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 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
288 /* We don't allow renegotiation without carefull disabling the pool */
289 if (self->v4l2capture->pool &&
290 gst_buffer_pool_is_active (GST_BUFFER_POOL (self->v4l2capture->pool)))
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 (!g_atomic_int_get (&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);
319 /* and ensure the processing thread has stopped in case another error
321 gst_v4l2_object_unlock (self->v4l2capture);
322 gst_pad_stop_task (decoder->srcpad);
323 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
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);
368 GstV4l2BufferPool *v4l2_pool = GST_V4L2_BUFFER_POOL (self->v4l2capture->pool);
370 GstVideoCodecFrame *frame;
371 GstBuffer *buffer = NULL;
374 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");
396 ret = gst_v4l2_buffer_pool_process (v4l2_pool, &buffer);
398 } while (ret == GST_V4L2_FLOW_CORRUPTED_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: %s",
421 gst_flow_get_name (ret));
423 gst_buffer_replace (&buffer, NULL);
424 self->output_flow = ret;
425 g_atomic_int_set (&self->processing, FALSE);
426 gst_v4l2_object_unlock (self->v4l2output);
427 gst_pad_pause_task (decoder->srcpad);
431 gst_v4l2_video_dec_loop_stopped (GstV4l2VideoDec * self)
433 /* When flushing, decoding thread may never run */
434 if (g_atomic_int_get (&self->processing)) {
435 GST_DEBUG_OBJECT (self, "Early stop of decoding thread");
436 self->output_flow = GST_FLOW_FLUSHING;
437 g_atomic_int_set (&self->processing, FALSE);
440 GST_DEBUG_OBJECT (self, "Decoding task destroyed: %s",
441 gst_flow_get_name (self->output_flow));
445 gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
446 GstVideoCodecFrame * frame)
448 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
449 GstFlowReturn ret = GST_FLOW_OK;
451 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
453 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
456 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
457 if (!self->input_state)
459 if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
463 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
464 GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
466 GstVideoCodecState *output_state;
467 GstBuffer *codec_data;
469 GST_DEBUG_OBJECT (self, "Sending header");
471 codec_data = self->input_state->codec_data;
473 /* We are running in byte-stream mode, so we don't know the headers, but
474 * we need to send something, otherwise the decoder will refuse to
478 gst_buffer_ref (codec_data);
480 codec_data = frame->input_buffer;
481 frame->input_buffer = NULL;
484 /* Ensure input internal pool is active */
485 if (!gst_buffer_pool_is_active (pool)) {
486 GstStructure *config = gst_buffer_pool_get_config (pool);
487 gst_buffer_pool_config_set_params (config, self->input_state->caps,
488 self->v4l2output->info.size, 2, 2);
490 /* There is no reason to refuse this config */
491 if (!gst_buffer_pool_set_config (pool, config))
492 goto activate_failed;
494 if (!gst_buffer_pool_set_active (pool, TRUE))
495 goto activate_failed;
498 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
500 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
501 v4l2output->pool), &codec_data);
502 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
504 gst_buffer_unref (codec_data);
506 if (!gst_v4l2_object_acquire_format (self->v4l2capture, &info))
509 output_state = gst_video_decoder_set_output_state (decoder,
510 info.finfo->format, info.width, info.height, self->input_state);
512 /* Copy the rest of the information, there might be more in the future */
513 output_state->info.interlace_mode = info.interlace_mode;
514 gst_video_codec_state_unref (output_state);
516 if (!gst_video_decoder_negotiate (decoder)) {
517 if (GST_PAD_IS_FLUSHING (decoder->srcpad))
523 /* Ensure our internal pool is activated */
524 if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
526 goto activate_failed;
529 if (g_atomic_int_get (&self->processing) == FALSE) {
530 /* It's possible that the processing thread stopped due to an error */
531 if (self->output_flow != GST_FLOW_OK &&
532 self->output_flow != GST_FLOW_FLUSHING) {
533 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
534 ret = self->output_flow;
538 GST_DEBUG_OBJECT (self, "Starting decoding thread");
540 /* Start the processing task, when it quits, the task will disable input
541 * processing to unlock input if draining, or prevent potential block */
542 g_atomic_int_set (&self->processing, TRUE);
543 if (!gst_pad_start_task (decoder->srcpad,
544 (GstTaskFunction) gst_v4l2_video_dec_loop, self,
545 (GDestroyNotify) gst_v4l2_video_dec_loop_stopped))
546 goto start_task_failed;
549 if (frame->input_buffer) {
550 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
