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);
93 case PROP_OUTPUT_IO_MODE:
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->v4l2capture, prop_id, value,
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_decoder_cmd (GstV4l2Object * v4l2object, guint cmd, guint flags)
299 struct v4l2_decoder_cmd dcmd = { 0, };
301 GST_DEBUG_OBJECT (v4l2object->element,
302 "sending v4l2 decoder command %u with flags %u", cmd, flags);
304 if (!GST_V4L2_IS_OPEN (v4l2object))
309 if (v4l2_ioctl (v4l2object->video_fd, VIDIOC_DECODER_CMD, &dcmd) < 0)
315 if (errno == ENOTTY) {
316 GST_INFO_OBJECT (v4l2object->element,
317 "Failed to send decoder command %u with flags %u for '%s'. (%s)",
318 cmd, flags, v4l2object->videodev, g_strerror (errno));
320 GST_ERROR_OBJECT (v4l2object->element,
321 "Failed to send decoder command %u with flags %u for '%s'. (%s)",
322 cmd, flags, v4l2object->videodev, g_strerror (errno));
328 gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
330 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
331 GstFlowReturn ret = GST_FLOW_OK;
334 if (!g_atomic_int_get (&self->processing))
337 GST_DEBUG_OBJECT (self, "Finishing decoding");
339 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
341 if (gst_v4l2_decoder_cmd (self->v4l2output, V4L2_DEC_CMD_STOP, 0)) {
342 GstTask *task = decoder->srcpad->task;
344 /* If the decoder stop command succeeded, just wait until processing is
346 GST_OBJECT_LOCK (task);
347 while (GST_TASK_STATE (task) == GST_TASK_STARTED)
348 GST_TASK_WAIT (task);
349 GST_OBJECT_UNLOCK (task);
350 ret = GST_FLOW_FLUSHING;
352 /* otherwise keep queuing empty buffers until the processing thread has
353 * stopped, _pool_process() will return FLUSHING when that happened */
354 while (ret == GST_FLOW_OK) {
355 buffer = gst_buffer_new ();
357 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
358 v4l2output->pool), &buffer);
359 gst_buffer_unref (buffer);
363 /* and ensure the processing thread has stopped in case another error
365 gst_v4l2_object_unlock (self->v4l2capture);
366 gst_pad_stop_task (decoder->srcpad);
367 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
369 if (ret == GST_FLOW_FLUSHING)
370 ret = self->output_flow;
372 GST_DEBUG_OBJECT (decoder, "Done draining buffers");
378 static GstVideoCodecFrame *
379 gst_v4l2_video_dec_get_oldest_frame (GstVideoDecoder * decoder)
381 GstVideoCodecFrame *frame = NULL;
385 frames = gst_video_decoder_get_frames (decoder);
387 for (l = frames; l != NULL; l = l->next) {
388 GstVideoCodecFrame *f = l->data;
390 if (!frame || frame->pts > f->pts)
397 GST_LOG_OBJECT (decoder,
398 "Oldest frame is %d %" GST_TIME_FORMAT " and %d frames left",
399 frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
400 gst_video_codec_frame_ref (frame);
403 g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
409 gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
411 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
412 GstV4l2BufferPool *v4l2_pool = GST_V4L2_BUFFER_POOL (self->v4l2capture->pool);
414 GstVideoCodecFrame *frame;
415 GstBuffer *buffer = NULL;
418 GST_LOG_OBJECT (decoder, "Allocate output buffer");
421 /* We cannot use the base class allotate helper since it taking the internal
422 * stream lock. we know that the acquire may need to poll until more frames
423 * comes in and holding this lock would prevent that.
