2 * Copyright (C) 2014 Collabora Ltd.
3 * Author: Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
15 * You should have received a copy of the GNU Library General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
32 #include "gstv4l2videodec.h"
33 #include "v4l2_calls.h"
36 #include <gst/gst-i18n-plugin.h>
38 GST_DEBUG_CATEGORY_STATIC (gst_v4l2_video_dec_debug);
39 #define GST_CAT_DEFAULT gst_v4l2_video_dec_debug
41 static gboolean gst_v4l2_video_dec_flush (GstVideoDecoder * decoder);
48 } GstV4l2VideoDecCData;
56 #define gst_v4l2_video_dec_parent_class parent_class
57 G_DEFINE_ABSTRACT_TYPE (GstV4l2VideoDec, gst_v4l2_video_dec,
58 GST_TYPE_VIDEO_DECODER);
61 gst_v4l2_video_dec_set_property (GObject * object,
62 guint prop_id, const GValue * value, GParamSpec * pspec)
64 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
67 case PROP_OUTPUT_IO_MODE:
68 gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
71 case PROP_CAPTURE_IO_MODE:
72 gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
76 /* By default, only set on output */
78 if (!gst_v4l2_object_set_property_helper (self->v4l2output,
79 prop_id, value, pspec)) {
80 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
87 gst_v4l2_video_dec_get_property (GObject * object,
88 guint prop_id, GValue * value, GParamSpec * pspec)
90 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
94 gst_v4l2_object_get_property_helper (self->v4l2output, prop_id, value,
97 case PROP_CAPTURE_IO_MODE:
98 gst_v4l2_object_get_property_helper (self->v4l2output, PROP_IO_MODE,
102 /* By default read from output */
104 if (!gst_v4l2_object_get_property_helper (self->v4l2output,
105 prop_id, value, pspec)) {
106 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
113 gst_v4l2_video_dec_open (GstVideoDecoder * decoder)
115 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
117 GST_DEBUG_OBJECT (self, "Opening");
119 if (!gst_v4l2_object_open (self->v4l2output))
122 if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
125 self->probed_sinkcaps = gst_v4l2_object_get_caps (self->v4l2output,
126 gst_v4l2_object_get_codec_caps ());
128 if (gst_caps_is_empty (self->probed_sinkcaps))
129 goto no_encoded_format;
131 self->probed_srccaps = gst_v4l2_object_get_caps (self->v4l2capture,
132 gst_v4l2_object_get_raw_caps ());
134 if (gst_caps_is_empty (self->probed_srccaps))
140 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
141 (_("Encoder on device %s has no supported input format"),
142 self->v4l2output->videodev), (NULL));
147 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
148 (_("Encoder on device %s has no supported output format"),
149 self->v4l2output->videodev), (NULL));
153 if (GST_V4L2_IS_OPEN (self->v4l2output))
154 gst_v4l2_object_close (self->v4l2output);
156 if (GST_V4L2_IS_OPEN (self->v4l2capture))
157 gst_v4l2_object_close (self->v4l2capture);
159 gst_caps_replace (&self->probed_srccaps, NULL);
160 gst_caps_replace (&self->probed_sinkcaps, NULL);
166 gst_v4l2_video_dec_close (GstVideoDecoder * decoder)
168 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
170 GST_DEBUG_OBJECT (self, "Closing");
172 gst_v4l2_object_close (self->v4l2output);
173 gst_v4l2_object_close (self->v4l2capture);
174 gst_caps_replace (&self->probed_srccaps, NULL);
175 gst_caps_replace (&self->probed_sinkcaps, NULL);
181 gst_v4l2_video_dec_start (GstVideoDecoder * decoder)
183 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
185 GST_DEBUG_OBJECT (self, "Starting");
187 gst_v4l2_object_unlock (self->v4l2output);
188 g_atomic_int_set (&self->active, TRUE);
189 self->output_flow = GST_FLOW_OK;
195 gst_v4l2_video_dec_stop (GstVideoDecoder * decoder)
197 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
199 GST_DEBUG_OBJECT (self, "Stopping");
201 gst_v4l2_object_unlock (self->v4l2output);
202 gst_v4l2_object_unlock (self->v4l2capture);
204 /* Wait for capture thread to stop */
205 gst_pad_stop_task (decoder->srcpad);
