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 /* activating a capture pool will also call STREAMON. CODA driver will
341 * refuse to configure the output if the capture is stremaing. */
342 if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
344 GST_WARNING_OBJECT (self, "Could not activate capture buffer pool.");
348 self->input_state = gst_video_codec_state_ref (state);
350 GST_DEBUG_OBJECT (self, "output caps: %" GST_PTR_FORMAT, state->caps);
356 gst_v4l2_video_enc_flush (GstVideoEncoder * encoder)
358 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
360 GST_DEBUG_OBJECT (self, "Flushing");
362 /* Ensure the processing thread has stopped for the reverse playback
364 if (g_atomic_int_get (&self->processing)) {
365 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
367 gst_v4l2_object_unlock_stop (self->v4l2output);
368 gst_v4l2_object_unlock_stop (self->v4l2capture);
369 gst_pad_stop_task (encoder->srcpad);
371 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
375 self->output_flow = GST_FLOW_OK;
377 gst_v4l2_object_unlock_stop (self->v4l2output);
378 gst_v4l2_object_unlock_stop (self->v4l2capture);
383 struct ProfileLevelCtx
385 GstV4l2VideoEnc *self;
386 const gchar *profile;
391 get_string_list (GstStructure * s, const gchar * field, GQueue * queue)
395 value = gst_structure_get_value (s, field);
400 if (GST_VALUE_HOLDS_LIST (value)) {
403 if (gst_value_list_get_size (value) == 0)
406 for (i = 0; i < gst_value_list_get_size (value); i++) {
407 const GValue *item = gst_value_list_get_value (value, i);
409 if (G_VALUE_HOLDS_STRING (item))
410 g_queue_push_tail (queue, g_value_dup_string (item));
412 } else if (G_VALUE_HOLDS_STRING (value)) {
413 g_queue_push_tail (queue, g_value_dup_string (value));
420 negotiate_profile_and_level (GstCapsFeatures * features, GstStructure * s,
423 struct ProfileLevelCtx *ctx = user_data;
424 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_GET_CLASS (ctx->self);
425 GstV4l2Object *v4l2object = GST_V4L2_VIDEO_ENC (ctx->self)->v4l2output;
426 GQueue profiles = G_QUEUE_INIT;
427 GQueue levels = G_QUEUE_INIT;
428 gboolean failed = FALSE;
430 if (klass->profile_cid && get_string_list (s, "profile", &profiles)) {
433 for (l = profiles.head; l; l = l->next) {
434 struct v4l2_control control = { 0, };
436 const gchar *profile = l->data;
438 GST_TRACE_OBJECT (ctx->self, "Trying profile %s", profile);
440 control.id = klass->profile_cid;
441 control.value = v4l2_profile = klass->profile_from_string (profile);
443 if (control.value < 0)
446 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
447 GST_WARNING_OBJECT (ctx->self, "Failed to set %s profile: '%s'",
448 klass->codec_name, g_strerror (errno));
452 profile = klass->profile_to_string (control.value);
454 if (control.value == v4l2_profile) {
455 ctx->profile = profile;
459 if (g_list_find_custom (l, profile, g_str_equal)) {
460 ctx->profile = profile;
465 if (profiles.length && !ctx->profile)
468 g_queue_foreach (&profiles, (GFunc) g_free, NULL);
469 g_queue_clear (&profiles);
472 if (!failed && klass->level_cid && get_string_list (s, "level", &levels)) {
475 for (l = levels.head; l; l = l->next) {
476 struct v4l2_control control = { 0, };
478 const gchar *level = l->data;
480 GST_TRACE_OBJECT (ctx->self, "Trying level %s", level);
482 control.id = klass->level_cid;
483 control.value = v4l2_level = klass->level_from_string (level);
485 if (control.value < 0)
488 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
489 GST_WARNING_OBJECT (ctx->self, "Failed to set %s level: '%s'",
490 klass->codec_name, g_strerror (errno));
494 level = klass->level_to_string (control.value);
496 if (control.value == v4l2_level) {
501 if (g_list_find_custom (l, level, g_str_equal)) {
507 if (levels.length && !ctx->level)
510 g_queue_foreach (&levels, (GFunc) g_free, NULL);
511 g_queue_clear (&levels);
514 /* If it failed, we continue */
519 gst_v4l2_video_enc_negotiate (GstVideoEncoder * encoder)
521 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_GET_CLASS (encoder);
522 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
523 GstV4l2Object *v4l2object = self->v4l2output;
524 GstCaps *allowed_caps;
525 struct ProfileLevelCtx ctx = { self, NULL, NULL };
526 GstVideoCodecState *state;
529 GST_DEBUG_OBJECT (self, "Negotiating %s profile and level.",
532 allowed_caps = gst_pad_get_allowed_caps (GST_VIDEO_ENCODER_SRC_PAD (encoder));