425 pool = gst_video_decoder_get_buffer_pool (decoder);
427 /* Pool may be NULL if we started going to READY state */
429 ret = GST_FLOW_FLUSHING;
433 ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
434 g_object_unref (pool);
436 if (ret != GST_FLOW_OK)
439 GST_LOG_OBJECT (decoder, "Process output buffer");
440 ret = gst_v4l2_buffer_pool_process (v4l2_pool, &buffer);
442 } while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER);
444 if (ret != GST_FLOW_OK)
447 frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
450 frame->output_buffer = buffer;
452 ret = gst_video_decoder_finish_frame (decoder, frame);
454 if (ret != GST_FLOW_OK)
457 GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers");
458 gst_buffer_unref (buffer);
464 GST_DEBUG_OBJECT (decoder, "Leaving output thread: %s",
465 gst_flow_get_name (ret));
467 gst_buffer_replace (&buffer, NULL);
468 self->output_flow = ret;
469 g_atomic_int_set (&self->processing, FALSE);
470 gst_v4l2_object_unlock (self->v4l2output);
471 gst_pad_pause_task (decoder->srcpad);
475 gst_v4l2_video_dec_loop_stopped (GstV4l2VideoDec * self)
477 /* When flushing, decoding thread may never run */
478 if (g_atomic_int_get (&self->processing)) {
479 GST_DEBUG_OBJECT (self, "Early stop of decoding thread");
480 self->output_flow = GST_FLOW_FLUSHING;
481 g_atomic_int_set (&self->processing, FALSE);
484 GST_DEBUG_OBJECT (self, "Decoding task destroyed: %s",
485 gst_flow_get_name (self->output_flow));
489 gst_v4l2_video_remove_padding(GstCapsFeatures * features,
490 GstStructure * structure, gpointer user_data)
492 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (user_data);
493 GstVideoAlignment *align = &self->v4l2capture->align;
494 GstVideoInfo *info = &self->v4l2capture->info;
497 if (!gst_structure_get_int(structure, "width", &width))
500 if (!gst_structure_get_int(structure, "height", &height))
503 if (align->padding_left != 0 || align->padding_top != 0 ||
504 width != info->width + align->padding_right ||
505 height != info->height + align->padding_bottom)
508 gst_structure_set(structure,
509 "width", G_TYPE_INT, width - align->padding_right,
510 "height", G_TYPE_INT, height - align->padding_bottom, NULL);
516 gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
517 GstVideoCodecFrame * frame)
519 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
520 GstFlowReturn ret = GST_FLOW_OK;
522 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
524 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
527 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
528 if (!self->input_state)
530 if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps))
534 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
535 GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
537 GstVideoCodecState *output_state;
538 GstBuffer *codec_data;
539 GstCaps *acquired_caps, *available_caps, *caps, *filter;
542 GST_DEBUG_OBJECT (self, "Sending header");
544 codec_data = self->input_state->codec_data;
546 /* We are running in byte-stream mode, so we don't know the headers, but
547 * we need to send something, otherwise the decoder will refuse to
551 gst_buffer_ref (codec_data);
553 codec_data = frame->input_buffer;
554 frame->input_buffer = NULL;
557 /* Ensure input internal pool is active */
558 if (!gst_buffer_pool_is_active (pool)) {
559 GstStructure *config = gst_buffer_pool_get_config (pool);
560 gst_buffer_pool_config_set_params (config, self->input_state->caps,
561 self->v4l2output->info.size, 2, 2);
563 /* There is no reason to refuse this config */
564 if (!gst_buffer_pool_set_config (pool, config))
565 goto activate_failed;
567 if (!gst_buffer_pool_set_active (pool, TRUE))
568 goto activate_failed;
571 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
573 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
574 v4l2output->pool), &codec_data);
575 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
577 gst_buffer_unref (codec_data);
579 /* For decoders G_FMT returns coded size, G_SELECTION returns visible size
580 * in the compose rectangle. gst_v4l2_object_acquire_format() checks both
581 * and returns the visible size as with/height and the coded size as
583 if (!gst_v4l2_object_acquire_format (self->v4l2capture, &info))
586 /* Create caps from the acquired format, remove the format field */
587 acquired_caps = gst_video_info_to_caps (&info);
588 st = gst_caps_get_structure (acquired_caps, 0);
589 gst_structure_remove_field (st, "format");
591 /* Probe currently available pixel formats */
592 available_caps = gst_v4l2_object_probe_caps (self->v4l2capture, NULL);
593 available_caps = gst_caps_make_writable (available_caps);
595 /* Replace coded size with visible size, we want to negotiate visible size
596 * with downstream, not coded size. */
597 gst_caps_map_in_place (available_caps, gst_v4l2_video_remove_padding, self);
599 filter = gst_caps_intersect_full (available_caps, acquired_caps,
600 GST_CAPS_INTERSECT_FIRST);
601 gst_caps_unref (acquired_caps);
602 gst_caps_unref (available_caps);
603 caps = gst_pad_peer_query_caps (decoder->srcpad, filter);
604 gst_caps_unref (filter);
606 GST_DEBUG_OBJECT (self, "Possible decoded caps: %" GST_PTR_FORMAT, caps);
607 if (gst_caps_is_empty (caps)) {
608 gst_caps_unref (caps);
612 /* Fixate pixel format */
613 caps = gst_caps_fixate (caps);
615 GST_DEBUG_OBJECT (self, "Chosen decoded caps: %" GST_PTR_FORMAT, caps);
