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 <glib/gi18n-lib.h>
40 GST_DEBUG_CATEGORY_STATIC (gst_v4l2_video_enc_debug);
41 #define GST_CAT_DEFAULT gst_v4l2_video_enc_debug
48 const GstV4l2Codec *codec;
49 } GstV4l2VideoEncCData;
54 V4L2_STD_OBJECT_PROPS,
57 #define gst_v4l2_video_enc_parent_class parent_class
58 G_DEFINE_ABSTRACT_TYPE (GstV4l2VideoEnc, gst_v4l2_video_enc,
59 GST_TYPE_VIDEO_ENCODER);
62 gst_v4l2_video_enc_set_property (GObject * object,
63 guint prop_id, const GValue * value, GParamSpec * pspec)
65 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
68 case PROP_CAPTURE_IO_MODE:
69 if (!gst_v4l2_object_set_property_helper (self->v4l2capture,
70 prop_id, value, pspec)) {
71 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
75 /* By default, only set on output */
77 if (!gst_v4l2_object_set_property_helper (self->v4l2output,
78 prop_id, value, pspec)) {
79 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
86 gst_v4l2_video_enc_get_property (GObject * object,
87 guint prop_id, GValue * value, GParamSpec * pspec)
89 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
92 case PROP_CAPTURE_IO_MODE:
93 if (!gst_v4l2_object_get_property_helper (self->v4l2capture,
94 prop_id, value, pspec)) {
95 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
99 /* By default read from output */
101 if (!gst_v4l2_object_get_property_helper (self->v4l2output,
102 prop_id, value, pspec)) {
103 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
110 gst_v4l2_video_enc_open (GstVideoEncoder * encoder)
112 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
113 GstV4l2Error error = GST_V4L2_ERROR_INIT;
116 GST_DEBUG_OBJECT (self, "Opening");
118 if (!gst_v4l2_object_open (self->v4l2output, &error))
121 if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
124 self->probed_sinkcaps = gst_v4l2_object_probe_caps (self->v4l2output,
125 gst_v4l2_object_get_raw_caps ());
127 if (gst_caps_is_empty (self->probed_sinkcaps))
130 codec_caps = gst_pad_get_pad_template_caps (encoder->srcpad);
131 self->probed_srccaps = gst_v4l2_object_probe_caps (self->v4l2capture,
133 gst_caps_unref (codec_caps);
135 if (gst_caps_is_empty (self->probed_srccaps))
136 goto no_encoded_format;
141 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
142 (_("Encoder on device %s has no supported output format"),
143 self->v4l2output->videodev), (NULL));
148 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
149 (_("Encoder on device %s has no supported input format"),
150 self->v4l2output->videodev), (NULL));
154 if (GST_V4L2_IS_OPEN (self->v4l2output))
155 gst_v4l2_object_close (self->v4l2output);
157 if (GST_V4L2_IS_OPEN (self->v4l2capture))
158 gst_v4l2_object_close (self->v4l2capture);
160 gst_caps_replace (&self->probed_srccaps, NULL);
161 gst_caps_replace (&self->probed_sinkcaps, NULL);
163 gst_v4l2_error (self, &error);
169 gst_v4l2_video_enc_close (GstVideoEncoder * encoder)
171 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
173 GST_DEBUG_OBJECT (self, "Closing");
175 gst_v4l2_object_close (self->v4l2output);
176 gst_v4l2_object_close (self->v4l2capture);
177 gst_caps_replace (&self->probed_srccaps, NULL);
178 gst_caps_replace (&self->probed_sinkcaps, NULL);
184 gst_v4l2_video_enc_start (GstVideoEncoder * encoder)
186 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
188 GST_DEBUG_OBJECT (self, "Starting");
190 gst_v4l2_object_unlock (self->v4l2output);
191 g_atomic_int_set (&self->active, TRUE);
192 self->output_flow = GST_FLOW_OK;
198 gst_v4l2_video_enc_stop (GstVideoEncoder * encoder)
200 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
202 GST_DEBUG_OBJECT (self, "Stopping");
204 gst_v4l2_object_unlock (self->v4l2output);
205 gst_v4l2_object_unlock (self->v4l2capture);
207 /* Wait for capture thread to stop */
208 gst_pad_stop_task (encoder->srcpad);
210 GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