207 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
208 self->output_flow = GST_FLOW_OK;
209 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
211 /* Should have been flushed already */
212 g_assert (g_atomic_int_get (&self->active) == FALSE);
213 g_assert (g_atomic_int_get (&self->processing) == FALSE);
215 gst_v4l2_object_stop (self->v4l2output);
216 gst_v4l2_object_stop (self->v4l2capture);
218 if (self->input_state) {
219 gst_video_codec_state_unref (self->input_state);
220 self->input_state = NULL;
223 GST_DEBUG_OBJECT (self, "Stopped");
229 gst_v4l2_video_dec_set_format (GstVideoDecoder * decoder,
230 GstVideoCodecState * state)
233 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
235 GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
237 if (self->input_state) {
238 if (gst_v4l2_object_caps_equal (self->v4l2output, state->caps)) {
239 GST_DEBUG_OBJECT (self, "Compatible caps");
242 gst_video_codec_state_unref (self->input_state);
243 self->input_state = NULL;
245 /* FIXME we probably need to do more work if pools are active */
248 ret = gst_v4l2_object_set_format (self->v4l2output, state->caps);
251 self->input_state = gst_video_codec_state_ref (state);
258 gst_v4l2_video_dec_flush (GstVideoDecoder * decoder)
260 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
262 GST_DEBUG_OBJECT (self, "Flushed");
264 /* Ensure the processing thread has stopped for the reverse playback
266 if (g_atomic_int_get (&self->processing)) {
267 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
269 gst_v4l2_object_unlock (self->v4l2output);
270 gst_v4l2_object_unlock (self->v4l2capture);
271 gst_pad_stop_task (decoder->srcpad);
272 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
275 self->output_flow = GST_FLOW_OK;
277 gst_v4l2_object_unlock_stop (self->v4l2output);
278 gst_v4l2_object_unlock_stop (self->v4l2capture);
284 gst_v4l2_video_dec_negotiate (GstVideoDecoder * decoder)
286 return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
290 gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
292 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
293 GstFlowReturn ret = GST_FLOW_OK;
296 if (!self->processing)
299 GST_DEBUG_OBJECT (self, "Finishing decoding");
301 /* Keep queuing empty buffers until the processing thread has stopped,
302 * _pool_process() will return FLUSHING when that happened */
303 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
304 while (ret == GST_FLOW_OK) {
305 buffer = gst_buffer_new ();
307 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
308 v4l2output->pool), &buffer);
309 gst_buffer_unref (buffer);
312 /* and ensure the processing thread has stopped in case another error
314 gst_v4l2_object_unlock (self->v4l2capture);
315 gst_pad_stop_task (decoder->srcpad);
316 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
318 if (ret == GST_FLOW_FLUSHING)
319 ret = self->output_flow;
321 GST_DEBUG_OBJECT (decoder, "Done draining buffers");
327 static GstVideoCodecFrame *
328 gst_v4l2_video_dec_get_oldest_frame (GstVideoDecoder * decoder)
330 GstVideoCodecFrame *frame = NULL;
334 frames = gst_video_decoder_get_frames (decoder);
336 for (l = frames; l != NULL; l = l->next) {
337 GstVideoCodecFrame *f = l->data;
339 if (!frame || frame->pts > f->pts)
346 GST_LOG_OBJECT (decoder,
347 "Oldest frame is %d %" GST_TIME_FORMAT " and %d frames left",
348 frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
349 gst_video_codec_frame_ref (frame);
352 g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
358 gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
360 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
362 GstVideoCodecFrame *frame;
363 GstBuffer *buffer = NULL;
366 GST_LOG_OBJECT (decoder, "Allocate output buffer");
368 /* We cannot use the base class allotate helper since it taking the internal
369 * stream lock. we know that the acquire may need to poll until more frames
370 * comes in and holding this lock would prevent that.
