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gstreamer/sys/v4l2/gstv4l2object.c
Nicolas Dufresne e5ef2db489 v4l2: Fix support for caps without width, height, framerate or format 
For format like mpegts, width and height is rarely in the negotiated caps. This
patch fixes failure when setting format, and prevent introducing width, height,
framerate and format to the caps when fixating.

https://bugzilla.gnome.org/show_bug.cgi?id=725860
2014-04-01 14:28:08 -04:00

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/* GStreamer
*
* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
* 2006 Edgard Lima <edgard.lima@indt.org.br>
*
* 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 <config.h>
#endif
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#ifdef HAVE_GUDEV
#include <gudev/gudev.h>
#endif
#include "v4l2_calls.h"
#include "gstv4l2tuner.h"
#include "gstv4l2colorbalance.h"
#include "gst/gst-i18n-plugin.h"
#include <gst/video/video.h>
GST_DEBUG_CATEGORY_EXTERN (v4l2_debug);
GST_DEBUG_CATEGORY_EXTERN (GST_CAT_PERFORMANCE);
#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,
};
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"},
{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));
}
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->poll = gst_poll_new (TRUE);
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;
/*
* this boolean only applies in v4l2-MPLANE mode.
* TRUE: means it prefers to use several v4l2 (non contiguous)
* planes. For example if the device supports NV12 and NV12M
* both in MPLANE mode, then it will prefer NV12M
* FALSE: means it prefers to use one v4l2 plane (which contains
* all gst planes as if it was working in non-v4l2-MPLANE mode.
* For example if the device supports NV12 and NV12M
* both in MPLANE mode, then it will prefer NV12
*
* this boolean is also used to manage the case where the
* device only supports the mode MPLANE and at the same time it
* does not support both NV12 and NV12M. So in this case we first
* try to use the prefered config, and at least try the other case
* if it fails. For example in MPLANE mode if it has NV12 and not
* NV21M then even if you set prefered_non_contiguous to TRUE it will
* try NV21 as well.
*/
v4l2object->prefered_non_contiguous = TRUE;
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->poll)
gst_poll_free (v4l2object->poll);
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_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_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;
}
/*
* 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 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
* <code>struct v4l2_fmtdesc</code>.
*/
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_RGBx;
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;
g_assert_not_reached ();
break;
}
return format;
}
GstStructure *
gst_v4l2_object_v4l2fourcc_to_structure (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;
}
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_structure (gst_v4l2_formats[i].format);
if (structure) {
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);
}
gst_caps_append_structure (caps, structure);
}
}
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);
}
/* gst_v4l2_object_choose_fourcc:
* @obj a #GstV4l2Object
* @fourcc_splane The format type in single plane representation
* @fourcc_mplane The format type in multi-plane representation
* @fourcc Set to the first format to try
* @fourcc_alt The alternative format to use, or zero if mplane is not
* supported. Note that if alternate is used, the prefered_non_contiguous
* setting need to be inversed.
*
* Certain format can be stored into multi-planar buffer type with two
* representation. As an example, NV12, which has two planes, can be stored
* into 1 plane of multi-planar buffer sturcture, or two. This function will
* choose the right format to use base on the object settings.
