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_id, value,
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);
255 /* FIXME we probably need to do more work if pools are active */
258 ret = gst_v4l2_object_set_format (self->v4l2output, state->caps);
261 self->input_state = gst_video_codec_state_ref (state);
268 gst_v4l2_video_dec_flush (GstVideoDecoder * decoder)
270 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
272 GST_DEBUG_OBJECT (self, "Flushing");
274 /* Wait for capture thread to stop */
275 gst_pad_stop_task (decoder->srcpad);
276 self->output_flow = GST_FLOW_OK;
278 gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2output->pool));
279 gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2capture->pool));
281 /* Output will remain flushing until new frame comes in */
282 gst_v4l2_object_unlock_stop (self->v4l2capture);
288 gst_v4l2_video_dec_negotiate (GstVideoDecoder * decoder)
290 return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
294 gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
296 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
297 GstFlowReturn ret = GST_FLOW_OK;
300 if (!self->processing)
303 GST_DEBUG_OBJECT (self, "Finishing decoding");
305 /* Keep queuing empty buffers until the processing thread has stopped,
306 * _pool_process() will return FLUSHING when that happened */
307 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
308 while (ret == GST_FLOW_OK) {
309 buffer = gst_buffer_new ();
311 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
312 v4l2output->pool), buffer);
313 gst_buffer_unref (buffer);
315 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
317 /* Ensure the processing thread has stopped */
318 if (self->processing) {
319 gst_v4l2_object_unlock (self->v4l2capture);
320 gst_pad_stop_task (decoder->srcpad);
321 g_assert (g_atomic_int_get (&self->processing) == FALSE);
324 if (ret == GST_FLOW_FLUSHING)
325 ret = self->output_flow;
327 GST_DEBUG_OBJECT (decoder, "Done draining buffers");
333 static GstVideoCodecFrame *
334 gst_v4l2_video_dec_get_oldest_frame (GstVideoDecoder * decoder)
336 GstVideoCodecFrame *frame = NULL;
340 frames = gst_video_decoder_get_frames (decoder);
342 for (l = frames; l != NULL; l = l->next) {
343 GstVideoCodecFrame *f = l->data;
345 if (!frame || frame->pts > f->pts)
352 GST_LOG_OBJECT (decoder,
353 "Oldest frame is %d %" GST_TIME_FORMAT " and %d frames left",
354 frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
355 gst_video_codec_frame_ref (frame);
358 g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
364 gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
366 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
368 GstVideoCodecFrame *frame;
369 GstBuffer *buffer = NULL;
372 GST_LOG_OBJECT (decoder, "Allocate output buffer");
374 /* We cannot use the base class allotate helper since it taking the internal
375 * stream lock. we know that the acquire may need to poll until more frames
376 * comes in and holding this lock would prevent that.
378 pool = gst_video_decoder_get_buffer_pool (decoder);
379 ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
380 g_object_unref (pool);
382 if (ret != GST_FLOW_OK)
385 /* Check if buffer isn't the last one */
386 if (gst_buffer_get_size (buffer) == 0)
389 GST_LOG_OBJECT (decoder, "Process output buffer");
391 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
392 v4l2capture->pool), buffer);
394 if (ret != GST_FLOW_OK)
397 frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
400 frame->output_buffer = buffer;
402 ret = gst_video_decoder_finish_frame (decoder, frame);
404 if (ret != GST_FLOW_OK)
407 GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers");
408 gst_buffer_unref (buffer);
414 GST_DEBUG_OBJECT (decoder, "Leaving output thread");
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_handle_frame (GstVideoDecoder * decoder,
425 GstVideoCodecFrame * frame)
427 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
428 GstFlowReturn ret = GST_FLOW_OK;
430 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
432 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
435 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
436 if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
440 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
442 GstVideoCodecState *output_state;
443 GstBuffer *codec_data;
445 GST_DEBUG_OBJECT (self, "Sending header");
447 codec_data = self->input_state->codec_data;
449 /* We are running in byte-stream mode, so we don't know the headers, but
450 * we need to send something, otherwise the decoder will refuse to
454 gst_buffer_ref (codec_data);
456 codec_data = frame->input_buffer;
457 frame->input_buffer = NULL;
460 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
461 gst_v4l2_object_unlock_stop (self->v4l2output);
463 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
464 v4l2output->pool), codec_data);
465 gst_v4l2_object_unlock (self->v4l2output);
466 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
468 gst_buffer_unref (codec_data);
470 if (!gst_v4l2_object_setup_format (self->v4l2capture, &info, &self->align))
