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);
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 gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2output->pool));
280 gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2capture->pool));
282 /* Output will remain flushing until new frame comes in */
283 gst_v4l2_object_unlock_stop (self->v4l2capture);
289 gst_v4l2_video_dec_negotiate (GstVideoDecoder * decoder)
291 return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
295 gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
297 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
298 GstFlowReturn ret = GST_FLOW_OK;
301 if (!self->processing)
304 GST_DEBUG_OBJECT (self, "Finishing decoding");
306 /* Keep queuing empty buffers until the processing thread has stopped,
307 * _pool_process() will return FLUSHING when that happened */
308 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
309 while (ret == GST_FLOW_OK) {
310 buffer = gst_buffer_new ();
312 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
313 v4l2output->pool), buffer);
314 gst_buffer_unref (buffer);
316 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
318 /* Ensure the processing thread has stopped */
319 if (self->processing) {
320 gst_v4l2_object_unlock (self->v4l2capture);
321 gst_pad_stop_task (decoder->srcpad);
322 g_assert (g_atomic_int_get (&self->processing) == FALSE);
325 if (ret == GST_FLOW_FLUSHING)
326 ret = self->output_flow;
328 GST_DEBUG_OBJECT (decoder, "Done draining buffers");
334 static GstVideoCodecFrame *
335 gst_v4l2_video_dec_get_oldest_frame (GstVideoDecoder * decoder)
337 GstVideoCodecFrame *frame = NULL;
341 frames = gst_video_decoder_get_frames (decoder);
343 for (l = frames; l != NULL; l = l->next) {
344 GstVideoCodecFrame *f = l->data;
346 if (!frame || frame->pts > f->pts)
353 GST_LOG_OBJECT (decoder,
354 "Oldest frame is %d %" GST_TIME_FORMAT " and %d frames left",
355 frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
356 gst_video_codec_frame_ref (frame);
359 g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
365 gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
367 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
369 GstVideoCodecFrame *frame;
370 GstBuffer *buffer = NULL;
373 GST_LOG_OBJECT (decoder, "Allocate output buffer");
375 /* We cannot use the base class allotate helper since it taking the internal
376 * stream lock. we know that the acquire may need to poll until more frames
377 * comes in and holding this lock would prevent that.
379 pool = gst_video_decoder_get_buffer_pool (decoder);
381 /* Pool may be NULL if we started going to READY state */
383 ret = GST_FLOW_FLUSHING;
387 ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
388 g_object_unref (pool);
390 if (ret != GST_FLOW_OK)
393 /* Check if buffer isn't the last one */
394 if (gst_buffer_get_size (buffer) == 0)
397 GST_LOG_OBJECT (decoder, "Process output buffer");
399 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
400 v4l2capture->pool), buffer);
402 if (ret != GST_FLOW_OK)
405 frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
408 frame->output_buffer = buffer;
410 ret = gst_video_decoder_finish_frame (decoder, frame);
412 if (ret != GST_FLOW_OK)
415 GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers");
416 gst_buffer_unref (buffer);
422 GST_DEBUG_OBJECT (decoder, "Leaving output thread");
424 gst_buffer_replace (&buffer, NULL);
425 self->output_flow = ret;
426 g_atomic_int_set (&self->processing, FALSE);
427 gst_v4l2_object_unlock (self->v4l2output);
428 gst_pad_pause_task (decoder->srcpad);
432 gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
433 GstVideoCodecFrame * frame)
435 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
436 GstFlowReturn ret = GST_FLOW_OK;
438 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
440 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
443 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
444 if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
448 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
450 GstVideoCodecState *output_state;
451 GstBuffer *codec_data;
453 GST_DEBUG_OBJECT (self, "Sending header");
455 codec_data = self->input_state->codec_data;
457 /* We are running in byte-stream mode, so we don't know the headers, but
458 * we need to send something, otherwise the decoder will refuse to
462 gst_buffer_ref (codec_data);
464 codec_data = frame->input_buffer;
465 frame->input_buffer = NULL;
468 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
469 gst_v4l2_object_unlock_stop (self->v4l2output);
471 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
472 v4l2output->pool), codec_data);
473 gst_v4l2_object_unlock (self->v4l2output);
474 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
476 gst_buffer_unref (codec_data);
478 if (!gst_v4l2_object_setup_format (self->v4l2capture, &info, &self->align))
481 output_state = gst_video_decoder_set_output_state (decoder,
482 info.finfo->format, info.width, info.height, self->input_state);
484 /* Copy the rest of the information, there might be more in the future */