211 self->output_flow = GST_FLOW_OK;
212 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
214 /* Should have been flushed already */
215 g_assert (g_atomic_int_get (&self->active) == FALSE);
216 g_assert (g_atomic_int_get (&self->processing) == FALSE);
218 gst_v4l2_object_stop (self->v4l2output);
219 gst_v4l2_object_stop (self->v4l2capture);
221 if (self->input_state) {
222 gst_video_codec_state_unref (self->input_state);
223 self->input_state = NULL;
226 GST_DEBUG_OBJECT (self, "Stopped");
232 gst_v4l2_encoder_cmd (GstV4l2Object * v4l2object, guint cmd, guint flags)
234 struct v4l2_encoder_cmd ecmd = { 0, };
236 GST_DEBUG_OBJECT (v4l2object->element,
237 "sending v4l2 encoder command %u with flags %u", cmd, flags);
239 if (!GST_V4L2_IS_OPEN (v4l2object))
244 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_ENCODER_CMD, &ecmd) < 0)
250 if (errno == ENOTTY) {
251 GST_INFO_OBJECT (v4l2object->element,
252 "Failed to send encoder command %u with flags %u for '%s'. (%s)",
253 cmd, flags, v4l2object->videodev, g_strerror (errno));
255 GST_ERROR_OBJECT (v4l2object->element,
256 "Failed to send encoder command %u with flags %u for '%s'. (%s)",
257 cmd, flags, v4l2object->videodev, g_strerror (errno));
263 gst_v4l2_video_enc_finish (GstVideoEncoder * encoder)
265 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
266 GstFlowReturn ret = GST_FLOW_OK;
268 if (gst_pad_get_task_state (encoder->srcpad) != GST_TASK_STARTED)
271 GST_DEBUG_OBJECT (self, "Finishing encoding");
273 /* drop the stream lock while draining, so remaining buffers can be
274 * pushed from the src pad task thread */
275 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
277 if (gst_v4l2_encoder_cmd (self->v4l2capture, V4L2_ENC_CMD_STOP, 0)) {
278 GstTask *task = encoder->srcpad->task;
280 /* Wait for the task to be drained */
281 GST_DEBUG_OBJECT (self, "Waiting for encoder stop");
282 GST_OBJECT_LOCK (task);
283 while (GST_TASK_STATE (task) == GST_TASK_STARTED)
284 GST_TASK_WAIT (task);
285 GST_OBJECT_UNLOCK (task);
286 ret = GST_FLOW_FLUSHING;
289 /* and ensure the processing thread has stopped in case another error
291 gst_v4l2_object_unlock (self->v4l2capture);
292 gst_pad_stop_task (encoder->srcpad);
293 GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
295 if (ret == GST_FLOW_FLUSHING)
296 ret = self->output_flow;
298 GST_DEBUG_OBJECT (encoder, "Done draining buffers");
305 gst_v4l2_video_enc_set_format (GstVideoEncoder * encoder,
306 GstVideoCodecState * state)
309 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
310 GstV4l2Error error = GST_V4L2_ERROR_INIT;
312 GstVideoCodecState *output;
314 GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
316 if (self->input_state) {
317 if (gst_v4l2_object_caps_equal (self->v4l2output, state->caps)) {
318 GST_DEBUG_OBJECT (self, "Compatible caps");
322 if (gst_v4l2_video_enc_finish (encoder) != GST_FLOW_OK)
325 gst_v4l2_object_stop (self->v4l2output);
326 gst_v4l2_object_stop (self->v4l2capture);
328 gst_video_codec_state_unref (self->input_state);
329 self->input_state = NULL;
332 outcaps = gst_pad_get_pad_template_caps (encoder->srcpad);
333 outcaps = gst_caps_make_writable (outcaps);
334 output = gst_video_encoder_set_output_state (encoder, outcaps, state);
335 gst_video_codec_state_unref (output);
337 if (!gst_video_encoder_negotiate (encoder))
340 if (!gst_v4l2_object_set_format (self->v4l2output, state->caps, &error)) {
341 gst_v4l2_error (self, &error);
346 gst_v4l2_object_setup_padding (self->v4l2output);
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;
429 const GstV4l2Codec *codec = klass->codec;
431 if (codec->profile_cid && get_string_list (s, "profile", &profiles)) {
434 for (l = profiles.head; l; l = l->next) {
435 struct v4l2_control control = { 0, };
437 const gchar *profile = l->data;
439 GST_TRACE_OBJECT (ctx->self, "Trying profile %s", profile);