*/
static void
gst_v4l2_object_choose_fourcc (GstV4l2Object * obj, guint32 fourcc_splane,
guint32 fourcc_mplane, guint32 * fourcc, guint32 * fourcc_alt)
{
if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
if (obj->prefered_non_contiguous) {
*fourcc = fourcc_mplane;
*fourcc_alt = fourcc_splane;
} else {
*fourcc = fourcc_splane;
*fourcc_alt = fourcc_mplane;
}
} else {
*fourcc = fourcc_splane;
*fourcc_alt = 0;
}
}
/* 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, fourcc_alt = 0;
const gchar *mimetype;
struct v4l2_fmtdesc *fmt;
/* default unknown values */
fourcc = 0;
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:
gst_v4l2_object_choose_fourcc (v4l2object, V4L2_PIX_FMT_NV12,
V4L2_PIX_FMT_NV12M, &fourcc, &fourcc_alt);
break;
case GST_VIDEO_FORMAT_NV12_64Z32:
fourcc = V4L2_PIX_FMT_NV12MT;
break;
case GST_VIDEO_FORMAT_NV21:
gst_v4l2_object_choose_fourcc (v4l2object, V4L2_PIX_FMT_NV21,
V4L2_PIX_FMT_NV21M, &fourcc, &fourcc_alt);
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_RGBx:
case GST_VIDEO_FORMAT_RGBA:
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;
}
}
if (fourcc == 0)
goto unhandled_format;
fmt = gst_v4l2_object_get_format_from_fourcc (v4l2object, fourcc);
if (fmt == NULL && fourcc_alt != 0) {
GST_DEBUG_OBJECT (v4l2object, "No support for %" GST_FOURCC_FORMAT
" trying %" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc),
GST_FOURCC_ARGS (fourcc_alt));
v4l2object->prefered_non_contiguous = !v4l2object->prefered_non_contiguous;
fmt = gst_v4l2_object_get_format_from_fourcc (v4l2object, fourcc_alt);
}
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, gboolean * interlaced);
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;
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;
}
/* 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, };
gboolean interlaced;
gint int_width = width;
gint int_height = height;
if (v4l2object->never_interlaced) {
interlaced = FALSE;
} else {
/* Interlaced detection using VIDIOC_TRY/S_FMT */
if (!gst_v4l2_object_get_nearest_size (v4l2object, pixelformat,
&int_width, &int_height, &interlaced))
return NULL;
}
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);
if (g_str_equal (gst_structure_get_name (s), "video/x-raw"))
gst_structure_set (s, "interlace-mode", G_TYPE_STRING,
(interlaced ? "mixed" : "progressive"), NULL);
if (G_IS_VALUE (&rates)) {
/* only change the framerate on the template when we have a valid probed new
* value */
gst_structure_set_value (s, "framerate", &rates);
g_value_unset (&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)
{
/* 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;
}
}
}
gst_caps_append_structure (caps, 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) {
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);
for (w = size.stepwise.min_width, h = size.stepwise.min_height;
w <= size.stepwise.max_width && h <= size.stepwise.max_height;
w += size.stepwise.step_width, h += size.stepwise.step_height) {
if (w == 0 || h == 0)
continue;
tmp =
gst_v4l2_object_probe_caps_for_format_and_size (v4l2object,
pixelformat, w, h, template);
if (tmp)
results = g_list_prepend (results, tmp);
}
GST_DEBUG_OBJECT (v4l2object->element,
"done iterating stepwise frame sizes");
} 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;
gboolean interlaced;
/* 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, &interlaced)) {
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, &interlaced)) {
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);
if (g_str_equal (gst_structure_get_name (tmp), "video/x-raw"))
gst_structure_set (tmp, "interlace-mode", G_TYPE_STRING,
(interlaced ? "mixed" : "progressive"), NULL);
