/* GStreamer * * gstv4lmjpegsrc.c: hardware MJPEG video source plugin * * Copyright (C) 2001-2002 Ronald Bultje * * 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., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H #include #endif #include #include "v4lmjpegsrc_calls.h" GST_DEBUG_CATEGORY (v4lmjpegsrc_debug); #define GST_CAT_DEFAULT v4lmjpegsrc_debug /* V4lMjpegSrc signals and args */ enum { SIGNAL_FRAME_CAPTURE, SIGNAL_FRAME_DROP, SIGNAL_FRAME_INSERT, SIGNAL_FRAME_LOST, LAST_SIGNAL }; /* arguments */ enum { ARG_0, #if 0 ARG_X_OFFSET, ARG_Y_OFFSET, ARG_F_WIDTH, ARG_F_HEIGHT, /* normally, we would want to use subframe capture, however, * for the time being it's easier if we disable it first */ #endif ARG_QUALITY, ARG_NUMBUFS, ARG_BUFSIZE, ARG_USE_FIXED_FPS }; GST_FORMATS_FUNCTION (GstPad *, gst_v4lmjpegsrc_get_formats, GST_FORMAT_TIME, GST_FORMAT_DEFAULT); GST_QUERY_TYPE_FUNCTION (GstPad *, gst_v4lmjpegsrc_get_query_types, GST_QUERY_POSITION); /* init functions */ static void gst_v4lmjpegsrc_base_init (gpointer g_class); static void gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass * klass); static void gst_v4lmjpegsrc_init (GstV4lMjpegSrc * v4lmjpegsrc); /* pad/info functions */ static gboolean gst_v4lmjpegsrc_src_convert (GstPad * pad, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value); static gboolean gst_v4lmjpegsrc_src_query (GstPad * pad, GstQueryType type, GstFormat * format, gint64 * value); /* buffer functions */ static GstPadLinkReturn gst_v4lmjpegsrc_srcconnect (GstPad * pad, const GstCaps * caps); static GstData *gst_v4lmjpegsrc_get (GstPad * pad); static GstCaps *gst_v4lmjpegsrc_getcaps (GstPad * pad); /* get/set params */ static void gst_v4lmjpegsrc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_v4lmjpegsrc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); /* set_clock function for A/V sync */ static void gst_v4lmjpegsrc_set_clock (GstElement * element, GstClock * clock); /* state handling */ static GstStateChangeReturn gst_v4lmjpegsrc_change_state (GstElement * element); /* requeue buffer after use */ static void gst_v4lmjpegsrc_buffer_free (GstBuffer * buffer); static GstElementClass *parent_class = NULL; static guint gst_v4lmjpegsrc_signals[LAST_SIGNAL] = { 0 }; GType gst_v4lmjpegsrc_get_type (void) { static GType v4lmjpegsrc_type = 0; if (!v4lmjpegsrc_type) { static const GTypeInfo v4lmjpegsrc_info = { sizeof (GstV4lMjpegSrcClass), gst_v4lmjpegsrc_base_init, NULL, (GClassInitFunc) gst_v4lmjpegsrc_class_init, NULL, NULL, sizeof (GstV4lMjpegSrc), 0, (GInstanceInitFunc) gst_v4lmjpegsrc_init, NULL }; v4lmjpegsrc_type = g_type_register_static (GST_TYPE_V4LELEMENT, "GstV4lMjpegSrc", &v4lmjpegsrc_info, 0); } return v4lmjpegsrc_type; } static void gst_v4lmjpegsrc_base_init (gpointer g_class) { static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("image/jpeg, " "width = (int) [ 0, MAX ], " "height = (int) [ 0, MAX ], " "framerate = (fraction) [ 0, MAX ]") ); GstElementClass *gstelement_class = GST_ELEMENT_CLASS (g_class); gst_element_class_set_details_sinmple (gstelement_class, "Video (video4linux/MJPEG) Source", "Source/Video", "Reads MJPEG-encoded frames from a zoran MJPEG/video4linux device", "GStreamer maintainers "); gst_element_class_add_static_pad_template (gstelement_class, &src_template); } static void gst_v4lmjpegsrc_class_init (GstV4lMjpegSrcClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; parent_class = g_type_class_peek_parent (klass); #if 0 g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_X_OFFSET, g_param_spec_int ("x-offset", "x_offset", "x_offset", G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_Y_OFFSET, g_param_spec_int ("y-offset", "y_offset", "y_offset", G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_F_WIDTH, g_param_spec_int ("frame-width", "frame_width", "frame_width", G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_F_HEIGHT, g_param_spec_int ("frame-height", "frame_height", "frame_height", G_MININT, G_MAXINT, 0, G_PARAM_WRITABLE | G_PARAM_STATIC_STRINGS)); #endif g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_QUALITY, g_param_spec_int ("quality", "Quality", "JPEG frame quality", 1, 100, 50, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_NUMBUFS, g_param_spec_int ("num-buffers", "Num Buffers", "Number of Buffers", 1, 256, 64, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BUFSIZE, g_param_spec_int ("buffer-size", "Buffer Size", "Size of buffers", 0, 512 * 1024, 128 * 1024, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_USE_FIXED_FPS, g_param_spec_boolean ("use-fixed-fps", "Use Fixed FPS", "Drop/Insert frames to reach a certain FPS (TRUE) " "or adapt FPS to suit the number of grabbed frames", TRUE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /* signals */ gst_v4lmjpegsrc_signals[SIGNAL_FRAME_CAPTURE] = g_signal_new ("frame-capture", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_capture), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); gst_v4lmjpegsrc_signals[SIGNAL_FRAME_DROP] = g_signal_new ("frame-drop", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_drop), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); gst_v4lmjpegsrc_signals[SIGNAL_FRAME_INSERT] = g_signal_new ("frame-insert", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_insert), NULL, NULL, g_cclosure_marshal_VOID__VOID, G_TYPE_NONE, 0); gst_v4lmjpegsrc_signals[SIGNAL_FRAME_LOST] = g_signal_new ("frame-lost", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstV4lMjpegSrcClass, frame_lost), NULL, NULL, g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT); GST_DEBUG_CATEGORY_INIT (v4lmjpegsrc_debug, "v4lmjpegsrc", 0, "V4L MJPEG source element"); gobject_class->set_property = gst_v4lmjpegsrc_set_property; gobject_class->get_property = gst_v4lmjpegsrc_get_property; gstelement_class->change_state = gst_v4lmjpegsrc_change_state; gstelement_class->set_clock = gst_v4lmjpegsrc_set_clock; } static void gst_v4lmjpegsrc_init (GstV4lMjpegSrc * v4lmjpegsrc) { GstElementClass *klass = GST_ELEMENT_GET_CLASS (v4lmjpegsrc); GST_OBJECT_FLAG_SET (GST_ELEMENT (v4lmjpegsrc), GST_ELEMENT_THREAD_SUGGESTED); v4lmjpegsrc->srcpad = gst_pad_new_from_template (gst_element_class_get_pad_template (klass, "src"), "src"); gst_element_add_pad (GST_ELEMENT (v4lmjpegsrc), v4lmjpegsrc->srcpad); gst_pad_set_get_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_get); gst_pad_set_getcaps_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_getcaps); gst_pad_set_link_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_srcconnect); gst_pad_set_convert_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_src_convert); gst_pad_set_formats_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_get_formats); gst_pad_set_query_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_src_query); gst_pad_set_query_type_function (v4lmjpegsrc->srcpad, gst_v4lmjpegsrc_get_query_types); #if 0 v4lmjpegsrc->frame_width = 0; v4lmjpegsrc->frame_height = 0; v4lmjpegsrc->x_offset = -1; v4lmjpegsrc->y_offset = -1; #endif v4lmjpegsrc->quality = 50; v4lmjpegsrc->numbufs = 64; /* no clock */ v4lmjpegsrc->clock = NULL; /* fps */ v4lmjpegsrc->use_fixed_fps = TRUE; v4lmjpegsrc->is_capturing = FALSE; } static gboolean gst_v4lmjpegsrc_get_fps (GstV4lMjpegSrc * v4lmjpegsrc, GValue * fps) { gint norm; g_return_val_if_fail (GST_VALUE_HOLDS_FRACTION (fps), FALSE); if (!v4lmjpegsrc->use_fixed_fps && v4lmjpegsrc->clock != NULL && v4lmjpegsrc->handled > 0) { /* try to get time from clock master and calculate fps */ GstClockTime time = gst_clock_get_time (v4lmjpegsrc->clock) - v4lmjpegsrc->substract_time; return v4lmjpegsrc->handled * GST_SECOND / time; } /* if that failed ... */ if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc))) return FALSE; if (!gst_v4l_get_chan_norm (GST_V4LELEMENT (v4lmjpegsrc), NULL, &norm)) return FALSE; if (norm == VIDEO_MODE_NTSC) gst_value_set_fraction (fps, 30000, 1001); else gst_value_set_fraction (fps, 25, 1); return TRUE; } static gboolean gst_v4lmjpegsrc_src_convert (GstPad * pad, GstFormat src_format, gint64 src_value, GstFormat * dest_format, gint64 * dest_value) { GstV4lMjpegSrc *v4lmjpegsrc; GValue fps = { 0 }; gboolean result = TRUE; v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad)); g_value_init (&fps, GST_VALUE_FRACTION); if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps)) return FALSE; switch (src_format) { case GST_FORMAT_TIME: switch (*dest_format) { case GST_FORMAT_DEFAULT: *dest_value = gst_util_uint64_scale (src_value, gst_value_get_fraction_numerator (&fps), gst_value_get_fraction_denominator (&fps) * GST_SECOND); break; default: result = FALSE; } break; case GST_FORMAT_DEFAULT: switch (*dest_format) { case GST_FORMAT_TIME: *dest_value = src_value * gst_util_uint64_scale_int (GST_SECOND, gst_value_get_fraction_denominator (&fps), gst_value_get_fraction_numerator (&fps)); break; default: result = FALSE; } break; default: result = FALSE; } g_value_unset (&fps); return result; } static gboolean gst_v4lmjpegsrc_src_query (GstPad * pad, GstQueryType type, GstFormat * format, gint64 * value) { GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad)); gboolean res = TRUE; GValue fps = { 0 }; g_value_init (&fps, GST_VALUE_FRACTION); if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps)) return FALSE; switch (type) { case GST_QUERY_POSITION: switch (*format) { case GST_FORMAT_TIME: *value = v4lmjpegsrc->handled * gst_util_uint64_scale_int (GST_SECOND, gst_value_get_fraction_denominator (&fps), gst_value_get_fraction_numerator (&fps)); break; case GST_FORMAT_DEFAULT: *value = v4lmjpegsrc->handled; break; default: res = FALSE; break; } break; default: res = FALSE; break; } g_value_unset (&fps); return res; } static inline gulong calc_bufsize (int hor_dec, int ver_dec) { guint8 div = hor_dec * ver_dec; guint32 