441 control.id = codec->profile_cid;
443 control.value = v4l2_profile = codec->profile_from_string (profile);
445 if (control.value < 0)
448 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
449 GST_WARNING_OBJECT (ctx->self, "Failed to set %s profile: '%s'",
450 klass->codec_name, g_strerror (errno));
454 profile = codec->profile_to_string (control.value);
456 if (control.value == v4l2_profile) {
457 ctx->profile = profile;
461 if (g_list_find_custom (l, profile, g_str_equal)) {
462 ctx->profile = profile;
467 if (profiles.length && !ctx->profile)
470 g_queue_foreach (&profiles, (GFunc) g_free, NULL);
471 g_queue_clear (&profiles);
474 if (!failed && codec->level_cid && get_string_list (s, "level", &levels)) {
477 for (l = levels.head; l; l = l->next) {
478 struct v4l2_control control = { 0, };
480 const gchar *level = l->data;
482 GST_TRACE_OBJECT (ctx->self, "Trying level %s", level);
484 control.id = codec->level_cid;
485 control.value = v4l2_level = codec->level_from_string (level);
487 if (control.value < 0)
490 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
491 GST_WARNING_OBJECT (ctx->self, "Failed to set %s level: '%s'",
492 klass->codec_name, g_strerror (errno));
496 level = codec->level_to_string (control.value);
498 if (control.value == v4l2_level) {
503 if (g_list_find_custom (l, level, g_str_equal)) {
509 if (levels.length && !ctx->level)
512 g_queue_foreach (&levels, (GFunc) g_free, NULL);
513 g_queue_clear (&levels);
516 /* If it failed, we continue */
521 gst_v4l2_video_enc_negotiate (GstVideoEncoder * encoder)
523 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_GET_CLASS (encoder);
524 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
525 GstV4l2Object *v4l2object = self->v4l2output;
526 GstCaps *allowed_caps;
527 struct ProfileLevelCtx ctx = { self, NULL, NULL };
528 GstVideoCodecState *state;
530 const GstV4l2Codec *codec = klass->codec;
532 GST_DEBUG_OBJECT (self, "Negotiating %s profile and level.",
535 /* Only renegotiate on upstream changes */
536 if (self->input_state)
542 allowed_caps = gst_pad_get_allowed_caps (GST_VIDEO_ENCODER_SRC_PAD (encoder));
546 if (gst_caps_is_empty (allowed_caps))
549 allowed_caps = gst_caps_make_writable (allowed_caps);
551 /* negotiate_profile_and_level() will return TRUE on failure to keep
552 * iterating, if gst_caps_foreach() returns TRUE it means there was no
553 * compatible profile and level in any of the structure */
554 if (gst_caps_foreach (allowed_caps, negotiate_profile_and_level, &ctx)) {
555 goto no_profile_level;
558 gst_caps_unref (allowed_caps);
562 if (codec->profile_cid && !ctx.profile) {
563 struct v4l2_control control = { 0, };
565 control.id = codec->profile_cid;
567 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
570 ctx.profile = codec->profile_to_string (control.value);
573 if (codec->level_cid && !ctx.level) {
574 struct v4l2_control control = { 0, };
576 control.id = codec->level_cid;
578 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
581 ctx.level = codec->level_to_string (control.value);
584 GST_DEBUG_OBJECT (self, "Selected %s profile %s at level %s",
585 klass->codec_name, ctx.profile, ctx.level);
587 state = gst_video_encoder_get_output_state (encoder);
588 s = gst_caps_get_structure (state->caps, 0);
590 if (codec->profile_cid)
591 gst_structure_set (s, "profile", G_TYPE_STRING, ctx.profile, NULL);
593 if (codec->level_cid)
594 gst_structure_set (s, "level", G_TYPE_STRING, ctx.level, NULL);
597 if (!GST_VIDEO_ENCODER_CLASS (parent_class)->negotiate (encoder))
603 GST_WARNING_OBJECT (self, "Failed to get %s profile and level: '%s'",
604 klass->codec_name, g_strerror (errno));
608 GST_WARNING_OBJECT (self, "No compatible level and profile in caps: %"
609 GST_PTR_FORMAT, allowed_caps);
614 gst_caps_unref (allowed_caps);
619 check_system_frame_number_too_old (guint32 current, guint32 old)