372 pool = gst_video_decoder_get_buffer_pool (decoder);
374 /* Pool may be NULL if we started going to READY state */
376 ret = GST_FLOW_FLUSHING;
380 ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
381 g_object_unref (pool);
383 if (ret != GST_FLOW_OK)
386 GST_LOG_OBJECT (decoder, "Process output buffer");
388 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
389 v4l2capture->pool), &buffer);
391 if (ret != GST_FLOW_OK)
394 frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
397 frame->output_buffer = buffer;
399 ret = gst_video_decoder_finish_frame (decoder, frame);
401 if (ret != GST_FLOW_OK)
404 GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers");
405 gst_buffer_unref (buffer);
411 GST_DEBUG_OBJECT (decoder, "Leaving output thread: %s",
412 gst_flow_get_name (ret));
414 gst_buffer_replace (&buffer, NULL);
415 self->output_flow = ret;
416 g_atomic_int_set (&self->processing, FALSE);
417 gst_v4l2_object_unlock (self->v4l2output);
418 gst_pad_pause_task (decoder->srcpad);
422 gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
423 GstVideoCodecFrame * frame)
425 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
426 GstFlowReturn ret = GST_FLOW_OK;
428 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
430 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
433 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
434 if (!self->input_state)
436 if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
440 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
441 GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
443 GstVideoCodecState *output_state;
444 GstBuffer *codec_data;
446 GST_DEBUG_OBJECT (self, "Sending header");
448 codec_data = self->input_state->codec_data;
450 /* We are running in byte-stream mode, so we don't know the headers, but
451 * we need to send something, otherwise the decoder will refuse to
455 gst_buffer_ref (codec_data);
457 codec_data = frame->input_buffer;
458 frame->input_buffer = NULL;
461 /* Ensure input internal pool is active */
462 if (!gst_buffer_pool_is_active (pool)) {
463 GstStructure *config = gst_buffer_pool_get_config (pool);
464 gst_buffer_pool_config_set_params (config, self->input_state->caps,
465 self->v4l2output->info.size, 2, 2);
467 /* There is no reason to refuse this config */
468 if (!gst_buffer_pool_set_config (pool, config))
469 goto activate_failed;
471 if (!gst_buffer_pool_set_active (pool, TRUE))
472 goto activate_failed;
475 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
477 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
478 v4l2output->pool), &codec_data);
479 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
481 gst_buffer_unref (codec_data);
483 if (!gst_v4l2_object_acquire_format (self->v4l2capture, &info))
486 output_state = gst_video_decoder_set_output_state (decoder,
487 info.finfo->format, info.width, info.height, self->input_state);
489 /* Copy the rest of the information, there might be more in the future */
490 output_state->info.interlace_mode = info.interlace_mode;
491 gst_video_codec_state_unref (output_state);
493 if (!gst_video_decoder_negotiate (decoder)) {
494 if (GST_PAD_IS_FLUSHING (decoder->srcpad))
500 /* Ensure our internal pool is activated */
501 if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
503 goto activate_failed;
506 if (g_atomic_int_get (&self->processing) == FALSE) {
507 /* It possible that the processing thread stopped due to an error */
508 if (self->output_flow != GST_FLOW_OK) {
509 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
510 ret = self->output_flow;
514 GST_DEBUG_OBJECT (self, "Starting decoding thread");
516 /* Start the processing task, when it quits, the task will disable input
517 * processing to unlock input if draining, or prevent potential block */
518 g_atomic_int_set (&self->processing, TRUE);
519 gst_pad_start_task (decoder->srcpad,
520 (GstTaskFunction) gst_v4l2_video_dec_loop, self, NULL);
523 if (frame->input_buffer) {
524 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
526 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
527 pool), &frame->input_buffer);
528 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
530 if (ret == GST_FLOW_FLUSHING) {
531 if (g_atomic_int_get (&self->processing) == FALSE)
532 ret = self->output_flow;
535 /* No need to keep input arround */
536 gst_buffer_replace (&frame->input_buffer, NULL);
539 gst_video_codec_frame_unref (frame);
545 GST_ERROR_OBJECT (self, "not negotiated");
546 ret = GST_FLOW_NOT_NEGOTIATED;
551 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
552 (_("Failed to allocate required memory.")),
553 ("Buffer pool activation failed"));
554 return GST_FLOW_ERROR;
558 ret = GST_FLOW_FLUSHING;
563 gst_video_decoder_drop_frame (decoder, frame);
569 gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
572 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
573 GstClockTime latency;
574 gboolean ret = FALSE;
576 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
577 ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
580 latency = self->v4l2capture->min_buffers_for_capture *
581 self->v4l2capture->duration;
582 gst_video_decoder_set_latency (decoder, latency, latency);
588 gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
591 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
593 switch (GST_QUERY_TYPE (query)) {
594 case GST_QUERY_CAPS:{
595 GstCaps *filter, *result = NULL;
596 GstPad *pad = GST_VIDEO_DECODER_SRC_PAD (decoder);
598 gst_query_parse_caps (query, &filter);
600 if (self->probed_srccaps)
601 result = gst_caps_ref (self->probed_srccaps);
603 result = gst_pad_get_pad_template_caps (pad);
606 GstCaps *tmp = result;
608 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
609 gst_caps_unref (tmp);
612 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
614 gst_query_set_caps_result (query, result);
615 gst_caps_unref (result);
620 ret = GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
628 gst_v4l2_video_dec_sink_query (GstVideoDecoder * decoder, GstQuery * query)
631 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
633 switch (GST_QUERY_TYPE (query)) {
634 case GST_QUERY_CAPS:{
635 GstCaps *filter, *result = NULL;
636 GstPad *pad = GST_VIDEO_DECODER_SINK_PAD (decoder);
637 gst_query_parse_caps (query, &filter);
639 if (self->probed_sinkcaps)
640 result = gst_caps_ref (self->probed_sinkcaps);
642 result = gst_pad_get_pad_template_caps (pad);
645 GstCaps *tmp = result;
647 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
648 gst_caps_unref (tmp);
651 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
653 gst_query_set_caps_result (query, result);