num = (1024 * 512) / (div); guint32 result = 2; num--; while (num) { num >>= 1; result <<= 1; } if (result > (512 * 1024)) return (512 * 1024); if (result < 8192) return 8192; return result; } static GstPadLinkReturn gst_v4lmjpegsrc_srcconnect (GstPad * pad, const GstCaps * caps) { GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad)); gint hor_dec, ver_dec; gint w, h; gint max_w = GST_V4LELEMENT (v4lmjpegsrc)->vcap.maxwidth, max_h = GST_V4LELEMENT (v4lmjpegsrc)->vcap.maxheight; gulong bufsize; GstStructure *structure; gboolean was_capturing; /* in case the buffers are active (which means that we already * did capsnego before and didn't clean up), clean up anyways */ if ((was_capturing = v4lmjpegsrc->is_capturing)) { if (!gst_v4lmjpegsrc_capture_stop (v4lmjpegsrc)) return GST_PAD_LINK_REFUSED; } if (GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc))) { if (!gst_v4lmjpegsrc_capture_deinit (v4lmjpegsrc)) return GST_PAD_LINK_REFUSED; } else if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc))) { return GST_PAD_LINK_DELAYED; } /* Note: basically, we don't give a damn about the opposite caps here. * that might seem odd, but it isn't. we know that the opposite caps is * either NULL or has mime type image/jpeg, and in both cases, we'll set * our own mime type back and it'll work. Other properties are to be set * by the src, not by the opposite caps */ structure = gst_caps_get_structure (caps, 0); gst_structure_get_int (structure, "width", &w); gst_structure_get_int (structure, "height", &h); /* figure out decimation */ if (w >= max_w) { hor_dec = 1; } else if (w * 2 >= max_w) { hor_dec = 2; } else { hor_dec = 4; } if (h >= max_h) { ver_dec = 1; } else if (h * 2 >= max_h) { ver_dec = 2; } else { ver_dec = 4; } /* calculate bufsize */ bufsize = calc_bufsize (hor_dec, ver_dec); /* set buffer info */ if (!gst_v4lmjpegsrc_set_buffer (v4lmjpegsrc, v4lmjpegsrc->numbufs, bufsize)) { return GST_PAD_LINK_REFUSED; } /* set capture parameters and mmap the buffers */ if (hor_dec == ver_dec) { if (!gst_v4lmjpegsrc_set_capture (v4lmjpegsrc, hor_dec, v4lmjpegsrc->quality)) { return GST_PAD_LINK_REFUSED; } } else { if (!gst_v4lmjpegsrc_set_capture_m (v4lmjpegsrc, 0, 0, max_w, max_h, hor_dec, ver_dec, v4lmjpegsrc->quality)) { return GST_PAD_LINK_REFUSED; } } #if 0 if (!v4lmjpegsrc->frame_width && !v4lmjpegsrc->frame_height && v4lmjpegsrc->x_offset < 0 && v4lmjpegsrc->y_offset < 0 && v4lmjpegsrc->horizontal_decimation == v4lmjpegsrc->vertical_decimation) { if (!gst_v4lmjpegsrc_set_capture (v4lmjpegsrc, v4lmjpegsrc->horizontal_decimation, v4lmjpegsrc->quality)) return GST_PAD_LINK_REFUSED; } else { if (!gst_v4lmjpegsrc_set_capture_m (v4lmjpegsrc, v4lmjpegsrc->x_offset, v4lmjpegsrc->y_offset, v4lmjpegsrc->frame_width, v4lmjpegsrc->frame_height, v4lmjpegsrc->horizontal_decimation, v4lmjpegsrc->vertical_decimation, v4lmjpegsrc->quality)) return GST_PAD_LINK_REFUSED; } #endif if (!gst_v4lmjpegsrc_capture_init (v4lmjpegsrc)) return GST_PAD_LINK_REFUSED; if (was_capturing || GST_STATE (v4lmjpegsrc) == GST_STATE_PLAYING) if (!gst_v4lmjpegsrc_capture_start (v4lmjpegsrc)) return GST_PAD_LINK_REFUSED; return GST_PAD_LINK_OK; } static GstData * gst_v4lmjpegsrc_get (GstPad * pad) { GstV4lMjpegSrc *v4lmjpegsrc; GstBuffer *buf; gint