621 guint32 absdiff = current > old ? current - old : old - current;
623 /* More than 100 frames in the past, or current wrapped around */
625 /* Wraparound and difference is actually smaller than 100 */
626 if (absdiff > G_MAXUINT32 - 100)
635 gst_v4l2_video_enc_loop (GstVideoEncoder * encoder)
637 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
638 GstVideoCodecFrame *frame;
639 GstBuffer *buffer = NULL;
642 GST_LOG_OBJECT (encoder, "Allocate output buffer");
644 buffer = gst_video_encoder_allocate_output_buffer (encoder,
645 self->v4l2capture->info.size);
647 if (NULL == buffer) {
648 ret = GST_FLOW_FLUSHING;
652 /* FIXME Check if buffer isn't the last one here */
654 GST_LOG_OBJECT (encoder, "Process output buffer");
656 GstV4l2BufferPool *cpool =
657 GST_V4L2_BUFFER_POOL (gst_v4l2_object_get_buffer_pool
658 (self->v4l2capture));
659 ret = gst_v4l2_buffer_pool_process (cpool, &buffer, NULL);
661 gst_object_unref (cpool);
663 if (ret != GST_FLOW_OK)
666 if (GST_BUFFER_TIMESTAMP (buffer) % GST_SECOND != 0)
667 GST_ERROR_OBJECT (encoder,
668 "Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git");
669 GST_LOG_OBJECT (encoder, "Got buffer for frame number %u",
670 (guint32) (GST_BUFFER_PTS (buffer) / GST_SECOND));
672 gst_video_encoder_get_frame (encoder,
673 GST_BUFFER_TIMESTAMP (buffer) / GST_SECOND);
676 GstVideoCodecFrame *oldest_frame;
677 gboolean warned = FALSE;
679 /* Garbage collect old frames in case of codec bugs */
680 while ((oldest_frame = gst_video_encoder_get_oldest_frame (encoder)) &&
681 check_system_frame_number_too_old (frame->system_frame_number,
682 oldest_frame->system_frame_number)) {
683 gst_video_encoder_finish_frame (encoder, oldest_frame);
687 g_warning ("%s: Too old frames, bug in encoder -- please file a bug",
688 GST_ELEMENT_NAME (encoder));
693 gst_video_codec_frame_unref (oldest_frame);
695 /* At this point, the delta unit buffer flag is already correctly set by
696 * gst_v4l2_buffer_pool_process. Since gst_video_encoder_finish_frame
697 * will overwrite it from GST_VIDEO_CODEC_FRAME_IS_SYNC_POINT (frame),
700 if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT))
701 GST_VIDEO_CODEC_FRAME_UNSET_SYNC_POINT (frame);
703 GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT (frame);
704 frame->output_buffer = buffer;
706 ret = gst_video_encoder_finish_frame (encoder, frame);
708 if (ret != GST_FLOW_OK)
711 GST_WARNING_OBJECT (encoder, "Encoder is producing too many buffers");
712 gst_buffer_unref (buffer);
718 GST_DEBUG_OBJECT (encoder, "Leaving output thread");
720 gst_buffer_replace (&buffer, NULL);
721 self->output_flow = ret;
722 g_atomic_int_set (&self->processing, FALSE);
723 gst_v4l2_object_unlock (self->v4l2output);
724 gst_pad_pause_task (encoder->srcpad);
728 gst_v4l2_video_enc_loop_stopped (GstV4l2VideoEnc * self)
730 if (g_atomic_int_get (&self->processing)) {
731 GST_DEBUG_OBJECT (self, "Early stop of encoding thread");
732 self->output_flow = GST_FLOW_FLUSHING;
733 g_atomic_int_set (&self->processing, FALSE);
736 GST_DEBUG_OBJECT (self, "Encoding task destroyed: %s",
737 gst_flow_get_name (self->output_flow));
742 gst_v4l2_video_enc_handle_frame (GstVideoEncoder * encoder,
743 GstVideoCodecFrame * frame)
745 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
746 GstFlowReturn ret = GST_FLOW_OK;
747 GstTaskState task_state;
750 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
752 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
755 task_state = gst_pad_get_task_state (GST_VIDEO_ENCODER_SRC_PAD (self));
756 if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED) {
757 GstBufferPool *pool = gst_v4l2_object_get_buffer_pool (self->v4l2output);
759 /* It is possible that the processing thread stopped due to an error or
760 * when the last buffer has been met during the draining process. */
761 if (self->output_flow != GST_FLOW_OK &&
