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 /* Should have been flushed already */
214 g_assert (g_atomic_int_get (&self->active) == FALSE);
215 g_assert (g_atomic_int_get (&self->processing) == FALSE);
217 gst_v4l2_object_stop (self->v4l2output);
218 gst_v4l2_object_stop (self->v4l2capture);
220 if (self->input_state) {
221 gst_video_codec_state_unref (self->input_state);
222 self->input_state = NULL;
225 GST_DEBUG_OBJECT (self, "Stopped");
231 gst_v4l2_video_dec_set_format (GstVideoDecoder * decoder,
232 GstVideoCodecState * state)
235 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
237 GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
239 if (self->input_state) {
240 if (gst_v4l2_object_caps_equal (self->v4l2output, state->caps)) {
241 GST_DEBUG_OBJECT (self, "Compatible caps");
244 gst_video_codec_state_unref (self->input_state);
246 /* FIXME we probably need to do more work if pools are active */
249 ret = gst_v4l2_object_set_format (self->v4l2output, state->caps);
252 self->input_state = gst_video_codec_state_ref (state);
259 gst_v4l2_video_dec_flush (GstVideoDecoder * decoder)
261 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
263 GST_DEBUG_OBJECT (self, "Flushing");
265 /* Wait for capture thread to stop */
266 gst_pad_stop_task (decoder->srcpad);
267 self->output_flow = GST_FLOW_OK;
269 gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2output->pool));
270 gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2capture->pool));
272 /* Output will remain flushing until new frame comes in */
273 gst_v4l2_object_unlock_stop (self->v4l2capture);
279 gst_v4l2_video_dec_negotiate (GstVideoDecoder * decoder)
281 return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
285 gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
287 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
288 GstFlowReturn ret = GST_FLOW_OK;
291 if (!self->input_state)
294 GST_DEBUG_OBJECT (self, "Finishing decoding");
296 /* Keep queuing empty buffers until the processing thread has stopped,
297 * _pool_process() will return FLUSHING when that happened */
298 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
299 while (ret == GST_FLOW_OK) {
300 buffer = gst_buffer_new ();
302 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
303 v4l2output->pool), buffer);
304 gst_buffer_unref (buffer);
306 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
308 g_assert (g_atomic_int_get (&self->processing) == FALSE);
310 if (ret == GST_FLOW_FLUSHING)
311 ret = self->output_flow;
313 GST_DEBUG_OBJECT (decoder, "Done draining buffers");
319 static GstVideoCodecFrame *
320 gst_v4l2_video_dec_get_oldest_frame (GstVideoDecoder * decoder)
322 GstVideoCodecFrame *frame = NULL;
326 frames = gst_video_decoder_get_frames (decoder);
328 for (l = frames; l != NULL; l = l->next) {
329 GstVideoCodecFrame *f = l->data;
331 if (!frame || frame->pts > f->pts)
338 GST_LOG_OBJECT (decoder,
339 "Oldest frame is %d %" GST_TIME_FORMAT " and %d frames left",
340 frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
341 gst_video_codec_frame_ref (frame);
344 g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
350 gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
352 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
354 GstVideoCodecFrame *frame;
355 GstBuffer *buffer = NULL;
358 GST_LOG_OBJECT (decoder, "Allocate output buffer");
360 /* We cannot use the base class allotate helper since it taking the internal
361 * stream lock. we know that the acquire may need to poll until more frames
362 * comes in and holding this lock would prevent that.