485 output_state->info.interlace_mode = info.interlace_mode;
486 gst_video_codec_state_unref (output_state);
488 if (!gst_video_decoder_negotiate (decoder)) {
489 if (GST_PAD_IS_FLUSHING (decoder->srcpad))
496 if (g_atomic_int_get (&self->processing) == FALSE) {
497 /* It possible that the processing thread stopped due to an error */
498 if (self->output_flow != GST_FLOW_OK) {
499 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
500 ret = self->output_flow;
504 GST_DEBUG_OBJECT (self, "Starting decoding thread");
506 /* Enable processing input */
507 gst_v4l2_object_unlock_stop (self->v4l2output);
509 /* Start the processing task, when it quits, the task will disable input
510 * processing to unlock input if draining, or prevent potential block */
511 g_atomic_int_set (&self->processing, TRUE);
512 gst_pad_start_task (decoder->srcpad,
513 (GstTaskFunction) gst_v4l2_video_dec_loop, self, NULL);
516 if (frame->input_buffer) {
517 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
519 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
520 pool), frame->input_buffer);
521 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
523 if (ret == GST_FLOW_FLUSHING) {
524 if (g_atomic_int_get (&self->processing) == FALSE)
525 ret = self->output_flow;
528 /* No need to keep input arround */
529 gst_buffer_replace (&frame->input_buffer, NULL);
532 gst_video_codec_frame_unref (frame);
538 GST_ERROR_OBJECT (self, "not negotiated");
539 ret = GST_FLOW_NOT_NEGOTIATED;
544 ret = GST_FLOW_FLUSHING;
549 gst_video_decoder_drop_frame (decoder, frame);
555 gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
558 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
559 GstClockTime latency;
560 gboolean ret = FALSE;
562 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
563 ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
566 latency = self->v4l2capture->min_buffers_for_capture *
567 self->v4l2capture->duration;
568 gst_video_decoder_set_latency (decoder, latency, latency);
574 gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
577 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
579 switch (GST_QUERY_TYPE (query)) {
580 case GST_QUERY_CAPS:{
581 GstCaps *filter, *result = NULL;
582 GstPad *pad = GST_VIDEO_DECODER_SRC_PAD (decoder);
584 gst_query_parse_caps (query, &filter);
586 if (self->probed_srccaps)
587 result = gst_caps_ref (self->probed_srccaps);
589 result = gst_pad_get_pad_template_caps (pad);
592 GstCaps *tmp = result;
594 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
595 gst_caps_unref (tmp);
598 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
600 gst_query_set_caps_result (query, result);
601 gst_caps_unref (result);
606 ret = GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
614 gst_v4l2_video_dec_sink_query (GstVideoDecoder * decoder, GstQuery * query)
617 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
619 switch (GST_QUERY_TYPE (query)) {
620 case GST_QUERY_CAPS:{
621 GstCaps *filter, *result = NULL;
622 GstPad *pad = GST_VIDEO_DECODER_SINK_PAD (decoder);
623 gst_query_parse_caps (query, &filter);
625 if (self->probed_sinkcaps)
626 result = gst_caps_ref (self->probed_sinkcaps);
628 result = gst_pad_get_pad_template_caps (pad);
631 GstCaps *tmp = result;
633 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
634 gst_caps_unref (tmp);
637 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
639 gst_query_set_caps_result (query, result);
640 gst_caps_unref (result);
645 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_query (decoder, query);
653 gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
655 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
657 switch (GST_EVENT_TYPE (event)) {
658 case GST_EVENT_FLUSH_START:
659 gst_v4l2_object_unlock (self->v4l2output);
660 gst_v4l2_object_unlock (self->v4l2capture);
665 return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
668 static GstStateChangeReturn
669 gst_v4l2_video_dec_change_state (GstElement * element,
670 GstStateChange transition)
672 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
674 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
675 g_atomic_int_set (&self->active, FALSE);
676 gst_v4l2_object_unlock (self->v4l2output);
677 gst_v4l2_object_unlock (self->v4l2capture);
680 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
684 gst_v4l2_video_dec_dispose (GObject * object)
686 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
688 gst_caps_replace (&self->probed_sinkcaps, NULL);
689 gst_caps_replace (&self->probed_srccaps, NULL);
691 G_OBJECT_CLASS (parent_class)->dispose (object);
695 gst_v4l2_video_dec_finalize (GObject * object)
697 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
699 gst_v4l2_object_destroy (self->v4l2capture);
700 gst_v4l2_object_destroy (self->v4l2output);
702 G_OBJECT_CLASS (parent_class)->finalize (object);
706 gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
708 /* V4L2 object are created in subinstance_init */
712 gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
714 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