536 if (gst_caps_is_empty (allowed_caps))
539 allowed_caps = gst_caps_make_writable (allowed_caps);
541 /* negotiate_profile_and_level() will return TRUE on failure to keep
542 * iterating, if gst_caps_foreach() returns TRUE it means there was no
543 * compatible profile and level in any of the structure */
544 if (gst_caps_foreach (allowed_caps, negotiate_profile_and_level, &ctx)) {
545 goto no_profile_level;
549 if (klass->profile_cid && !ctx.profile) {
550 struct v4l2_control control = { 0, };
552 control.id = klass->profile_cid;
554 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
557 ctx.profile = klass->profile_to_string (control.value);
560 if (klass->level_cid && !ctx.level) {
561 struct v4l2_control control = { 0, };
563 control.id = klass->level_cid;
565 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
568 ctx.level = klass->level_to_string (control.value);
571 GST_DEBUG_OBJECT (self, "Selected %s profile %s at level %s",
572 klass->codec_name, ctx.profile, ctx.level);
574 state = gst_video_encoder_get_output_state (encoder);
575 s = gst_caps_get_structure (state->caps, 0);
577 if (klass->profile_cid)
578 gst_structure_set (s, "profile", G_TYPE_STRING, ctx.profile, NULL);
580 if (klass->level_cid)
581 gst_structure_set (s, "level", G_TYPE_STRING, ctx.level, NULL);
583 if (!GST_VIDEO_ENCODER_CLASS (parent_class)->negotiate (encoder))
589 GST_WARNING_OBJECT (self, "Failed to get %s profile and level: '%s'",
590 klass->codec_name, g_strerror (errno));
594 GST_WARNING_OBJECT (self, "No compatible level and profile in caps: %"
595 GST_PTR_FORMAT, allowed_caps);
600 gst_caps_unref (allowed_caps);
604 static GstVideoCodecFrame *
605 gst_v4l2_video_enc_get_oldest_frame (GstVideoEncoder * encoder)
607 GstVideoCodecFrame *frame = NULL;
611 frames = gst_video_encoder_get_frames (encoder);
613 for (l = frames; l != NULL; l = l->next) {
614 GstVideoCodecFrame *f = l->data;
616 if (!frame || frame->pts > f->pts)
623 GST_LOG_OBJECT (encoder,
624 "Oldest frame is %d %" GST_TIME_FORMAT
625 " and %d frames left",
626 frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
627 gst_video_codec_frame_ref (frame);
630 g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
636 gst_v4l2_video_enc_loop (GstVideoEncoder * encoder)
638 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
639 GstVideoCodecFrame *frame;
640 GstBuffer *buffer = NULL;
643 GST_LOG_OBJECT (encoder, "Allocate output buffer");
645 buffer = gst_video_encoder_allocate_output_buffer (encoder,
646 self->v4l2capture->info.size);
648 if (NULL == buffer) {
649 ret = GST_FLOW_FLUSHING;
654 /* FIXME Check if buffer isn't the last one here */
656 GST_LOG_OBJECT (encoder, "Process output buffer");
658 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL
659 (self->v4l2capture->pool), &buffer);
661 if (ret != GST_FLOW_OK)
664 frame = gst_v4l2_video_enc_get_oldest_frame (encoder);
667 frame->output_buffer = buffer;
669 ret = gst_video_encoder_finish_frame (encoder, frame);
671 if (ret != GST_FLOW_OK)
674 GST_WARNING_OBJECT (encoder, "Encoder is producing too many buffers");
675 gst_buffer_unref (buffer);
681 GST_DEBUG_OBJECT (encoder, "Leaving output thread");
683 gst_buffer_replace (&buffer, NULL);
684 self->output_flow = ret;
685 g_atomic_int_set (&self->processing, FALSE);
686 gst_v4l2_object_unlock (self->v4l2output);
687 gst_pad_pause_task (encoder->srcpad);
691 gst_v4l2_video_enc_loop_stopped (GstV4l2VideoEnc * self)
693 if (g_atomic_int_get (&self->processing)) {
694 GST_DEBUG_OBJECT (self, "Early stop of encoding thread");
695 self->output_flow = GST_FLOW_FLUSHING;
696 g_atomic_int_set (&self->processing, FALSE);
699 GST_DEBUG_OBJECT (self, "Encoding task destroyed: %s",
700 gst_flow_get_name (self->output_flow));
705 gst_v4l2_video_enc_handle_frame (GstVideoEncoder * encoder,
706 GstVideoCodecFrame * frame)
708 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
709 GstFlowReturn ret = GST_FLOW_OK;
710 GstTaskState task_state;
712 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
714 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
717 task_state = gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self));
718 if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED) {
719 GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
721 /* It possible that the processing thread stopped due to an error */
722 if (self->output_flow != GST_FLOW_OK &&
723 self->output_flow != GST_FLOW_FLUSHING) {