473 output_state = gst_video_decoder_set_output_state (decoder,
474 info.finfo->format, info.width, info.height, self->input_state);
476 /* Copy the rest of the information, there might be more in the future */
477 output_state->info.interlace_mode = info.interlace_mode;
478 gst_video_codec_state_unref (output_state);
480 if (!gst_video_decoder_negotiate (decoder)) {
481 if (GST_PAD_IS_FLUSHING (decoder->srcpad))
488 if (g_atomic_int_get (&self->processing) == FALSE) {
489 /* It possible that the processing thread stopped due to an error */
490 if (self->output_flow != GST_FLOW_OK) {
491 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
492 ret = self->output_flow;
496 GST_DEBUG_OBJECT (self, "Starting decoding thread");
498 /* Enable processing input */
499 gst_v4l2_object_unlock_stop (self->v4l2output);
501 /* Start the processing task, when it quits, the task will disable input
502 * processing to unlock input if draining, or prevent potential block */
503 g_atomic_int_set (&self->processing, TRUE);
504 gst_pad_start_task (decoder->srcpad,
505 (GstTaskFunction) gst_v4l2_video_dec_loop, self, NULL);
508 if (frame->input_buffer) {
509 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
511 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
512 pool), frame->input_buffer);
513 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
515 if (ret == GST_FLOW_FLUSHING) {
516 if (g_atomic_int_get (&self->processing) == FALSE)
517 ret = self->output_flow;
520 /* No need to keep input arround */
521 gst_buffer_replace (&frame->input_buffer, NULL);
524 gst_video_codec_frame_unref (frame);
530 GST_ERROR_OBJECT (self, "not negotiated");
531 ret = GST_FLOW_NOT_NEGOTIATED;
536 ret = GST_FLOW_FLUSHING;
541 gst_video_decoder_drop_frame (decoder, frame);
547 gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
550 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
551 GstClockTime latency;
552 gboolean ret = FALSE;
554 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
555 ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
558 latency = self->v4l2capture->min_buffers_for_capture *
559 self->v4l2capture->duration;
560 gst_video_decoder_set_latency (decoder, latency, latency);
566 gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
569 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
571 switch (GST_QUERY_TYPE (query)) {
572 case GST_QUERY_CAPS:{
573 GstCaps *filter, *result = NULL;
574 GstPad *pad = GST_VIDEO_DECODER_SRC_PAD (decoder);
576 gst_query_parse_caps (query, &filter);
578 if (self->probed_srccaps)
579 result = gst_caps_ref (self->probed_srccaps);
581 result = gst_pad_get_pad_template_caps (pad);
584 GstCaps *tmp = result;
586 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
587 gst_caps_unref (tmp);
590 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
592 gst_query_set_caps_result (query, result);
593 gst_caps_unref (result);
598 ret = GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
606 gst_v4l2_video_dec_sink_query (GstVideoDecoder * decoder, GstQuery * query)
609 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
611 switch (GST_QUERY_TYPE (query)) {
612 case GST_QUERY_CAPS:{
613 GstCaps *filter, *result = NULL;
614 GstPad *pad = GST_VIDEO_DECODER_SINK_PAD (decoder);
615 gst_query_parse_caps (query, &filter);
617 if (self->probed_sinkcaps)
618 result = gst_caps_ref (self->probed_sinkcaps);
620 result = gst_pad_get_pad_template_caps (pad);
623 GstCaps *tmp = result;
625 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
626 gst_caps_unref (tmp);
629 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
631 gst_query_set_caps_result (query, result);
632 gst_caps_unref (result);
637 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_query (decoder, query);
645 gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
647 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
649 switch (GST_EVENT_TYPE (event)) {
650 case GST_EVENT_FLUSH_START:
651 gst_v4l2_object_unlock (self->v4l2output);
652 gst_v4l2_object_unlock (self->v4l2capture);
657 return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
660 static GstStateChangeReturn
661 gst_v4l2_video_dec_change_state (GstElement * element,
662 GstStateChange transition)
664 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
666 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
667 g_atomic_int_set (&self->active, FALSE);
668 gst_v4l2_object_unlock (self->v4l2output);
669 gst_v4l2_object_unlock (self->v4l2capture);
672 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
676 gst_v4l2_video_dec_dispose (GObject * object)
678 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
680 gst_caps_replace (&self->probed_sinkcaps, NULL);
681 gst_caps_replace (&self->probed_srccaps, NULL);
683 G_OBJECT_CLASS (parent_class)->dispose (object);
687 gst_v4l2_video_dec_finalize (GObject * object)
689 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
691 gst_v4l2_object_destroy (self->v4l2capture);
692 gst_v4l2_object_destroy (self->v4l2output);
694 G_OBJECT_CLASS (parent_class)->finalize (object);
698 gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
700 /* V4L2 object are created in subinstance_init */
704 gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
706 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
707 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
708 GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);
710 gst_video_decoder_set_packetized (decoder, TRUE);
712 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
713 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
714 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
715 self->v4l2output->no_initial_format = TRUE;
716 self->v4l2output->keep_aspect = FALSE;
718 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
719 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
720 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
721 self->v4l2capture->no_initial_format = TRUE;
722 self->v4l2output->keep_aspect = FALSE;
724 g_object_set (self, "device", klass->default_device, NULL);
728 gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
730 GstElementClass *element_class;
731 GObjectClass *gobject_class;
732 GstVideoDecoderClass *video_decoder_class;
734 parent_class = g_type_class_peek_parent (klass);
736 element_class = (GstElementClass *) klass;
737 gobject_class = (GObjectClass *) klass;
738 video_decoder_class = (GstVideoDecoderClass *) klass;
740 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
741 "V4L2 Video Decoder");
743 gst_element_class_set_static_metadata (element_class,
744 "V4L2 Video Decoder",
745 "Codec/Decoder/Video",
746 "Decode video streams via V4L2 API",
747 "Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
749 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
750 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
751 gobject_class->set_property =
752 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
753 gobject_class->get_property =
754 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
756 video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
757 video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
758 video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
759 video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
760 video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
761 video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
762 video_decoder_class->set_format =
763 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
764 video_decoder_class->negotiate =
765 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
766 video_decoder_class->decide_allocation =
767 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
768 /* FIXME propose_allocation or not ? */
769 video_decoder_class->handle_frame =
770 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
771 video_decoder_class->sink_query =
772 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_query);
773 video_decoder_class->src_query =
774 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
775 video_decoder_class->sink_event =
776 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
778 element_class->change_state =
779 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
781 gst_v4l2_object_install_properties_helper (gobject_class,
782 DEFAULT_PROP_DEVICE);
785 * GstV4l2VideoDec:capture-io-mode
789 g_object_class_install_property (gobject_class, PROP_IO_MODE,
790 g_param_spec_enum ("capture-io-mode", "Capture IO mode",
792 GST_TYPE_V4L2_IO_MODE, GST_V4L2_IO_AUTO,
793 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
797 gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
799 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
800 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
801 GstV4l2VideoDecCData *cdata = data;
803 klass->default_device = cdata->device;
805 /* Note: gst_pad_template_new() take the floating ref from the caps */
806 gst_element_class_add_pad_template (element_class,
807 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
809 gst_element_class_add_pad_template (element_class,
810 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
816 /* Probing functions */
818 gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
820 gboolean ret = FALSE;
822 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ())
823 && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
830 gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
831 const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
833 GTypeQuery type_query;
834 GTypeInfo type_info = { 0, };
837 GstV4l2VideoDecCData *cdata;
839 cdata = g_new0 (GstV4l2VideoDecCData, 1);
840 cdata->device = g_strdup (device_path);
841 cdata->sink_caps = gst_caps_ref (sink_caps);
842 cdata->src_caps = gst_caps_ref (src_caps);
844 type = gst_v4l2_video_dec_get_type ();
845 g_type_query (type, &type_query);
846 memset (&type_info, 0, sizeof (type_info));
847 type_info.class_size = type_query.class_size;
848 type_info.instance_size = type_query.instance_size;
849 type_info.class_init = gst_v4l2_video_dec_subclass_init;
850 type_info.class_data = cdata;
851 type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
853 type_name = g_strdup_printf ("v4l2%sdec", basename);
854 subtype = g_type_register_static (type, type_name, &type_info, 0);
856 gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);