617 /* Try to set negotiated format, on success replace acquired format */
618 if (gst_v4l2_object_set_format (self->v4l2capture, caps))
619 gst_video_info_from_caps (&info, caps);
620 gst_caps_unref (caps);
622 output_state = gst_video_decoder_set_output_state (decoder,
623 info.finfo->format, info.width, info.height, self->input_state);
625 /* Copy the rest of the information, there might be more in the future */
626 output_state->info.interlace_mode = info.interlace_mode;
627 gst_video_codec_state_unref (output_state);
629 if (!gst_video_decoder_negotiate (decoder)) {
630 if (GST_PAD_IS_FLUSHING (decoder->srcpad))
636 /* Ensure our internal pool is activated */
637 if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
639 goto activate_failed;
642 if (g_atomic_int_get (&self->processing) == FALSE) {
643 /* It's possible that the processing thread stopped due to an error */
644 if (self->output_flow != GST_FLOW_OK &&
645 self->output_flow != GST_FLOW_FLUSHING) {
646 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
647 ret = self->output_flow;
651 GST_DEBUG_OBJECT (self, "Starting decoding thread");
653 /* Start the processing task, when it quits, the task will disable input
654 * processing to unlock input if draining, or prevent potential block */
655 g_atomic_int_set (&self->processing, TRUE);
656 if (!gst_pad_start_task (decoder->srcpad,
657 (GstTaskFunction) gst_v4l2_video_dec_loop, self,
658 (GDestroyNotify) gst_v4l2_video_dec_loop_stopped))
659 goto start_task_failed;
662 if (frame->input_buffer) {
663 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
665 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
666 pool), &frame->input_buffer);
667 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
669 if (ret == GST_FLOW_FLUSHING) {
670 if (g_atomic_int_get (&self->processing) == FALSE)
671 ret = self->output_flow;
673 } else if (ret != GST_FLOW_OK) {
677 /* No need to keep input arround */
678 gst_buffer_replace (&frame->input_buffer, NULL);
681 gst_video_codec_frame_unref (frame);
687 GST_ERROR_OBJECT (self, "not negotiated");
688 ret = GST_FLOW_NOT_NEGOTIATED;
693 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
694 (_("Failed to allocate required memory.")),
695 ("Buffer pool activation failed"));
696 ret = GST_FLOW_ERROR;
701 ret = GST_FLOW_FLUSHING;
707 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
708 (_("Failed to start decoding thread.")), (NULL));
709 g_atomic_int_set (&self->processing, FALSE);
710 ret = GST_FLOW_ERROR;
715 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
716 (_("Failed to process frame.")),
717 ("Maybe be due to not enough memory or failing driver"));
718 ret = GST_FLOW_ERROR;
723 gst_video_decoder_drop_frame (decoder, frame);
729 gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
732 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
733 GstClockTime latency;
734 gboolean ret = FALSE;
736 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
737 ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
740 latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
741 gst_video_decoder_set_latency (decoder, latency, latency);
747 gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
750 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
752 switch (GST_QUERY_TYPE (query)) {
753 case GST_QUERY_CAPS:{
754 GstCaps *filter, *result = NULL;
755 GstPad *pad = GST_VIDEO_DECODER_SRC_PAD (decoder);
757 gst_query_parse_caps (query, &filter);
759 if (self->probed_srccaps)
760 result = gst_caps_ref (self->probed_srccaps);
762 result = gst_pad_get_pad_template_caps (pad);
765 GstCaps *tmp = result;
767 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
768 gst_caps_unref (tmp);
771 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
773 gst_query_set_caps_result (query, result);
774 gst_caps_unref (result);
779 ret = GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
787 gst_v4l2_video_dec_sink_getcaps (GstVideoDecoder * decoder, GstCaps * filter)
789 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
792 result = gst_video_decoder_proxy_getcaps (decoder, self->probed_sinkcaps,
795 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
801 gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
803 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
806 switch (GST_EVENT_TYPE (event)) {
807 case GST_EVENT_FLUSH_START:
808 GST_DEBUG_OBJECT (self, "flush start");
809 gst_v4l2_object_unlock (self->v4l2output);
810 gst_v4l2_object_unlock (self->v4l2capture);
816 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
818 switch (GST_EVENT_TYPE (event)) {
819 case GST_EVENT_FLUSH_START:
820 /* The processing thread should stop now, wait for it */
821 gst_pad_stop_task (decoder->srcpad);
822 GST_DEBUG_OBJECT (self, "flush start done");
831 static GstStateChangeReturn
832 gst_v4l2_video_dec_change_state (GstElement * element,
833 GstStateChange transition)
835 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
836 GstVideoDecoder *decoder = GST_VIDEO_DECODER (element);
838 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
839 g_atomic_int_set (&self->active, FALSE);
840 gst_v4l2_object_unlock (self->v4l2output);
841 gst_v4l2_object_unlock (self->v4l2capture);
842 gst_pad_stop_task (decoder->srcpad);
845 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
849 gst_v4l2_video_dec_dispose (GObject * object)
851 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