724 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
725 ret = self->output_flow;
729 /* Ensure input internal pool is active */
730 if (!gst_buffer_pool_is_active (pool)) {
731 GstStructure *config = gst_buffer_pool_get_config (pool);
732 guint min = MAX (self->v4l2output->min_buffers, GST_V4L2_MIN_BUFFERS);
734 gst_buffer_pool_config_set_params (config, self->input_state->caps,
735 self->v4l2output->info.size, min, min);
737 /* There is no reason to refuse this config */
738 if (!gst_buffer_pool_set_config (pool, config))
739 goto activate_failed;
741 if (!gst_buffer_pool_set_active (pool, TRUE))
742 goto activate_failed;
745 GST_DEBUG_OBJECT (self, "Starting encoding thread");
747 /* Start the processing task, when it quits, the task will disable input
748 * processing to unlock input if draining, or prevent potential block */
749 if (!gst_pad_start_task (encoder->srcpad,
750 (GstTaskFunction) gst_v4l2_video_enc_loop, self,
751 (GDestroyNotify) gst_v4l2_video_enc_loop_stopped))
752 goto start_task_failed;
755 if (frame->input_buffer) {
756 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
758 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL
759 (self->v4l2output->pool), &frame->input_buffer);
760 GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
762 if (ret == GST_FLOW_FLUSHING) {
763 if (gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self)) !=
765 ret = self->output_flow;
767 } else if (ret != GST_FLOW_OK) {
772 gst_video_codec_frame_unref (frame);
778 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
779 (_("Failed to allocate required memory.")),
780 ("Buffer pool activation failed"));
781 return GST_FLOW_ERROR;
786 ret = GST_FLOW_FLUSHING;
791 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
792 (_("Failed to start encoding thread.")), (NULL));
793 g_atomic_int_set (&self->processing, FALSE);
794 ret = GST_FLOW_ERROR;
799 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
800 (_("Failed to process frame.")),
801 ("Maybe be due to not enough memory or failing driver"));
802 ret = GST_FLOW_ERROR;
807 gst_video_encoder_finish_frame (encoder, frame);
813 gst_v4l2_video_enc_decide_allocation (GstVideoEncoder *
814 encoder, GstQuery * query)
816 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
817 GstVideoCodecState *state = gst_video_encoder_get_output_state (encoder);
818 GstV4l2Error error = GST_V4L2_ERROR_INIT;
819 GstClockTime latency;
820 gboolean ret = FALSE;
822 /* We need to set the format here, since this is called right after
823 * GstVideoEncoder have set the width, height and framerate into the state
824 * caps. These are needed by the driver to calculate the buffer size and to
825 * implement bitrate adaptation. */
826 if (!gst_v4l2_object_set_format (self->v4l2capture, state->caps, &error)) {
827 gst_v4l2_error (self, &error);
832 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query)) {
833 GstVideoEncoderClass *enc_class = GST_VIDEO_ENCODER_CLASS (parent_class);
834 ret = enc_class->decide_allocation (encoder, query);
837 /* FIXME This may not be entirely correct, as encoder may keep some
838 * observation withouth delaying the encoding. Linux Media API need some
839 * more work to explicitly expressed the decoder / encoder latency. This
840 * value will then become max latency, and the reported driver latency would
841 * become the min latency. */
842 latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
843 gst_video_encoder_set_latency (encoder, latency, latency);
846 gst_video_codec_state_unref (state);
851 gst_v4l2_video_enc_propose_allocation (GstVideoEncoder *
852 encoder, GstQuery * query)
854 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
855 gboolean ret = FALSE;
857 GST_DEBUG_OBJECT (self, "called");
862 ret = gst_v4l2_object_propose_allocation (self->v4l2output, query);
865 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder,
872 gst_v4l2_video_enc_src_query (GstVideoEncoder * encoder, GstQuery * query)
875 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
876 switch (GST_QUERY_TYPE (query)) {
877 case GST_QUERY_CAPS:{
878 GstCaps *filter, *result = NULL;
879 GstPad *pad = GST_VIDEO_ENCODER_SRC_PAD (encoder);
881 gst_query_parse_caps (query, &filter);
883 /* FIXME Try and not probe the entire encoder, but only the implement
885 if (self->probed_srccaps) {
886 GstCaps *tmpl = gst_pad_get_pad_template_caps (pad);