num; GValue fps = { 0 }; GstClockTime duration; GstClockTime cur_frame_time; g_return_val_if_fail (pad != NULL, NULL); v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad)); if (v4lmjpegsrc->use_fixed_fps) { g_value_init (&fps, GST_VALUE_FRACTION); duration = gst_util_uint64_scale_int (GST_SECOND, gst_value_get_fraction_denominator (&fps), gst_value_get_fraction_numerator (&fps)); cur_frame_time = gst_util_uint64_scale_int (v4lmjpegsrc->handled * GST_SECOND, gst_value_get_fraction_denominator (&fps), gst_value_get_fraction_numerator (&fps)); if (!gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps)) { g_value_unset (&fps); return NULL; } } if (v4lmjpegsrc->need_writes > 0) { /* use last frame */ num = v4lmjpegsrc->last_frame; v4lmjpegsrc->need_writes--; } else if (v4lmjpegsrc->clock && v4lmjpegsrc->use_fixed_fps) { GstClockTime time; gboolean have_frame = FALSE; do { /* by default, we use the frame once */ v4lmjpegsrc->need_writes = 1; /* grab a frame from the device */ if (!gst_v4lmjpegsrc_grab_frame (v4lmjpegsrc, &num, &v4lmjpegsrc->last_size)) return NULL; v4lmjpegsrc->last_frame = num; time = GST_TIMEVAL_TO_TIME (v4lmjpegsrc->bsync.timestamp) - v4lmjpegsrc->substract_time; /* first check whether we lost any frames according to the device */ if (v4lmjpegsrc->last_seq != 0) { if (v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq > 1) { v4lmjpegsrc->need_writes = v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq; g_signal_emit (G_OBJECT (v4lmjpegsrc), gst_v4lmjpegsrc_signals[SIGNAL_FRAME_LOST], 0, v4lmjpegsrc->bsync.seq - v4lmjpegsrc->last_seq - 1); } } v4lmjpegsrc->last_seq = v4lmjpegsrc->bsync.seq; /* decide how often we're going to write the frame - set * v4lmjpegsrc->need_writes to (that-1) and have_frame to TRUE * if we're going to write it - else, just continue. * * time is generally the system or audio clock. Let's * say that we've written one second of audio, then we want * to have written one second of video too, within the same * timeframe. This means that if time - begin_time = X sec, * we want to have written X*fps frames. If we've written * more - drop, if we've written less - dup... */ if (cur_frame_time - time > 1.5 * duration) { /* yo dude, we've got too many frames here! Drop! DROP! */ v4lmjpegsrc->need_writes--; /* -= (v4lmjpegsrc->handled - (time / fps)); */ g_signal_emit (G_OBJECT (v4lmjpegsrc), gst_v4lmjpegsrc_signals[SIGNAL_FRAME_DROP], 0); } else if (cur_frame_time - time < -1.5 * duration) { /* this means we're lagging far behind */ v4lmjpegsrc->need_writes++; /* += ((time / fps) - v4lmjpegsrc->handled); */ g_signal_emit (G_OBJECT (v4lmjpegsrc), gst_v4lmjpegsrc_signals[SIGNAL_FRAME_INSERT], 0); } if (v4lmjpegsrc->need_writes > 0) { have_frame = TRUE; v4lmjpegsrc->use_num_times[num] = v4lmjpegsrc->need_writes; v4lmjpegsrc->need_writes--; } else { gst_v4lmjpegsrc_requeue_frame (v4lmjpegsrc, num); } } while (!have_frame); } else { /* grab a frame from the device */ if (!gst_v4lmjpegsrc_grab_frame (v4lmjpegsrc, &num, &v4lmjpegsrc->last_size)) return NULL; v4lmjpegsrc->use_num_times[num] = 1; } buf = gst_buffer_new (); GST_BUFFER_FREE_DATA_FUNC (buf) = gst_v4lmjpegsrc_buffer_free; GST_BUFFER_PRIVATE (buf) = v4lmjpegsrc; GST_BUFFER_DATA (buf) = gst_v4lmjpegsrc_get_buffer (v4lmjpegsrc, num); GST_BUFFER_SIZE (buf) = v4lmjpegsrc->last_size; GST_BUFFER_MAXSIZE (buf) = v4lmjpegsrc->breq.size; GST_BUFFER_FLAG_SET (buf, GST_BUFFER_READONLY); GST_BUFFER_FLAG_SET (buf, GST_BUFFER_DONTFREE); if (v4lmjpegsrc->use_fixed_fps) GST_BUFFER_TIMESTAMP (buf) = cur_frame_time; else /* calculate time based on our own clock */ GST_BUFFER_TIMESTAMP (buf) = GST_TIMEVAL_TO_TIME (v4lmjpegsrc->bsync.timestamp) - v4lmjpegsrc->substract_time; v4lmjpegsrc->handled++; g_signal_emit (G_OBJECT (v4lmjpegsrc), gst_v4lmjpegsrc_signals[SIGNAL_FRAME_CAPTURE], 0); return GST_DATA (buf); } static GstCaps * gst_v4lmjpegsrc_getcaps (GstPad * pad) { GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (gst_pad_get_parent (pad)); struct video_capability *vcap = &GST_V4LELEMENT (v4lmjpegsrc)->vcap; GstCaps *caps; GstStructure *str; gint i; GValue w = { 0 }, h = { 0}, w1 = { 0}, h1 = { 0}, fps = { 0}; if (!GST_V4L_IS_OPEN (GST_V4LELEMENT (v4lmjpegsrc))) { return gst_caps_copy (gst_pad_get_pad_template_caps (pad)); } g_value_init (&fps, GST_TYPE_FRACTION); gst_return_val_if_fail (gst_v4lmjpegsrc_get_fps (v4lmjpegsrc, &fps), NULL); caps = gst_caps_new_simple ("image/jpeg", NULL); str = gst_caps_get_structure (caps, 0); gst_structure_set_value (str, "framerate", &fps); g_value_unset (&fps); g_value_init (&w, GST_TYPE_LIST); g_value_init (&h, GST_TYPE_LIST); g_value_init (&w1, G_TYPE_INT); g_value_init (&h1, G_TYPE_INT); for (i = 0; i <= 2; i++) { g_value_set_int (&w1, vcap->maxwidth / (1 << i)); g_value_set_int (&h1, vcap->maxheight / (1 << i)); gst_value_list_append_value (&w, &w1); gst_value_list_append_value (&h, &h1); } g_value_unset (&h1); g_value_unset (&w1); gst_structure_set_value (str, "width", &w); gst_structure_set_value (str, "height", &h); g_value_unset (&w); g_value_unset (&h); return caps; } static void gst_v4lmjpegsrc_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstV4lMjpegSrc *v4lmjpegsrc; g_return_if_fail (GST_IS_V4LMJPEGSRC (object)); v4lmjpegsrc = GST_V4LMJPEGSRC (object); switch (prop_id) { #if 0 case ARG_X_OFFSET: v4lmjpegsrc->x_offset = g_value_get_int (value); break; case ARG_Y_OFFSET: v4lmjpegsrc->y_offset = g_value_get_int (value); break; case ARG_F_WIDTH: v4lmjpegsrc->frame_width = g_value_get_int (value); break; case ARG_F_HEIGHT: v4lmjpegsrc->frame_height = g_value_get_int (value); break; #endif case ARG_QUALITY: v4lmjpegsrc->quality = g_value_get_int (value); break; case ARG_NUMBUFS: v4lmjpegsrc->numbufs = g_value_get_int (value); break; case ARG_USE_FIXED_FPS: if (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc))) { v4lmjpegsrc->use_fixed_fps = g_value_get_boolean (value); } break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_v4lmjpegsrc_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstV4lMjpegSrc *v4lmjpegsrc; g_return_if_fail (GST_IS_V4LMJPEGSRC (object)); v4lmjpegsrc = GST_V4LMJPEGSRC (object); switch (prop_id) { #if 0 case ARG_X_OFFSET: g_value_set_int (value, v4lmjpegsrc->x_offset); break; case ARG_Y_OFFSET: g_value_set_int (value, v4lmjpegsrc->y_offset); break; case ARG_F_WIDTH: g_value_set_int (value, v4lmjpegsrc->frame_width); break; case ARG_F_HEIGHT: g_value_set_int (value, v4lmjpegsrc->frame_height); break; #endif case ARG_QUALITY: g_value_set_int (value, v4lmjpegsrc->quality); break; case