FMT_NV12; fourcc_nc = V4L2_PIX_FMT_NV12M; break; case GST_VIDEO_FORMAT_NV12_64Z32: fourcc_nc = V4L2_PIX_FMT_NV12MT; break; case GST_VIDEO_FORMAT_NV21: fourcc = V4L2_PIX_FMT_NV21; fourcc_nc = V4L2_PIX_FMT_NV21M; break; case GST_VIDEO_FORMAT_YVYU: fourcc = V4L2_PIX_FMT_YVYU; break; case GST_VIDEO_FORMAT_RGB15: fourcc = V4L2_PIX_FMT_RGB555; break; case GST_VIDEO_FORMAT_RGB16: fourcc = V4L2_PIX_FMT_RGB565; break; case GST_VIDEO_FORMAT_RGB: fourcc = V4L2_PIX_FMT_RGB24; break; case GST_VIDEO_FORMAT_BGR: fourcc = V4L2_PIX_FMT_BGR24; break; case GST_VIDEO_FORMAT_xRGB: case GST_VIDEO_FORMAT_ARGB: fourcc = V4L2_PIX_FMT_RGB32; break; case GST_VIDEO_FORMAT_BGRx: case GST_VIDEO_FORMAT_BGRA: fourcc = V4L2_PIX_FMT_BGR32; break; case GST_VIDEO_FORMAT_GRAY8: fourcc = V4L2_PIX_FMT_GREY; default: break; } } else { if (g_str_equal (mimetype, "video/mpegts")) { fourcc = V4L2_PIX_FMT_MPEG; } else if (g_str_equal (mimetype, "video/x-dv")) { fourcc = V4L2_PIX_FMT_DV; } else if (g_str_equal (mimetype, "image/jpeg")) { fourcc = V4L2_PIX_FMT_JPEG; } else if (g_str_equal (mimetype, "video/mpeg")) { gint version; if (gst_structure_get_int (structure, "mpegversion", &version)) { switch (version) { case 1: fourcc = V4L2_PIX_FMT_MPEG1; break; case 2: fourcc = V4L2_PIX_FMT_MPEG2; break; case 4: fourcc = V4L2_PIX_FMT_MPEG4; break; default: break; } } } else if (g_str_equal (mimetype, "video/x-h263")) { fourcc = V4L2_PIX_FMT_H263; } else if (g_str_equal (mimetype, "video/x-h264")) { fourcc = V4L2_PIX_FMT_H264; } else if (g_str_equal (mimetype, "video/x-vp8")) { fourcc = V4L2_PIX_FMT_VP8; } else if (g_str_equal (mimetype, "video/x-bayer")) { fourcc = V4L2_PIX_FMT_SBGGR8; } else if (g_str_equal (mimetype, "video/x-sonix")) { fourcc = V4L2_PIX_FMT_SN9C10X; } else if (g_str_equal (mimetype, "video/x-pwc1")) { fourcc = V4L2_PIX_FMT_PWC1; } else if (g_str_equal (mimetype, "video/x-pwc2")) { fourcc = V4L2_PIX_FMT_PWC2; } } /* Prefer the non-contiguous if supported */ v4l2object->prefered_non_contiguous = TRUE; if (fourcc_nc) fmt = gst_v4l2_object_get_format_from_fourcc (v4l2object, fourcc_nc); else if (fourcc == 0) goto unhandled_format; if (fmt == NULL) { fmt = gst_v4l2_object_get_format_from_fourcc (v4l2object, fourcc); v4l2object->prefered_non_contiguous = FALSE; } if (fmt == NULL) goto unsupported_format; *format = fmt; return TRUE; /* ERRORS */ invalid_format: { GST_DEBUG_OBJECT (v4l2object, "invalid format"); return FALSE; } unhandled_format: { GST_DEBUG_OBJECT (v4l2object, "unhandled format"); return FALSE; } unsupported_format: { GST_DEBUG_OBJECT (v4l2object, "unsupported format"); return FALSE; } } static gboolean gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object, guint32 pixelformat, gint * width, gint * height); static void gst_v4l2_object_add_aspect_ratio (GstV4l2Object * v4l2object, GstStructure * s) { struct v4l2_cropcap cropcap; int num = 1, den = 1; if (!v4l2object->keep_aspect) return; if (v4l2object->par) { num = gst_value_get_fraction_numerator (v4l2object->par); den = gst_value_get_fraction_denominator (v4l2object->par); goto done; } memset (&cropcap, 0, sizeof (cropcap)); cropcap.type = v4l2object->type; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_CROPCAP, &cropcap) < 0) goto cropcap_failed; num = cropcap.pixelaspect.numerator; den = cropcap.pixelaspect.denominator; /* Ignore PAR that are 0/0 */ if (den == 0) return; done: gst_structure_set (s, "pixel-aspect-ratio", GST_TYPE_FRACTION, num, den, NULL); return; cropcap_failed: if (errno != ENOTTY) GST_WARNING_OBJECT (v4l2object->element, "Failed to probe pixel aspect ratio with VIDIOC_CROPCAP: %s", g_strerror (errno)); goto done; } /* returns TRUE if the value was changed in place, otherwise FALSE */ static gboolean gst_v4l2src_value_simplify (GValue * val) { /* simplify list of one value to one value */ if (GST_VALUE_HOLDS_LIST (val) && gst_value_list_get_size (val) == 1) { const GValue *list_val; GValue new_val = G_VALUE_INIT; list_val = gst_value_list_get_value (val, 0); g_value_init (&new_val, G_VALUE_TYPE (list_val)); g_value_copy (list_val, &new_val); g_value_unset (val); *val = new_val; return TRUE; } return FALSE; } static gboolean gst_v4l2_object_get_interlace_mode (enum v4l2_field field, GstVideoInterlaceMode * interlace_mode) { /* NB: If you add new return values, please fix mode_strings in * gst_v4l2_object_add_interlace_mode */ switch (field) { case V4L2_FIELD_ANY: GST_ERROR ("Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git\n"); /* fallthrough */ case V4L2_FIELD_NONE: *interlace_mode = GST_VIDEO_INTERLACE_MODE_PROGRESSIVE; return TRUE; case V4L2_FIELD_INTERLACED: case V4L2_FIELD_INTERLACED_TB: case V4L2_FIELD_INTERLACED_BT: *interlace_mode = GST_VIDEO_INTERLACE_MODE_INTERLEAVED; return TRUE; default: GST_ERROR ("Unknown enum v4l2_field %d", field); return FALSE; } } static int gst_v4l2_object_try_fmt (GstV4l2Object * v4l2object, struct v4l2_format *try_fmt) { int fd = v4l2object->video_fd; struct v4l2_format fmt; int r; memcpy (&fmt, try_fmt, sizeof (fmt)); r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt); if (r < 0 && errno == ENOTTY) { /* The driver might not implement TRY_FMT, in which case we will try S_FMT to probe */ if (GST_V4L2_IS_ACTIVE (v4l2object)) goto error; memcpy (&fmt, try_fmt, sizeof (fmt)); r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt); } memcpy (try_fmt, &fmt, sizeof (fmt)); return r; error: memcpy (try_fmt, &fmt, sizeof (fmt)); GST_WARNING_OBJECT (v4l2object->element, "Unable to try format: %s", g_strerror (errno)); return r; } static void gst_v4l2_object_add_interlace_mode (GstV4l2Object * v4l2object, GstStructure * s, guint32 width, guint32 height, guint32 pixelformat) { struct v4l2_format fmt; GValue interlace_formats = { 0, }; GstVideoInterlaceMode interlace_mode; const gchar *mode_strings[] = { "progressive", "interleaved", "mixed" }; if (!g_str_equal (gst_structure_get_name (s), "video/x-raw")) return; if (v4l2object->never_interlaced) { gst_structure_set (s, "interlace-mode", G_TYPE_STRING, "progressive", NULL); return; } g_value_init (&interlace_formats, GST_TYPE_LIST); /* Try twice - once for NONE, once for INTERLACED. */ memset (&fmt, 0, sizeof (fmt)); fmt.type = v4l2object->type; fmt.fmt.pix.width = width; fmt.fmt.pix.height = height; fmt.fmt.pix.pixelformat = pixelformat; fmt.fmt.pix.field = V4L2_FIELD_NONE; if (gst_v4l2_object_try_fmt (v4l2object, &fmt) == 0 && gst_v4l2_object_get_interlace_mode (fmt.fmt.pix.field, &interlace_mode)) { GValue interlace_enum = { 0, }; g_value_init (&interlace_enum, G_TYPE_STRING); g_value_set_string (&interlace_enum, mode_strings[interlace_mode]); gst_value_list_append_and_take_value (&interlace_formats, &interlace_enum); } memset (&fmt, 0, sizeof (fmt)); fmt.type = v4l2object->type; fmt.fmt.pix.width = width; fmt.fmt.pix.height = height; fmt.fmt.pix.pixelformat = pixelformat; fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; if (gst_v4l2_object_try_fmt (v4l2object, &fmt) == 0 && gst_v4l2_object_get_interlace_mode (fmt.fmt.pix.field, &interlace_mode)) { GValue interlace_enum = { 0, }; g_value_init (&interlace_enum, G_TYPE_STRING); g_value_set_string (&interlace_enum, mode_strings[interlace_mode]); gst_value_list_append_and_take_value (&interlace_formats, &interlace_enum); } gst_v4l2src_value_simplify (&interlace_formats); gst_structure_take_value (s, "interlace-mode", &interlace_formats); return; } /* The frame interval enumeration code first appeared in Linux 2.6.19. */ static GstStructure * gst_v4l2_object_probe_caps_for_format_and_size (GstV4l2Object * v4l2object, guint32 pixelformat, guint32 width, guint32 height, const GstStructure * template) { gint fd = v4l2object->video_fd; struct v4l2_frmivalenum ival; guint32 num, denom; GstStructure *s; GValue rates = { 0, }; memset (&ival, 0, sizeof (struct v4l2_frmivalenum)); ival.index = 0; ival.pixel_format = pixelformat; ival.width = width; ival.height = height; GST_LOG_OBJECT (v4l2object->element, "get frame interval for %ux%u, %" GST_FOURCC_FORMAT, width, height, GST_FOURCC_ARGS (pixelformat)); /* keep in mind that v4l2 gives us frame intervals (durations); we invert the * fraction to get framerate */ if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) < 0) goto enum_frameintervals_failed; if (ival.type == V4L2_FRMIVAL_TYPE_DISCRETE) { GValue rate = { 0, }; g_value_init (&rates, GST_TYPE_LIST); g_value_init (&rate, GST_TYPE_FRACTION); do { num = ival.discrete.numerator; denom = ival.discrete.denominator; if (num > G_MAXINT || denom > G_MAXINT) { /* let us hope we don't get here... */ num >>= 1; denom >>= 1; } GST_LOG_OBJECT (v4l2object->element, "adding discrete framerate: %d/%d", denom, num); /* swap to get the framerate */ gst_value_set_fraction (&rate, denom, num); gst_value_list_append_value (&rates, &rate); ival.index++; } while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMEINTERVALS, &ival) >= 0); } else if (ival.type == V4L2_FRMIVAL_TYPE_STEPWISE) { GValue min = { 0, }; GValue step = { 0, }; GValue max = { 0, }; gboolean added = FALSE; guint32 minnum, mindenom; guint32 maxnum, maxdenom; g_value_init (&rates, GST_TYPE_LIST); g_value_init (&min, GST_TYPE_FRACTION); g_value_init (&step, GST_TYPE_FRACTION); g_value_init (&max, GST_TYPE_FRACTION); /* get the min */ minnum = ival.stepwise.min.numerator; mindenom = ival.stepwise.min.denominator; if (minnum > G_MAXINT || mindenom > G_MAXINT) { minnum >>= 1; mindenom >>= 1; } GST_LOG_OBJECT (v4l2object->element, "stepwise min frame interval: %d/%d", minnum, mindenom); gst_value_set_fraction (&min, minnum, mindenom); /* get the max */ maxnum = ival.stepwise.max.numerator; maxdenom = ival.stepwise.max.denominator; if (maxnum > G_MAXINT || maxdenom > G_MAXINT) { maxnum >>= 1; maxdenom >>= 1; } GST_LOG_OBJECT (v4l2object->element, "stepwise max frame interval: %d/%d", maxnum, maxdenom); gst_value_set_fraction (&max, maxnum, maxdenom); /* get the step */ num = ival.stepwise.step.numerator; denom = ival.stepwise.step.denominator; if (num > G_MAXINT || denom > G_MAXINT) { num >>= 1; denom >>= 1; } if (num == 0 || denom == 0) { /* in this case we have a wrong fraction or no step, set the step to max * so that we only add the min value in the loop below */ num = maxnum; denom = maxdenom; } /* since we only have gst_value_fraction_subtract and not add, negate the * numerator */ GST_LOG_OBJECT (v4l2object->element, "stepwise step frame interval: %d/%d", num, denom); gst_value_set_fraction (&step, -num, denom); while (gst_value_compare (&min, &max) != GST_VALUE_GREATER_THAN) { GValue rate = { 0, }; num = gst_value_get_fraction_numerator (&min); denom = gst_value_get_fraction_denominator (&min); GST_LOG_OBJECT (v4l2object->element, "adding stepwise framerate: %d/%d", denom, num); /* invert to get the framerate */ g_value_init (&rate, GST_TYPE_FRACTION); gst_value_set_fraction (&rate, denom, num); gst_value_list_append_value (&rates, &rate); added = TRUE; /* we're actually adding because step was negated above. This is because * there is no _add function... */ if (!gst_value_fraction_subtract (&min, &min, &step)) { GST_WARNING_OBJECT (v4l2object->element, "could not step fraction!"); break; } } if (!added) { /* no range was added, leave the default range from the template */ GST_WARNING_OBJECT (v4l2object->element, "no range added, leaving default"); g_value_unset (&rates); } } else if (ival.type == V4L2_FRMIVAL_TYPE_CONTINUOUS) { guint32 maxnum, maxdenom; g_value_init (&rates, GST_TYPE_FRACTION_RANGE); num = ival.stepwise.min.numerator; denom = ival.stepwise.min.denominator; if (num > G_MAXINT || denom > G_MAXINT) { num >>= 1; denom >>= 1; } maxnum = ival.stepwise.max.numerator; maxdenom = ival.stepwise.max.denominator; if (maxnum > G_MAXINT || maxdenom > G_MAXINT) { maxnum >>= 1; maxdenom >>= 1; } GST_LOG_OBJECT (v4l2object->element, "continuous frame interval %d/%d to %d/%d", maxdenom, maxnum, denom, num); gst_value_set_fraction_range_full (&rates, maxdenom, maxnum, denom, num); } else { goto unknown_type; } return_data: s = gst_structure_copy (template); gst_structure_set (s, "width", G_TYPE_INT, (gint) width, "height", G_TYPE_INT, (gint) height, NULL); gst_v4l2_object_add_aspect_ratio (v4l2object, s); gst_v4l2_object_add_interlace_mode (v4l2object, s, width, height, pixelformat); if (G_IS_VALUE (&rates)) { gst_v4l2src_value_simplify (&rates); /* only change the framerate on the template when we have a valid probed new * value */ gst_structure_take_value (s, "framerate", &rates); } else if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE || v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) { gst_structure_set (s, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL); } return s; /* ERRORS */ enum_frameintervals_failed: { GST_DEBUG_OBJECT (v4l2object->element, "Unable to enumerate intervals for %" GST_FOURCC_FORMAT "@%ux%u", GST_FOURCC_ARGS (pixelformat), width, height); goto return_data; } unknown_type: { /* I don't see how this is actually an error, we ignore the format then */ GST_WARNING_OBJECT (v4l2object->element, "Unknown frame interval type at %" GST_FOURCC_FORMAT "@%ux%u: %u", GST_FOURCC_ARGS (pixelformat), width, height, ival.type); return NULL; } } static gint sort_by_frame_size (GstStructure * s1, GstStructure * s2) { int w1, h1, w2, h2; gst_structure_get_int (s1, "width", &w1); gst_structure_get_int (s1, "height", &h1); gst_structure_get_int (s2, "width", &w2); gst_structure_get_int (s2, "height", &h2); /* I think it's safe to assume that this won't overflow for a while */ return ((w2 * h2) - (w1 * h1)); } static void gst_v4l2_object_update_and_append (GstV4l2Object * v4l2object, guint32 format, GstCaps * caps, GstStructure * s) { GstStructure *alt_s = NULL; /* Encoded stream on output buffer need to be parsed */ if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_OUTPUT || v4l2object->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) { gint i = 0; for (; i < GST_V4L2_FORMAT_COUNT; i++) { if (format == gst_v4l2_formats[i].format && gst_v4l2_formats[i].flags & GST_V4L2_CODEC && !(gst_v4l2_formats[i].flags & GST_V4L2_NO_PARSE)) { gst_structure_set (s, "parsed", G_TYPE_BOOLEAN, TRUE, NULL); break; } } } if (v4l2object->has_alpha_component && (v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE || v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)) { switch (format) { case V4L2_PIX_FMT_RGB32: alt_s = gst_structure_copy (s); gst_structure_set (alt_s, "format", G_TYPE_STRING, "ARGB", NULL); break; case V4L2_PIX_FMT_BGR32: alt_s = gst_structure_copy (s); gst_structure_set (alt_s, "format", G_TYPE_STRING, "BGRA", NULL); break; default: break; } } gst_caps_append_structure (caps, s); if (alt_s) gst_caps_append_structure (caps, alt_s); } static GstCaps * gst_v4l2_object_probe_caps_for_format (GstV4l2Object * v4l2object, guint32 pixelformat, const GstStructure * template) { GstCaps *ret = gst_caps_new_empty (); GstStructure *tmp; gint fd = v4l2object->video_fd; struct v4l2_frmsizeenum size; GList *results = NULL; guint32 w, h; if (pixelformat == GST_MAKE_FOURCC ('M', 'P', 'E', 'G')) { gst_caps_append_structure (ret, gst_structure_copy (template)); return ret; } memset (&size, 0, sizeof (struct v4l2_frmsizeenum)); size.index = 0; size.pixel_format = pixelformat; GST_DEBUG_OBJECT (v4l2object->element, "Enumerating frame sizes for %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat)); if (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) < 0) goto enum_framesizes_failed; if (size.type == V4L2_FRMSIZE_TYPE_DISCRETE) { do { GST_LOG_OBJECT (v4l2object->element, "got discrete frame size %dx%d", size.discrete.width, size.discrete.height); w = MIN (size.discrete.width, G_MAXINT); h = MIN (size.discrete.height, G_MAXINT); if (w && h) { tmp = gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat, w, h, template); if (tmp) results = g_list_prepend (results, tmp); } size.index++; } while (v4l2_ioctl (fd, VIDIOC_ENUM_FRAMESIZES, &size) >= 0); GST_DEBUG_OBJECT (v4l2object->element, "done iterating discrete frame sizes"); } else if (size.type == V4L2_FRMSIZE_TYPE_STEPWISE) { guint32 maxw, maxh, step_w, step_h; GST_DEBUG_OBJECT (v4l2object->element, "we have stepwise frame sizes:"); GST_DEBUG_OBJECT (v4l2object->element, "min width: %d", size.stepwise.min_width); GST_DEBUG_OBJECT (v4l2object->element, "min height: %d", size.stepwise.min_height); GST_DEBUG_OBJECT (v4l2object->element, "max width: %d", size.stepwise.max_width); GST_DEBUG_OBJECT (v4l2object->element, "min height: %d", size.stepwise.max_height); GST_DEBUG_OBJECT (v4l2object->element, "step width: %d", size.stepwise.step_width); GST_DEBUG_OBJECT (v4l2object->element, "step height: %d", size.stepwise.step_height); w = MAX (size.stepwise.min_width, 1); h = MAX (size.stepwise.min_height, 1); maxw = MIN (size.stepwise.max_width, G_MAXINT); maxh = MIN (size.stepwise.max_height, G_MAXINT); step_w = MAX (size.stepwise.step_width, 1); step_h = MAX (size.stepwise.step_height, 1); /* FIXME: check for sanity and that min/max are multiples of the steps */ /* we only query details for the max width/height since it's likely the * most restricted if there are any resolution-dependent restrictions */ tmp = gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat, maxw, maxh, template); if (tmp) { GValue step_range = G_VALUE_INIT; g_value_init (&step_range, GST_TYPE_INT_RANGE); gst_value_set_int_range_step (&step_range, w, maxw, step_w); gst_structure_set_value (tmp, "width", &step_range); gst_value_set_int_range_step (&step_range, h, maxh, step_h); gst_structure_take_value (tmp, "height", &step_range); /* no point using the results list here, since there's only one struct */ gst_v4l2_object_update_and_append (v4l2object, pixelformat, ret, tmp); } } else if (size.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) { guint32 maxw, maxh; GST_DEBUG_OBJECT (v4l2object->element, "we have continuous frame sizes:"); GST_DEBUG_OBJECT (v4l2object->element, "min width: %d", size.stepwise.min_width); GST_DEBUG_OBJECT (v4l2object->element, "min height: %d", size.stepwise.min_height); GST_DEBUG_OBJECT (v4l2object->element, "max width: %d", size.stepwise.max_width); GST_DEBUG_OBJECT (v4l2object->element, "min height: %d", size.stepwise.max_height); w = MAX (size.stepwise.min_width, 1); h = MAX (size.stepwise.min_height, 1); maxw = MIN (size.stepwise.max_width, G_MAXINT); maxh = MIN (size.stepwise.max_height, G_MAXINT); tmp = gst_v4l2_object_probe_caps_for_format_and_size (v4l2object, pixelformat, w, h, template); if (tmp) { gst_structure_set (tmp, "width", GST_TYPE_INT_RANGE, (gint) w, (gint) maxw, "height", GST_TYPE_INT_RANGE, (gint) h, (gint) maxh, NULL); /* no point using the results list here, since there's only one struct */ gst_v4l2_object_update_and_append (v4l2object, pixelformat, ret, tmp); } } else { goto unknown_type; } /* we use an intermediary list to store and then sort the results of the * probing because we can't make any assumptions about the order in which * the driver will give us the sizes, but we want the final caps to contain * the results starting with the highest resolution and having the lowest * resolution last, since order in caps matters for things like fixation. */ results = g_list_sort (results, (GCompareFunc) sort_by_frame_size); while (results != NULL) { gst_v4l2_object_update_and_append (v4l2object, pixelformat, ret, results->data); results = g_list_delete_link (results, results); } if (gst_caps_is_empty (ret)) goto enum_framesizes_no_results; return ret; /* ERRORS */ enum_framesizes_failed: { /* I don't see how this is actually an error */ GST_DEBUG_OBJECT (v4l2object->element, "Failed to enumerate frame sizes for pixelformat %" GST_FOURCC_FORMAT " (%s)", GST_FOURCC_ARGS (pixelformat), g_strerror (errno)); goto default_frame_sizes; } enum_framesizes_no_results: { /* it's possible that VIDIOC_ENUM_FRAMESIZES is defined but the driver in * question doesn't actually support it yet */ GST_DEBUG_OBJECT (v4l2object->element, "No results for pixelformat %" GST_FOURCC_FORMAT " enumerating frame sizes, trying fallback", GST_FOURCC_ARGS (pixelformat)); goto default_frame_sizes; } unknown_type: { GST_WARNING_OBJECT (v4l2object->element, "Unknown frame sizeenum type for pixelformat %" GST_FOURCC_FORMAT ": %u", GST_FOURCC_ARGS (pixelformat), size.type); goto default_frame_sizes; } default_frame_sizes: { gint min_w, max_w, min_h, max_h, fix_num = 0, fix_denom = 0; /* This code is for Linux < 2.6.19 */ min_w = min_h = 1; max_w = max_h = GST_V4L2_MAX_SIZE; if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat, &min_w, &min_h)) { GST_WARNING_OBJECT (v4l2object->element, "Could not probe minimum capture size for pixelformat %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat)); } if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat, &max_w, &max_h)) { GST_WARNING_OBJECT (v4l2object->element, "Could not probe maximum capture size for pixelformat %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat)); } /* Since we can't get framerate directly, try to use the current norm */ if (v4l2object->tv_norm && v4l2object->norms) { GList *norms; GstTunerNorm *norm = NULL; GstTunerNorm *current = gst_v4l2_tuner_get_norm_by_std_id (v4l2object, v4l2object->tv_norm); for (norms = v4l2object->norms; norms != NULL; norms = norms->next) { norm = (GstTunerNorm *) norms->data; if (!strcmp (norm->label, current->label)) break; } /* If it's possible, set framerate to that (discrete) value */ if (norm) { fix_num = gst_value_get_fraction_numerator (&norm->framerate); fix_denom = gst_value_get_fraction_denominator (&norm->framerate); } } tmp = gst_structure_copy (template); if (fix_num) { gst_structure_set (tmp, "framerate", GST_TYPE_FRACTION, fix_num, fix_denom, NULL); } else if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE || v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) { /* if norm can't be used, copy the template framerate */ gst_structure_set (tmp, "framerate", GST_TYPE_FRACTION_RANGE, 0, 1, 100, 1, NULL); } if (min_w == max_w) gst_structure_set (tmp, "width", G_TYPE_INT, max_w, NULL); else gst_structure_set (tmp, "width", GST_TYPE_INT_RANGE, min_w, max_w, NULL); if (min_h == max_h) gst_structure_set (tmp, "height", G_TYPE_INT, max_h, NULL); else gst_structure_set (tmp, "height", GST_TYPE_INT_RANGE, min_h, max_h, NULL); /* We could consider setting interlace mode from min and max. */ gst_v4l2_object_add_interlace_mode (v4l2object, tmp, max_w, max_h, pixelformat); gst_v4l2_object_add_aspect_ratio (v4l2object, tmp); gst_v4l2_object_update_and_append (v4l2object, pixelformat, ret, tmp); return ret; } } static gboolean gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object, guint32 pixelformat, gint * width, gint * height) { struct v4l2_format fmt; gboolean ret = FALSE; GstVideoInterlaceMode interlace_mode; g_return_val_if_fail (width != NULL, FALSE); g_return_val_if_fail (height != NULL, FALSE); GST_LOG_OBJECT (v4l2object->element, "getting nearest size to %dx%d with format %" GST_FOURCC_FORMAT, *width, *height, GST_FOURCC_ARGS (pixelformat)); memset (&fmt, 0, sizeof (struct v4l2_format)); /* get size delimiters */ memset (&fmt, 0, sizeof (fmt)); fmt.type = v4l2object->type; fmt.fmt.pix.width = *width; fmt.fmt.pix.height = *height; fmt.fmt.pix.pixelformat = pixelformat; fmt.fmt.pix.field = V4L2_FIELD_ANY; if (gst_v4l2_object_try_fmt (v4l2object, &fmt) < 0) goto error; GST_LOG_OBJECT (v4l2object->element, "got nearest size %dx%d", fmt.fmt.pix.width, fmt.fmt.pix.height); *width = fmt.fmt.pix.width; *height = fmt.fmt.pix.height; if (!gst_v4l2_object_get_interlace_mode (fmt.fmt.pix.field, &interlace_mode)) { GST_WARNING_OBJECT (v4l2object->element, "Unsupported field type for %" GST_FOURCC_FORMAT "@%ux%u: %u", GST_FOURCC_ARGS (pixelformat), *width, *height, fmt.fmt.pix.field); goto error; } ret = TRUE; error: if (!ret) { GST_WARNING_OBJECT (v4l2object->element, "Unable to try format: %s", g_strerror (errno)); } return ret; } #define GST_V4L2_OBJECT_CHECK_ALLOCATION_MODE(obj,type) \ gst_v4l2_object_check_allocation_mode ((obj), V4L2_MEMORY_ ## type, \ GST_V4L2_OBJECT_FLAG_ ## type ## _REQBUFS, \ GST_V4L2_OBJECT_FLAG_ ## type ## _CREATE_BUFS) static guint32 gst_v4l2_object_check_allocation_mode(GstV4l2Object * v4l2object, guint32 memory, guint32 breq_flag, guint32 bcreate_flag) { struct v4l2_requestbuffers breq = { 0 }; guint32 flags = 0; breq.type = v4l2object->type; breq.count = 0; breq.memory = memory; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_REQBUFS, &breq) == 0) { struct v4l2_create_buffers bcreate = { 0 }; flags |= breq_flag; bcreate.memory = V4L2_MEMORY_MMAP; bcreate.format = v4l2object->format; if ((v4l2_ioctl (v4l2object->video_fd, VIDIOC_CREATE_BUFS, &bcreate) == 0)) flags |= bcreate_flag; } return flags; } static gboolean gst_v4l2_object_setup_pool (GstV4l2Object * v4l2object, GstCaps * caps) { GstV4l2IOMode mode; guint32 flags = 0; GST_DEBUG_OBJECT (v4l2object->element, "initializing the %s system", V4L2_TYPE_IS_OUTPUT (v4l2object->type) ? "output" : "capture"); GST_V4L2_CHECK_OPEN (v4l2object); GST_V4L2_CHECK_NOT_ACTIVE (v4l2object); flags |= GST_V4L2_OBJECT_CHECK_ALLOCATION_MODE (v4l2object, MMAP); flags |= GST_V4L2_OBJECT_CHECK_ALLOCATION_MODE (v4l2object, USERPTR); flags |= GST_V4L2_OBJECT_CHECK_ALLOCATION_MODE (v4l2object, DMABUF); if (flags == 0) { /* Drivers not ported from videobuf to videbuf2 don't allow freeing buffers * using REQBUFS(0). This is a workaround to still support these drivers, * which are known to have MMAP support. */ GST_WARNING_OBJECT (v4l2object, "Could not probe supported memory type, " "assuming MMAP is supported, this is expected for older drivers not " " yet ported to videobuf2 framework"); flags = GST_V4L2_OBJECT_FLAG_MMAP_REQBUFS; } GST_OBJECT_FLAG_SET (v4l2object, flags); /* find transport */ mode = v4l2object->req_mode; if (v4l2object->vcap.capabilities & V4L2_CAP_READWRITE) { if (v4l2object->req_mode == GST_V4L2_IO_AUTO) mode = GST_V4L2_IO_RW; } else if (v4l2object->req_mode == GST_V4L2_IO_RW) goto method_not_supported; if (v4l2object->vcap.capabilities & V4L2_CAP_STREAMING) { if (v4l2object->req_mode == GST_V4L2_IO_AUTO) { if (GST_V4L2_OBJECT_CAN_REQUEST (v4l2object, DMABUF)) mode = GST_V4L2_IO_DMABUF; else mode = GST_V4L2_IO_MMAP; } } else if (v4l2object->req_mode == GST_V4L2_IO_MMAP) goto method_not_supported; /* if still no transport selected, error out */ if (mode == GST_V4L2_IO_AUTO) goto no_supported_capture_method; GST_INFO_OBJECT (v4l2object->element, "accessing buffers via mode %d", mode); v4l2object->mode = mode; /* Map the buffers */ GST_LOG_OBJECT (v4l2object->element, "initiating buffer pool"); if (!(v4l2object->pool = gst_v4l2_buffer_pool_new (v4l2object, caps))) goto buffer_pool_new_failed; GST_V4L2_SET_ACTIVE (v4l2object); return TRUE; /* ERRORS */ buffer_pool_new_failed: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ, (_("Could not map buffers from device '%s'"), v4l2object->videodev), ("Failed to create buffer pool: %s", g_strerror (errno))); return FALSE; } method_not_supported: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ, (_("The driver of device '%s' does not support the IO method %d"), v4l2object->videodev, mode), (NULL)); return FALSE; } no_supported_capture_method: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, READ, (_("The driver of device '%s' does not support any known IO " "method."), v4l2object->videodev), (NULL)); return FALSE; } } static void gst_v4l2_object_set_stride (GstVideoInfo * info, GstVideoAlignment * align, gint plane, gint stride) { const GstVideoFormatInfo *finfo = info->finfo; if (GST_VIDEO_FORMAT_INFO_IS_TILED (finfo)) { gint x_tiles, y_tiles, ws, hs, tile_height, padded_height; ws = GST_VIDEO_FORMAT_INFO_TILE_WS (finfo); hs = GST_VIDEO_FORMAT_INFO_TILE_HS (finfo); tile_height = 1 << hs; padded_height = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (finfo, plane, info->height + align->padding_top + align->padding_bottom); padded_height = GST_ROUND_UP_N (padded_height, tile_height); x_tiles = stride >> ws; y_tiles = padded_height >> hs; info->stride[plane] = GST_VIDEO_TILE_MAKE_STRIDE (x_tiles, y_tiles); } else { info->stride[plane] = stride; } } static void gst_v4l2_object_extrapolate_info (GstV4l2Object * v4l2object, GstVideoInfo * info, GstVideoAlignment * align, gint stride) { const GstVideoFormatInfo *finfo = info->finfo; gint i, estride, padded_height; gsize offs = 0; g_return_if_fail (v4l2object->n_v4l2_planes == 1); padded_height = info->height + align->padding_top + align->padding_bottom; for (i = 0; i < finfo->n_planes; i++) { switch (finfo->format) { case GST_VIDEO_FORMAT_NV12: case GST_VIDEO_FORMAT_NV12_64Z32: case GST_VIDEO_FORMAT_NV21: case GST_VIDEO_FORMAT_NV16: case GST_VIDEO_FORMAT_NV24: estride = (i == 0 ? 1 : 2) * GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (finfo, i, stride); break; default: estride = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (finfo, i, stride); break; } gst_v4l2_object_set_stride (info, align, i, estride); info->offset[i] = offs; offs += estride * GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (finfo, i, padded_height); GST_DEBUG_OBJECT (v4l2object->element, "Extrapolated for plane %d with base stride %d: " "stride %d, offset %" G_GSIZE_FORMAT, i, stride, info->stride[i], info->offset[i]); } } static void gst_v4l2_object_save_format (GstV4l2Object * v4l2object, struct v4l2_fmtdesc *fmtdesc, struct v4l2_format *format, GstVideoInfo * info, GstVideoAlignment * align) { const GstVideoFormatInfo *finfo = info->finfo; gboolean standard_stride = TRUE; gint stride, padded_width, padded_height, i; if (GST_VIDEO_INFO_FORMAT (info) == GST_VIDEO_FORMAT_ENCODED) { v4l2object->n_v4l2_planes = 1; info->size = format->fmt.pix.sizeimage; goto store_info; } /* adjust right padding */ if (V4L2_TYPE_IS_MULTIPLANAR (v4l2object->type)) stride = format->fmt.pix_mp.plane_fmt[0].bytesperline; else stride = format->fmt.pix.bytesperline; padded_width = stride / GST_VIDEO_FORMAT_INFO_PSTRIDE (finfo, 0); if (padded_width < format->fmt.pix.width) GST_WARNING_OBJECT (v4l2object->element, "Driver bug detected, stride is too small for the width"); align->padding_right = padded_width - info->width - align->padding_left; /* adjust bottom padding */ padded_height = format->fmt.pix.height; if (GST_VIDEO_FORMAT_INFO_IS_TILED (finfo)) { guint hs, tile_height; hs = GST_VIDEO_FORMAT_INFO_TILE_HS (finfo); tile_height = 1 << hs; padded_height = GST_ROUND_UP_N (padded_height, tile_height); } align->padding_bottom = padded_height - info->height - align->padding_top; /* setup the strides and offset */ if (V4L2_TYPE_IS_MULTIPLANAR (v4l2object->type)) { struct v4l2_pix_format_mplane *pix_mp = &format->fmt.pix_mp; /* figure out the frame layout */ v4l2object->n_v4l2_planes = MAX (1, pix_mp->num_planes); info->size = 0; for (i = 0; i < v4l2object->n_v4l2_planes; i++) { stride = pix_mp->plane_fmt[i].bytesperline; if (info->stride[i] != stride) standard_stride = FALSE; gst_v4l2_object_set_stride (info, align, i, stride); info->offset[i] = info->size; info->size += pix_mp->plane_fmt[i].sizeimage; } /* Extrapolate stride if planar format are being set in 1 v4l2 plane */ if (v4l2object->n_v4l2_planes < finfo->n_planes) { stride = format->fmt.pix_mp.plane_fmt[0].bytesperline; gst_v4l2_object_extrapolate_info (v4l2object, info, align, stride); } } else { /* only one plane in non-MPLANE mode */ v4l2object->n_v4l2_planes = 1; info->size = format->fmt.pix.sizeimage; stride = format->fmt.pix.bytesperline; if (info->stride[0] != stride) standard_stride = FALSE; gst_v4l2_object_extrapolate_info (v4l2object, info, align, stride); } /* adjust the offset to take into account left and top */ if (GST_VIDEO_FORMAT_INFO_IS_TILED (finfo)) { if ((align->padding_left + align->padding_top) > 0) GST_WARNING_OBJECT (v4l2object->element, "Left and top padding is not permitted for tiled formats"); } else { for (i = 0; i < finfo->n_planes; i++) { gint vedge, hedge; /* FIXME we assume plane as component as this is true for all supported * format we support. */ hedge = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (finfo, i, align->padding_left); vedge = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (finfo, i, align->padding_top); info->offset[i] += (vedge * info->stride[i]) + (hedge * GST_VIDEO_INFO_COMP_PSTRIDE (info, i)); } } store_info: GST_DEBUG_OBJECT (v4l2object->element, "Got sizeimage %" G_GSIZE_FORMAT, info->size); /* to avoid copies we need video meta if top or left padding */ v4l2object->need_video_meta = ((align->padding_top + align->padding_left) != 0); /* ... or if stride is non "standard" */ if (!standard_stride) v4l2object->need_video_meta = TRUE; /* ... or also video meta if we use multiple, non-contiguous, planes */ if (v4l2object->n_v4l2_planes > 1) v4l2object->need_video_meta = TRUE; v4l2object->info = *info; v4l2object->align = *align; v4l2object->format = *format; v4l2object->fmtdesc = fmtdesc; /* if we have a framerate pre-calculate duration */ if (info->fps_n > 0 && info->fps_d > 0) { v4l2object->duration = gst_util_uint64_scale_int (GST_SECOND, info->fps_d, info->fps_n); } else { v4l2object->duration = GST_CLOCK_TIME_NONE; } } gboolean gst_v4l2_object_set_format (GstV4l2Object * v4l2object, GstCaps * caps) { gint fd = v4l2object->video_fd; struct v4l2_format format; struct v4l2_streamparm streamparm; enum v4l2_field field; guint32 pixelformat; struct v4l2_fmtdesc *fmtdesc; GstVideoInfo info; GstVideoAlignment align; gint width, height, fps_n, fps_d; gint n_v4l_planes; gint i = 0; gboolean is_mplane, format_changed; enum v4l2_colorspace colorspace = 0; GST_V4L2_CHECK_OPEN (v4l2object); GST_V4L2_CHECK_NOT_ACTIVE (v4l2object); is_mplane = V4L2_TYPE_IS_MULTIPLANAR (v4l2object->type); gst_video_info_init (&info); gst_video_alignment_reset (&align); if (!gst_v4l2_object_get_caps_info (v4l2object, caps, &fmtdesc, &info)) goto invalid_caps; pixelformat = fmtdesc->pixelformat; width = GST_VIDEO_INFO_WIDTH (&info); height = GST_VIDEO_INFO_HEIGHT (&info); fps_n = GST_VIDEO_INFO_FPS_N (&info); fps_d = GST_VIDEO_INFO_FPS_D (&info); /* if encoded format (GST_VIDEO_INFO_N_PLANES return 0) * or if contiguous is prefered */ n_v4l_planes = GST_VIDEO_INFO_N_PLANES (&info); if (!n_v4l_planes || !v4l2object->prefered_non_contiguous) n_v4l_planes = 1; if (GST_VIDEO_INFO_IS_INTERLACED (&info)) { GST_DEBUG_OBJECT (v4l2object->element, "interlaced video"); /* ideally we would differentiate between types of interlaced video * but there is not sufficient information in the caps.. */ field = V4L2_FIELD_INTERLACED; } else { GST_DEBUG_OBJECT (v4l2object->element, "progressive video"); field = V4L2_FIELD_NONE; } if (V4L2_TYPE_IS_OUTPUT (v4l2object->type)) { /* We should set colorspace if we have it */ if (gst_video_colorimetry_matches (&info.colorimetry, "bt601")) { colorspace = V4L2_COLORSPACE_SMPTE170M; } else if (gst_video_colorimetry_matches (&info.colorimetry, "bt709")) { colorspace = V4L2_COLORSPACE_REC709; } else if (gst_video_colorimetry_matches (&info.colorimetry, "smpte240m")) { colorspace = V4L2_COLORSPACE_SMPTE240M; } else { /* Try to guess colorspace according to pixelformat and size */ if (GST_VIDEO_INFO_IS_YUV (&info)) { /* SD streams likely use SMPTE170M and HD streams REC709 */ if (width <= 720 && height <= 576) colorspace = V4L2_COLORSPACE_SMPTE170M; else colorspace = V4L2_COLORSPACE_REC709; } else if (GST_VIDEO_INFO_IS_RGB (&info)) { colorspace = V4L2_COLORSPACE_SRGB; } } } GST_DEBUG_OBJECT (v4l2object->element, "Desired format %dx%d, format " "%" GST_FOURCC_FORMAT " stride: %d", width, height, GST_FOURCC_ARGS (pixelformat), GST_VIDEO_INFO_PLANE_STRIDE (&info, 0)); memset (&format, 0x00, sizeof (struct v4l2_format)); format.type = v4l2object->type; if (v4l2object->no_initial_format) { format_changed = TRUE; } else { if (v4l2_ioctl (fd, VIDIOC_G_FMT, &format) < 0) goto get_fmt_failed; /* Note that four first fields are the same between v4l2_pix_format and * v4l2_pix_format_mplane, so we don't need to duplicate he checks */ /* If no size in caps, use configured size */ if (width == 0 && height == 0) { width = format.fmt.pix_mp.width; height = format.fmt.pix_mp.height; } format_changed = format.type != v4l2object->type || format.fmt.pix_mp.width != width || format.fmt.pix_mp.height != height || format.fmt.pix_mp.pixelformat != pixelformat || format.fmt.pix_mp.field != field; if (V4L2_TYPE_IS_OUTPUT (v4l2object->type)) { if (is_mplane) { format_changed = format_changed || format.fmt.pix_mp.colorspace != colorspace; } else { format_changed = format_changed || format.fmt.pix.colorspace != colorspace; } } } #ifndef GST_DISABLE_GST_DEBUG if (is_mplane) { GST_DEBUG_OBJECT (v4l2object->element, "Current size is %dx%d, format " "%" GST_FOURCC_FORMAT " colorspace %d, nb planes %d", format.fmt.pix_mp.width, format.fmt.pix_mp.height, GST_FOURCC_ARGS (format.fmt.pix.pixelformat), format.fmt.pix_mp.colorspace, format.fmt.pix_mp.num_planes); for (i = 0; i < format.fmt.pix_mp.num_planes; i++) GST_DEBUG_OBJECT (v4l2object->element, " stride %d", format.fmt.pix_mp.plane_fmt[i].bytesperline); } else { GST_DEBUG_OBJECT (v4l2object->element, "Current size is %dx%d, format " "%" GST_FOURCC_FORMAT " stride %d, colorspace %d", format.fmt.pix.width, format.fmt.pix.height, GST_FOURCC_ARGS (format.fmt.pix.pixelformat), format.fmt.pix.bytesperline, format.fmt.pix.colorspace); } #endif /* If nothing changed, we are done */ if (!format_changed) goto done; /* something different, set the format */ GST_DEBUG_OBJECT (v4l2object->element, "Setting format to %dx%d, format " "%" GST_FOURCC_FORMAT, width, height, GST_FOURCC_ARGS (pixelformat)); if (is_mplane) { format.type = v4l2object->type; format.fmt.pix_mp.pixelformat = pixelformat; format.fmt.pix_mp.width = width; format.fmt.pix_mp.height = height; format.fmt.pix_mp.field = field; format.fmt.pix_mp.num_planes = n_v4l_planes; /* try to ask our prefered stride but it's not a failure if not * accepted */ for (i = 0; i < n_v4l_planes; i++) { gint stride = GST_VIDEO_INFO_PLANE_STRIDE (&info, i); if (GST_VIDEO_FORMAT_INFO_IS_TILED (info.finfo)) stride = GST_VIDEO_TILE_X_TILES (stride) << GST_VIDEO_FORMAT_INFO_TILE_WS (info.finfo); format.fmt.pix_mp.plane_fmt[i].bytesperline = stride; } if (GST_VIDEO_INFO_FORMAT (&info) == GST_VIDEO_FORMAT_ENCODED) format.fmt.pix_mp.plane_fmt[0].sizeimage = ENCODED_BUFFER_SIZE; } else { gint stride = GST_VIDEO_INFO_PLANE_STRIDE (&info, 0); format.type = v4l2object->type; format.fmt.pix.width = width; format.fmt.pix.height = height; format.fmt.pix.pixelformat = pixelformat; format.fmt.pix.field = field; if (GST_VIDEO_FORMAT_INFO_IS_TILED (info.finfo)) stride = GST_VIDEO_TILE_X_TILES (stride) << GST_VIDEO_FORMAT_INFO_TILE_WS (info.finfo); /* try to ask our prefered stride */ format.fmt.pix.bytesperline = stride; if (GST_VIDEO_INFO_FORMAT (&info) == GST_VIDEO_FORMAT_ENCODED) format.fmt.pix.sizeimage = ENCODED_BUFFER_SIZE; } GST_DEBUG_OBJECT (v4l2object->element, "Desired format is %dx%d, format " "%" GST_FOURCC_FORMAT ", nb planes %d", format.fmt.pix.width, format.fmt.pix_mp.height, GST_FOURCC_ARGS (format.fmt.pix.pixelformat), is_mplane ? format.fmt.pix_mp.num_planes : 1); #ifndef GST_DISABLE_GST_DEBUG if (is_mplane) { for (i = 0; i < format.fmt.pix_mp.num_planes; i++) GST_DEBUG_OBJECT (v4l2object->element, " stride %d", format.fmt.pix_mp.plane_fmt[i].bytesperline); } else { GST_DEBUG_OBJECT (v4l2object->element, " stride %d", format.fmt.pix.bytesperline); } #endif if (V4L2_TYPE_IS_OUTPUT (v4l2object->type)) { if (is_mplane) format.fmt.pix_mp.colorspace = colorspace; else format.fmt.pix.colorspace = colorspace; GST_DEBUG_OBJECT (v4l2object->element, "Desired colorspace is %d", colorspace); } if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0) goto set_fmt_failed; GST_DEBUG_OBJECT (v4l2object->element, "Got format of %dx%d, format " "%" GST_FOURCC_FORMAT ", nb planes %d, colorspace %d", format.fmt.pix.width, format.fmt.pix_mp.height, GST_FOURCC_ARGS (format.fmt.pix.pixelformat), is_mplane ? format.fmt.pix_mp.num_planes : 1, is_mplane ? format.fmt.pix_mp.colorspace : format.fmt.pix.colorspace); #ifndef GST_DISABLE_GST_DEBUG if (is_mplane) { for (i = 0; i < format.fmt.pix_mp.num_planes; i++) GST_DEBUG_OBJECT (v4l2object->element, " stride %d, sizeimage %d", format.fmt.pix_mp.plane_fmt[i].bytesperline, format.fmt.pix_mp.plane_fmt[i].sizeimage); } else { GST_DEBUG_OBJECT (v4l2object->element, " stride %d, sizeimage %d", format.fmt.pix.bytesperline, format.fmt.pix.sizeimage); } #endif if (format.fmt.pix.pixelformat != pixelformat) goto invalid_pixelformat; /* Only negotiate size with raw data. * For some codecs the dimensions are *not* in the bitstream, IIRC VC1 * in ASF mode for example, there is also not reason for a driver to * change the size. */ if (info.finfo->format != GST_VIDEO_FORMAT_ENCODED) { /* We can crop larger images */ if (format.fmt.pix.width < width || format.fmt.pix.height < height) goto invalid_dimensions; /* Note, this will be adjusted if upstream has non-centered cropping. */ align.padding_top = 0; align.padding_bottom = format.fmt.pix.height - height; align.padding_left = 0; align.padding_right = format.fmt.pix.width - width; } if (is_mplane && format.fmt.pix_mp.num_planes != n_v4l_planes) goto invalid_planes; if (GST_VIDEO_INFO_HAS_ALPHA (&info)) { struct v4l2_control ctl = { 0, }; ctl.id = V4L2_CID_ALPHA_COMPONENT; ctl.value = 0xff; if (v4l2_ioctl (fd, VIDIOC_S_CTRL, &ctl) < 0) GST_WARNING_OBJECT (v4l2object->element, "Failed to set alpha component value"); } /* Is there a reason we require the caller to always specify a framerate? */ GST_DEBUG_OBJECT (v4l2object->element, "Desired framerate: %u/%u", fps_n, fps_d); memset (&streamparm, 0x00, sizeof (struct v4l2_streamparm)); streamparm.type = v4l2object->type; if (v4l2_ioctl (fd, VIDIOC_G_PARM, &streamparm) < 0) goto get_parm_failed; GST_VIDEO_INFO_FPS_N (&info) = streamparm.parm.capture.timeperframe.denominator; GST_VIDEO_INFO_FPS_D (&info) = streamparm.parm.capture.timeperframe.numerator; if (v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE || v4l2object->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) { GST_DEBUG_OBJECT (v4l2object->element, "Got framerate: %u/%u", streamparm.parm.capture.timeperframe.denominator, streamparm.parm.capture.timeperframe.numerator); /* We used to skip frame rate setup if the camera was already setup * with the requested frame rate. This breaks some cameras though, * causing them to not output data (several models of Thinkpad cameras * have this problem at least). * So, don't skip. */ GST_LOG_OBJECT (v4l2object->element, "Setting framerate to %u/%u", fps_n, fps_d); /* We want to change the frame rate, so check whether we can. Some cheap USB * cameras don't have the capability */ if ((streamparm.parm.capture.capability & V4L2_CAP_TIMEPERFRAME) == 0) { GST_DEBUG_OBJECT (v4l2object->element, "Not setting framerate (not supported)"); goto done; } /* Note: V4L2 wants the frame interval, we have the frame rate */ streamparm.parm.capture.timeperframe.numerator = fps_d; streamparm.parm.capture.timeperframe.denominator = fps_n; /* some cheap USB cam's won't accept any change */ if (v4l2_ioctl (fd, VIDIOC_S_PARM, &streamparm) < 0) goto set_parm_failed; /* get new values */ fps_d = streamparm.parm.capture.timeperframe.numerator; fps_n = streamparm.parm.capture.timeperframe.denominator; GST_INFO_OBJECT (v4l2object->element, "Set framerate to %u/%u", fps_n, fps_d); GST_VIDEO_INFO_FPS_N (&info) = fps_n; GST_VIDEO_INFO_FPS_D (&info) = fps_d; } done: /* add boolean return, so we can fail on drivers bugs */ gst_v4l2_object_save_format (v4l2object, fmtdesc, &format, &info, &align); /* now configure the pool */ if (!gst_v4l2_object_setup_pool (v4l2object, caps)) goto pool_failed; return TRUE; /* ERRORS */ invalid_caps: { GST_DEBUG_OBJECT (v4l2object->element, "can't parse caps %" GST_PTR_FORMAT, caps); return FALSE; } get_fmt_failed: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Device '%s' does not support video capture"), v4l2object->videodev), ("Call to G_FMT failed: (%s)", g_strerror (errno))); return FALSE; } set_fmt_failed: { if (errno == EBUSY) { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, BUSY, (_("Device '%s' is busy"), v4l2object->videodev), ("Call to S_FMT failed for %" GST_FOURCC_FORMAT " @ %dx%d: %s", GST_FOURCC_ARGS (pixelformat), width, height, g_strerror (errno))); } else { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Device '%s' cannot capture at %dx%d"), v4l2object->videodev, width, height), ("Call to S_FMT failed for %" GST_FOURCC_FORMAT " @ %dx%d: %s", GST_FOURCC_ARGS (pixelformat), width, height, g_strerror (errno))); } return FALSE; } invalid_dimensions: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Device '%s' cannot capture at %dx%d"), v4l2object->videodev, width, height), ("Tried to capture at %dx%d, but device returned size %dx%d", width, height, format.fmt.pix.width, format.fmt.pix.height)); return FALSE; } invalid_pixelformat: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Device '%s' cannot capture in the specified format"), v4l2object->videodev), ("Tried to capture in %" GST_FOURCC_FORMAT ", but device returned format" " %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (pixelformat), GST_FOURCC_ARGS (format.fmt.pix.pixelformat))); return FALSE; } invalid_planes: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Device '%s' does support non-contiguous planes"), v4l2object->videodev), ("Device wants %d planes", format.fmt.pix_mp.num_planes)); return FALSE; } get_parm_failed: { /* it's possible that this call is not supported */ if (errno != EINVAL && errno != ENOTTY) { GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS, (_("Could not get parameters on device '%s'"), v4l2object->videodev), GST_ERROR_SYSTEM); } goto done; } set_parm_failed: { GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS, (_("Video device did not accept new frame rate setting.")), GST_ERROR_SYSTEM); goto done; } pool_failed: { /* setup_pool already send the error */ return FALSE; } } /** * gst_v4l2_object_acquire_format: * @v4l2object the object * @info a GstVideoInfo to be filled * * Acquire the driver choosen format. This is useful in decoder or encoder elements where * the output format is choosen by the HW. * * Returns: %TRUE on success, %FALSE on failure. */ gboolean gst_v4l2_object_acquire_format (GstV4l2Object * v4l2object, GstVideoInfo * info) { struct