654 gst_caps_unref (result);
659 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_query (decoder, query);
667 gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
669 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
672 switch (GST_EVENT_TYPE (event)) {
673 case GST_EVENT_FLUSH_START:
674 gst_v4l2_object_unlock (self->v4l2output);
675 gst_v4l2_object_unlock (self->v4l2capture);
681 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
683 switch (GST_EVENT_TYPE (event)) {
684 case GST_EVENT_FLUSH_START:
685 /* The processing thread should stop now, wait for it */
686 gst_pad_stop_task (decoder->srcpad);
695 static GstStateChangeReturn
696 gst_v4l2_video_dec_change_state (GstElement * element,
697 GstStateChange transition)
699 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
700 GstVideoDecoder *decoder = GST_VIDEO_DECODER (element);
702 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
703 g_atomic_int_set (&self->active, FALSE);
704 gst_v4l2_object_unlock (self->v4l2output);
705 gst_v4l2_object_unlock (self->v4l2capture);
706 gst_pad_stop_task (decoder->srcpad);
709 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
713 gst_v4l2_video_dec_dispose (GObject * object)
715 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
717 gst_caps_replace (&self->probed_sinkcaps, NULL);
718 gst_caps_replace (&self->probed_srccaps, NULL);
720 G_OBJECT_CLASS (parent_class)->dispose (object);
724 gst_v4l2_video_dec_finalize (GObject * object)
726 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
728 gst_v4l2_object_destroy (self->v4l2capture);
729 gst_v4l2_object_destroy (self->v4l2output);
731 G_OBJECT_CLASS (parent_class)->finalize (object);
735 gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
737 /* V4L2 object are created in subinstance_init */
741 gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
743 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
744 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
745 GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);
747 gst_video_decoder_set_packetized (decoder, TRUE);
749 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
750 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
751 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
752 self->v4l2output->no_initial_format = TRUE;
753 self->v4l2output->keep_aspect = FALSE;
755 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
756 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
757 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
758 self->v4l2capture->no_initial_format = TRUE;
759 self->v4l2output->keep_aspect = FALSE;
763 gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
765 GstElementClass *element_class;
766 GObjectClass *gobject_class;
767 GstVideoDecoderClass *video_decoder_class;
769 parent_class = g_type_class_peek_parent (klass);
771 element_class = (GstElementClass *) klass;
772 gobject_class = (GObjectClass *) klass;
773 video_decoder_class = (GstVideoDecoderClass *) klass;
775 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
776 "V4L2 Video Decoder");
778 gst_element_class_set_static_metadata (element_class,
779 "V4L2 Video Decoder",
780 "Codec/Decoder/Video",
781 "Decode video streams via V4L2 API",
782 "Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
784 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
785 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
786 gobject_class->set_property =
787 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
788 gobject_class->get_property =
789 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
791 video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
792 video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
793 video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
794 video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
795 video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
796 video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
797 video_decoder_class->set_format =
798 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
799 video_decoder_class->negotiate =
800 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
801 video_decoder_class->decide_allocation =
802 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
803 /* FIXME propose_allocation or not ? */
804 video_decoder_class->handle_frame =
805 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
806 video_decoder_class->sink_query =
807 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_query);
808 video_decoder_class->src_query =
809 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
810 video_decoder_class->sink_event =
811 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
813 element_class->change_state =
814 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
816 gst_v4l2_object_install_m2m_properties_helper (gobject_class);
820 gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
822 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
823 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
824 GstV4l2VideoDecCData *cdata = data;
826 klass->default_device = cdata->device;
828 /* Note: gst_pad_template_new() take the floating ref from the caps */
829 gst_element_class_add_pad_template (element_class,
830 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
832 gst_element_class_add_pad_template (element_class,
833 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
839 /* Probing functions */
841 gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
843 gboolean ret = FALSE;
845 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ())
846 && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
853 gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
854 const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
856 GTypeQuery type_query;
857 GTypeInfo type_info = { 0, };
860 GstV4l2VideoDecCData *cdata;
862 cdata = g_new0 (GstV4l2VideoDecCData, 1);
863 cdata->device = g_strdup (device_path);
864 cdata->sink_caps = gst_caps_ref (sink_caps);
865 cdata->src_caps = gst_caps_ref (src_caps);
867 type = gst_v4l2_video_dec_get_type ();
868 g_type_query (type, &type_query);
869 memset (&type_info, 0, sizeof (type_info));
870 type_info.class_size = type_query.class_size;
871 type_info.instance_size = type_query.instance_size;
872 type_info.class_init = gst_v4l2_video_dec_subclass_init;
873 type_info.class_data = cdata;
874 type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
876 type_name = g_strdup_printf ("v4l2%sdec", basename);
877 subtype = g_type_register_static (type, type_name, &type_info, 0);
879 gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);