887 result = gst_caps_intersect (tmpl, self->probed_srccaps);
888 gst_caps_unref (tmpl);
890 result = gst_pad_get_pad_template_caps (pad);
893 GstCaps *tmp = result;
895 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
896 gst_caps_unref (tmp);
899 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
901 gst_query_set_caps_result (query, result);
902 gst_caps_unref (result);
907 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->src_query (encoder, query);
915 gst_v4l2_video_enc_sink_query (GstVideoEncoder * encoder, GstQuery * query)
918 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
920 switch (GST_QUERY_TYPE (query)) {
921 case GST_QUERY_CAPS:{
922 GstCaps *filter, *result = NULL;
923 GstPad *pad = GST_VIDEO_ENCODER_SINK_PAD (encoder);
925 gst_query_parse_caps (query, &filter);
927 if (self->probed_sinkcaps)
928 result = gst_caps_ref (self->probed_sinkcaps);
930 result = gst_pad_get_pad_template_caps (pad);
933 GstCaps *tmp = result;
935 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
936 gst_caps_unref (tmp);
939 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
941 gst_query_set_caps_result (query, result);
942 gst_caps_unref (result);
947 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_query (encoder, query);
955 gst_v4l2_video_enc_sink_event (GstVideoEncoder * encoder, GstEvent * event)
957 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
960 switch (GST_EVENT_TYPE (event)) {
961 case GST_EVENT_FLUSH_START:
962 GST_DEBUG_OBJECT (self, "flush start");
963 gst_v4l2_object_unlock (self->v4l2output);
964 gst_v4l2_object_unlock (self->v4l2capture);
970 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_event (encoder, event);
972 switch (GST_EVENT_TYPE (event)) {
973 case GST_EVENT_FLUSH_START:
974 gst_pad_stop_task (encoder->srcpad);
975 GST_DEBUG_OBJECT (self, "flush start done");
983 static GstStateChangeReturn
984 gst_v4l2_video_enc_change_state (GstElement * element,
985 GstStateChange transition)
987 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (element);
989 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
990 g_atomic_int_set (&self->active, FALSE);
991 gst_v4l2_object_unlock (self->v4l2output);
992 gst_v4l2_object_unlock (self->v4l2capture);
995 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1000 gst_v4l2_video_enc_dispose (GObject * object)
1002 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
1004 gst_caps_replace (&self->probed_sinkcaps, NULL);
1005 gst_caps_replace (&self->probed_srccaps, NULL);
1007 G_OBJECT_CLASS (parent_class)->dispose (object);
1011 gst_v4l2_video_enc_finalize (GObject * object)
1013 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
1015 gst_v4l2_object_destroy (self->v4l2capture);
1016 gst_v4l2_object_destroy (self->v4l2output);
1018 G_OBJECT_CLASS (parent_class)->finalize (object);
1023 gst_v4l2_video_enc_init (GstV4l2VideoEnc * self)
1025 /* V4L2 object are created in subinstance_init */
1029 gst_v4l2_video_enc_subinstance_init (GTypeInstance * instance, gpointer g_class)
1031 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class);
1032 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (instance);
1034 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
1035 GST_OBJECT (GST_VIDEO_ENCODER_SINK_PAD (self)),
1036 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
1037 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
1038 self->v4l2output->no_initial_format = TRUE;
1039 self->v4l2output->keep_aspect = FALSE;
1041 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
1042 GST_OBJECT (GST_VIDEO_ENCODER_SRC_PAD (self)),
1043 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
1044 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
1048 gst_v4l2_video_enc_class_init (GstV4l2VideoEncClass * klass)
1050 GstElementClass *element_class;
1051 GObjectClass *gobject_class;
1052 GstVideoEncoderClass *video_encoder_class;
1054 parent_class = g_type_class_peek_parent (klass);
1056 element_class = (GstElementClass *) klass;
1057 gobject_class = (GObjectClass *) klass;
1058 video_encoder_class = (GstVideoEncoderClass *) klass;
1060 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_enc_debug, "v4l2videoenc", 0,
1061 "V4L2 Video Encoder");
1063 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_dispose);
1064 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finalize);
1065 gobject_class->set_property =
