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 #define DEFAULT_PROP_DEVICE "/dev/video0"
40 GST_DEBUG_CATEGORY_STATIC (gst_v4l2_video_dec_debug);
41 #define GST_CAT_DEFAULT gst_v4l2_video_dec_debug
43 static gboolean gst_v4l2_video_dec_flush (GstVideoDecoder * decoder);
50 } GstV4l2VideoDecCData;
55 V4L2_STD_OBJECT_PROPS,
59 #define gst_v4l2_video_dec_parent_class parent_class
60 G_DEFINE_ABSTRACT_TYPE (GstV4l2VideoDec, gst_v4l2_video_dec,
61 GST_TYPE_VIDEO_DECODER);
64 gst_v4l2_video_dec_set_property (GObject * object,
65 guint prop_id, const GValue * value, GParamSpec * pspec)
67 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
70 /* Split IO mode so output is configure through 'io-mode' and capture
71 * through 'capture-io-mode' */
73 gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
76 case PROP_CAPTURE_IO_MODE:
77 gst_v4l2_object_set_property_helper (self->v4l2capture, PROP_IO_MODE,
82 gst_v4l2_object_set_property_helper (self->v4l2output, prop_id, value,
84 gst_v4l2_object_set_property_helper (self->v4l2capture, prop_id, value,
88 /* By default, only set on output */
90 if (!gst_v4l2_object_set_property_helper (self->v4l2output,
91 prop_id, value, pspec)) {
92 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
99 gst_v4l2_video_dec_get_property (GObject * object,
100 guint prop_id, GValue * value, GParamSpec * pspec)
102 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
106 gst_v4l2_object_get_property_helper (self->v4l2output, prop_id, value,
109 case PROP_CAPTURE_IO_MODE:
110 gst_v4l2_object_get_property_helper (self->v4l2output, PROP_IO_MODE,
114 /* By default read from output */
116 if (!gst_v4l2_object_get_property_helper (self->v4l2output,
117 prop_id, value, pspec)) {
118 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
125 gst_v4l2_video_dec_open (GstVideoDecoder * decoder)
127 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
129 GST_DEBUG_OBJECT (self, "Opening");
131 if (!gst_v4l2_object_open (self->v4l2output))
134 if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
137 self->probed_sinkcaps = gst_v4l2_object_get_caps (self->v4l2output,
138 gst_v4l2_object_get_codec_caps ());
140 if (gst_caps_is_empty (self->probed_sinkcaps))
141 goto no_encoded_format;
143 self->probed_srccaps = gst_v4l2_object_get_caps (self->v4l2capture,
144 gst_v4l2_object_get_raw_caps ());
146 if (gst_caps_is_empty (self->probed_srccaps))
152 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
153 (_("Encoder on device %s has no supported input format"),
154 self->v4l2output->videodev), (NULL));
159 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
160 (_("Encoder on device %s has no supported output format"),
161 self->v4l2output->videodev), (NULL));
165 if (GST_V4L2_IS_OPEN (self->v4l2output))
166 gst_v4l2_object_close (self->v4l2output);
168 if (GST_V4L2_IS_OPEN (self->v4l2capture))
169 gst_v4l2_object_close (self->v4l2capture);
171 gst_caps_replace (&self->probed_srccaps, NULL);
172 gst_caps_replace (&self->probed_sinkcaps, NULL);
178 gst_v4l2_video_dec_close (GstVideoDecoder * decoder)
180 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
182 GST_DEBUG_OBJECT (self, "Closing");
184 gst_v4l2_object_close (self->v4l2output);
185 gst_v4l2_object_close (self->v4l2capture);
186 gst_caps_replace (&self->probed_srccaps, NULL);
187 gst_caps_replace (&self->probed_sinkcaps, NULL);
193 gst_v4l2_video_dec_start (GstVideoDecoder * decoder)
195 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
197 GST_DEBUG_OBJECT (self, "Starting");
199 gst_v4l2_object_unlock (self->v4l2output);
200 g_atomic_int_set (&self->active, TRUE);
201 self->output_flow = GST_FLOW_OK;
207 gst_v4l2_video_dec_stop (GstVideoDecoder * decoder)
209 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
211 GST_DEBUG_OBJECT (self, "Stopping");
213 gst_v4l2_object_unlock (self->v4l2output);
214 gst_v4l2_object_unlock (self->v4l2capture);
216 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