762 self->output_flow != GST_FLOW_FLUSHING &&
763 self->output_flow != GST_V4L2_FLOW_LAST_BUFFER) {
764 GST_DEBUG_OBJECT (self, "Processing loop stopped with error: %s, leaving",
765 gst_flow_get_name (self->output_flow));
766 ret = self->output_flow;
768 gst_object_unref (pool);
772 /* Ensure input internal pool is active */
773 if (!gst_buffer_pool_is_active (pool)) {
774 GstStructure *config = gst_buffer_pool_get_config (pool);
775 guint min = MAX (self->v4l2output->min_buffers,
776 GST_V4L2_MIN_BUFFERS (self->v4l2output));
778 gst_buffer_pool_config_set_params (config, self->input_state->caps,
779 self->v4l2output->info.size, min, min);
781 /* There is no reason to refuse this config */
782 if (!gst_buffer_pool_set_config (pool, config)) {
784 gst_object_unref (pool);
785 goto activate_failed;
788 if (!gst_buffer_pool_set_active (pool, TRUE)) {
790 gst_object_unref (pool);
791 goto activate_failed;
794 gst_object_unref (pool);
798 GstBufferPool *cpool =
799 gst_v4l2_object_get_buffer_pool (self->v4l2capture);
800 active = gst_buffer_pool_set_active (cpool, TRUE);
802 gst_object_unref (cpool);
805 GST_WARNING_OBJECT (self, "Could not activate capture buffer pool.");
806 goto activate_failed;
809 GST_DEBUG_OBJECT (self, "Starting encoding thread");
811 /* Start the processing task, when it quits, the task will disable input
812 * processing to unlock input if draining, or prevent potential block */
813 if (!gst_pad_start_task (encoder->srcpad,
814 (GstTaskFunction) gst_v4l2_video_enc_loop, self,
815 (GDestroyNotify) gst_v4l2_video_enc_loop_stopped))
816 goto start_task_failed;
819 if (frame->input_buffer) {
820 /* Process force keyframe event if it was passed */
821 if (GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME (frame)) {
822 struct v4l2_control ctrl = { V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME, 1 };
823 if (self->v4l2output->ioctl (self->v4l2output->video_fd, VIDIOC_S_CTRL,
825 GST_ELEMENT_WARNING (self, RESOURCE, FAILED,
826 (_("Failed to force keyframe.")),
827 ("VIDIOC_S_CTRL (V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME) failed: %s (%d)",
828 g_strerror (errno), errno));
831 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
832 GST_LOG_OBJECT (encoder, "Passing buffer with frame number %u",
833 frame->system_frame_number);
836 GstBufferPool *opool = gst_v4l2_object_get_buffer_pool (self->v4l2output);
837 ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (opool),
838 &frame->input_buffer, &frame->system_frame_number);
840 gst_object_unref (opool);
843 GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
845 if (ret == GST_FLOW_FLUSHING) {
846 if (gst_pad_get_task_state (encoder->srcpad) != GST_TASK_STARTED)
847 ret = self->output_flow;
849 } else if (ret != GST_FLOW_OK) {
854 gst_video_codec_frame_unref (frame);
860 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
861 (_("Failed to allocate required memory.")),
862 ("Buffer pool activation failed"));
863 return GST_FLOW_ERROR;
868 ret = GST_FLOW_FLUSHING;
873 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
874 (_("Failed to start encoding thread.")), (NULL));
875 g_atomic_int_set (&self->processing, FALSE);
876 ret = GST_FLOW_ERROR;
881 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
882 (_("Failed to process frame.")),
883 ("Maybe be due to not enough memory or failing driver"));
884 ret = GST_FLOW_ERROR;
889 gst_video_encoder_finish_frame (encoder, frame);
895 gst_v4l2_video_enc_decide_allocation (GstVideoEncoder *
896 encoder, GstQuery * query)
898 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
899 GstVideoCodecState *state = gst_video_encoder_get_output_state (encoder);
901 GstV4l2Error error = GST_V4L2_ERROR_INIT;
902 GstClockTime latency;
903 gboolean ret = FALSE;
905 /* We need to set the format here, since this is called right after