715 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
716 GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);
718 gst_video_decoder_set_packetized (decoder, TRUE);
720 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
721 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
722 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
723 self->v4l2output->no_initial_format = TRUE;
724 self->v4l2output->keep_aspect = FALSE;
726 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
727 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
728 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
729 self->v4l2capture->no_initial_format = TRUE;
730 self->v4l2output->keep_aspect = FALSE;
732 g_object_set (self, "device", klass->default_device, NULL);
736 gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
738 GstElementClass *element_class;
739 GObjectClass *gobject_class;
740 GstVideoDecoderClass *video_decoder_class;
742 parent_class = g_type_class_peek_parent (klass);
744 element_class = (GstElementClass *) klass;
745 gobject_class = (GObjectClass *) klass;
746 video_decoder_class = (GstVideoDecoderClass *) klass;
748 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
749 "V4L2 Video Decoder");
751 gst_element_class_set_static_metadata (element_class,
752 "V4L2 Video Decoder",
753 "Codec/Decoder/Video",
754 "Decode video streams via V4L2 API",
755 "Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
757 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
758 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
759 gobject_class->set_property =
760 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
761 gobject_class->get_property =
762 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
764 video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
765 video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
766 video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
767 video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
768 video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
769 video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
770 video_decoder_class->set_format =
771 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
772 video_decoder_class->negotiate =
773 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
774 video_decoder_class->decide_allocation =
775 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
776 /* FIXME propose_allocation or not ? */
777 video_decoder_class->handle_frame =
778 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
779 video_decoder_class->sink_query =
780 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_query);
781 video_decoder_class->src_query =
782 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
783 video_decoder_class->sink_event =
784 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
786 element_class->change_state =
787 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
789 gst_v4l2_object_install_properties_helper (gobject_class,
790 DEFAULT_PROP_DEVICE);
793 * GstV4l2VideoDec:capture-io-mode
797 g_object_class_install_property (gobject_class, PROP_IO_MODE,
798 g_param_spec_enum ("capture-io-mode", "Capture IO mode",
800 GST_TYPE_V4L2_IO_MODE, GST_V4L2_IO_AUTO,
801 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
805 gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
807 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
808 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
809 GstV4l2VideoDecCData *cdata = data;
811 klass->default_device = cdata->device;
813 /* Note: gst_pad_template_new() take the floating ref from the caps */
814 gst_element_class_add_pad_template (element_class,
815 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
817 gst_element_class_add_pad_template (element_class,
818 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
824 /* Probing functions */
826 gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
828 gboolean ret = FALSE;
830 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ())
831 && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
838 gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
839 const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
841 GTypeQuery type_query;
842 GTypeInfo type_info = { 0, };
845 GstV4l2VideoDecCData *cdata;
847 cdata = g_new0 (GstV4l2VideoDecCData, 1);
848 cdata->device = g_strdup (device_path);
849 cdata->sink_caps = gst_caps_ref (sink_caps);
850 cdata->src_caps = gst_caps_ref (src_caps);
852 type = gst_v4l2_video_dec_get_type ();
853 g_type_query (type, &type_query);
854 memset (&type_info, 0, sizeof (type_info));
855 type_info.class_size = type_query.class_size;
856 type_info.instance_size = type_query.instance_size;
857 type_info.class_init = gst_v4l2_video_dec_subclass_init;
858 type_info.class_data = cdata;
859 type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
861 type_name = g_strdup_printf ("v4l2%sdec", basename);
862 subtype = g_type_register_static (type, type_name, &type_info, 0);
864 gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);