2 * Copyright (C) 2014 Collabora Ltd.
3 * Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
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 "gstv4l2object.h"
33 #include "gstv4l2videodec.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
46 const gchar *longname;
47 const gchar *description;
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);
60 static GstFlowReturn gst_v4l2_video_dec_finish (GstVideoDecoder * decoder);
63 gst_v4l2_video_dec_set_property (GObject * object,
64 guint prop_id, const GValue * value, GParamSpec * pspec)
66 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
69 case PROP_CAPTURE_IO_MODE:
70 if (!gst_v4l2_object_set_property_helper (self->v4l2capture,
71 prop_id, value, pspec)) {
72 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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_CAPTURE_IO_MODE:
94 if (!gst_v4l2_object_get_property_helper (self->v4l2capture,
95 prop_id, value, pspec)) {
96 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
100 /* By default read from output */
102 if (!gst_v4l2_object_get_property_helper (self->v4l2output,
103 prop_id, value, pspec)) {
104 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
111 gst_v4l2_video_dec_open (GstVideoDecoder * decoder)
113 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
116 GST_DEBUG_OBJECT (self, "Opening");
118 if (!gst_v4l2_object_open (self->v4l2output))
121 if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
124 codec_caps = gst_pad_get_pad_template_caps (decoder->sinkpad);
125 self->probed_sinkcaps = gst_v4l2_object_probe_caps (self->v4l2output,
127 gst_caps_unref (codec_caps);
129 if (gst_caps_is_empty (self->probed_sinkcaps))
130 goto no_encoded_format;
135 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
136 (_("Decoder on device %s has no supported input format"),
137 self->v4l2output->videodev), (NULL));
141 if (GST_V4L2_IS_OPEN (self->v4l2output))
142 gst_v4l2_object_close (self->v4l2output);
144 if (GST_V4L2_IS_OPEN (self->v4l2capture))
145 gst_v4l2_object_close (self->v4l2capture);
147 gst_caps_replace (&self->probed_srccaps, NULL);
148 gst_caps_replace (&self->probed_sinkcaps, NULL);
154 gst_v4l2_video_dec_close (GstVideoDecoder * decoder)
156 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
158 GST_DEBUG_OBJECT (self, "Closing");
160 gst_v4l2_object_close (self->v4l2output);
161 gst_v4l2_object_close (self->v4l2capture);
162 gst_caps_replace (&self->probed_srccaps, NULL);
163 gst_caps_replace (&self->probed_sinkcaps, NULL);
169 gst_v4l2_video_dec_start (GstVideoDecoder * decoder)
171 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
173 GST_DEBUG_OBJECT (self, "Starting");
175 gst_v4l2_object_unlock (self->v4l2output);
176 g_atomic_int_set (&self->active, TRUE);
177 self->output_flow = GST_FLOW_OK;
183 gst_v4l2_video_dec_stop (GstVideoDecoder * decoder)
185 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
187 GST_DEBUG_OBJECT (self, "Stopping");
189 gst_v4l2_object_unlock (self->v4l2output);
190 gst_v4l2_object_unlock (self->v4l2capture);
192 /* Wait for capture thread to stop */
193 gst_pad_stop_task (decoder->srcpad);
195 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
196 self->output_flow = GST_FLOW_OK;
197 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
199 /* Should have been flushed already */
200 g_assert (g_atomic_int_get (&self->active) == FALSE);
202 gst_v4l2_object_stop (self->v4l2output);
203 gst_v4l2_object_stop (self->v4l2capture);
205 if (self->input_state) {
206 gst_video_codec_state_unref (self->input_state);
207 self->input_state = NULL;
210 GST_DEBUG_OBJECT (self, "Stopped");
216 gst_v4l2_video_dec_set_format (GstVideoDecoder * decoder,
217 GstVideoCodecState * state)
219 GstV4l2Error error = GST_V4L2_ERROR_INIT;
221 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
223 GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
225 if (self->input_state) {
226 if (gst_v4l2_object_caps_equal (self->v4l2output, state->caps)) {
227 GST_DEBUG_OBJECT (self, "Compatible caps");
230 gst_video_codec_state_unref (self->input_state);
231 self->input_state = NULL;
233 gst_v4l2_video_dec_finish (decoder);
234 gst_v4l2_object_stop (self->v4l2output);
236 /* The renegotiation flow don't blend with the base class flow. To
237 * properly stop the capture pool we need to reclaim our buffers, which
238 * will happend through the allocation query. The allocation query is
239 * triggered by gst_video_decoder_negotiate() which requires the output
240 * caps to be set, but we can't know this information as we rely on the
241 * decoder, which requires the capture queue to be stopped.
243 * To workaround this issue, we simply run an allocation query with the
244 * old negotiated caps in order to drain/reclaim our buffers. That breaks
245 * the complexity and should not have much impact in performance since the
246 * following allocation query will happen on a drained pipeline and won't
249 GstCaps *caps = gst_pad_get_current_caps (decoder->srcpad);
251 GstQuery *query = gst_query_new_allocation (caps, FALSE);
252 gst_pad_peer_query (decoder->srcpad, query);
253 gst_query_unref (query);
254 gst_caps_unref (caps);
258 gst_v4l2_object_stop (self->v4l2capture);
259 self->output_flow = GST_FLOW_OK;
262 ret = gst_v4l2_object_set_format (self->v4l2output, state->caps, &error);
264 gst_caps_replace (&self->probed_srccaps, NULL);
265 self->probed_srccaps = gst_v4l2_object_probe_caps (self->v4l2capture,
266 gst_v4l2_object_get_raw_caps ());
268 if (gst_caps_is_empty (self->probed_srccaps))
272 self->input_state = gst_video_codec_state_ref (state);
274 gst_v4l2_error (self, &error);
280 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
281 (_("Decoder on device %s has no supported output format"),
282 self->v4l2output->videodev), (NULL));
283 return GST_FLOW_ERROR;
287 gst_v4l2_video_dec_flush (GstVideoDecoder * decoder)
289 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
291 GST_DEBUG_OBJECT (self, "Flushed");
293 /* Ensure the processing thread has stopped for the reverse playback
295 if (gst_pad_get_task_state (decoder->srcpad) == GST_TASK_STARTED) {
296 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
298 gst_v4l2_object_unlock (self->v4l2output);
299 gst_v4l2_object_unlock (self->v4l2capture);
300 gst_pad_stop_task (decoder->srcpad);
301 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
304 self->output_flow = GST_FLOW_OK;
306 gst_v4l2_object_unlock_stop (self->v4l2output);
307 gst_v4l2_object_unlock_stop (self->v4l2capture);
309 if (self->v4l2output->pool)
310 gst_v4l2_buffer_pool_flush (self->v4l2output->pool);
312 /* gst_v4l2_buffer_pool_flush() calls streamon the capture pool and must be
313 * called after gst_v4l2_object_unlock_stop() stopped flushing the buffer
315 if (self->v4l2capture->pool)
316 gst_v4l2_buffer_pool_flush (self->v4l2capture->pool);
322 gst_v4l2_video_dec_negotiate (GstVideoDecoder * decoder)
324 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
326 /* We don't allow renegotiation without carefull disabling the pool */
327 if (self->v4l2capture->pool &&
328 gst_buffer_pool_is_active (GST_BUFFER_POOL (self->v4l2capture->pool)))
331 return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
335 gst_v4l2_decoder_cmd (GstV4l2Object * v4l2object, guint cmd, guint flags)
337 struct v4l2_decoder_cmd dcmd = { 0, };
339 GST_DEBUG_OBJECT (v4l2object->element,
340 "sending v4l2 decoder command %u with flags %u", cmd, flags);
342 if (!GST_V4L2_IS_OPEN (v4l2object))
347 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_DECODER_CMD, &dcmd) < 0)
353 if (errno == ENOTTY) {
354 GST_INFO_OBJECT (v4l2object->element,
355 "Failed to send decoder command %u with flags %u for '%s'. (%s)",
356 cmd, flags, v4l2object->videodev, g_strerror (errno));
358 GST_ERROR_OBJECT (v4l2object->element,
359 "Failed to send decoder command %u with flags %u for '%s'. (%s)",
360 cmd, flags, v4l2object->videodev, g_strerror (errno));
366 gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
368 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
369 GstFlowReturn ret = GST_FLOW_OK;
372 if (gst_pad_get_task_state (decoder->srcpad) != GST_TASK_STARTED)
375 GST_DEBUG_OBJECT (self, "Finishing decoding");
377 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
379 if (gst_v4l2_decoder_cmd (self->v4l2output, V4L2_DEC_CMD_STOP, 0)) {
380 GstTask *task = decoder->srcpad->task;
382 /* If the decoder stop command succeeded, just wait until processing is
384 GST_DEBUG_OBJECT (self, "Waiting for decoder stop");
385 GST_OBJECT_LOCK (task);
386 while (GST_TASK_STATE (task) == GST_TASK_STARTED)
387 GST_TASK_WAIT (task);
388 GST_OBJECT_UNLOCK (task);
389 ret = GST_FLOW_FLUSHING;
391 /* otherwise keep queuing empty buffers until the processing thread has
392 * stopped, _pool_process() will return FLUSHING when that happened */
393 while (ret == GST_FLOW_OK) {
394 buffer = gst_buffer_new ();
396 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
397 v4l2output->pool), &buffer);
398 gst_buffer_unref (buffer);
402 /* and ensure the processing thread has stopped in case another error
404 gst_v4l2_object_unlock (self->v4l2capture);
405 gst_pad_stop_task (decoder->srcpad);
406 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
408 if (ret == GST_FLOW_FLUSHING)
409 ret = self->output_flow;
411 GST_DEBUG_OBJECT (decoder, "Done draining buffers");
413 /* TODO Shall we cleanup any reffed frame to workaround broken decoders ? */
420 gst_v4l2_video_dec_drain (GstVideoDecoder * decoder)
422 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
424 GST_DEBUG_OBJECT (self, "Draining...");
425 gst_v4l2_video_dec_finish (decoder);
426 gst_v4l2_video_dec_flush (decoder);
431 static GstVideoCodecFrame *
432 gst_v4l2_video_dec_get_oldest_frame (GstVideoDecoder * decoder)
434 GstVideoCodecFrame *frame = NULL;
438 frames = gst_video_decoder_get_frames (decoder);
440 for (l = frames; l != NULL; l = l->next) {
441 GstVideoCodecFrame *f = l->data;
443 if (!frame || frame->pts > f->pts)
450 GST_LOG_OBJECT (decoder,
451 "Oldest frame is %d %" GST_TIME_FORMAT " and %d frames left",
452 frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
453 gst_video_codec_frame_ref (frame);
456 g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
462 gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
464 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
465 GstV4l2BufferPool *v4l2_pool = GST_V4L2_BUFFER_POOL (self->v4l2capture->pool);
467 GstVideoCodecFrame *frame;
468 GstBuffer *buffer = NULL;
471 GST_LOG_OBJECT (decoder, "Allocate output buffer");
473 self->output_flow = GST_FLOW_OK;
475 /* We cannot use the base class allotate helper since it taking the internal
476 * stream lock. we know that the acquire may need to poll until more frames
477 * comes in and holding this lock would prevent that.
479 pool = gst_video_decoder_get_buffer_pool (decoder);
481 /* Pool may be NULL if we started going to READY state */
483 ret = GST_FLOW_FLUSHING;
487 ret = gst_buffer_pool_acquire_buffer (pool, &buffer, NULL);
488 g_object_unref (pool);
490 if (ret != GST_FLOW_OK)
493 GST_LOG_OBJECT (decoder, "Process output buffer");
494 ret = gst_v4l2_buffer_pool_process (v4l2_pool, &buffer);
496 } while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER);
498 if (ret != GST_FLOW_OK)
501 frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
504 frame->output_buffer = buffer;
506 ret = gst_video_decoder_finish_frame (decoder, frame);
508 if (ret != GST_FLOW_OK)
511 GST_WARNING_OBJECT (decoder, "Decoder is producing too many buffers");
512 gst_buffer_unref (buffer);
518 GST_DEBUG_OBJECT (decoder, "Leaving output thread: %s",
519 gst_flow_get_name (ret));
521 gst_buffer_replace (&buffer, NULL);
522 self->output_flow = ret;
523 gst_v4l2_object_unlock (self->v4l2output);
524 gst_pad_pause_task (decoder->srcpad);
528 gst_v4l2_video_remove_padding (GstCapsFeatures * features,
529 GstStructure * structure, gpointer user_data)
531 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (user_data);
532 GstVideoAlignment *align = &self->v4l2capture->align;
533 GstVideoInfo *info = &self->v4l2capture->info;
536 if (!gst_structure_get_int (structure, "width", &width))
539 if (!gst_structure_get_int (structure, "height", &height))
542 if (align->padding_left != 0 || align->padding_top != 0 ||
543 height != info->height + align->padding_bottom)
546 if (height == info->height + align->padding_bottom) {
547 /* Some drivers may round up width to the padded with */
548 if (width == info->width + align->padding_right)
549 gst_structure_set (structure,
550 "width", G_TYPE_INT, width - align->padding_right,
551 "height", G_TYPE_INT, height - align->padding_bottom, NULL);
552 /* Some drivers may keep visible width and only round up bytesperline */
553 else if (width == info->width)
554 gst_structure_set (structure,
555 "height", G_TYPE_INT, height - align->padding_bottom, NULL);
562 gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
563 GstVideoCodecFrame * frame)
565 GstV4l2Error error = GST_V4L2_ERROR_INIT;
566 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
567 GstFlowReturn ret = GST_FLOW_OK;
568 gboolean processed = FALSE;
570 GstTaskState task_state;
572 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
574 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
577 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2output))) {
578 if (!self->input_state)
580 if (!gst_v4l2_object_set_format (self->v4l2output, self->input_state->caps,
585 if (G_UNLIKELY (!GST_V4L2_IS_ACTIVE (self->v4l2capture))) {
586 GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
588 GstVideoCodecState *output_state;
589 GstBuffer *codec_data;
590 GstCaps *acquired_caps, *available_caps, *caps, *filter;
593 GST_DEBUG_OBJECT (self, "Sending header");
595 codec_data = self->input_state->codec_data;
597 /* We are running in byte-stream mode, so we don't know the headers, but
598 * we need to send something, otherwise the decoder will refuse to
602 gst_buffer_ref (codec_data);
604 codec_data = gst_buffer_ref (frame->input_buffer);
608 /* Ensure input internal pool is active */
609 if (!gst_buffer_pool_is_active (pool)) {
610 GstStructure *config = gst_buffer_pool_get_config (pool);
611 gst_buffer_pool_config_set_params (config, self->input_state->caps,
612 self->v4l2output->info.size, 2, 2);
614 /* There is no reason to refuse this config */
615 if (!gst_buffer_pool_set_config (pool, config))
616 goto activate_failed;
618 if (!gst_buffer_pool_set_active (pool, TRUE))
619 goto activate_failed;
622 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
624 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
625 v4l2output->pool), &codec_data);
626 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
628 gst_buffer_unref (codec_data);
630 /* For decoders G_FMT returns coded size, G_SELECTION returns visible size
631 * in the compose rectangle. gst_v4l2_object_acquire_format() checks both
632 * and returns the visible size as with/height and the coded size as
634 if (!gst_v4l2_object_acquire_format (self->v4l2capture, &info))
637 /* Create caps from the acquired format, remove the format field */
638 acquired_caps = gst_video_info_to_caps (&info);
639 GST_DEBUG_OBJECT (self, "Acquired caps: %" GST_PTR_FORMAT, acquired_caps);
640 st = gst_caps_get_structure (acquired_caps, 0);
641 gst_structure_remove_fields (st, "format", "colorimetry", "chroma-site",
644 /* Probe currently available pixel formats */
645 available_caps = gst_caps_copy (self->probed_srccaps);
646 GST_DEBUG_OBJECT (self, "Available caps: %" GST_PTR_FORMAT, available_caps);
648 /* Replace coded size with visible size, we want to negotiate visible size
649 * with downstream, not coded size. */
650 gst_caps_map_in_place (available_caps, gst_v4l2_video_remove_padding, self);
652 filter = gst_caps_intersect_full (available_caps, acquired_caps,
653 GST_CAPS_INTERSECT_FIRST);
654 GST_DEBUG_OBJECT (self, "Filtered caps: %" GST_PTR_FORMAT, filter);
655 gst_caps_unref (acquired_caps);
656 gst_caps_unref (available_caps);
657 caps = gst_pad_peer_query_caps (decoder->srcpad, filter);
658 gst_caps_unref (filter);
660 GST_DEBUG_OBJECT (self, "Possible decoded caps: %" GST_PTR_FORMAT, caps);
661 if (gst_caps_is_empty (caps)) {
662 gst_caps_unref (caps);
666 /* Fixate pixel format */
667 caps = gst_caps_fixate (caps);
669 GST_DEBUG_OBJECT (self, "Chosen decoded caps: %" GST_PTR_FORMAT, caps);
671 /* Try to set negotiated format, on success replace acquired format */
672 if (gst_v4l2_object_set_format (self->v4l2capture, caps, &error))
673 gst_video_info_from_caps (&info, caps);
675 gst_v4l2_clear_error (&error);
676 gst_caps_unref (caps);
678 output_state = gst_video_decoder_set_output_state (decoder,
679 info.finfo->format, info.width, info.height, self->input_state);
681 /* Copy the rest of the information, there might be more in the future */
682 output_state->info.interlace_mode = info.interlace_mode;
683 gst_video_codec_state_unref (output_state);
685 if (!gst_video_decoder_negotiate (decoder)) {
686 if (GST_PAD_IS_FLUSHING (decoder->srcpad))
692 /* Ensure our internal pool is activated */
693 if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
695 goto activate_failed;
698 task_state = gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self));
699 if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED) {
700 /* It's possible that the processing thread stopped due to an error */
701 if (self->output_flow != GST_FLOW_OK &&
702 self->output_flow != GST_FLOW_FLUSHING) {
703 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
704 ret = self->output_flow;
708 GST_DEBUG_OBJECT (self, "Starting decoding thread");
710 /* Start the processing task, when it quits, the task will disable input
711 * processing to unlock input if draining, or prevent potential block */
712 self->output_flow = GST_FLOW_FLUSHING;
713 if (!gst_pad_start_task (decoder->srcpad,
714 (GstTaskFunction) gst_v4l2_video_dec_loop, self, NULL))
715 goto start_task_failed;
719 GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
721 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
722 pool), &frame->input_buffer);
723 GST_VIDEO_DECODER_STREAM_LOCK (decoder);
725 if (ret == GST_FLOW_FLUSHING) {
726 if (gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self)) !=
728 ret = self->output_flow;
730 } else if (ret != GST_FLOW_OK) {
735 /* No need to keep input arround */
736 tmp = frame->input_buffer;
737 frame->input_buffer = gst_buffer_new ();
738 gst_buffer_copy_into (frame->input_buffer, tmp,
739 GST_BUFFER_COPY_FLAGS | GST_BUFFER_COPY_TIMESTAMPS |
740 GST_BUFFER_COPY_META, 0, 0);
741 gst_buffer_unref (tmp);
743 gst_video_codec_frame_unref (frame);
749 GST_ERROR_OBJECT (self, "not negotiated");
750 ret = GST_FLOW_NOT_NEGOTIATED;
751 gst_v4l2_error (self, &error);
756 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
757 (_("Failed to allocate required memory.")),
758 ("Buffer pool activation failed"));
759 ret = GST_FLOW_ERROR;
764 ret = GST_FLOW_FLUSHING;
770 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
771 (_("Failed to start decoding thread.")), (NULL));
772 ret = GST_FLOW_ERROR;
777 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
778 (_("Failed to process frame.")),
779 ("Maybe be due to not enough memory or failing driver"));
780 ret = GST_FLOW_ERROR;
785 gst_video_decoder_drop_frame (decoder, frame);
791 gst_v4l2_video_dec_decide_allocation (GstVideoDecoder * decoder,
794 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
795 GstClockTime latency;
796 gboolean ret = FALSE;
798 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query))
799 ret = GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
802 if (GST_CLOCK_TIME_IS_VALID (self->v4l2capture->duration)) {
803 latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
804 GST_DEBUG_OBJECT (self, "Setting latency: %" GST_TIME_FORMAT " (%"
805 G_GUINT32_FORMAT " * %" G_GUINT64_FORMAT, GST_TIME_ARGS (latency),
806 self->v4l2capture->min_buffers, self->v4l2capture->duration);
807 gst_video_decoder_set_latency (decoder, latency, latency);
809 GST_WARNING_OBJECT (self, "Duration invalid, not setting latency");
816 gst_v4l2_video_dec_src_query (GstVideoDecoder * decoder, GstQuery * query)
819 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
821 switch (GST_QUERY_TYPE (query)) {
822 case GST_QUERY_CAPS:{
823 GstCaps *filter, *result = NULL;
824 GstPad *pad = GST_VIDEO_DECODER_SRC_PAD (decoder);
826 gst_query_parse_caps (query, &filter);
828 if (self->probed_srccaps)
829 result = gst_caps_ref (self->probed_srccaps);
831 result = gst_pad_get_pad_template_caps (pad);
834 GstCaps *tmp = result;
836 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
837 gst_caps_unref (tmp);
840 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
842 gst_query_set_caps_result (query, result);
843 gst_caps_unref (result);
848 ret = GST_VIDEO_DECODER_CLASS (parent_class)->src_query (decoder, query);
856 gst_v4l2_video_dec_sink_getcaps (GstVideoDecoder * decoder, GstCaps * filter)
858 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
861 result = gst_video_decoder_proxy_getcaps (decoder, self->probed_sinkcaps,
864 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
870 gst_v4l2_video_dec_sink_event (GstVideoDecoder * decoder, GstEvent * event)
872 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (decoder);
875 switch (GST_EVENT_TYPE (event)) {
876 case GST_EVENT_FLUSH_START:
877 GST_DEBUG_OBJECT (self, "flush start");
878 gst_v4l2_object_unlock (self->v4l2output);
879 gst_v4l2_object_unlock (self->v4l2capture);
885 ret = GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
887 switch (GST_EVENT_TYPE (event)) {
888 case GST_EVENT_FLUSH_START:
889 /* The processing thread should stop now, wait for it */
890 gst_pad_stop_task (decoder->srcpad);
891 GST_DEBUG_OBJECT (self, "flush start done");
900 static GstStateChangeReturn
901 gst_v4l2_video_dec_change_state (GstElement * element,
902 GstStateChange transition)
904 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (element);
905 GstVideoDecoder *decoder = GST_VIDEO_DECODER (element);
907 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
908 g_atomic_int_set (&self->active, FALSE);
909 gst_v4l2_object_unlock (self->v4l2output);
910 gst_v4l2_object_unlock (self->v4l2capture);
911 gst_pad_stop_task (decoder->srcpad);
914 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
918 gst_v4l2_video_dec_dispose (GObject * object)
920 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
922 gst_caps_replace (&self->probed_sinkcaps, NULL);
923 gst_caps_replace (&self->probed_srccaps, NULL);
925 G_OBJECT_CLASS (parent_class)->dispose (object);
929 gst_v4l2_video_dec_finalize (GObject * object)
931 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (object);
933 gst_v4l2_object_destroy (self->v4l2capture);
934 gst_v4l2_object_destroy (self->v4l2output);
936 G_OBJECT_CLASS (parent_class)->finalize (object);
940 gst_v4l2_video_dec_init (GstV4l2VideoDec * self)
942 /* V4L2 object are created in subinstance_init */
946 gst_v4l2_video_dec_subinstance_init (GTypeInstance * instance, gpointer g_class)
948 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
949 GstV4l2VideoDec *self = GST_V4L2_VIDEO_DEC (instance);
950 GstVideoDecoder *decoder = GST_VIDEO_DECODER (instance);
952 gst_video_decoder_set_packetized (decoder, TRUE);
954 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
955 GST_OBJECT (GST_VIDEO_DECODER_SINK_PAD (self)),
956 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
957 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
958 self->v4l2output->no_initial_format = TRUE;
959 self->v4l2output->keep_aspect = FALSE;
961 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
962 GST_OBJECT (GST_VIDEO_DECODER_SRC_PAD (self)),
963 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
964 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
968 gst_v4l2_video_dec_class_init (GstV4l2VideoDecClass * klass)
970 GstElementClass *element_class;
971 GObjectClass *gobject_class;
972 GstVideoDecoderClass *video_decoder_class;
974 parent_class = g_type_class_peek_parent (klass);
976 element_class = (GstElementClass *) klass;
977 gobject_class = (GObjectClass *) klass;
978 video_decoder_class = (GstVideoDecoderClass *) klass;
980 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_dec_debug, "v4l2videodec", 0,
981 "V4L2 Video Decoder");
983 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_dispose);
984 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finalize);
985 gobject_class->set_property =
986 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_property);
987 gobject_class->get_property =
988 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_get_property);
990 video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_open);
991 video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_close);
992 video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_start);
993 video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_stop);
994 video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_finish);
995 video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_flush);
996 video_decoder_class->drain = GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_drain);
997 video_decoder_class->set_format =
998 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_set_format);
999 video_decoder_class->negotiate =
1000 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_negotiate);
1001 video_decoder_class->decide_allocation =
1002 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_decide_allocation);
1003 /* FIXME propose_allocation or not ? */
1004 video_decoder_class->handle_frame =
1005 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_handle_frame);
1006 video_decoder_class->getcaps =
1007 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_getcaps);
1008 video_decoder_class->src_query =
1009 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_src_query);
1010 video_decoder_class->sink_event =
1011 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_sink_event);
1013 element_class->change_state =
1014 GST_DEBUG_FUNCPTR (gst_v4l2_video_dec_change_state);
1016 gst_v4l2_object_install_m2m_properties_helper (gobject_class);
1020 gst_v4l2_video_dec_subclass_init (gpointer g_class, gpointer data)
1022 GstV4l2VideoDecClass *klass = GST_V4L2_VIDEO_DEC_CLASS (g_class);
1023 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
1024 GstV4l2VideoDecCData *cdata = data;
1026 klass->default_device = cdata->device;
1028 /* Note: gst_pad_template_new() take the floating ref from the caps */
1029 gst_element_class_add_pad_template (element_class,