v4l2_fmtdesc *fmtdesc; struct v4l2_format fmt; struct v4l2_crop crop; GstVideoFormat format; guint width, height; GstVideoAlignment align; gst_video_info_init (info); gst_video_alignment_reset (&align); memset (&fmt, 0x00, sizeof (struct v4l2_format)); fmt.type = v4l2object->type; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_FMT, &fmt) < 0) goto get_fmt_failed; fmtdesc = gst_v4l2_object_get_format_from_fourcc (v4l2object, fmt.fmt.pix.pixelformat); if (fmtdesc == NULL) goto unsupported_format; /* No need to care about mplane, the four first params are the same */ format = gst_v4l2_object_v4l2fourcc_to_video_format (fmt.fmt.pix.pixelformat); /* fails if we do no translate the fmt.pix.pixelformat to GstVideoFormat */ if (format == GST_VIDEO_FORMAT_UNKNOWN) goto unsupported_format; if (fmt.fmt.pix.width == 0 || fmt.fmt.pix.height == 0) goto invalid_dimensions; width = fmt.fmt.pix.width; height = fmt.fmt.pix.height; memset (&crop, 0, sizeof (struct v4l2_crop)); crop.type = v4l2object->type; if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_G_CROP, &crop) >= 0) { align.padding_left = crop.c.left; align.padding_top = crop.c.top; align.padding_right = width - crop.c.width - crop.c.left; align.padding_bottom = height - crop.c.height - crop.c.top; width = crop.c.width; height = crop.c.height; } gst_video_info_set_format (info, format, width, height); switch (fmt.fmt.pix.field) { case V4L2_FIELD_ANY: case V4L2_FIELD_NONE: info->interlace_mode = GST_VIDEO_INTERLACE_MODE_PROGRESSIVE; break; case V4L2_FIELD_INTERLACED: case V4L2_FIELD_INTERLACED_TB: case V4L2_FIELD_INTERLACED_BT: info->interlace_mode = GST_VIDEO_INTERLACE_MODE_INTERLEAVED; break; default: goto unsupported_field; } gst_v4l2_object_save_format (v4l2object, fmtdesc, &fmt, info, &align); /* Shall we setup the pool ? */ return TRUE; get_fmt_failed: { GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS, (_("Video device did not provide output format.")), GST_ERROR_SYSTEM); return FALSE; } invalid_dimensions: { GST_ELEMENT_WARNING (v4l2object->element, RESOURCE, SETTINGS, (_("Video device returned invalid dimensions.")), ("Expected non 0 dimensions, got %dx%d", fmt.fmt.pix.width, fmt.fmt.pix.height)); return FALSE; } unsupported_field: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Video devices uses an unsupported interlacing method.")), ("V4L2 field type %d not supported", fmt.fmt.pix.field)); return FALSE; } unsupported_format: { GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS, (_("Video devices uses an unsupported pixel format.")), ("V4L2 format %" GST_FOURCC_FORMAT " not supported", GST_FOURCC_ARGS (fmt.fmt.pix.pixelformat))); return FALSE; } } gboolean gst_v4l2_object_set_crop (GstV4l2Object * obj) { struct v4l2_crop crop = { 0 }; crop.type = obj->type; crop.c.left = obj->align.padding_left; crop.c.top = obj->align.padding_top; crop.c.width = obj->info.width; crop.c.height = obj->info.height; if (obj->align.padding_left + obj->align.padding_top + obj->align.padding_right + obj->align.padding_bottom == 0) { GST_DEBUG_OBJECT (obj->element, "no cropping needed"); return TRUE; } GST_DEBUG_OBJECT (obj->element, "Desired cropping left %u, top %u, size %ux%u", crop.c.left, crop.c.top, crop.c.width, crop.c.height); if (v4l2_ioctl (obj->video_fd, VIDIOC_S_CROP, &crop) < 0) { GST_WARNING_OBJECT (obj->element, "VIDIOC_S_CROP failed"); return FALSE; } GST_DEBUG_OBJECT (obj->element, "Got cropping left %u, top %u, size %ux%u", crop.c.left, crop.c.top, crop.c.width, crop.c.height); return TRUE; } gboolean gst_v4l2_object_caps_equal (GstV4l2Object * v4l2object, GstCaps * caps) { GstStructure *config; GstCaps *oldcaps; gboolean ret; if (!v4l2object->pool) return FALSE; config = gst_buffer_pool_get_config (v4l2object->pool); gst_buffer_pool_config_get_params (config, &oldcaps, NULL, NULL, NULL); ret = oldcaps && gst_caps_is_equal (caps, oldcaps); gst_structure_free (config); return ret; } gboolean gst_v4l2_object_unlock (GstV4l2Object * v4l2object) { gboolean ret = TRUE; GST_LOG_OBJECT (v4l2object->element, "start flushing"); if (v4l2object->pool && gst_buffer_pool_is_active (v4l2object->pool)) gst_buffer_pool_set_flushing (v4l2object->pool, TRUE); return ret; } gboolean gst_v4l2_object_unlock_stop (GstV4l2Object * v4l2object) { gboolean ret = TRUE; GST_LOG_OBJECT (v4l2object->element, "stop flushing"); if (v4l2object->pool && gst_buffer_pool_is_active (v4l2object->pool)) gst_buffer_pool_set_flushing (v4l2object->pool, FALSE); return ret; } gboolean gst_v4l2_object_stop (GstV4l2Object * v4l2object) { GST_DEBUG_OBJECT (v4l2object->element, "stopping"); if (!GST_V4L2_IS_OPEN (v4l2object)) goto done; if (!GST_V4L2_IS_ACTIVE (v4l2object)) goto done; if (v4l2object->pool) { GST_DEBUG_OBJECT (v4l2object->element, "deactivating pool"); gst_buffer_pool_set_active (v4l2object->pool, FALSE); gst_object_unref (v4l2object->pool); v4l2object->pool = NULL; } GST_V4L2_SET_INACTIVE (v4l2object); done: return TRUE; } GstCaps * gst_v4l2_object_get_caps (GstV4l2Object * v4l2object, GstCaps * filter) { GstCaps *ret; GSList *walk; GSList *formats; if (v4l2object->probed_caps == NULL) { formats = gst_v4l2_object_get_format_list (v4l2object); ret = gst_caps_new_empty (); for (walk = formats; walk; walk = walk->next) { struct v4l2_fmtdesc *format; GstStructure *template; format = (struct v4l2_fmtdesc *) walk->data; template = gst_v4l2_object_v4l2fourcc_to_bare_struct (format->pixelformat); if (template) { GstCaps *tmp; tmp = gst_v4l2_object_probe_caps_for_format (v4l2object, format->pixelformat, template); if (tmp) gst_caps_append (ret, tmp); gst_structure_free (template); } else { GST_DEBUG_OBJECT (v4l2object->element, "unknown format %u", format->pixelformat); } } v4l2object->probed_caps = ret; } if (filter) { ret = gst_caps_intersect_full (filter, v4l2object->probed_caps, GST_CAPS_INTERSECT_FIRST); } else { ret = gst_caps_ref (v4l2object->probed_caps); } GST_INFO_OBJECT (v4l2object->element, "probed caps: %" GST_PTR_FORMAT, ret); LOG_CAPS (v4l2object->element, ret); return ret; } gboolean gst_v4l2_object_decide_allocation (GstV4l2Object * obj, GstQuery * query) { GstCaps *caps; GstBufferPool *pool = NULL, *other_pool = NULL; GstStructure *config; guint size, min, max, own_min = 0; gboolean update; gboolean has_video_meta; gboolean can_share_own_pool, pushing_from_our_pool = FALSE; struct v4l2_control ctl = { 0, }; GstAllocator *allocator = NULL; GstAllocationParams params = { 0 }; GST_DEBUG_OBJECT (obj->element, "decide allocation"); g_return_val_if_fail (obj->type == V4L2_BUF_TYPE_VIDEO_CAPTURE || obj->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE, FALSE); gst_query_parse_allocation (query, &caps, NULL); if (obj->pool == NULL) { if (!gst_v4l2_object_setup_pool (obj, caps)) goto pool_failed; } if (gst_query_get_n_allocation_params (query) > 0) gst_query_parse_nth_allocation_param (query, 0, &allocator, ¶ms); if (gst_query_get_n_allocation_pools (query) > 0) { gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max); update = TRUE; } else { pool = NULL; min = max = 0; size = 0; update = FALSE; } GST_DEBUG_OBJECT (obj->element, "allocation: size:%u min:%u max:%u pool:%" GST_PTR_FORMAT, size, min, max, pool); has_video_meta = gst_query_find_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL); can_share_own_pool = (has_video_meta || !obj->need_video_meta); /* Certain driver may expose a minimum through controls */ ctl.id = V4L2_CID_MIN_BUFFERS_FOR_CAPTURE; if (v4l2_ioctl (obj->video_fd, VIDIOC_G_CTRL, &ctl) >= 0) { GST_DEBUG_OBJECT (obj->element, "driver require a minimum of %d buffers", ctl.value); obj->min_buffers = ctl.value; } else { obj->min_buffers = 0; } /* We can't share our own pool, if it exceed V4L2 capacity */ if (min + obj->min_buffers + 1 > VIDEO_MAX_FRAME) can_share_own_pool = FALSE; /* select a pool */ switch (obj->mode) { case GST_V4L2_IO_RW: if (pool) { /* in READ/WRITE mode, prefer a downstream pool because our own pool * doesn't help much, we have to write to it as well */ GST_DEBUG_OBJECT (obj->element, "read/write mode: using downstream pool"); /* use the bigest size, when we use our own pool we can't really do any * other size than what the hardware gives us but for downstream pools * we can try */ size = MAX (size, obj->info.size); } else if (can_share_own_pool) { /* no downstream pool, use our own then */ GST_DEBUG_OBJECT (obj->element, "read/write mode: no downstream pool, using our own"); pool = gst_object_ref (obj->pool); size = obj->info.size; pushing_from_our_pool = TRUE; } break; case GST_V4L2_IO_USERPTR: case GST_V4L2_IO_DMABUF_IMPORT: /* in importing mode, prefer our own pool, and pass the other pool to * our own, so it can serve itself */ if (pool == NULL) goto no_downstream_pool; gst_v4l2_buffer_pool_set_other_pool (GST_V4L2_BUFFER_POOL (obj->pool), pool); other_pool = pool; gst_object_unref (pool); pool = gst_object_ref (obj->pool); size = obj->info.size; break; case GST_V4L2_IO_MMAP: case GST_V4L2_IO_DMABUF: /* in streaming mode, prefer our own pool */ /* Check if we can use it ... */ if (can_share_own_pool) { if (pool) gst_object_unref (pool); pool = gst_object_ref (obj->pool); size = obj->info.size; GST_DEBUG_OBJECT (obj->element, "streaming mode: using our own pool %" GST_PTR_FORMAT, pool); pushing_from_our_pool = TRUE; } else if (pool) { GST_DEBUG_OBJECT (obj->element, "streaming mode: copying to downstream pool %" GST_PTR_FORMAT, pool); } else { GST_DEBUG_OBJECT (obj->element, "streaming mode: no usable pool, copying to generic pool"); size = MAX (size, obj->info.size); } break; case GST_V4L2_IO_AUTO: default: GST_WARNING_OBJECT (obj->element, "unhandled mode"); break; } if (size == 0) goto no_size; /* If pushing from our own pool, configure it with queried minimum, * otherwise use the minimum required */ if (pushing_from_our_pool) { /* When pushing from our own pool, we need what downstream one, to be able * to fill the pipeline, the minimum required to decoder according to the * driver and 1 more, so we don't endup up with everything downstream or * held by the decoder. */ own_min = min + obj->min_buffers + 1; } else { /* In this case we'll have to configure two buffer pool. For our buffer * pool, we'll need what the driver one, and one more, so we can dequeu */ own_min = obj->min_buffers + 1; own_min = MAX (own_min, GST_V4L2_MIN_BUFFERS); /* for the downstream pool, we keep what downstream wants, though ensure * at least a minimum if downstream didn't suggest anything (we are * expecting the base class to create a default one for the context) */ min = MAX (min, GST_V4L2_MIN_BUFFERS); /* To import we need the other pool to hold at least own_min */ if (obj->pool == pool) min += own_min; } /* Request a bigger max, if one was suggested but it's too small */ if (max != 0) max = MAX (min, max); /* First step, configure our own pool */ config = gst_buffer_pool_get_config (obj->pool); if (obj->need_video_meta || has_video_meta) { GST_DEBUG_OBJECT (obj->element, "activate Video Meta"); gst_buffer_pool_config_add_option (config, GST_BUFFER_POOL_OPTION_VIDEO_META); } gst_buffer_pool_config_set_allocator (config, allocator, ¶ms); gst_buffer_pool_config_set_params (config, caps, size, own_min, 0); GST_DEBUG_OBJECT (obj->element, "setting own pool config to %" GST_PTR_FORMAT, config); /* Our pool often need to adjust the value */ if (!gst_buffer_pool_set_config (obj->pool, config)) { config = gst_buffer_pool_get_config (obj->pool); GST_DEBUG_OBJECT (obj->element, "own pool config changed to %" GST_PTR_FORMAT, config); /* our pool will adjust the maximum buffer, which we are fine with */ if (!gst_buffer_pool_set_config (obj->pool, config)) goto config_failed; } /* Now configure the other pool if different */ if (obj->pool != pool) other_pool = pool; if (other_pool) { config = gst_buffer_pool_get_config (other_pool); gst_buffer_pool_config_set_allocator (config, allocator, ¶ms); gst_buffer_pool_config_set_params (config, caps, size, min, max); GST_DEBUG_OBJECT (obj->element, "setting other pool config to %" GST_PTR_FORMAT, config); /* if downstream supports video metadata, add this to the pool config */ if (has_video_meta) { GST_DEBUG_OBJECT (obj->element, "activate Video Meta"); gst_buffer_pool_config_add_option (config, GST_BUFFER_POOL_OPTION_VIDEO_META); } if (!gst_buffer_pool_set_config (other_pool, config)) { config = gst_buffer_pool_get_config (other_pool); if (!gst_buffer_pool_config_validate_params (config, caps, size, min, max)) { gst_structure_free (config); goto config_failed; } if (!gst_buffer_pool_set_config (other_pool, config)) goto config_failed; } } if (pool) { /* For simplicity, simply read back the active configuration, so our base * class get the right information */ config = gst_buffer_pool_get_config (pool); gst_buffer_pool_config_get_params (config, NULL, &size, &min, &max); gst_structure_free (config); } if (update) gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max); else gst_query_add_allocation_pool (query, pool, size, min, max); if (allocator) gst_object_unref (allocator); if (pool) gst_object_unref (pool); return TRUE; pool_failed: { /* setup_pool already send the error */ goto cleanup; } config_failed: { GST_ELEMENT_ERROR (obj->element, RESOURCE, SETTINGS, (_("Failed to configure internal buffer pool.")), (NULL)); goto cleanup; } no_size: { GST_ELEMENT_ERROR (obj->element, RESOURCE, SETTINGS, (_("Video device did not suggest any buffer size.")), (NULL)); goto cleanup; } cleanup: { if (allocator) gst_object_unref (allocator); if (pool) gst_object_unref (pool); return FALSE; } no_downstream_pool: { GST_ELEMENT_ERROR (obj->element, RESOURCE, SETTINGS, (_("No downstream pool to import from.")), ("When importing DMABUF or USERPTR, we need a pool to import from")); return FALSE; } } gboolean gst_v4l2_object_propose_allocation (GstV4l2Object * obj, GstQuery * query) { GstBufferPool *pool; /* we need at least 2 buffers to operate */ guint size, min, max; GstCaps *caps; gboolean need_pool; struct v4l2_control ctl = { 0, }; /* Set defaults allocation parameters */ size = obj->info.size; min = GST_V4L2_MIN_BUFFERS; max = VIDEO_MAX_FRAME; gst_query_parse_allocation (query, &caps, &need_pool); if (caps == NULL) goto no_caps; if ((pool = obj->pool)) gst_object_ref (pool); if (pool != NULL) { GstCaps *pcaps; GstStructure *config; /* we had a pool, check caps */ config = gst_buffer_pool_get_config (pool); gst_buffer_pool_config_get_params (config, &pcaps, NULL, NULL, NULL); GST_DEBUG_OBJECT (obj->element, "we had a pool with caps %" GST_PTR_FORMAT, pcaps); if (!gst_caps_is_equal (caps, pcaps)) { gst_structure_free (config); gst_object_unref (pool); goto different_caps; } gst_structure_free (config); } /* Some devices may expose a minimum */ ctl.id = V4L2_CID_MIN_BUFFERS_FOR_OUTPUT; if (v4l2_ioctl (obj->video_fd, VIDIOC_G_CTRL, &ctl) >= 0) { GST_DEBUG_OBJECT (obj->element, "driver require a miminum of %d buffers", ctl.value); obj->min_buffers = ctl.value; } else { obj->min_buffers = 0; } min = MAX (obj->min_buffers, GST_V4L2_MIN_BUFFERS); gst_query_add_allocation_pool (query, pool, size, min, max); /* we also support various metadata */ gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL); if (pool) gst_object_unref (pool); return TRUE; /* ERRORS */ no_caps: { GST_DEBUG_OBJECT (obj->element, "no caps specified"); return FALSE; } different_caps: { /* different caps, we can't use this pool */ GST_DEBUG_OBJECT (obj->element, "pool has different caps"); return FALSE; } }