906 * GstVideoEncoder have set the width, height and framerate into the state
907 * caps. These are needed by the driver to calculate the buffer size and to
908 * implement bitrate adaptation. */
909 caps = gst_caps_copy (state->caps);
910 gst_structure_remove_field (gst_caps_get_structure (caps, 0), "colorimetry");
911 if (!gst_v4l2_object_set_format (self->v4l2capture, caps, &error)) {
912 gst_v4l2_error (self, &error);
913 gst_caps_unref (caps);
917 gst_caps_unref (caps);
920 gst_v4l2_object_setup_padding (self->v4l2capture);
922 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query)) {
923 GstVideoEncoderClass *enc_class = GST_VIDEO_ENCODER_CLASS (parent_class);
924 ret = enc_class->decide_allocation (encoder, query);
927 /* FIXME This may not be entirely correct, as encoder may keep some
928 * observation without delaying the encoding. Linux Media API need some
929 * more work to explicitly expressed the decoder / encoder latency. This
930 * value will then become max latency, and the reported driver latency would
931 * become the min latency. */
932 if (!GST_CLOCK_TIME_IS_VALID (self->v4l2capture->duration))
933 self->v4l2capture->duration = gst_util_uint64_scale_int (GST_SECOND, 1, 25);
934 latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
935 gst_video_encoder_set_latency (encoder, latency, latency);
936 GST_DEBUG_OBJECT (self, "Setting latency: %" GST_TIME_FORMAT,
937 GST_TIME_ARGS (latency));
940 gst_video_codec_state_unref (state);
945 gst_v4l2_video_enc_propose_allocation (GstVideoEncoder *
946 encoder, GstQuery * query)
948 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
949 gboolean ret = FALSE;
951 GST_DEBUG_OBJECT (self, "called");
956 ret = gst_v4l2_object_propose_allocation (self->v4l2output, query);
959 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder,
966 gst_v4l2_video_enc_src_query (GstVideoEncoder * encoder, GstQuery * query)
969 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
970 switch (GST_QUERY_TYPE (query)) {
971 case GST_QUERY_CAPS:{
972 GstCaps *filter, *result = NULL;
973 GstPad *pad = GST_VIDEO_ENCODER_SRC_PAD (encoder);
975 gst_query_parse_caps (query, &filter);
977 /* FIXME Try and not probe the entire encoder, but only the implement
979 if (self->probed_srccaps) {
980 GstCaps *tmpl = gst_pad_get_pad_template_caps (pad);
981 result = gst_caps_intersect (tmpl, self->probed_srccaps);
982 gst_caps_unref (tmpl);
984 result = gst_pad_get_pad_template_caps (pad);
987 GstCaps *tmp = result;
989 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
990 gst_caps_unref (tmp);
993 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
995 gst_query_set_caps_result (query, result);
996 gst_caps_unref (result);
1001 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->src_query (encoder, query);
1009 gst_v4l2_video_enc_sink_query (GstVideoEncoder * encoder, GstQuery * query)
1011 gboolean ret = TRUE;
1012 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
1014 switch (GST_QUERY_TYPE (query)) {
1015 case GST_QUERY_CAPS:{
1016 GstCaps *filter, *result = NULL;
1017 GstPad *pad = GST_VIDEO_ENCODER_SINK_PAD (encoder);
1019 gst_query_parse_caps (query, &filter);
1021 if (self->probed_sinkcaps)
1022 result = gst_caps_ref (self->probed_sinkcaps);
1024 result = gst_pad_get_pad_template_caps (pad);
1027 GstCaps *tmp = result;
1029 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
1030 gst_caps_unref (tmp);
1033 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
1035 gst_query_set_caps_result (query, result);
1036 gst_caps_unref (result);
1041 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_query (encoder, query);
1049 gst_v4l2_video_enc_sink_event (GstVideoEncoder * encoder, GstEvent * event)
1051 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
1053 GstEventType type = GST_EVENT_TYPE (event);
1056 case GST_EVENT_FLUSH_START:
1057 GST_DEBUG_OBJECT (self, "flush start");