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, gboolean * interlaced)
{
struct v4l2_format fmt, prevfmt;
int fd;
int r;
int prevfmt_valid = FALSE;
gboolean ret = FALSE;
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));
fd = v4l2object->video_fd;
memset (&fmt, 0, sizeof (struct v4l2_format));
memset (&prevfmt, 0, sizeof (struct v4l2_format));
/* Some drivers are buggy and will modify the currently set format
when processing VIDIOC_TRY_FMT, so we remember what is set at the
minute, and will reset it when done. */
if (!v4l2object->no_initial_format) {
prevfmt.type = v4l2object->type;
prevfmt_valid = (v4l2_ioctl (fd, VIDIOC_G_FMT, &prevfmt) >= 0);
}
/* 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_NONE;
r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
if (r < 0 && errno == EINVAL) {
/* try again with interlaced video */
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pixelformat;
fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
}
if (r < 0) {
/* The driver might not implement TRY_FMT, in which case we will try
S_FMT to probe */
if (errno != ENOTTY)
goto error;
/* Only try S_FMT if we're not actively capturing yet, which we shouldn't
be, because we're still probing */
if (GST_V4L2_IS_ACTIVE (v4l2object))
goto error;
GST_LOG_OBJECT (v4l2object->element,
"Failed to probe size limit with VIDIOC_TRY_FMT, trying VIDIOC_S_FMT");
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
if (r < 0 && errno == EINVAL) {
/* try again with progressive video */
fmt.fmt.pix.width = *width;
fmt.fmt.pix.height = *height;
fmt.fmt.pix.pixelformat = pixelformat;
fmt.fmt.pix.field = V4L2_FIELD_NONE;
r = v4l2_ioctl (fd, VIDIOC_S_FMT, &fmt);
}
if (r < 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;
switch (fmt.fmt.pix.field) {
case V4L2_FIELD_ANY:
case V4L2_FIELD_NONE:
*interlaced = FALSE;
break;
case V4L2_FIELD_INTERLACED:
case V4L2_FIELD_INTERLACED_TB:
case V4L2_FIELD_INTERLACED_BT:
*interlaced = TRUE;
break;
default:
GST_WARNING_OBJECT (v4l2object->element,
"Unsupported field type for %" GST_FOURCC_FORMAT "@%ux%u",
GST_FOURCC_ARGS (pixelformat), *width, *height);
goto error;
}
ret = TRUE;
error:
if (!ret) {
GST_WARNING_OBJECT (v4l2object->element,
"Unable to try format: %s", g_strerror (errno));
}
if (prevfmt_valid)
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &prevfmt) < 0) {
GST_WARNING_OBJECT (v4l2object->element,
"Unable to restore format after trying format: %s",
g_strerror (errno));
}
return ret;
}
static gboolean
gst_v4l2_object_setup_pool (GstV4l2Object * v4l2object, GstCaps * caps)
{
GstV4l2IOMode mode;
GST_DEBUG_OBJECT (v4l2object->element, "initializing the capture system");
GST_V4L2_CHECK_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
/* 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)
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_save_format (GstV4l2Object * v4l2object,
struct v4l2_fmtdesc *fmtdesc, struct v4l2_format *format,
GstVideoInfo * info)
{
const GstVideoFormatInfo *finfo = info->finfo;
gint i;
if (V4L2_TYPE_IS_MULTIPLANAR (v4l2object->type)) {
/* figure out the frame layout */
v4l2object->n_v4l2_planes = MAX (1, format->fmt.pix_mp.num_planes);
v4l2object->sizeimage = 0;
for (i = 0; i < format->fmt.pix_mp.num_planes; i++) {
v4l2object->bytesperline[i] =
format->fmt.pix_mp.plane_fmt[i].bytesperline;
v4l2object->sizeimage += format->fmt.pix_mp.plane_fmt[i].sizeimage;
}
} else {
/* only one plane in non-MPLANE mode */
v4l2object->n_v4l2_planes = 1;
/* figure out the frame layout */
for (i = 0; i < finfo->n_planes; i++) {
guint stride = format->fmt.pix.bytesperline;
switch (finfo->format) {
case GST_VIDEO_FORMAT_NV12:
case GST_VIDEO_FORMAT_NV21:
case GST_VIDEO_FORMAT_NV16:
case GST_VIDEO_FORMAT_NV24:
