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_LOCK (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 (!g_atomic_int_get (&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);
361 GstV4l2BufferPool *v4l2_pool = GST_V4L2_BUFFER_POOL (self->v4l2capture->pool);
363 GstVideoCodecFrame *frame;
364 GstBuffer *buffer = NULL;
367 GST_LOG_OBJECT (decoder, "Allocate output buffer");
370 /* We cannot use the base class allotate helper since it taking the internal
371 * stream lock. we know that the acquire may need to poll until more frames
372 * comes in and holding this lock would prevent that.
374 pool = gst_video_decoder_get_buffer_pool (decoder);
376 /* Pool may be NULL if we started going to READY state */
378 ret = GST_FLOW_FLUSHING;
382 ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
383 g_object_unref (pool);
385 if (ret != GST_FLOW_OK)
388 GST_LOG_OBJECT (decoder, "Process output buffer");
389 ret = gst_v4l2_buffer_pool_process (v4l2_pool, &buffer);
391 } while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER);
393 if (ret != GST_FLOW_OK)
396 frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
399 frame->output_buffer = buffer;
401 ret = gst_video_decoder_finish_frame (decoder, frame);
403 if (ret != GST_FLOW_OK)
406 GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers");
407 gst_buffer_unref (buffer);
413 GST_DEBUG_OBJECT (decoder, "Leaving output thread: %s",
414 gst_flow_get_name (ret));
416 gst_buffer_replace (&buffer, NULL);
417 self->output_flow = ret;
418 g_atomic_int_set (&self->processing, FALSE);
419 gst_v4l2_object_unlock (self->v4l2output);
420 gst_pad_pause_task (decoder->srcpad);
424 gst_v4l2_video_dec_loop_stopped (GstV4l2VideoDec * self)
426 /* When flushing, decoding thread may never run */
427 if (g_atomic_int_get (&self->processing)) {
428 GST_DEBUG_OBJECT (self, "Early stop of decoding thread");
429 self->output_flow = GST_FLOW_FLUSHING;
430 g_atomic_int_set (&self->processing, FALSE);
433 GST_DEBUG_OBJECT (self, "Decoding task destroyed: %s",
434 gst_flow_get_name (self->output_flow));
438 gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
439 GstVideoCodecFrame * frame)
441 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
442 GstFlowReturn ret = GST_FLOW_OK;
444 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
446 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
449 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
450 if (!self->input_state)
452 if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
456 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
457 GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
459 GstVideoCodecState *output_state;
460 GstBuffer *codec_data;
462 GST_DEBUG_OBJECT (self, "Sending header");
464 codec_data = self->input_state->codec_data;
466 /* We are running in byte-stream mode, so we don't know the headers, but
467 * we need to send something, otherwise the decoder will refuse to
471 gst_buffer_ref (codec_data);
473 codec_data = frame->input_buffer;
474 frame->input_buffer = NULL;
477 /* Ensure input internal pool is active */
478 if (!gst_buffer_pool_is_active (pool)) {
479 GstStructure *config = gst_buffer_pool_get_config (pool);
480 gst_buffer_pool_config_set_params (config, self->input_state->caps,
481 self->v4l2output->info.size, 2, 2);
483 /* There is no reason to refuse this config */
484 if (!gst_buffer_pool_set_config (pool, config))
485 goto activate_failed;
487 if (!gst_buffer_pool_set_active (pool, TRUE))
488 goto activate_failed;
491 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
493 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
494 v4l2output->pool), &codec_data);
495 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
497 gst_buffer_unref (codec_data);
499 if (!gst_v4l2_object_acquire_format (self->v4l2capture, &info))
502 output_state = gst_video_decoder_set_output_state (decoder,
503 info.finfo->format, info.width, info.height, self->input_state);
505 /* Copy the rest of the information, there might be more in the future */
506 output_state->info.interlace_mode = info.interlace_mode;
507 gst_video_codec_state_unref (output_state);
509 if (!gst_video_decoder_negotiate (decoder)) {
510 if (GST_PAD_IS_FLUSHING (decoder->srcpad))
516 /* Ensure our internal pool is activated */
517 if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
519 goto activate_failed;
522 if (g_atomic_int_get (&self->processing) == FALSE) {
523 /* It's possible that the processing thread stopped due to an error */
524 if (self->output_flow != GST_FLOW_OK &&
525 self->output_flow != GST_FLOW_FLUSHING) {
526 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
527 ret = self->output_flow;
531 GST_DEBUG_OBJECT (self, "Starting decoding thread");
533 /* Start the processing task, when it quits, the task will disable input
534 * processing to unlock input if draining, or prevent potential block */