364 pool = gst_video_decoder_get_buffer_pool (decoder);
365 ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
366 g_object_unref (pool);
368 if (ret != GST_FLOW_OK)
371 /* Check if buffer isn't the last one */
372 if (gst_buffer_get_size (buffer) == 0)
375 GST_LOG_OBJECT (decoder, "Process output buffer");
377 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
378 v4l2capture->pool), buffer);
380 if (ret != GST_FLOW_OK)
383 frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
386 frame->output_buffer = buffer;
388 ret = gst_video_decoder_finish_frame (decoder, frame);
390 if (ret != GST_FLOW_OK)
393 GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers");
394 gst_buffer_unref (buffer);
400 GST_DEBUG_OBJECT (decoder, "Leaving output thread");
402 gst_buffer_replace (&buffer, NULL);
403 self->output_flow = ret;
404 g_atomic_int_set (&self->processing, FALSE);
405 gst_v4l2_object_unlock (self->v4l2output);
406 gst_pad_pause_task (decoder->srcpad);
410 gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
411 GstVideoCodecFrame * frame)
413 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
414 GstFlowReturn ret = GST_FLOW_OK;
416 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
418 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
421 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
422 if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
426 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
428 GstVideoCodecState *output_state;
429 GstBuffer *codec_data;
431 GST_DEBUG_OBJECT (self, "Sending header");
433 codec_data = self->input_state->codec_data;
435 /* We are running in byte-stream mode, so we don't know the headers, but
436 * we need to send something, otherwise the decoder will refuse to
440 gst_buffer_ref (codec_data);
442 codec_data = frame->input_buffer;
443 frame->input_buffer = NULL;
446 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
447 gst_v4l2_object_unlock_stop (self->v4l2output);
449 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
450 v4l2output->pool), codec_data);
451 gst_v4l2_object_unlock (self->v4l2output);
452 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
454 gst_buffer_unref (codec_data);
456 if (!gst_v4l2_object_setup_format (self->v4l2capture, &info, &self->align))
459 output_state = gst_video_decoder_set_output_state (decoder,
460 info.finfo->format, info.width, info.height, self->input_state);
462 /* Copy the rest of the information, there might be more in the future */
463 output_state->info.interlace_mode = info.interlace_mode;
464 gst_video_codec_state_unref (output_state);
466 if (!gst_video_decoder_negotiate (decoder)) {
467 if (GST_PAD_IS_FLUSHING (decoder->srcpad))
474 if (g_atomic_int_get (&self->processing) == FALSE) {
475 /* It possible that the processing thread stopped due to an error */
476 if (self->output_flow != GST_FLOW_OK) {
477 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
478 ret = self->output_flow;
482 GST_DEBUG_OBJECT (self, "Starting decoding thread");
484 /* Enable processing input */
485 gst_v4l2_object_unlock_stop (self->v4l2output);
487 /* Start the processing task, when it quits, the task will disable input
488 * processing to unlock input if draining, or prevent potential block */
489 g_atomic_int_set (&self->processing, TRUE);
490 gst_pad_start_task (decoder->srcpad,
491 (GstTaskFunction) gst_v4l2_video_dec_loop, self, NULL);
494 if (frame->input_buffer) {
495 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
497 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
498 pool), frame->input_buffer);
499 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
501 if (ret == GST_FLOW_FLUSHING) {
502 if (g_atomic_int_get (&self->processing) == FALSE)
503 ret = self->output_flow;
506 /* No need to keep input arround */
507 gst_buffer_replace (&frame->input_buffer, NULL);
510 gst_video_codec_frame_unref (frame);
516 GST_ERROR_OBJECT (self, "not negotiated");
517 ret = GST_FLOW_NOT_NEGOTIATED;
522 ret = GST_FLOW_FLUSHING;
527 gst_video_decoder_drop_frame (decoder, frame);
533 gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
536 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
537 GstClockTime latency;
538 gboolean ret = FALSE;
540 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
541 ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
544 latency = self->v4l2capture->min_buffers_for_capture *
545 self->v4l2capture->duration;
546 gst_video_decoder_set_latency (decoder, latency, latency);
552 gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
555 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
557 switch (GST_QUERY_TYPE (query)) {
558 case GST_QUERY_CAPS:{
559 GstCaps *filter, *result = NULL;
560 gst_query_parse_caps (query, &filter);
562 if (self->probed_srccaps)
563 result = gst_caps_ref (self->probed_srccaps);
565 result = gst_v4l2_object_get_raw_caps ();
568 GstCaps *tmp = result;
570 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
571 gst_caps_unref (tmp);
574 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
576 gst_query_set_caps_result (query, result);
577 gst_caps_unref (result);
582 ret = GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
590 gst_v4l2_video_dec_sink_query (GstVideoDecoder * decoder, GstQuery * query)
593 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
595 switch (GST_QUERY_TYPE (query)) {
596 case GST_QUERY_CAPS:{
597 GstCaps *filter, *result = NULL;
598 gst_query_parse_caps (query, &filter);
600 if (self->probed_sinkcaps)
601 result = gst_caps_ref (self->probed_sinkcaps);
603 result = gst_v4l2_object_get_codec_caps ();
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 sink 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)->sink_query (decoder, query);
628 gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
630 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
632 switch (GST_EVENT_TYPE (event)) {
633 case GST_EVENT_FLUSH_START:
634 gst_v4l2_object_unlock (self->v4l2output);
635 gst_v4l2_object_unlock (self->v4l2capture);
640 return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
643 static GstStateChangeReturn
644 gst_v4l2_video_dec_change_state (GstElement * element,