v4l2object->bytesperline[i] = (i == 0 ? 1 : 2) *
GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (finfo, i, stride);
break;
default:
v4l2object->bytesperline[i] =
GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (finfo, i, stride);
break;
}
GST_DEBUG_OBJECT (v4l2object->element,
"Extrapolated stride for plane %d from %d to %d", i, stride,
v4l2object->bytesperline[i]);
}
v4l2object->sizeimage = format->fmt.pix.sizeimage;
}
GST_DEBUG_OBJECT (v4l2object->element, "Got sizeimage %u",
v4l2object->sizeimage);
v4l2object->info = *info;
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;
gint width, height, fps_n, fps_d;
gint i = 0;
GST_V4L2_CHECK_OPEN (v4l2object);
GST_V4L2_CHECK_NOT_ACTIVE (v4l2object);
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);
/* get bytesperline for each plane */
for (i = 0; i < GST_VIDEO_INFO_N_PLANES (&info); i++)
v4l2object->bytesperline[i] = GST_VIDEO_INFO_PLANE_STRIDE (&info, i);
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;
}
GST_DEBUG_OBJECT (v4l2object->element, "Desired format %dx%d, format "
"%" GST_FOURCC_FORMAT " stride: %d", width, height,
GST_FOURCC_ARGS (pixelformat), v4l2object->bytesperline[0]);
memset (&format, 0x00, sizeof (struct v4l2_format));
format.type = v4l2object->type;
if (!v4l2object->no_initial_format) {
if (v4l2_ioctl (fd, VIDIOC_G_FMT, &format) < 0)
goto get_fmt_failed;
}
if (V4L2_TYPE_IS_MULTIPLANAR (v4l2object->type)) {
GST_DEBUG_OBJECT (v4l2object->element, "Got format to %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);
/* 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;
}
if (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) {
/* even in v4l2 multiplanar mode we can work in contiguous mode
* if the device supports it */
gint n_v4l_planes = GST_VIDEO_INFO_N_PLANES (&info);
/* if encoded format (GST_VIDEO_INFO_N_PLANES return 0)
* or if contiguous is prefered */
if (!n_v4l_planes || !v4l2object->prefered_non_contiguous)
n_v4l_planes = 1;
/* 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));
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 < format.fmt.pix_mp.num_planes; i++)
format.fmt.pix_mp.plane_fmt[i].bytesperline =
v4l2object->bytesperline[i];
if (GST_VIDEO_INFO_FORMAT (&info) == GST_VIDEO_FORMAT_ENCODED) {
format.fmt.pix_mp.plane_fmt[0].sizeimage = ENCODED_BUFFER_SIZE;
}
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0)
goto set_fmt_failed;
GST_DEBUG_OBJECT (v4l2object->element, "Got format to %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),
format.fmt.pix_mp.num_planes);
#ifndef GST_DISABLE_GST_DEBUG
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);
#endif
if (format.fmt.pix_mp.pixelformat != pixelformat)
goto invalid_pixelformat;
/* we set the dimensions just in case but don't validate them afterwards
* For some codecs the dimensions are *not* in the bitstream, IIRC VC1
* in ASF mode for example. */
if (info.finfo->format != GST_VIDEO_FORMAT_ENCODED) {
if (format.fmt.pix_mp.width != width
|| format.fmt.pix_mp.height != height)
goto invalid_dimensions;
}
if (format.fmt.pix_mp.num_planes != n_v4l_planes)
goto invalid_planes;
}
/* figure out the frame layout */
v4l2object->n_v4l2_planes = format.fmt.pix_mp.num_planes;
v4l2object->sizeimage = 0;
for (i = 0; i < format.fmt.pix_mp.num_planes; i++) {
v4l2object->bytesperline[i] = format.fmt.pix_mp.plane_fmt[i].bytesperline;
v4l2object->sizeimage += format.fmt.pix_mp.plane_fmt[i].sizeimage;
}
} else {
GST_DEBUG_OBJECT (v4l2object->element, "Got format to %dx%d, format "
"%" GST_FOURCC_FORMAT " bytesperline %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);
/* 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;
}
if (format.type != v4l2object->type ||