853 gst_caps_replace (&self->probed_sinkcaps, NULL);
854 gst_caps_replace (&self->probed_srccaps, NULL);
856 G_OBJECT_CLASS (parent_class)->dispose (object);
860 gst_v4l2_video_dec_finalize (GObject * object)
862 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
864 gst_v4l2_object_destroy (self->v4l2capture);
865 gst_v4l2_object_destroy (self->v4l2output);
867 G_OBJECT_CLASS (parent_class)->finalize (object);
871 gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
873 /* V4L2 object are created in subinstance_init */
877 gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
879 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
880 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
881 GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);
883 gst_video_decoder_set_packetized (decoder, TRUE);
885 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
886 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
887 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
888 self->v4l2output->no_initial_format = TRUE;
889 self->v4l2output->keep_aspect = FALSE;
891 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
892 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
893 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
894 self->v4l2capture->no_initial_format = TRUE;
895 self->v4l2output->keep_aspect = FALSE;
899 gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
901 GstElementClass *element_class;
902 GObjectClass *gobject_class;
903 GstVideoDecoderClass *video_decoder_class;
905 parent_class = g_type_class_peek_parent (klass);
907 element_class = (GstElementClass *) klass;
908 gobject_class = (GObjectClass *) klass;
909 video_decoder_class = (GstVideoDecoderClass *) klass;
911 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
912 "V4L2 Video Decoder");
914 gst_element_class_set_static_metadata (element_class,
915 "V4L2 Video Decoder",
916 "Codec/Decoder/Video",
917 "Decode video streams via V4L2 API",
918 "Nicolas Dufresne <nicolas.dufresne@collabora.co.uk>");
920 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
921 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
922 gobject_class->set_property =
923 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
924 gobject_class->get_property =
925 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
927 video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
928 video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
929 video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
930 video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
931 video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
932 video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
933 video_decoder_class->set_format =
934 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
935 video_decoder_class->negotiate =
936 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
937 video_decoder_class->decide_allocation =
938 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
939 /* FIXME propose_allocation or not ? */
940 video_decoder_class->handle_frame =
941 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
942 video_decoder_class->getcaps =
943 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_getcaps);
944 video_decoder_class->src_query =
945 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
946 video_decoder_class->sink_event =
947 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
949 element_class->change_state =
950 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
952 gst_v4l2_object_install_m2m_properties_helper (gobject_class);
956 gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
958 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
959 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
960 GstV4l2VideoDecCData *cdata = data;
962 klass->default_device = cdata->device;
964 /* Note: gst_pad_template_new() take the floating ref from the caps */
965 gst_element_class_add_pad_template (element_class,
966 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
968 gst_element_class_add_pad_template (element_class,
969 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
975 /* Probing functions */
977 gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
979 gboolean ret = FALSE;
981 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ())
982 && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
989 gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
990 const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
992 GTypeQuery type_query;
993 GTypeInfo type_info = { 0, };
996 GstV4l2VideoDecCData *cdata;
998 cdata = g_new0 (GstV4l2VideoDecCData, 1);
999 cdata->device = g_strdup (device_path);
1000 cdata->sink_caps = gst_caps_ref (sink_caps);
1001 cdata->src_caps = gst_caps_ref (src_caps);
1003 type = gst_v4l2_video_dec_get_type ();
1004 g_type_query (type, &type_query);
1005 memset (&type_info, 0, sizeof (type_info));
1006 type_info.class_size = type_query.class_size;
1007 type_info.instance_size = type_query.instance_size;
1008 type_info.class_init = gst_v4l2_video_dec_subclass_init;
1009 type_info.class_data = cdata;
1010 type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
1012 type_name = g_strdup_printf ("v4l2%sdec", basename);
1013 subtype = g_type_register_static (type, type_name, &type_info, 0);
1015 gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype);