2 * Copyright (C) 2014-2017 SUMOMO Computer Association
3 * Authors Ayaka <ayaka@soulik.info>
4 * Copyright (C) 2017 Collabora Ltd.
5 * Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
34 #include "gstv4l2object.h"
35 #include "gstv4l2videoenc.h"
38 #include <gst/gst-i18n-plugin.h>
40 GST_DEBUG_CATEGORY_STATIC (gst_v4l2_video_enc_debug);
41 #define GST_CAT_DEFAULT gst_v4l2_video_enc_debug
48 } GstV4l2VideoEncCData;
53 V4L2_STD_OBJECT_PROPS,
56 #define gst_v4l2_video_enc_parent_class parent_class
57 G_DEFINE_ABSTRACT_TYPE (GstV4l2VideoEnc, gst_v4l2_video_enc,
58 GST_TYPE_VIDEO_ENCODER);
61 gst_v4l2_video_enc_set_property (GObject * object,
62 guint prop_id, const GValue * value, GParamSpec * pspec)
64 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
67 case PROP_CAPTURE_IO_MODE:
68 if (!gst_v4l2_object_set_property_helper (self->v4l2capture,
69 prop_id, value, pspec)) {
70 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
74 /* By default, only set on output */
76 if (!gst_v4l2_object_set_property_helper (self->v4l2output,
77 prop_id, value, pspec)) {
78 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
85 gst_v4l2_video_enc_get_property (GObject * object,
86 guint prop_id, GValue * value, GParamSpec * pspec)
88 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
91 case PROP_CAPTURE_IO_MODE:
92 if (!gst_v4l2_object_get_property_helper (self->v4l2capture,
93 prop_id, value, pspec)) {
94 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
98 /* By default read from output */
100 if (!gst_v4l2_object_get_property_helper (self->v4l2output,
101 prop_id, value, pspec)) {
102 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
109 gst_v4l2_video_enc_open (GstVideoEncoder * encoder)
111 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
114 GST_DEBUG_OBJECT (self, "Opening");
116 if (!gst_v4l2_object_open (self->v4l2output))
119 if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
122 self->probed_sinkcaps = gst_v4l2_object_probe_caps (self->v4l2output,
123 gst_v4l2_object_get_raw_caps ());
125 if (gst_caps_is_empty (self->probed_sinkcaps))
128 codec_caps = gst_pad_get_pad_template_caps (encoder->srcpad);
129 self->probed_srccaps = gst_v4l2_object_probe_caps (self->v4l2capture,
131 gst_caps_unref (codec_caps);
133 if (gst_caps_is_empty (self->probed_srccaps))
134 goto no_encoded_format;
139 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
140 (_("Encoder on device %s has no supported output format"),
141 self->v4l2output->videodev), (NULL));
146 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
147 (_("Encoder on device %s has no supported input format"),
148 self->v4l2output->videodev), (NULL));
152 if (GST_V4L2_IS_OPEN (self->v4l2output))
153 gst_v4l2_object_close (self->v4l2output);
155 if (GST_V4L2_IS_OPEN (self->v4l2capture))
156 gst_v4l2_object_close (self->v4l2capture);
158 gst_caps_replace (&self->probed_srccaps, NULL);
159 gst_caps_replace (&self->probed_sinkcaps, NULL);
165 gst_v4l2_video_enc_close (GstVideoEncoder * encoder)
167 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
169 GST_DEBUG_OBJECT (self, "Closing");
171 gst_v4l2_object_close (self->v4l2output);
172 gst_v4l2_object_close (self->v4l2capture);
173 gst_caps_replace (&self->probed_srccaps, NULL);
174 gst_caps_replace (&self->probed_sinkcaps, NULL);
180 gst_v4l2_video_enc_start (GstVideoEncoder * encoder)
182 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
184 GST_DEBUG_OBJECT (self, "Starting");
186 gst_v4l2_object_unlock (self->v4l2output);
187 g_atomic_int_set (&self->active, TRUE);
188 self->output_flow = GST_FLOW_OK;
194 gst_v4l2_video_enc_stop (GstVideoEncoder * encoder)
196 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
198 GST_DEBUG_OBJECT (self, "Stopping");
200 gst_v4l2_object_unlock (self->v4l2output);
201 gst_v4l2_object_unlock (self->v4l2capture);
203 /* Wait for capture thread to stop */
204 gst_pad_stop_task (encoder->srcpad);
206 GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
207 self->output_flow = GST_FLOW_OK;
208 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
210 /* Should have been flushed already */
211 g_assert (g_atomic_int_get (&self->active) == FALSE);
212 g_assert (g_atomic_int_get (&self->processing) == FALSE);
214 gst_v4l2_object_stop (self->v4l2output);
215 gst_v4l2_object_stop (self->v4l2capture);
217 if (self->input_state) {
218 gst_video_codec_state_unref (self->input_state);
219 self->input_state = NULL;
222 GST_DEBUG_OBJECT (self, "Stopped");
228 gst_v4l2_encoder_cmd (GstV4l2Object * v4l2object, guint cmd, guint flags)
230 struct v4l2_encoder_cmd ecmd = { 0, };
232 GST_DEBUG_OBJECT (v4l2object->element,
233 "sending v4l2 encoder command %u with flags %u", cmd, flags);
235 if (!GST_V4L2_IS_OPEN (v4l2object))
240 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENCODER_CMD, &ecmd) < 0)
246 if (errno == ENOTTY) {
247 GST_INFO_OBJECT (v4l2object->element,
248 "Failed to send encoder command %u with flags %u for '%s'. (%s)",
249 cmd, flags, v4l2object->videodev, g_strerror (errno));
251 GST_ERROR_OBJECT (v4l2object->element,
252 "Failed to send encoder command %u with flags %u for '%s'. (%s)",
253 cmd, flags, v4l2object->videodev, g_strerror (errno));
259 gst_v4l2_video_enc_finish (GstVideoEncoder * encoder)
261 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
262 GstFlowReturn ret = GST_FLOW_OK;
264 if (gst_pad_get_task_state (encoder->srcpad) != GST_TASK_STARTED)
267 GST_DEBUG_OBJECT (self, "Finishing encoding");
269 /* drop the stream lock while draining, so remaining buffers can be
270 * pushed from the src pad task thread */
271 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
273 if (gst_v4l2_encoder_cmd (self->v4l2capture, V4L2_ENC_CMD_STOP, 0)) {
274 GstTask *task = encoder->srcpad->task;
276 /* Wait for the task to be drained */
277 GST_OBJECT_LOCK (task);
278 while (GST_TASK_STATE (task) == GST_TASK_STARTED)
279 GST_TASK_WAIT (task);
280 GST_OBJECT_UNLOCK (task);
281 ret = GST_FLOW_FLUSHING;
284 /* and ensure the processing thread has stopped in case another error
286 gst_v4l2_object_unlock (self->v4l2capture);
287 gst_pad_stop_task (encoder->srcpad);
288 GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
290 if (ret == GST_FLOW_FLUSHING)
291 ret = self->output_flow;
293 GST_DEBUG_OBJECT (encoder, "Done draining buffers");
300 gst_v4l2_video_enc_set_format (GstVideoEncoder * encoder,
301 GstVideoCodecState * state)
304 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
305 GstV4l2Error error = GST_V4L2_ERROR_INIT;
307 GstVideoCodecState *output;
309 GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
311 if (self->input_state) {
312 if (gst_v4l2_object_caps_equal (self->v4l2output, state->caps)) {
313 GST_DEBUG_OBJECT (self, "Compatible caps");
317 if (gst_v4l2_video_enc_finish (encoder) != GST_FLOW_OK)
320 gst_v4l2_object_stop (self->v4l2output);
321 gst_v4l2_object_stop (self->v4l2capture);
323 gst_video_codec_state_unref (self->input_state);
324 self->input_state = NULL;
327 outcaps = gst_pad_get_pad_template_caps (encoder->srcpad);
328 outcaps = gst_caps_make_writable (outcaps);
329 output = gst_video_encoder_set_output_state (encoder, outcaps, state);
330 gst_video_codec_state_unref (output);
332 if (!gst_video_encoder_negotiate (encoder))
335 if (!gst_v4l2_object_set_format (self->v4l2output, state->caps, &error)) {
336 gst_v4l2_error (self, &error);
340 self->input_state = gst_video_codec_state_ref (state);
342 GST_DEBUG_OBJECT (self, "output caps: %" GST_PTR_FORMAT, state->caps);
348 gst_v4l2_video_enc_flush (GstVideoEncoder * encoder)
350 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
352 GST_DEBUG_OBJECT (self, "Flushing");
354 /* Ensure the processing thread has stopped for the reverse playback
356 if (g_atomic_int_get (&self->processing)) {
357 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
359 gst_v4l2_object_unlock_stop (self->v4l2output);
360 gst_v4l2_object_unlock_stop (self->v4l2capture);
361 gst_pad_stop_task (encoder->srcpad);
363 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
367 self->output_flow = GST_FLOW_OK;
369 gst_v4l2_object_unlock_stop (self->v4l2output);
370 gst_v4l2_object_unlock_stop (self->v4l2capture);
375 struct ProfileLevelCtx
377 GstV4l2VideoEnc *self;
378 const gchar *profile;
383 get_string_list (GstStructure * s, const gchar * field, GQueue * queue)
387 value = gst_structure_get_value (s, field);
392 if (GST_VALUE_HOLDS_LIST (value)) {
395 if (gst_value_list_get_size (value) == 0)
398 for (i = 0; i < gst_value_list_get_size (value); i++) {
399 const GValue *item = gst_value_list_get_value (value, i);
401 if (G_VALUE_HOLDS_STRING (item))
402 g_queue_push_tail (queue, g_value_dup_string (item));
404 } else if (G_VALUE_HOLDS_STRING (value)) {
405 g_queue_push_tail (queue, g_value_dup_string (value));
412 negotiate_profile_and_level (GstCapsFeatures * features, GstStructure * s,
415 struct ProfileLevelCtx *ctx = user_data;
416 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_GET_CLASS (ctx->self);
417 GstV4l2Object *v4l2object = GST_V4L2_VIDEO_ENC (ctx->self)->v4l2output;
418 GQueue profiles = G_QUEUE_INIT;
419 GQueue levels = G_QUEUE_INIT;
420 gboolean failed = FALSE;
422 if (klass->profile_cid && get_string_list (s, "profile", &profiles)) {
425 for (l = profiles.head; l; l = l->next) {
426 struct v4l2_control control = { 0, };
428 const gchar *profile = l->data;
430 GST_TRACE_OBJECT (ctx->self, "Trying profile %s", profile);
432 control.id = klass->profile_cid;
433 control.value = v4l2_profile = klass->profile_from_string (profile);
435 if (control.value < 0)
438 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
439 GST_WARNING_OBJECT (ctx->self, "Failed to set %s profile: '%s'",
440 klass->codec_name, g_strerror (errno));
444 profile = klass->profile_to_string (control.value);
446 if (control.value == v4l2_profile) {
447 ctx->profile = profile;
451 if (g_list_find_custom (l, profile, g_str_equal)) {
452 ctx->profile = profile;
457 if (profiles.length && !ctx->profile)
460 g_queue_foreach (&profiles, (GFunc) g_free, NULL);
461 g_queue_clear (&profiles);
464 if (!failed && klass->level_cid && get_string_list (s, "level", &levels)) {
467 for (l = levels.head; l; l = l->next) {
468 struct v4l2_control control = { 0, };
470 const gchar *level = l->data;
472 GST_TRACE_OBJECT (ctx->self, "Trying level %s", level);
474 control.id = klass->level_cid;
475 control.value = v4l2_level = klass->level_from_string (level);
477 if (control.value < 0)
480 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
481 GST_WARNING_OBJECT (ctx->self, "Failed to set %s level: '%s'",
482 klass->codec_name, g_strerror (errno));
486 level = klass->level_to_string (control.value);
488 if (control.value == v4l2_level) {
493 if (g_list_find_custom (l, level, g_str_equal)) {
499 if (levels.length && !ctx->level)
502 g_queue_foreach (&levels, (GFunc) g_free, NULL);
503 g_queue_clear (&levels);
506 /* If it failed, we continue */
511 gst_v4l2_video_enc_negotiate (GstVideoEncoder * encoder)
513 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_GET_CLASS (encoder);
514 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
515 GstV4l2Object *v4l2object = self->v4l2output;
516 GstCaps *allowed_caps;
517 struct ProfileLevelCtx ctx = { self, NULL, NULL };
518 GstVideoCodecState *state;
521 GST_DEBUG_OBJECT (self, "Negotiating %s profile and level.",
524 allowed_caps = gst_pad_get_allowed_caps (GST_VIDEO_ENCODER_SRC_PAD (encoder));
528 if (gst_caps_is_empty (allowed_caps))
531 allowed_caps = gst_caps_make_writable (allowed_caps);
533 /* negotiate_profile_and_level() will return TRUE on failure to keep
534 * iterating, if gst_caps_foreach() returns TRUE it means there was no
535 * compatible profile and level in any of the structure */
536 if (gst_caps_foreach (allowed_caps, negotiate_profile_and_level, &ctx)) {
537 goto no_profile_level;
541 if (klass->profile_cid && !ctx.profile) {
542 struct v4l2_control control = { 0, };
544 control.id = klass->profile_cid;
546 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
549 ctx.profile = klass->profile_to_string (control.value);
552 if (klass->level_cid && !ctx.level) {
553 struct v4l2_control control = { 0, };
555 control.id = klass->level_cid;
557 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
560 ctx.level = klass->level_to_string (control.value);
563 GST_DEBUG_OBJECT (self, "Selected %s profile %s at level %s",
564 klass->codec_name, ctx.profile, ctx.level);
566 state = gst_video_encoder_get_output_state (encoder);
567 s = gst_caps_get_structure (state->caps, 0);
569 if (klass->profile_cid)
570 gst_structure_set (s, "profile", G_TYPE_STRING, ctx.profile, NULL);
572 if (klass->level_cid)
573 gst_structure_set (s, "level", G_TYPE_STRING, ctx.level, NULL);
575 if (!GST_VIDEO_ENCODER_CLASS (parent_class)->negotiate (encoder))
581 GST_WARNING_OBJECT (self, "Failed to get %s profile and level: '%s'",
582 klass->codec_name, g_strerror (errno));
586 GST_WARNING_OBJECT (self, "No compatible level and profile in caps: %"
587 GST_PTR_FORMAT, allowed_caps);
592 gst_caps_unref (allowed_caps);
596 static GstVideoCodecFrame *
597 gst_v4l2_video_enc_get_oldest_frame (GstVideoEncoder * encoder)
599 GstVideoCodecFrame *frame = NULL;
603 frames = gst_video_encoder_get_frames (encoder);
605 for (l = frames; l != NULL; l = l->next) {
606 GstVideoCodecFrame *f = l->data;
608 if (!frame || frame->pts > f->pts)
615 GST_LOG_OBJECT (encoder,
616 "Oldest frame is %d %" GST_TIME_FORMAT
617 " and %d frames left",
618 frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
619 gst_video_codec_frame_ref (frame);
622 g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
628 gst_v4l2_video_enc_loop (GstVideoEncoder * encoder)
630 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
631 GstVideoCodecFrame *frame;
632 GstBuffer *buffer = NULL;
635 GST_LOG_OBJECT (encoder, "Allocate output buffer");
637 buffer = gst_video_encoder_allocate_output_buffer (encoder,
638 self->v4l2capture->info.size);
640 if (NULL == buffer) {
641 ret = GST_FLOW_FLUSHING;
646 /* FIXME Check if buffer isn't the last one here */
648 GST_LOG_OBJECT (encoder, "Process output buffer");
650 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL
651 (self->v4l2capture->pool), &buffer);
653 if (ret != GST_FLOW_OK)
656 frame = gst_v4l2_video_enc_get_oldest_frame (encoder);
659 frame->output_buffer = buffer;
661 ret = gst_video_encoder_finish_frame (encoder, frame);
663 if (ret != GST_FLOW_OK)
666 GST_WARNING_OBJECT (encoder, "Encoder is producing too many buffers");
667 gst_buffer_unref (buffer);
673 GST_DEBUG_OBJECT (encoder, "Leaving output thread");
675 gst_buffer_replace (&buffer, NULL);
676 self->output_flow = ret;
677 g_atomic_int_set (&self->processing, FALSE);
678 gst_v4l2_object_unlock (self->v4l2output);
679 gst_pad_pause_task (encoder->srcpad);
683 gst_v4l2_video_enc_loop_stopped (GstV4l2VideoEnc * self)
685 if (g_atomic_int_get (&self->processing)) {
686 GST_DEBUG_OBJECT (self, "Early stop of encoding thread");
687 self->output_flow = GST_FLOW_FLUSHING;
688 g_atomic_int_set (&self->processing, FALSE);
691 GST_DEBUG_OBJECT (self, "Encoding task destroyed: %s",
692 gst_flow_get_name (self->output_flow));
697 gst_v4l2_video_enc_handle_frame (GstVideoEncoder * encoder,
698 GstVideoCodecFrame * frame)
700 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
701 GstFlowReturn ret = GST_FLOW_OK;
702 GstTaskState task_state;
704 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
706 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
709 task_state = gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self));
710 if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED) {
711 GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
713 /* It possible that the processing thread stopped due to an error */
714 if (self->output_flow != GST_FLOW_OK &&
715 self->output_flow != GST_FLOW_FLUSHING) {
716 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
717 ret = self->output_flow;
721 /* Ensure input internal pool is active */
722 if (!gst_buffer_pool_is_active (pool)) {
723 GstStructure *config = gst_buffer_pool_get_config (pool);
724 guint min = MAX (self->v4l2output->min_buffers, GST_V4L2_MIN_BUFFERS);
726 gst_buffer_pool_config_set_params (config, self->input_state->caps,
727 self->v4l2output->info.size, min, min);
729 /* There is no reason to refuse this config */
730 if (!gst_buffer_pool_set_config (pool, config))
731 goto activate_failed;
733 if (!gst_buffer_pool_set_active (pool, TRUE))
734 goto activate_failed;
737 if (!gst_buffer_pool_set_active
738 (GST_BUFFER_POOL (self->v4l2capture->pool), TRUE)) {
739 GST_WARNING_OBJECT (self, "Could not activate capture buffer pool.");
740 goto activate_failed;
743 GST_DEBUG_OBJECT (self, "Starting encoding thread");
745 /* Start the processing task, when it quits, the task will disable input
746 * processing to unlock input if draining, or prevent potential block */
747 if (!gst_pad_start_task (encoder->srcpad,
748 (GstTaskFunction) gst_v4l2_video_enc_loop, self,
749 (GDestroyNotify) gst_v4l2_video_enc_loop_stopped))
750 goto start_task_failed;
753 if (frame->input_buffer) {
754 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
756 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL
757 (self->v4l2output->pool), &frame->input_buffer);
758 GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
760 if (ret == GST_FLOW_FLUSHING) {
761 if (gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self)) !=
763 ret = self->output_flow;
765 } else if (ret != GST_FLOW_OK) {
770 gst_video_codec_frame_unref (frame);
776 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
777 (_("Failed to allocate required memory.")),
778 ("Buffer pool activation failed"));
779 return GST_FLOW_ERROR;
784 ret = GST_FLOW_FLUSHING;
789 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
790 (_("Failed to start encoding thread.")), (NULL));
791 g_atomic_int_set (&self->processing, FALSE);
792 ret = GST_FLOW_ERROR;
797 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
798 (_("Failed to process frame.")),
799 ("Maybe be due to not enough memory or failing driver"));
800 ret = GST_FLOW_ERROR;
805 gst_video_encoder_finish_frame (encoder, frame);
811 gst_v4l2_video_enc_decide_allocation (GstVideoEncoder *
812 encoder, GstQuery * query)
814 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
815 GstVideoCodecState *state = gst_video_encoder_get_output_state (encoder);
816 GstV4l2Error error = GST_V4L2_ERROR_INIT;
817 GstClockTime latency;
818 gboolean ret = FALSE;
820 /* We need to set the format here, since this is called right after
821 * GstVideoEncoder have set the width, height and framerate into the state
822 * caps. These are needed by the driver to calculate the buffer size and to
823 * implement bitrate adaptation. */
824 if (!gst_v4l2_object_set_format (self->v4l2capture, state->caps, &error)) {
825 gst_v4l2_error (self, &error);
830 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query)) {
831 GstVideoEncoderClass *enc_class = GST_VIDEO_ENCODER_CLASS (parent_class);
832 ret = enc_class->decide_allocation (encoder, query);
835 /* FIXME This may not be entirely correct, as encoder may keep some
836 * observation withouth delaying the encoding. Linux Media API need some
837 * more work to explicitly expressed the decoder / encoder latency. This
838 * value will then become max latency, and the reported driver latency would
839 * become the min latency. */
840 latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
841 gst_video_encoder_set_latency (encoder, latency, latency);
844 gst_video_codec_state_unref (state);
849 gst_v4l2_video_enc_propose_allocation (GstVideoEncoder *
850 encoder, GstQuery * query)
852 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
853 gboolean ret = FALSE;
855 GST_DEBUG_OBJECT (self, "called");
860 ret = gst_v4l2_object_propose_allocation (self->v4l2output, query);
863 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder,
870 gst_v4l2_video_enc_src_query (GstVideoEncoder * encoder, GstQuery * query)
873 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
874 switch (GST_QUERY_TYPE (query)) {
875 case GST_QUERY_CAPS:{
876 GstCaps *filter, *result = NULL;
877 GstPad *pad = GST_VIDEO_ENCODER_SRC_PAD (encoder);
879 gst_query_parse_caps (query, &filter);
881 /* FIXME Try and not probe the entire encoder, but only the implement
883 if (self->probed_srccaps) {
884 GstCaps *tmpl = gst_pad_get_pad_template_caps (pad);
885 result = gst_caps_intersect (tmpl, self->probed_srccaps);
886 gst_caps_unref (tmpl);
888 result = gst_pad_get_pad_template_caps (pad);
891 GstCaps *tmp = result;
893 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
894 gst_caps_unref (tmp);
897 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
899 gst_query_set_caps_result (query, result);
900 gst_caps_unref (result);
905 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->src_query (encoder, query);
913 gst_v4l2_video_enc_sink_query (GstVideoEncoder * encoder, GstQuery * query)
916 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
918 switch (GST_QUERY_TYPE (query)) {
919 case GST_QUERY_CAPS:{
920 GstCaps *filter, *result = NULL;
921 GstPad *pad = GST_VIDEO_ENCODER_SINK_PAD (encoder);
923 gst_query_parse_caps (query, &filter);
925 if (self->probed_sinkcaps)
926 result = gst_caps_ref (self->probed_sinkcaps);
928 result = gst_pad_get_pad_template_caps (pad);
931 GstCaps *tmp = result;
933 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
934 gst_caps_unref (tmp);
937 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
939 gst_query_set_caps_result (query, result);
940 gst_caps_unref (result);
945 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_query (encoder, query);
953 gst_v4l2_video_enc_sink_event (GstVideoEncoder * encoder, GstEvent * event)
955 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
958 switch (GST_EVENT_TYPE (event)) {
959 case GST_EVENT_FLUSH_START:
960 GST_DEBUG_OBJECT (self, "flush start");
961 gst_v4l2_object_unlock (self->v4l2output);
962 gst_v4l2_object_unlock (self->v4l2capture);
968 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_event (encoder, event);
970 switch (GST_EVENT_TYPE (event)) {
971 case GST_EVENT_FLUSH_START:
972 gst_pad_stop_task (encoder->srcpad);
973 GST_DEBUG_OBJECT (self, "flush start done");
981 static GstStateChangeReturn
982 gst_v4l2_video_enc_change_state (GstElement * element,
983 GstStateChange transition)
985 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (element);
987 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
988 g_atomic_int_set (&self->active, FALSE);
989 gst_v4l2_object_unlock (self->v4l2output);
990 gst_v4l2_object_unlock (self->v4l2capture);
993 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
998 gst_v4l2_video_enc_dispose (GObject * object)
1000 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
1002 gst_caps_replace (&self->probed_sinkcaps, NULL);
1003 gst_caps_replace (&self->probed_srccaps, NULL);
1005 G_OBJECT_CLASS (parent_class)->dispose (object);
1009 gst_v4l2_video_enc_finalize (GObject * object)
1011 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
1013 gst_v4l2_object_destroy (self->v4l2capture);
1014 gst_v4l2_object_destroy (self->v4l2output);
1016 G_OBJECT_CLASS (parent_class)->finalize (object);
1021 gst_v4l2_video_enc_init (GstV4l2VideoEnc * self)
1023 /* V4L2 object are created in subinstance_init */
1027 gst_v4l2_video_enc_subinstance_init (GTypeInstance * instance, gpointer g_class)
1029 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class);
1030 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (instance);
1032 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
1033 GST_OBJECT (GST_VIDEO_ENCODER_SINK_PAD (self)),
1034 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
1035 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
1036 self->v4l2output->no_initial_format = TRUE;
1037 self->v4l2output->keep_aspect = FALSE;
1039 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
1040 GST_OBJECT (GST_VIDEO_ENCODER_SRC_PAD (self)),
1041 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
1042 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
1046 gst_v4l2_video_enc_class_init (GstV4l2VideoEncClass * klass)
1048 GstElementClass *element_class;
1049 GObjectClass *gobject_class;
1050 GstVideoEncoderClass *video_encoder_class;
1052 parent_class = g_type_class_peek_parent (klass);
1054 element_class = (GstElementClass *) klass;
1055 gobject_class = (GObjectClass *) klass;
1056 video_encoder_class = (GstVideoEncoderClass *) klass;
1058 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_enc_debug, "v4l2videoenc", 0,
1059 "V4L2 Video Encoder");
1061 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_dispose);
1062 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finalize);
1063 gobject_class->set_property =
1064 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_property);
1065 gobject_class->get_property =
1066 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_get_property);
1068 video_encoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_open);
1069 video_encoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_close);
1070 video_encoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_start);
1071 video_encoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_stop);
1072 video_encoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finish);
1073 video_encoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_flush);
1074 video_encoder_class->set_format =
1075 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_format);
1076 video_encoder_class->negotiate =
1077 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_negotiate);
1078 video_encoder_class->decide_allocation =
1079 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_decide_allocation);
1080 video_encoder_class->propose_allocation =
1081 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_propose_allocation);
1082 video_encoder_class->sink_query =
1083 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_query);
1084 video_encoder_class->src_query =
1085 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_src_query);
1086 video_encoder_class->sink_event =
1087 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_event);
1088 video_encoder_class->handle_frame =
1089 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_handle_frame);
1091 element_class->change_state =
1092 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_change_state);
1094 gst_v4l2_object_install_m2m_properties_helper (gobject_class);
1098 gst_v4l2_video_enc_subclass_init (gpointer g_class, gpointer data)
1100 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class);
1101 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
1102 GstV4l2VideoEncCData *cdata = data;
1104 klass->default_device = cdata->device;
1106 /* Note: gst_pad_template_new() take the floating ref from the caps */
1107 gst_element_class_add_pad_template (element_class,
1108 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
1110 gst_element_class_add_pad_template (element_class,
1111 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
1114 gst_caps_unref (cdata->sink_caps);
1115 gst_caps_unref (cdata->src_caps);
1119 /* Probing functions */
1121 gst_v4l2_is_video_enc (GstCaps * sink_caps, GstCaps * src_caps,
1122 GstCaps * codec_caps)
1124 gboolean ret = FALSE;
1125 gboolean (*check_caps) (const GstCaps *, const GstCaps *);
1128 check_caps = gst_caps_can_intersect;
1130 codec_caps = gst_v4l2_object_get_codec_caps ();
1131 check_caps = gst_caps_is_subset;
1134 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_raw_caps ())
1135 && check_caps (src_caps, codec_caps))
1142 gst_v4l2_video_enc_register (GstPlugin * plugin, GType type,
1143 const char *codec, const gchar * basename, const gchar * device_path,
1144 GstCaps * sink_caps, GstCaps * codec_caps, GstCaps * src_caps)
1146 GstCaps *filtered_caps;
1147 GTypeQuery type_query;
1148 GTypeInfo type_info = { 0, };
1151 GstV4l2VideoEncCData *cdata;
1153 filtered_caps = gst_caps_intersect (src_caps, codec_caps);
1155 cdata = g_new0 (GstV4l2VideoEncCData, 1);
1156 cdata->device = g_strdup (device_path);
1157 cdata->sink_caps = gst_caps_ref (sink_caps);
1158 cdata->src_caps = gst_caps_ref (filtered_caps);
1160 g_type_query (type, &type_query);
1161 memset (&type_info, 0, sizeof (type_info));
1162 type_info.class_size = type_query.class_size;
1163 type_info.instance_size = type_query.instance_size;
1164 type_info.class_init = gst_v4l2_video_enc_subclass_init;
1165 type_info.class_data = cdata;
1166 type_info.instance_init = gst_v4l2_video_enc_subinstance_init;
1168 /* The first encoder to be registered should use a constant name, like
1169 * v4l2h264enc, for any additional encoders, we create unique names. Encoder
1170 * names may change between boots, so this should help gain stable names for
1171 * the most common use cases. */
1172 type_name = g_strdup_printf ("v4l2%senc", codec);
1174 if (g_type_from_name (type_name) != 0) {
1176 type_name = g_strdup_printf ("v4l2%s%senc", basename, codec);
1179 subtype = g_type_register_static (type, type_name, &type_info, 0);
1181 if (!gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype))
1182 GST_WARNING ("Failed to register plugin '%s'", type_name);