format.fmt.pix.width != width ||
format.fmt.pix.height != height ||
format.fmt.pix.pixelformat != pixelformat ||
format.fmt.pix.field != field) {
/* something different, set the format */
GST_DEBUG_OBJECT (v4l2object->element, "Setting format to %dx%d, format "
"%" GST_FOURCC_FORMAT " bytesperline %d", width, height,
GST_FOURCC_ARGS (pixelformat), v4l2object->bytesperline[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;
/* try to ask our prefered stride */
format.fmt.pix.bytesperline = v4l2object->bytesperline[0];
if (GST_VIDEO_INFO_FORMAT (&info) == GST_VIDEO_FORMAT_ENCODED) {
format.fmt.pix.sizeimage = ENCODED_BUFFER_SIZE;
}
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0)
goto set_fmt_failed;
GST_DEBUG_OBJECT (v4l2object->element, "Got format to %dx%d, format "
"%" GST_FOURCC_FORMAT " stride %d", format.fmt.pix.width,
format.fmt.pix.height, GST_FOURCC_ARGS (format.fmt.pix.pixelformat),
format.fmt.pix.bytesperline);
/* we set the dimensions just in case but don't validate them afterwards
* For some codecs the dimensions are *not* in the bitstream, IIRC VC1
* in ASF mode for example. */
if (info.finfo->format != GST_VIDEO_FORMAT_ENCODED) {
if (format.fmt.pix.width != width || format.fmt.pix.height != height)
goto invalid_dimensions;
}
if (format.fmt.pix.pixelformat != pixelformat)
goto invalid_pixelformat;
}
}
/* 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:
gst_v4l2_object_save_format (v4l2object, fmtdesc, &format, &info);
/* now configure ther pools */
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:
{
GST_ELEMENT_ERROR (v4l2object->element, RESOURCE, SETTINGS,
(_("Video device could not create buffer pool.")), GST_ERROR_SYSTEM);
return FALSE;
}
}
/**
* gst_v4l2_object_setup_format:
* @v4l2object the object
* @info a GstVideoInfo to be filled
* @align a GstVideoAlignment to be filled
*
* Setup the format base on the currently configured format. This is useful in
* decoder or encoder elements where the output format is dictated by the
* input.
*
* Returns: %TRUE on success, %FALSE on failure.
*/
gboolean
gst_v4l2_object_setup_format (GstV4l2Object * v4l2object,
GstVideoInfo * info, GstVideoAlignment * align)
{
struct v4l2_fmtdesc *fmtdesc;
struct v4l2_format fmt;
struct v4l2_crop crop;
GstVideoFormat format;
guint width, height;
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);
/* FIXME do more work in the whole function if
* format is GST_VIDEO_FORMAT_ENCODED
* Also gst_v4l2_object_v4l2fourcc_to_video_format should be improved
* because for now it never returns GST_VIDEO_FORMAT_ENCODED
*/
/* 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);
/* 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_caps_equal (GstV4l2Object * v4l2object, GstCaps * caps)
{
GstStructure *s;
GstCaps *oldcaps;
if (!v4l2object->pool)
return FALSE;
s = gst_buffer_pool_get_config (GST_BUFFER_POOL_CAST (v4l2object->pool));
gst_buffer_pool_config_get_params (s, &oldcaps, NULL, NULL, NULL);
return oldcaps && gst_caps_is_equal (caps, oldcaps);
}
gboolean
gst_v4l2_object_unlock (GstV4l2Object * v4l2object)
{
GST_LOG_OBJECT (v4l2object->element, "flush poll");
gst_poll_set_flushing (v4l2object->poll, TRUE);
return TRUE;
}
gboolean
gst_v4l2_object_unlock_stop (GstV4l2Object * v4l2object)
{
GST_LOG_OBJECT (v4l2object->element, "flush stop poll");
gst_poll_set_flushing (v4l2object->poll, FALSE);
return TRUE;
}
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 (GST_BUFFER_POOL_CAST (v4l2object->pool), FALSE);
gst_object_unref (v4l2object->pool);
v4l2object->pool = NULL;
}
GST_V4L2_SET_INACTIVE (v4l2object);
done:
return TRUE;
}
gboolean
gst_v4l2_object_copy (GstV4l2Object * v4l2object, GstBuffer * dest,
GstBuffer * src)
{