552 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
553 pool), &frame->input_buffer);
554 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
556 if (ret == GST_FLOW_FLUSHING) {
557 if (g_atomic_int_get (&self->processing) == FALSE)
558 ret = self->output_flow;
560 } else if (ret != GST_FLOW_OK) {
564 /* No need to keep input arround */
565 gst_buffer_replace (&frame->input_buffer, NULL);
568 gst_video_codec_frame_unref (frame);
574 GST_ERROR_OBJECT (self, "not negotiated");
575 ret = GST_FLOW_NOT_NEGOTIATED;
580 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
581 (_("Failed to allocate required memory.")),
582 ("Buffer pool activation failed"));
583 ret = GST_FLOW_ERROR;
588 ret = GST_FLOW_FLUSHING;
594 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
595 (_("Failed to start decoding thread.")), (NULL));
596 g_atomic_int_set (&self->processing, FALSE);
597 ret = GST_FLOW_ERROR;
602 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
603 (_("Failed to process frame.")),
604 ("Maybe be due to not enough memory or failing driver"));
605 ret = GST_FLOW_ERROR;
610 gst_video_decoder_drop_frame (decoder, frame);
616 gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
619 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
620 GstClockTime latency;
621 gboolean ret = FALSE;
623 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
624 ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
627 latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
628 gst_video_decoder_set_latency (decoder, latency, latency);
634 gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
637 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
639 switch (GST_QUERY_TYPE (query)) {
640 case GST_QUERY_CAPS:{
641 GstCaps *filter, *result = NULL;
642 GstPad *pad = GST_VIDEO_DECODER_SRC_PAD (decoder);
644 gst_query_parse_caps (query, &filter);
646 if (self->probed_srccaps)
647 result = gst_caps_ref (self->probed_srccaps);
649 result = gst_pad_get_pad_template_caps (pad);
652 GstCaps *tmp = result;
654 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
655 gst_caps_unref (tmp);
658 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
660 gst_query_set_caps_result (query, result);
661 gst_caps_unref (result);
666 ret = GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
674 gst_v4l2_video_dec_sink_query (GstVideoDecoder * decoder, GstQuery * query)
677 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
679 switch (GST_QUERY_TYPE (query)) {
680 case GST_QUERY_CAPS:{
681 GstCaps *filter, *result = NULL;
682 GstPad *pad = GST_VIDEO_DECODER_SINK_PAD (decoder);
683 gst_query_parse_caps (query, &filter);
685 if (self->probed_sinkcaps)
686 result = gst_caps_ref (self->probed_sinkcaps);
688 result = gst_pad_get_pad_template_caps (pad);
691 GstCaps *tmp = result;
693 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
694 gst_caps_unref (tmp);
697 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
699 gst_query_set_caps_result (query, result);
700 gst_caps_unref (result);
705 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_query (decoder, query);
713 gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
715 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
718 switch (GST_EVENT_TYPE (event)) {
719 case GST_EVENT_FLUSH_START:
720 GST_DEBUG_OBJECT (self, "flush start");
721 gst_v4l2_object_unlock (self->v4l2output);
722 gst_v4l2_object_unlock (self->v4l2capture);
728 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
730 switch (GST_EVENT_TYPE (event)) {
731 case GST_EVENT_FLUSH_START:
732 /* The processing thread should stop now, wait for it */
733 gst_pad_stop_task (decoder->srcpad);
734 GST_DEBUG_OBJECT (self, "flush start done");
743 static GstStateChangeReturn
744 gst_v4l2_video_dec_change_state (GstElement * element,
745 GstStateChange transition)
747 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
748 GstVideoDecoder *decoder = GST_VIDEO_DECODER (element);
750 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
751 g_atomic_int_set (&self->active, FALSE);
752 gst_v4l2_object_unlock (self->v4l2output);
753 gst_v4l2_object_unlock (self->v4l2capture);
754 gst_pad_stop_task (decoder->srcpad);
757 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
761 gst_v4l2_video_dec_dispose (GObject * object)
763 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
765 gst_caps_replace (&self->probed_sinkcaps, NULL);
766 gst_caps_replace (&self->probed_srccaps, NULL);
768 G_OBJECT_CLASS (parent_class)->dispose (object);
772 gst_v4l2_video_dec_finalize (GObject * object)
774 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
776 gst_v4l2_object_destroy (self->v4l2capture);
777 gst_v4l2_object_destroy (self->v4l2output);
779 G_OBJECT_CLASS (parent_class)->finalize (object);
783 gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