217 /* Wait for capture thread to stop */
218 gst_pad_stop_task (decoder->srcpad);
219 self->output_flow = GST_FLOW_OK;
220 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
222 /* Should have been flushed already */
223 g_assert (g_atomic_int_get (&self->active) == FALSE);
224 g_assert (g_atomic_int_get (&self->processing) == FALSE);
226 gst_v4l2_object_stop (self->v4l2output);
227 gst_v4l2_object_stop (self->v4l2capture);
229 if (self->input_state) {
230 gst_video_codec_state_unref (self->input_state);
231 self->input_state = NULL;
234 GST_DEBUG_OBJECT (self, "Stopped");
240 gst_v4l2_video_dec_set_format (GstVideoDecoder * decoder,
241 GstVideoCodecState * state)
244 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
246 GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
248 if (self->input_state) {
249 if (gst_v4l2_object_caps_equal (self->v4l2output, state->caps)) {
250 GST_DEBUG_OBJECT (self, "Compatible caps");
253 gst_video_codec_state_unref (self->input_state);
254 self->input_state = NULL;
256 /* FIXME we probably need to do more work if pools are active */
259 ret = gst_v4l2_object_set_format (self->v4l2output, state->caps);
262 self->input_state = gst_video_codec_state_ref (state);
269 gst_v4l2_video_dec_flush (GstVideoDecoder * decoder)
271 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
273 GST_DEBUG_OBJECT (self, "Flushing");
275 /* Wait for capture thread to stop */
276 gst_pad_stop_task (decoder->srcpad);
277 self->output_flow = GST_FLOW_OK;
279 if (self->v4l2output->pool)
280 gst_v4l2_buffer_pool_stop_streaming (GST_V4L2_BUFFER_POOL
281 (self->v4l2output->pool));
283 if (self->v4l2capture->pool)
284 gst_v4l2_buffer_pool_stop_streaming (GST_V4L2_BUFFER_POOL
285 (self->v4l2capture->pool));
291 gst_v4l2_video_dec_negotiate (GstVideoDecoder * decoder)
293 return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
297 gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
299 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
300 GstFlowReturn ret = GST_FLOW_OK;
303 if (!self->processing)
306 GST_DEBUG_OBJECT (self, "Finishing decoding");
308 /* Keep queuing empty buffers until the processing thread has stopped,
309 * _pool_process() will return FLUSHING when that happened */
310 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
311 while (ret == GST_FLOW_OK) {
312 buffer = gst_buffer_new ();
314 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
315 v4l2output->pool), &buffer);
316 gst_buffer_unref (buffer);
318 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
320 /* Ensure the processing thread has stopped */
321 if (self->processing) {
322 gst_v4l2_object_unlock (self->v4l2capture);
323 gst_pad_stop_task (decoder->srcpad);
324 g_assert (g_atomic_int_get (&self->processing) == FALSE);
327 if (ret == GST_FLOW_FLUSHING)
328 ret = self->output_flow;
330 GST_DEBUG_OBJECT (decoder, "Done draining buffers");
336 static GstVideoCodecFrame *
337 gst_v4l2_video_dec_get_oldest_frame (GstVideoDecoder * decoder)
339 GstVideoCodecFrame *frame = NULL;
343 frames = gst_video_decoder_get_frames (decoder);
345 for (l = frames; l != NULL; l = l->next) {
346 GstVideoCodecFrame *f = l->data;
348 if (!frame || frame->pts > f->pts)
355 GST_LOG_OBJECT (decoder,
356 "Oldest frame is %d %" GST_TIME_FORMAT " and %d frames left",
357 frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
358 gst_video_codec_frame_ref (frame);
361 g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
367 gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
369 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
371 GstVideoCodecFrame *frame;
372 GstBuffer *buffer = NULL;
375 GST_LOG_OBJECT (decoder, "Allocate output buffer");
377 /* We cannot use the base class allotate helper since it taking the internal
378 * stream lock. we know that the acquire may need to poll until more frames
379 * comes in and holding this lock would prevent that.