1058 gst_v4l2_object_unlock (self->v4l2output);
1059 gst_v4l2_object_unlock (self->v4l2capture);
1065 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_event (encoder, event);
1068 case GST_EVENT_FLUSH_START:
1069 gst_pad_stop_task (encoder->srcpad);
1070 GST_DEBUG_OBJECT (self, "flush start done");
1078 static GstStateChangeReturn
1079 gst_v4l2_video_enc_change_state (GstElement * element,
1080 GstStateChange transition)
1082 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (element);
1084 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
1085 g_atomic_int_set (&self->active, FALSE);
1086 gst_v4l2_object_unlock (self->v4l2output);
1087 gst_v4l2_object_unlock (self->v4l2capture);
1090 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1095 gst_v4l2_video_enc_dispose (GObject * object)
1097 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
1099 gst_caps_replace (&self->probed_sinkcaps, NULL);
1100 gst_caps_replace (&self->probed_srccaps, NULL);
1102 G_OBJECT_CLASS (parent_class)->dispose (object);
1106 gst_v4l2_video_enc_finalize (GObject * object)
1108 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
1110 gst_v4l2_object_destroy (self->v4l2capture);
1111 gst_v4l2_object_destroy (self->v4l2output);
1113 G_OBJECT_CLASS (parent_class)->finalize (object);
1118 gst_v4l2_video_enc_init (GstV4l2VideoEnc * self)
1120 /* V4L2 object are created in subinstance_init */
1124 gst_v4l2_video_enc_subinstance_init (GTypeInstance * instance, gpointer g_class)
1126 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class);
1127 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (instance);
1129 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
1130 GST_OBJECT (GST_VIDEO_ENCODER_SINK_PAD (self)),
1131 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
1132 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
1133 self->v4l2output->no_initial_format = TRUE;
1134 self->v4l2output->keep_aspect = FALSE;
1136 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
1137 GST_OBJECT (GST_VIDEO_ENCODER_SRC_PAD (self)),
1138 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
1139 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
1143 gst_v4l2_video_enc_class_init (GstV4l2VideoEncClass * klass)
1145 GstElementClass *element_class;
1146 GObjectClass *gobject_class;
1147 GstVideoEncoderClass *video_encoder_class;
1149 parent_class = g_type_class_peek_parent (klass);
1151 element_class = (GstElementClass *) klass;
1152 gobject_class = (GObjectClass *) klass;
1153 video_encoder_class = (GstVideoEncoderClass *) klass;
1155 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_enc_debug, "v4l2videoenc", 0,
1156 "V4L2 Video Encoder");
1158 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_dispose);
1159 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finalize);
1160 gobject_class->set_property =
1161 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_property);
1162 gobject_class->get_property =
1163 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_get_property);
1165 video_encoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_open);
1166 video_encoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_close);
1167 video_encoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_start);
1168 video_encoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_stop);
1169 video_encoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finish);
1170 video_encoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_flush);
1171 video_encoder_class->set_format =
1172 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_format);
1173 video_encoder_class->negotiate =
1174 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_negotiate);
1175 video_encoder_class->decide_allocation =
1176 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_decide_allocation);
1177 video_encoder_class->propose_allocation =