ARG_NUMBUFS: if (GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc))) g_value_set_int (value, v4lmjpegsrc->breq.count); else g_value_set_int (value, v4lmjpegsrc->numbufs); break; case ARG_BUFSIZE: g_value_set_int (value, v4lmjpegsrc->breq.size); break; case ARG_USE_FIXED_FPS: g_value_set_boolean (value, v4lmjpegsrc->use_fixed_fps); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static GstStateChangeReturn gst_v4lmjpegsrc_change_state (GstElement * element, GstStateChange transition) { GstV4lMjpegSrc *v4lmjpegsrc; GTimeVal time; g_return_val_if_fail (GST_IS_V4LMJPEGSRC (element), GST_STATE_CHANGE_FAILURE); v4lmjpegsrc = GST_V4LMJPEGSRC (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: /* actual buffer set-up used to be done here - but I moved * it to capsnego itself */ v4lmjpegsrc->handled = 0; v4lmjpegsrc->need_writes = 0; v4lmjpegsrc->last_frame = 0; v4lmjpegsrc->substract_time = 0; break; case GST_STATE_CHANGE_PAUSED_TO_PLAYING: /* queue all buffer, start streaming capture */ if (GST_V4LELEMENT (v4lmjpegsrc)->buffer && !gst_v4lmjpegsrc_capture_start (v4lmjpegsrc)) return GST_STATE_CHANGE_FAILURE; g_get_current_time (&time); v4lmjpegsrc->substract_time = GST_TIMEVAL_TO_TIME (time) - v4lmjpegsrc->substract_time; v4lmjpegsrc->last_seq = 0; break; case GST_STATE_CHANGE_PLAYING_TO_PAUSED: g_get_current_time (&time); v4lmjpegsrc->substract_time = GST_TIMEVAL_TO_TIME (time) - v4lmjpegsrc->substract_time; /* de-queue all queued buffers */ if (v4lmjpegsrc->is_capturing && !gst_v4lmjpegsrc_capture_stop (v4lmjpegsrc)) return GST_STATE_CHANGE_FAILURE; break; case GST_STATE_CHANGE_PAUSED_TO_READY: /* stop capturing, unmap all buffers */ if (GST_V4LELEMENT (v4lmjpegsrc)->buffer && !gst_v4lmjpegsrc_capture_deinit (v4lmjpegsrc)) return GST_STATE_CHANGE_FAILURE; break; } if (GST_ELEMENT_CLASS (parent_class)->change_state) return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); return GST_STATE_CHANGE_SUCCESS; } static void gst_v4lmjpegsrc_set_clock (GstElement * element, GstClock * clock) { GST_V4LMJPEGSRC (element)->clock = clock; } #if 0 static GstBuffer * gst_v4lmjpegsrc_buffer_new (GstBufferPool * pool, guint64 offset, guint size, gpointer user_data) { GstBuffer *buffer; GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (user_data); if (!GST_V4L_IS_ACTIVE (GST_V4LELEMENT (v4lmjpegsrc))) return NULL; buffer = gst_buffer_new (); if (!buffer) return NULL; /* TODO: add interlacing info to buffer as metadata */ GST_BUFFER_MAXSIZE (buffer) = v4lmjpegsrc->breq.size; GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_DONTFREE); return buffer; } #endif static void gst_v4lmjpegsrc_buffer_free (GstBuffer * buf) { GstV4lMjpegSrc *v4lmjpegsrc = GST_V4LMJPEGSRC (GST_BUFFER_PRIVATE (buf)); int n; if (gst_element_get_state (GST_ELEMENT (v4lmjpegsrc)) != GST_STATE_PLAYING) return; /* we've already cleaned up ourselves */ for (n = 0; n < v4lmjpegsrc->breq.count; n++) if (GST_BUFFER_DATA (buf) == gst_v4lmjpegsrc_get_buffer (v4lmjpegsrc, n)) { v4lmjpegsrc->use_num_times[n]--; if (v4lmjpegsrc->use_num_times[n] <= 0) { gst_v4lmjpegsrc_requeue_frame (v4lmjpegsrc, n); } break; } if (n == v4lmjpegsrc->breq.count) GST_ELEMENT_ERROR (v4lmjpegsrc, RESOURCE, TOO_LAZY, (NULL), ("Couldn't find the buffer")); }