381 pool = gst_video_decoder_get_buffer_pool (decoder);
383 /* Pool may be NULL if we started going to READY state */
385 ret = GST_FLOW_FLUSHING;
389 ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
390 g_object_unref (pool);
392 if (ret != GST_FLOW_OK)
395 GST_LOG_OBJECT (decoder, "Process output buffer");
397 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
398 v4l2capture->pool), &buffer);
400 if (ret != GST_FLOW_OK)
403 frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
406 frame->output_buffer = buffer;
408 ret = gst_video_decoder_finish_frame (decoder, frame);
410 if (ret != GST_FLOW_OK)
413 GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers");
414 gst_buffer_unref (buffer);
420 GST_DEBUG_OBJECT (decoder, "Leaving output thread");
422 gst_buffer_replace (&buffer, NULL);
423 self->output_flow = ret;
424 g_atomic_int_set (&self->processing, FALSE);
425 gst_v4l2_object_unlock (self->v4l2output);
426 gst_pad_pause_task (decoder->srcpad);
430 gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
431 GstVideoCodecFrame * frame)
433 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
434 GstFlowReturn ret = GST_FLOW_OK;
436 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
438 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
441 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
442 if (!self->input_state)
444 if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
448 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
449 GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
451 GstVideoCodecState *output_state;
452 GstBuffer *codec_data;
454 GST_DEBUG_OBJECT (self, "Sending header");
456 codec_data = self->input_state->codec_data;
458 /* We are running in byte-stream mode, so we don't know the headers, but
459 * we need to send something, otherwise the decoder will refuse to
463 gst_buffer_ref (codec_data);
465 codec_data = frame->input_buffer;
466 frame->input_buffer = NULL;
469 /* Ensure input internal pool is active */
470 if (!gst_buffer_pool_is_active (pool)) {
471 GstStructure *config = gst_buffer_pool_get_config (pool);
472 gst_buffer_pool_config_set_params (config, self->input_state->caps,
473 self->v4l2output->info.size, 2, 2);
475 /* There is no reason to refuse this config */
476 if (!gst_buffer_pool_set_config (pool, config))
477 goto activate_failed;
479 if (!gst_buffer_pool_set_active (pool, TRUE))
480 goto activate_failed;
483 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
484 gst_v4l2_object_unlock_stop (self->v4l2output);
486 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
487 v4l2output->pool), &codec_data);
488 gst_v4l2_object_unlock (self->v4l2output);
489 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
491 gst_buffer_unref (codec_data);
493 if (!gst_v4l2_object_acquire_format (self->v4l2capture, &info))
496 output_state = gst_video_decoder_set_output_state (decoder,
497 info.finfo->format, info.width, info.height, self->input_state);
499 /* Copy the rest of the information, there might be more in the future */
500 output_state->info.interlace_mode = info.interlace_mode;
501 gst_video_codec_state_unref (output_state);
503 if (!gst_video_decoder_negotiate (decoder)) {
504 if (GST_PAD_IS_FLUSHING (decoder->srcpad))
510 /* Ensure our internal pool is activated */
511 if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
513 goto activate_failed;
516 if (g_atomic_int_get (&self->processing) == FALSE) {
517 /* It possible that the processing thread stopped due to an error */
518 if (self->output_flow != GST_FLOW_OK) {
519 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
520 ret = self->output_flow;
524 GST_DEBUG_OBJECT (self, "Starting decoding thread");
526 /* Enable processing input */
527 gst_v4l2_buffer_pool_start_streaming (GST_V4L2_BUFFER_POOL
528 (self->v4l2capture->pool));
529 gst_v4l2_object_unlock_stop (self->v4l2output);
530 gst_v4l2_object_unlock_stop (self->v4l2capture);
532 /* Start the processing task, when it quits, the task will disable input
533 * processing to unlock input if draining, or prevent potential block */
534 g_atomic_int_set (&self->processing, TRUE);
535 gst_pad_start_task (decoder->srcpad,
536 (GstTaskFunction) gst_v4l2_video_dec_loop, self, NULL);
539 if (frame->input_buffer) {
540 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
542 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
543 pool), &frame->input_buffer);
544 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
546 if (ret == GST_FLOW_FLUSHING) {
547 if (g_atomic_int_get (&self->processing) == FALSE)
548 ret = self->output_flow;
551 /* No need to keep input arround */
552 gst_buffer_replace (&frame->input_buffer, NULL);
555 gst_video_codec_frame_unref (frame);
561 GST_ERROR_OBJECT (self, "not negotiated");
562 ret = GST_FLOW_NOT_NEGOTIATED;
567 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
568 (_("Failed to allocate required memory.")),
569 ("Buffer pool activation failed"));
570 return GST_FLOW_ERROR;
574 ret = GST_FLOW_FLUSHING;
579 gst_video_decoder_drop_frame (decoder, frame);
585 gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
588 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
589 GstClockTime latency;
590 gboolean ret = FALSE;
592 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
593 ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
596 latency = self->v4l2capture->min_buffers_for_capture *
597 self->v4l2capture->duration;
598 gst_video_decoder_set_latency (decoder, latency, latency);
604 gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
607 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
609 switch (GST_QUERY_TYPE (query)) {
610 case GST_QUERY_CAPS:{
611 GstCaps *filter, *result = NULL;
612 GstPad *pad = GST_VIDEO_DECODER_SRC_PAD (decoder);
614 gst_query_parse_caps (query, &filter);
616 if (self->probed_srccaps)
617 result = gst_caps_ref (self->probed_srccaps);
619 result = gst_pad_get_pad_template_caps (pad);
622 GstCaps *tmp = result;
624 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
625 gst_caps_unref (tmp);
628 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
630 gst_query_set_caps_result (query, result);
631 gst_caps_unref (result);
636 ret = GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
644 gst_v4l2_video_dec_sink_query (GstVideoDecoder * decoder, GstQuery * query)
647 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
649 switch (GST_QUERY_TYPE (query)) {
650 case GST_QUERY_CAPS:{
651 GstCaps *filter, *result = NULL;
652 GstPad *pad = GST_VIDEO_DECODER_SINK_PAD (decoder);
653 gst_query_parse_caps (query, &filter);
655 if (self->probed_sinkcaps)
656 result = gst_caps_ref (self->probed_sinkcaps);
658 result = gst_pad_get_pad_template_caps (pad);
661 GstCaps *tmp = result;
663 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
664 gst_caps_unref (tmp);
667 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
669 gst_query_set_caps_result (query, result);
670 gst_caps_unref (result);
675 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_query (decoder, query);
683 gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
685 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
687 switch (GST_EVENT_TYPE (event)) {
688 case GST_EVENT_FLUSH_START:
689 gst_v4l2_object_unlock (self->v4l2output);
690 gst_v4l2_object_unlock (self->v4l2capture);
695 return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
698 static GstStateChangeReturn
699 gst_v4l2_video_dec_change_state (GstElement * element,
700 GstStateChange transition)
702 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
704 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
705 g_atomic_int_set (&self->active, FALSE);
706 gst_v4l2_object_unlock (self->v4l2output);
707 gst_v4l2_object_unlock (self->v4l2capture);
710 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
714 gst_v4l2_video_dec_dispose (GObject * object)
716 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
718 gst_caps_replace (&self->probed_sinkcaps, NULL);
719 gst_caps_replace (&self->probed_srccaps, NULL);
721 G_OBJECT_CLASS (parent_class)->dispose (object);
725 gst_v4l2_video_dec_finalize (GObject * object)
727 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
729 gst_v4l2_object_destroy (self->v4l2capture);
730 gst_v4l2_object_destroy (self->v4l2output);
732 G_OBJECT_CLASS (parent_class)->finalize (object);
736 gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
738 /* V4L2 object are created in subinstance_init */
742 gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
744 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
745 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
746 GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);
748 gst_video_decoder_set_packetized (decoder, TRUE);
750 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
751 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
752 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
753 self->v4l2output->no_initial_format = TRUE;
754 self->v4l2output->keep_aspect = FALSE;
756 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
757 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
758 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
759 self->v4l2capture->no_initial_format = TRUE;
760 self->v4l2output->keep_aspect = FALSE;
762 g_object_set (self, "device", klass->default_device, NULL);
766 gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
768 GstElementClass *element_class;
769 GObjectClass *gobject_class;
770 GstVideoDecoderClass *video_decoder_class;
772 parent_class = g_type_class_peek_parent (klass);
774 element_class = (GstElementClass *) klass;
775 gobject_class = (GObjectClass *) klass;
776 video_decoder_class = (GstVideoDecoderClass *) klass;
778 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
779 "V4L2 Video Decoder");
781 gst_element_class_set_static_metadata (element_class,
782 "V4L2 Video Decoder",
783 "Codec/Decoder/Video",
784 "Decode video streams via V4L2 API",
785 "Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
787 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
788 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
789 gobject_class->set_property =
790 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
791 gobject_class->get_property =
792 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
794 video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
795 video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
796 video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
797 video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
798 video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
799 video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
800 video_decoder_class->set_format =
801 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
802 video_decoder_class->negotiate =
803 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
804 video_decoder_class->decide_allocation =
805 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
806 /* FIXME propose_allocation or not ? */
807 video_decoder_class->handle_frame =
808 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
809 video_decoder_class->sink_query =
810 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_query);
811 video_decoder_class->src_query =
812 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
813 video_decoder_class->sink_event =
814 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
816 element_class->change_state =
817 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
819 gst_v4l2_object_install_properties_helper (gobject_class,
820 DEFAULT_PROP_DEVICE);
823 * GstV4l2VideoDec:capture-io-mode
827 g_object_class_install_property (gobject_class, PROP_CAPTURE_IO_MODE,
828 g_param_spec_enum ("capture-io-mode", "Capture IO mode",
830 GST_TYPE_V4L2_IO_MODE, GST_V4L2_IO_AUTO,
831 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
835 gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
837 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
838 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
839 GstV4l2VideoDecCData *cdata = data;
841 klass->default_device = cdata->device;
843 /* Note: gst_pad_template_new() take the floating ref from the caps */
844 gst_element_class_add_pad_template (element_class,
845 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
847 gst_element_class_add_pad_template (element_class,
848 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
854 /* Probing functions */
856 gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
858 gboolean ret = FALSE;
860 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ())
861 && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
868 gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
869 const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
871 GTypeQuery type_query;
872 GTypeInfo type_info = { 0, };
875 GstV4l2VideoDecCData *cdata;
877 cdata = g_new0 (GstV4l2VideoDecCData, 1);
878 cdata->device = g_strdup (device_path);
879 cdata->sink_caps = gst_caps_ref (sink_caps);
880 cdata->src_caps = gst_caps_ref (src_caps);
882 type = gst_v4l2_video_dec_get_type ();
883 g_type_query (type, &type_query);
884 memset (&type_info, 0, sizeof (type_info));
885 type_info.class_size = type_query.class_size;
886 type_info.instance_size = type_query.instance_size;
887 type_info.class_init = gst_v4l2_video_dec_subclass_init;
888 type_info.class_data = cdata;
889 type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
891 type_name = g_strdup_printf ("v4l2%sdec", basename);
892 subtype = g_type_register_static (type, type_name, &type_info, 0);
894 gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);