1178 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_propose_allocation);
1179 video_encoder_class->sink_query =
1180 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_query);
1181 video_encoder_class->src_query =
1182 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_src_query);
1183 video_encoder_class->sink_event =
1184 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_event);
1185 video_encoder_class->handle_frame =
1186 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_handle_frame);
1188 element_class->change_state =
1189 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_change_state);
1191 gst_v4l2_object_install_m2m_properties_helper (gobject_class);
1195 gst_v4l2_video_enc_subclass_init (gpointer g_class, gpointer data)
1197 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class);
1198 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
1199 GstV4l2VideoEncCData *cdata = data;
1201 klass->default_device = cdata->device;
1202 klass->codec = cdata->codec;
1204 gst_element_class_add_pad_template (element_class,
1205 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
1207 gst_element_class_add_pad_template (element_class,
1208 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
1211 gst_caps_unref (cdata->sink_caps);
1212 gst_caps_unref (cdata->src_caps);
1216 /* Probing functions */
1218 gst_v4l2_is_video_enc (GstCaps * sink_caps, GstCaps * src_caps,
1219 GstCaps * codec_caps)
1221 gboolean ret = FALSE;
1222 gboolean (*check_caps) (const GstCaps *, const GstCaps *);
1225 check_caps = gst_caps_can_intersect;
1227 codec_caps = gst_v4l2_object_get_codec_caps ();
1228 check_caps = gst_caps_is_subset;
1231 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_raw_caps ())
1232 && check_caps (src_caps, codec_caps))
1239 gst_v4l2_video_enc_register (GstPlugin * plugin, GType type,
1240 const char *codec_name, const gchar * basename, const gchar * device_path,
1241 const GstV4l2Codec * codec, gint video_fd, GstCaps * sink_caps,
1242 GstCaps * codec_caps, GstCaps * src_caps)
1244 GstCaps *filtered_caps;
1245 GTypeQuery type_query;
1246 GTypeInfo type_info = { 0, };
1249 GstV4l2VideoEncCData *cdata;
1250 GValue value = G_VALUE_INIT;
1252 filtered_caps = gst_caps_intersect (src_caps, codec_caps);
1254 if (codec != NULL && video_fd != -1) {
1255 if (gst_v4l2_codec_probe_levels (codec, video_fd, &value)) {
1256 gst_caps_set_value (filtered_caps, "level", &value);
1257 g_value_unset (&value);
1260 if (gst_v4l2_codec_probe_profiles (codec, video_fd, &value)) {
1261 gst_caps_set_value (filtered_caps, "profile", &value);
1262 g_value_unset (&value);
1266 cdata = g_new0 (GstV4l2VideoEncCData, 1);
1267 cdata->device = g_strdup (device_path);
1268 cdata->sink_caps = gst_caps_ref (sink_caps);
1269 cdata->src_caps = gst_caps_ref (filtered_caps);
1270 cdata->codec = codec;
1272 g_type_query (type, &type_query);
1273 memset (&type_info, 0, sizeof (type_info));
1274 type_info.class_size = type_query.class_size;
1275 type_info.instance_size = type_query.instance_size;
1276 type_info.class_init = gst_v4l2_video_enc_subclass_init;
1277 type_info.class_data = cdata;
1278 type_info.instance_init = gst_v4l2_video_enc_subinstance_init;
1280 /* The first encoder to be registered should use a constant name, like
1281 * v4l2h264enc, for any additional encoders, we create unique names. Encoder
1282 * names may change between boots, so this should help gain stable names for
1283 * the most common use cases. */
1284 type_name = g_strdup_printf ("v4l2%senc", codec_name);
1286 if (g_type_from_name (type_name) != 0) {
1288 type_name = g_strdup_printf ("v4l2%s%senc", basename, codec_name);
1291 subtype = g_type_register_static (type, type_name, &type_info, 0);
1293 if (!gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype))
1294 GST_WARNING ("Failed to register plugin '%s'", type_name);