785 /* V4L2 object are created in subinstance_init */
789 gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
791 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
792 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
793 GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);
795 gst_video_decoder_set_packetized (decoder, TRUE);
797 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
798 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
799 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
800 self->v4l2output->no_initial_format = TRUE;
801 self->v4l2output->keep_aspect = FALSE;
803 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
804 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
805 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
806 self->v4l2capture->no_initial_format = TRUE;
807 self->v4l2output->keep_aspect = FALSE;
811 gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
813 GstElementClass *element_class;
814 GObjectClass *gobject_class;
815 GstVideoDecoderClass *video_decoder_class;
817 parent_class = g_type_class_peek_parent (klass);
819 element_class = (GstElementClass *) klass;
820 gobject_class = (GObjectClass *) klass;
821 video_decoder_class = (GstVideoDecoderClass *) klass;
823 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
824 "V4L2 Video Decoder");
826 gst_element_class_set_static_metadata (element_class,
827 "V4L2 Video Decoder",
828 "Codec/Decoder/Video",
829 "Decode video streams via V4L2 API",
830 "Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
832 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
833 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
834 gobject_class->set_property =
835 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
836 gobject_class->get_property =
837 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
839 video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
840 video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
841 video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
842 video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
843 video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
844 video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
845 video_decoder_class->set_format =
846 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
847 video_decoder_class->negotiate =
848 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
849 video_decoder_class->decide_allocation =
850 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
851 /* FIXME propose_allocation or not ? */
852 video_decoder_class->handle_frame =
853 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
854 video_decoder_class->sink_query =
855 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_query);
856 video_decoder_class->src_query =
857 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
858 video_decoder_class->sink_event =
859 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
861 element_class->change_state =
862 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
864 gst_v4l2_object_install_m2m_properties_helper (gobject_class);
868 gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
870 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
871 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
872 GstV4l2VideoDecCData *cdata = data;
874 klass->default_device = cdata->device;
876 /* Note: gst_pad_template_new() take the floating ref from the caps */
877 gst_element_class_add_pad_template (element_class,
878 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
880 gst_element_class_add_pad_template (element_class,
881 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
887 /* Probing functions */
889 gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
891 gboolean ret = FALSE;
893 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ())
894 && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
901 gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
902 const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
904 GTypeQuery type_query;
905 GTypeInfo type_info = { 0, };
908 GstV4l2VideoDecCData *cdata;
910 cdata = g_new0 (GstV4l2VideoDecCData, 1);
911 cdata->device = g_strdup (device_path);
912 cdata->sink_caps = gst_caps_ref (sink_caps);
913 cdata->src_caps = gst_caps_ref (src_caps);
915 type = gst_v4l2_video_dec_get_type ();
916 g_type_query (type, &type_query);
917 memset (&type_info, 0, sizeof (type_info));
918 type_info.class_size = type_query.class_size;
919 type_info.instance_size = type_query.instance_size;
920 type_info.class_init = gst_v4l2_video_dec_subclass_init;
921 type_info.class_data = cdata;
922 type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
924 type_name = g_strdup_printf ("v4l2%sdec", basename);
925 subtype = g_type_register_static (type, type_name, &type_info, 0);
927 gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);