const GstVideoFormatInfo *finfo = v4l2object->info.finfo;
if (finfo && (finfo->format != GST_VIDEO_FORMAT_UNKNOWN &&
finfo->format != GST_VIDEO_FORMAT_ENCODED)) {
GstVideoFrame src_frame, dest_frame;
GST_DEBUG_OBJECT (v4l2object->element, "copy video frame");
/* we have raw video, use videoframe copy to get strides right */
if (!gst_video_frame_map (&src_frame, &v4l2object->info, src, GST_MAP_READ))
goto invalid_buffer;
if (!gst_video_frame_map (&dest_frame, &v4l2object->info, dest,
GST_MAP_WRITE)) {
gst_video_frame_unmap (&src_frame);
goto invalid_buffer;
}
gst_video_frame_copy (&dest_frame, &src_frame);
gst_video_frame_unmap (&src_frame);
gst_video_frame_unmap (&dest_frame);
} else {
GstMapInfo map;
GST_DEBUG_OBJECT (v4l2object->element, "copy raw bytes");
gst_buffer_map (src, &map, GST_MAP_READ);
gst_buffer_fill (dest, 0, map.data, gst_buffer_get_size (src));
gst_buffer_unmap (src, &map);
gst_buffer_resize (dest, 0, gst_buffer_get_size (src));
}
GST_CAT_LOG_OBJECT (GST_CAT_PERFORMANCE, v4l2object->element,
"slow copy into buffer %p", dest);
return TRUE;
/* ERRORS */
invalid_buffer:
{
/* No Window available to put our image into */
GST_WARNING_OBJECT (v4l2object->element, "could not map image");
return FALSE;
}
}
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_structure (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)
{
GstBufferPool *pool;
guint size, min, max;
gboolean update;
struct v4l2_control ctl = { 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);
if (obj->pool == NULL) {
GstCaps *caps;
gst_query_parse_allocation (query, &caps, NULL);
if (!gst_v4l2_object_setup_pool (obj, caps))
goto pool_failed;
}
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);
if (min != 0) {
/* if there is a min-buffers suggestion, use it. We add 1 because we need 1
* buffer extra to capture while the other two buffers are downstream */
min += 1;
} else {
min = 2;
}
/* 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_for_capture = ctl.value;
min += ctl.value;
}
/* Request a bigger max, if one was suggested but it's too small */
if (max != 0 && max < min)
max = min;
/* select a pool */
switch (obj->mode) {
case GST_V4L2_IO_RW:
if (pool == NULL) {
/* no downstream pool, use our own then */
GST_DEBUG_OBJECT (obj->element,
"read/write mode: no downstream pool, using our own");
pool = GST_BUFFER_POOL_CAST (obj->pool);
size = obj->sizeimage;
} else {
/* 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->sizeimage);
}
break;
case GST_V4L2_IO_MMAP:
case GST_V4L2_IO_USERPTR:
case GST_V4L2_IO_DMABUF:
/* in streaming mode, prefer our own pool */
if (pool)
gst_object_unref (pool);
pool = GST_BUFFER_POOL_CAST (obj->pool);
size = obj->sizeimage;
max = 0;
GST_DEBUG_OBJECT (obj->element,
"streaming mode: using our own pool %" GST_PTR_FORMAT, pool);
break;
case GST_V4L2_IO_AUTO:
default:
GST_WARNING_OBJECT (obj->element, "unhandled mode");
break;
}
if (pool) {
GstStructure *config;
GstCaps *caps;
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_get_params (config, &caps, NULL, NULL, NULL);
gst_buffer_pool_config_set_params (config, caps, size, min, max);
/* if downstream supports video metadata, add this to the pool config */
if (gst_query_find_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL)) {
GST_DEBUG_OBJECT (pool, "activate Video Meta");
gst_buffer_pool_config_add_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_META);
}
gst_buffer_pool_set_config (pool, 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);
return TRUE;
pool_failed:
{
GST_ELEMENT_ERROR (obj->element, RESOURCE, SETTINGS,
(_("Video device could not create buffer pool.")), GST_ERROR_SYSTEM);
return FALSE;
}
}
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