535 g_atomic_int_set (&self->processing, TRUE);
536 if (!gst_pad_start_task (decoder->srcpad,
537 (GstTaskFunction) gst_v4l2_video_dec_loop, self,
538 (GDestroyNotify) gst_v4l2_video_dec_loop_stopped))
539 goto start_task_failed;
542 if (frame->input_buffer) {
543 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
545 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
546 pool), &frame->input_buffer);
547 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
549 if (ret == GST_FLOW_FLUSHING) {
550 if (g_atomic_int_get (&self->processing) == FALSE)
551 ret = self->output_flow;
553 } else if (ret != GST_FLOW_OK) {
557 /* No need to keep input arround */
558 gst_buffer_replace (&frame->input_buffer, NULL);
561 gst_video_codec_frame_unref (frame);
567 GST_ERROR_OBJECT (self, "not negotiated");
568 ret = GST_FLOW_NOT_NEGOTIATED;
573 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
574 (_("Failed to allocate required memory.")),
575 ("Buffer pool activation failed"));
576 ret = GST_FLOW_ERROR;
581 ret = GST_FLOW_FLUSHING;
587 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
588 (_("Failed to start decoding thread.")), (NULL));
589 g_atomic_int_set (&self->processing, FALSE);
590 ret = GST_FLOW_ERROR;
595 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
596 (_("Failed to process frame.")),
597 ("Maybe be due to not enough memory or failing driver"));
598 ret = GST_FLOW_ERROR;
603 gst_video_decoder_drop_frame (decoder, frame);
609 gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
612 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
613 GstClockTime latency;
614 gboolean ret = FALSE;
616 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
617 ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
620 latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
621 gst_video_decoder_set_latency (decoder, latency, latency);
627 gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
630 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
632 switch (GST_QUERY_TYPE (query)) {
633 case GST_QUERY_CAPS:{
634 GstCaps *filter, *result = NULL;
635 GstPad *pad = GST_VIDEO_DECODER_SRC_PAD (decoder);
637 gst_query_parse_caps (query, &filter);
639 if (self->probed_srccaps)
640 result = gst_caps_ref (self->probed_srccaps);
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 src 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)->src_query (decoder, query);
667 gst_v4l2_video_dec_sink_query (GstVideoDecoder * decoder, GstQuery * query)
670 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
672 switch (GST_QUERY_TYPE (query)) {
673 case GST_QUERY_CAPS:{
674 GstCaps *filter, *result = NULL;
675 GstPad *pad = GST_VIDEO_DECODER_SINK_PAD (decoder);
676 gst_query_parse_caps (query, &filter);
678 if (self->probed_sinkcaps)
679 result = gst_caps_ref (self->probed_sinkcaps);
681 result = gst_pad_get_pad_template_caps (pad);
684 GstCaps *tmp = result;
686 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
687 gst_caps_unref (tmp);
690 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
692 gst_query_set_caps_result (query, result);
693 gst_caps_unref (result);
698 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_query (decoder, query);
706 gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
708 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
711 switch (GST_EVENT_TYPE (event)) {
712 case GST_EVENT_FLUSH_START:
713 GST_DEBUG_OBJECT (self, "flush start");
714 gst_v4l2_object_unlock (self->v4l2output);
715 gst_v4l2_object_unlock (self->v4l2capture);
721 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
723 switch (GST_EVENT_TYPE (event)) {
724 case GST_EVENT_FLUSH_START:
725 /* The processing thread should stop now, wait for it */
726 gst_pad_stop_task (decoder->srcpad);
727 GST_DEBUG_OBJECT (self, "flush start done");
736 static GstStateChangeReturn
737 gst_v4l2_video_dec_change_state (GstElement * element,
738 GstStateChange transition)
740 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
741 GstVideoDecoder *decoder = GST_VIDEO_DECODER (element);
743 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
744 g_atomic_int_set (&self->active, FALSE);
745 gst_v4l2_object_unlock (self->v4l2output);
746 gst_v4l2_object_unlock (self->v4l2capture);
747 gst_pad_stop_task (decoder->srcpad);
750 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
754 gst_v4l2_video_dec_dispose (GObject * object)
756 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
758 gst_caps_replace (&self->probed_sinkcaps, NULL);
759 gst_caps_replace (&self->probed_srccaps, NULL);
761 G_OBJECT_CLASS (parent_class)->dispose (object);
765 gst_v4l2_video_dec_finalize (GObject * object)
767 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
769 gst_v4l2_object_destroy (self->v4l2capture);
770 gst_v4l2_object_destroy (self->v4l2output);
772 G_OBJECT_CLASS (parent_class)->finalize (object);
776 gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
778 /* V4L2 object are created in subinstance_init */
782 gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
784 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
785 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
786 GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);
788 gst_video_decoder_set_packetized (decoder, TRUE);
790 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
791 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
792 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
793 self->v4l2output->no_initial_format = TRUE;
794 self->v4l2output->keep_aspect = FALSE;
796 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
797 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
798 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
799 self->v4l2capture->no_initial_format = TRUE;
800 self->v4l2output->keep_aspect = FALSE;
804 gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
806 GstElementClass *element_class;
807 GObjectClass *gobject_class;
808 GstVideoDecoderClass *video_decoder_class;
810 parent_class = g_type_class_peek_parent (klass);
812 element_class = (GstElementClass *) klass;
813 gobject_class = (GObjectClass *) klass;
814 video_decoder_class = (GstVideoDecoderClass *) klass;
816 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
817 "V4L2 Video Decoder");
819 gst_element_class_set_static_metadata (element_class,
820 "V4L2 Video Decoder",
821 "Codec/Decoder/Video",
822 "Decode video streams via V4L2 API",
823 "Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
825 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
826 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
827 gobject_class->set_property =
828 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
829 gobject_class->get_property =
830 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
832 video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
833 video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
834 video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
835 video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
836 video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
837 video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
838 video_decoder_class->set_format =
839 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
840 video_decoder_class->negotiate =
841 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
842 video_decoder_class->decide_allocation =
843 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
844 /* FIXME propose_allocation or not ? */
845 video_decoder_class->handle_frame =
846 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
847 video_decoder_class->sink_query =
848 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_query);
849 video_decoder_class->src_query =
850 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
851 video_decoder_class->sink_event =
852 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
854 element_class->change_state =
855 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
857 gst_v4l2_object_install_m2m_properties_helper (gobject_class);
861 gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
863 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
864 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
865 GstV4l2VideoDecCData *cdata = data;
867 klass->default_device = cdata->device;
869 /* Note: gst_pad_template_new() take the floating ref from the caps */
870 gst_element_class_add_pad_template (element_class,
871 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
873 gst_element_class_add_pad_template (element_class,
874 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
880 /* Probing functions */
882 gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
884 gboolean ret = FALSE;
886 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ())
887 && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
894 gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
895 const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
897 GTypeQuery type_query;
898 GTypeInfo type_info = { 0, };
901 GstV4l2VideoDecCData *cdata;
903 cdata = g_new0 (GstV4l2VideoDecCData, 1);
904 cdata->device = g_strdup (device_path);
905 cdata->sink_caps = gst_caps_ref (sink_caps);
906 cdata->src_caps = gst_caps_ref (src_caps);
908 type = gst_v4l2_video_dec_get_type ();
909 g_type_query (type, &type_query);
910 memset (&type_info, 0, sizeof (type_info));
911 type_info.class_size = type_query.class_size;
912 type_info.instance_size = type_query.instance_size;
913 type_info.class_init = gst_v4l2_video_dec_subclass_init;
914 type_info.class_data = cdata;
915 type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
917 type_name = g_strdup_printf ("v4l2%sdec", basename);
918 subtype = g_type_register_static (type, type_name, &type_info, 0);
920 gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);