1030 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
1032 gst_element_class_add_pad_template (element_class,
1033 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
1036 gst_element_class_set_static_metadata (element_class, cdata->longname,
1037 "Codec/Decoder/Video/Hardware", cdata->description,
1038 "Nicolas Dufresne <nicolas.dufresne@collabora.com>");
1040 gst_caps_unref (cdata->sink_caps);
1041 gst_caps_unref (cdata->src_caps);
1045 /* Probing functions */
1047 gst_v4l2_is_video_dec (GstCaps * sink_caps, GstCaps * src_caps)
1049 gboolean ret = FALSE;
1051 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_codec_caps ())
1052 && gst_caps_is_subset (src_caps, gst_v4l2_object_get_raw_caps ()))
1059 gst_v4l2_video_dec_set_metadata (GstStructure * s, GstV4l2VideoDecCData * cdata,
1060 const gchar * basename)
1062 gchar *codec_name = NULL;
1063 gchar *type_name = NULL;
1065 #define SET_META(codec) \
1067 cdata->longname = "V4L2 " codec " Decoder"; \
1068 cdata->description = "Decodes " codec " streams via V4L2 API"; \
1069 codec_name = g_ascii_strdown (codec, -1); \
1072 if (gst_structure_has_name (s, "image/jpeg")) {
1074 } else if (gst_structure_has_name (s, "video/mpeg")) {
1075 gint mpegversion = 0;
1076 gst_structure_get_int (s, "mpegversion", &mpegversion);
1078 if (mpegversion == 2) {
1083 } else if (gst_structure_has_name (s, "video/x-h263")) {
1085 } else if (gst_structure_has_name (s, "video/x-fwht")) {
1087 } else if (gst_structure_has_name (s, "video/x-h264")) {
1089 } else if (gst_structure_has_name (s, "video/x-h265")) {
1091 } else if (gst_structure_has_name (s, "video/x-wmv")) {
1093 } else if (gst_structure_has_name (s, "video/x-vp8")) {
1095 } else if (gst_structure_has_name (s, "video/x-vp9")) {
1097 } else if (gst_structure_has_name (s, "video/x-bayer")) {
1099 } else if (gst_structure_has_name (s, "video/x-sonix")) {
1101 } else if (gst_structure_has_name (s, "video/x-pwc1")) {
1103 } else if (gst_structure_has_name (s, "video/x-pwc2")) {
1106 /* This code should be kept on sync with the exposed CODEC type of format
1107 * from gstv4l2object.c. This warning will only occure in case we forget
1108 * to also add a format here. */
1109 gchar *s_str = gst_structure_to_string (s);
1110 g_warning ("Missing fixed name mapping for caps '%s', this is a GStreamer "
1111 "bug, please report at https://bugs.gnome.org", s_str);
1116 type_name = g_strdup_printf ("v4l2%sdec", codec_name);
1117 if (g_type_from_name (type_name) != 0) {
1119 type_name = g_strdup_printf ("v4l2%s%sdec", basename, codec_name);
1122 g_free (codec_name);
1130 gst_v4l2_video_dec_register (GstPlugin * plugin, const gchar * basename,
1131 const gchar * device_path, GstCaps * sink_caps, GstCaps * src_caps)
1135 for (i = 0; i < gst_caps_get_size (sink_caps); i++) {
1136 GstV4l2VideoDecCData *cdata;
1138 GTypeQuery type_query;
1139 GTypeInfo type_info = { 0, };
1140 GType type, subtype;
1143 s = gst_caps_get_structure (sink_caps, i);
1145 cdata = g_new0 (GstV4l2VideoDecCData, 1);
1146 cdata->device = g_strdup (device_path);
1147 cdata->sink_caps = gst_caps_new_empty ();
1148 gst_caps_append_structure (cdata->sink_caps, gst_structure_copy (s));
1149 cdata->src_caps = gst_caps_ref (src_caps);
1150 type_name = gst_v4l2_video_dec_set_metadata (s, cdata, basename);
1152 /* Skip over if we hit an unmapped type */
1158 type = gst_v4l2_video_dec_get_type ();
1159 g_type_query (type, &type_query);
1160 memset (&type_info, 0, sizeof (type_info));
1161 type_info.class_size = type_query.class_size;
1162 type_info.instance_size = type_query.instance_size;
1163 type_info.class_init = gst_v4l2_video_dec_subclass_init;
1164 type_info.class_data = cdata;
1165 type_info.instance_init = gst_v4l2_video_dec_subinstance_init;
1167 subtype = g_type_register_static (type, type_name, &type_info, 0);
1168 if (!gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1,
1170 GST_WARNING ("Failed to register plugin '%s'", type_name);