645 GstStateChange transition)
647 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
649 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
650 g_atomic_int_set (&self->active, FALSE);
651 gst_v4l2_object_unlock (self->v4l2output);
652 gst_v4l2_object_unlock (self->v4l2capture);
655 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
659 gst_v4l2_video_dec_dispose (GObject * object)
661 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
663 gst_caps_replace (&self->probed_sinkcaps, NULL);
664 gst_caps_replace (&self->probed_srccaps, NULL);
666 G_OBJECT_CLASS (parent_class)->dispose (object);
670 gst_v4l2_video_dec_finalize (GObject * object)
672 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
674 gst_v4l2_object_destroy (self->v4l2capture);
675 gst_v4l2_object_destroy (self->v4l2output);
677 G_OBJECT_CLASS (parent_class)->finalize (object);
681 gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
683 /* V4L2 object are created in subinstance_init */
687 gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
689 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
690 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
691 GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);
693 gst_video_decoder_set_packetized (decoder, TRUE);
695 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
696 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
697 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
698 self->v4l2output->no_initial_format = TRUE;
699 self->v4l2output->keep_aspect = FALSE;
701 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
702 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
703 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
704 self->v4l2capture->no_initial_format = TRUE;
705 self->v4l2output->keep_aspect = FALSE;
707 g_object_set (self, "device", klass->default_device, NULL);
711 gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
713 GstElementClass *element_class;
714 GObjectClass *gobject_class;
715 GstVideoDecoderClass *video_decoder_class;
717 parent_class = g_type_class_peek_parent (klass);
719 element_class = (GstElementClass *) klass;
720 gobject_class = (GObjectClass *) klass;
721 video_decoder_class = (GstVideoDecoderClass *) klass;
723 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
724 "V4L2 Video Decoder");
726 gst_element_class_set_static_metadata (element_class,
727 "V4L2 Video Decoder",
728 "Codec/Decoder/Video",
729 "Decode video streams via V4L2 API",
730 "Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
732 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
733 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
734 gobject_class->set_property =
735 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
736 gobject_class->get_property =
737 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
739 video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
740 video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
741 video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
742 video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
743 video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
744 video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
745 video_decoder_class->set_format =
746 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
747 video_decoder_class->negotiate =
748 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
749 video_decoder_class->decide_allocation =
750 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
751 /* FIXME propose_allocation or not ? */
752 video_decoder_class->handle_frame =
753 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
754 video_decoder_class->sink_query =
755 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_query);
756 video_decoder_class->src_query =
757 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
758 video_decoder_class->sink_event =
759 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
761 element_class->change_state =
762 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
764 gst_v4l2_object_install_properties_helper (gobject_class,
765 DEFAULT_PROP_DEVICE);
768 * GstV4l2VideoDec:capture-io-mode
772 g_object_class_install_property (gobject_class, PROP_IO_MODE,
773 g_param_spec_enum ("capture-io-mode", "Capture IO mode",
775 GST_TYPE_V4L2_IO_MODE, GST_V4L2_IO_AUTO,
776 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
780 gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
782 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
783 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
784 GstV4l2VideoDecCData *cdata = data;
786 klass->default_device = cdata->device;
788 /* Note: gst_pad_template_new() take the floating ref from the caps */
789 gst_element_class_add_pad_template (element_class,
790 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
792 gst_element_class_add_pad_template (element_class,
793 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
799 /* Probing functions */
801 gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
803 gboolean ret = FALSE;
805 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ())
806 && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
813 gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
814 const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
816 GTypeQuery type_query;
817 GTypeInfo type_info = { 0, };
820 GstV4l2VideoDecCData *cdata;
822 cdata = g_new0 (GstV4l2VideoDecCData, 1);
823 cdata->device = g_strdup (device_path);
824 cdata->sink_caps = gst_caps_ref (sink_caps);
825 cdata->src_caps = gst_caps_ref (src_caps);
827 type = gst_v4l2_video_dec_get_type ();
828 g_type_query (type, &type_query);
829 memset (&type_info, 0, sizeof (type_info));
830 type_info.class_size = type_query.class_size;
831 type_info.instance_size = type_query.instance_size;
832 type_info.class_init = gst_v4l2_video_dec_subclass_init;
833 type_info.class_data = cdata;
834 type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
836 type_name = g_strdup_printf ("v4l2%sdec", basename);
837 subtype = g_type_register_static (type, type_name, &type_info, 0);
839 gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);