1066 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_property);
1067 gobject_class->get_property =
1068 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_get_property);
1070 video_encoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_open);
1071 video_encoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_close);
1072 video_encoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_start);
1073 video_encoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_stop);
1074 video_encoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finish);
1075 video_encoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_flush);
1076 video_encoder_class->set_format =
1077 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_format);
1078 video_encoder_class->negotiate =
1079 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_negotiate);
1080 video_encoder_class->decide_allocation =
1081 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_decide_allocation);
1082 video_encoder_class->propose_allocation =
1083 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_propose_allocation);
1084 video_encoder_class->sink_query =
1085 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_query);
1086 video_encoder_class->src_query =
1087 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_src_query);
1088 video_encoder_class->sink_event =
1089 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_event);
1090 video_encoder_class->handle_frame =
1091 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_handle_frame);
1093 element_class->change_state =
1094 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_change_state);
1096 gst_v4l2_object_install_m2m_properties_helper (gobject_class);
1100 gst_v4l2_video_enc_subclass_init (gpointer g_class, gpointer data)
1102 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class);
1103 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
1104 GstV4l2VideoEncCData *cdata = data;
1106 klass->default_device = cdata->device;
1108 /* Note: gst_pad_template_new() take the floating ref from the caps */
1109 gst_element_class_add_pad_template (element_class,
1110 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
1112 gst_element_class_add_pad_template (element_class,
1113 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
1116 gst_caps_unref (cdata->sink_caps);
1117 gst_caps_unref (cdata->src_caps);
1121 /* Probing functions */
1123 gst_v4l2_is_video_enc (GstCaps * sink_caps, GstCaps * src_caps,
1124 GstCaps * codec_caps)
1126 gboolean ret = FALSE;
1127 gboolean (*check_caps) (const GstCaps *, const GstCaps *);
1130 check_caps = gst_caps_can_intersect;
1132 codec_caps = gst_v4l2_object_get_codec_caps ();
1133 check_caps = gst_caps_is_subset;
1136 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_raw_caps ())
1137 && check_caps (src_caps, codec_caps))
1144 gst_v4l2_video_enc_register (GstPlugin * plugin, GType type,
1145 const char *codec, const gchar * basename, const gchar * device_path,
1146 GstCaps * sink_caps, GstCaps * codec_caps, GstCaps * src_caps)
1148 GstCaps *filtered_caps;
1149 GTypeQuery type_query;
1150 GTypeInfo type_info = { 0, };
1153 GstV4l2VideoEncCData *cdata;
1155 filtered_caps = gst_caps_intersect (src_caps, codec_caps);
1157 cdata = g_new0 (GstV4l2VideoEncCData, 1);
1158 cdata->device = g_strdup (device_path);
1159 cdata->sink_caps = gst_caps_ref (sink_caps);
1160 cdata->src_caps = gst_caps_ref (filtered_caps);
1162 g_type_query (type, &type_query);
1163 memset (&type_info, 0, sizeof (type_info));
1164 type_info.class_size = type_query.class_size;
1165 type_info.instance_size = type_query.instance_size;
1166 type_info.class_init = gst_v4l2_video_enc_subclass_init;
1167 type_info.class_data = cdata;
1168 type_info.instance_init = gst_v4l2_video_enc_subinstance_init;
1170 /* The first encoder to be registered should use a constant name, like
1171 * v4l2h264enc, for any additional encoders, we create unique names. Encoder
1172 * names may change between boots, so this should help gain stable names for
1173 * the most common use cases. */
1174 type_name = g_strdup_printf ("v4l2%senc", codec);
1176 if (g_type_from_name (type_name) != 0) {
1178 type_name = g_strdup_printf ("v4l2%s%senc", basename, codec);
1181 subtype = g_type_register_static (type, type_name, &type_info, 0);
1183 if (!gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype))
1184 GST_WARNING ("Failed to register plugin '%s'", type_name);