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_OUTPUT_IO_MODE:
68 gst_v4l2_object_set_property_helper (self->v4l2output,
69 prop_id, value, pspec);
71 case PROP_CAPTURE_IO_MODE:
72 gst_v4l2_object_set_property_helper (self->v4l2capture,
73 prop_id, value, pspec);
76 /* By default, only set on output */
78 if (!gst_v4l2_object_set_property_helper (self->v4l2output,
79 prop_id, value, pspec)) {
80 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
87 gst_v4l2_video_enc_get_property (GObject * object,
88 guint prop_id, GValue * value, GParamSpec * pspec)
90 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
93 case PROP_OUTPUT_IO_MODE:
94 gst_v4l2_object_get_property_helper (self->v4l2output,
95 prop_id, value, pspec);
97 case PROP_CAPTURE_IO_MODE:
98 gst_v4l2_object_get_property_helper (self->v4l2capture,
99 prop_id, value, pspec);
102 /* By default read from output */
104 if (!gst_v4l2_object_get_property_helper (self->v4l2output,
105 prop_id, value, pspec)) {
106 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
113 gst_v4l2_video_enc_open (GstVideoEncoder * encoder)
115 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
118 GST_DEBUG_OBJECT (self, "Opening");
120 if (!gst_v4l2_object_open (self->v4l2output))
123 if (!gst_v4l2_object_open_shared (self->v4l2capture, self->v4l2output))
126 self->probed_sinkcaps = gst_v4l2_object_probe_caps (self->v4l2output,
127 gst_v4l2_object_get_raw_caps ());
129 if (gst_caps_is_empty (self->probed_sinkcaps))
132 codec_caps = gst_pad_get_pad_template_caps (encoder->srcpad);
133 self->probed_srccaps = gst_v4l2_object_probe_caps (self->v4l2capture,
135 gst_caps_unref (codec_caps);
137 if (gst_caps_is_empty (self->probed_srccaps))
138 goto no_encoded_format;
143 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
144 (_("Encoder on device %s has no supported output format"),
145 self->v4l2output->videodev), (NULL));
150 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
151 (_("Encoder on device %s has no supported input format"),
152 self->v4l2output->videodev), (NULL));
156 if (GST_V4L2_IS_OPEN (self->v4l2output))
157 gst_v4l2_object_close (self->v4l2output);
159 if (GST_V4L2_IS_OPEN (self->v4l2capture))
160 gst_v4l2_object_close (self->v4l2capture);
162 gst_caps_replace (&self->probed_srccaps, NULL);
163 gst_caps_replace (&self->probed_sinkcaps, NULL);
169 gst_v4l2_video_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_OBJECT_LOCK (task);
282 while (GST_TASK_STATE (task) == GST_TASK_STARTED)
283 GST_TASK_WAIT (task);
284 GST_OBJECT_UNLOCK (task);
285 ret = GST_FLOW_FLUSHING;
288 /* and ensure the processing thread has stopped in case another error
290 gst_v4l2_object_unlock (self->v4l2capture);
291 gst_pad_stop_task (encoder->srcpad);
292 GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
294 if (ret == GST_FLOW_FLUSHING)
295 ret = self->output_flow;
297 GST_DEBUG_OBJECT (encoder, "Done draining buffers");
304 gst_v4l2_video_enc_set_format (GstVideoEncoder * encoder,
305 GstVideoCodecState * state)
308 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
309 GstV4l2Error error = GST_V4L2_ERROR_INIT;
311 GstVideoCodecState *output;
313 GST_DEBUG_OBJECT (self, "Setting format: %" GST_PTR_FORMAT, state->caps);
315 if (self->input_state) {
316 if (gst_v4l2_object_caps_equal (self->v4l2output, state->caps)) {
317 GST_DEBUG_OBJECT (self, "Compatible caps");
321 if (gst_v4l2_video_enc_finish (encoder) != GST_FLOW_OK)
324 gst_v4l2_object_stop (self->v4l2output);
325 gst_v4l2_object_stop (self->v4l2capture);
327 gst_video_codec_state_unref (self->input_state);
328 self->input_state = NULL;
331 outcaps = gst_pad_get_pad_template_caps (encoder->srcpad);
332 outcaps = gst_caps_make_writable (outcaps);
333 output = gst_video_encoder_set_output_state (encoder, outcaps, state);
334 gst_video_codec_state_unref (output);
336 if (!gst_video_encoder_negotiate (encoder))
339 if (!gst_v4l2_object_set_format (self->v4l2output, state->caps, &error)) {
340 gst_v4l2_error (self, &error);
344 /* activating a capture pool will also call STREAMON. CODA driver will
345 * refuse to configure the output if the capture is stremaing. */
346 if (!gst_buffer_pool_set_active (GST_BUFFER_POOL (self->v4l2capture->pool),
348 GST_WARNING_OBJECT (self, "Could not activate capture buffer pool.");
352 self->input_state = gst_video_codec_state_ref (state);
354 GST_DEBUG_OBJECT (self, "output caps: %" GST_PTR_FORMAT, state->caps);
360 gst_v4l2_video_enc_flush (GstVideoEncoder * encoder)
362 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
364 GST_DEBUG_OBJECT (self, "Flushing");
366 /* Ensure the processing thread has stopped for the reverse playback
368 if (g_atomic_int_get (&self->processing)) {
369 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
371 gst_v4l2_object_unlock_stop (self->v4l2output);
372 gst_v4l2_object_unlock_stop (self->v4l2capture);
373 gst_pad_stop_task (encoder->srcpad);
375 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
379 self->output_flow = GST_FLOW_OK;
381 gst_v4l2_object_unlock_stop (self->v4l2output);
382 gst_v4l2_object_unlock_stop (self->v4l2capture);
387 struct ProfileLevelCtx
389 GstV4l2VideoEnc *self;
390 const gchar *profile;
395 get_string_list (GstStructure * s, const gchar * field, GQueue * queue)
399 value = gst_structure_get_value (s, field);
404 if (GST_VALUE_HOLDS_LIST (value)) {
407 if (gst_value_list_get_size (value) == 0)
410 for (i = 0; i < gst_value_list_get_size (value); i++) {
411 const GValue *item = gst_value_list_get_value (value, i);
413 if (G_VALUE_HOLDS_STRING (item))
414 g_queue_push_tail (queue, g_value_dup_string (item));
416 } else if (G_VALUE_HOLDS_STRING (value)) {
417 g_queue_push_tail (queue, g_value_dup_string (value));
424 negotiate_profile_and_level (GstCapsFeatures * features, GstStructure * s,
427 struct ProfileLevelCtx *ctx = user_data;
428 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_GET_CLASS (ctx->self);
429 GstV4l2Object *v4l2object = GST_V4L2_VIDEO_ENC (ctx->self)->v4l2output;
430 GQueue profiles = G_QUEUE_INIT;
431 GQueue levels = G_QUEUE_INIT;
432 gboolean failed = FALSE;
434 if (klass->profile_cid && get_string_list (s, "profile", &profiles)) {
437 for (l = profiles.head; l; l = l->next) {
438 struct v4l2_control control = { 0, };
440 const gchar *profile = l->data;
442 GST_TRACE_OBJECT (ctx->self, "Trying profile %s", profile);
444 control.id = klass->profile_cid;
445 control.value = v4l2_profile = klass->profile_from_string (profile);
447 if (control.value < 0)
450 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
451 GST_WARNING_OBJECT (ctx->self, "Failed to set %s profile: '%s'",
452 klass->codec_name, g_strerror (errno));
456 profile = klass->profile_to_string (control.value);
458 if (control.value == v4l2_profile) {
459 ctx->profile = profile;
463 if (g_list_find_custom (l, profile, g_str_equal)) {
464 ctx->profile = profile;
469 if (profiles.length && !ctx->profile)
472 g_queue_foreach (&profiles, (GFunc) g_free, NULL);
473 g_queue_clear (&profiles);
476 if (!failed && klass->level_cid && get_string_list (s, "level", &levels)) {
479 for (l = levels.head; l; l = l->next) {
480 struct v4l2_control control = { 0, };
482 const gchar *level = l->data;
484 GST_TRACE_OBJECT (ctx->self, "Trying level %s", level);
486 control.id = klass->level_cid;
487 control.value = v4l2_level = klass->level_from_string (level);
489 if (control.value < 0)
492 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_S_CTRL, &control) < 0) {
493 GST_WARNING_OBJECT (ctx->self, "Failed to set %s level: '%s'",
494 klass->codec_name, g_strerror (errno));
498 level = klass->level_to_string (control.value);
500 if (control.value == v4l2_level) {
505 if (g_list_find_custom (l, level, g_str_equal)) {
511 if (levels.length && !ctx->level)
514 g_queue_foreach (&levels, (GFunc) g_free, NULL);
515 g_queue_clear (&levels);
518 /* If it failed, we continue */
523 gst_v4l2_video_enc_negotiate (GstVideoEncoder * encoder)
525 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_GET_CLASS (encoder);
526 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
527 GstV4l2Object *v4l2object = self->v4l2output;
528 GstCaps *allowed_caps;
529 struct ProfileLevelCtx ctx = { self, NULL, NULL };
530 GstVideoCodecState *state;
533 GST_DEBUG_OBJECT (self, "Negotiating %s profile and level.",
536 allowed_caps = gst_pad_get_allowed_caps (GST_VIDEO_ENCODER_SRC_PAD (encoder));
540 if (gst_caps_is_empty (allowed_caps))
543 allowed_caps = gst_caps_make_writable (allowed_caps);
545 /* negotiate_profile_and_level() will return TRUE on failure to keep
546 * iterating, if gst_caps_foreach() returns TRUE it means there was no
547 * compatible profile and level in any of the structure */
548 if (gst_caps_foreach (allowed_caps, negotiate_profile_and_level, &ctx)) {
549 goto no_profile_level;
553 if (klass->profile_cid && !ctx.profile) {
554 struct v4l2_control control = { 0, };
556 control.id = klass->profile_cid;
558 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
561 ctx.profile = klass->profile_to_string (control.value);
564 if (klass->level_cid && !ctx.level) {
565 struct v4l2_control control = { 0, };
567 control.id = klass->level_cid;
569 if (v4l2object->ioctl (v4l2object->video_fd, VIDIOC_G_CTRL, &control) < 0)
572 ctx.level = klass->level_to_string (control.value);
575 GST_DEBUG_OBJECT (self, "Selected %s profile %s at level %s",
576 klass->codec_name, ctx.profile, ctx.level);
578 state = gst_video_encoder_get_output_state (encoder);
579 s = gst_caps_get_structure (state->caps, 0);
581 if (klass->profile_cid)
582 gst_structure_set (s, "profile", G_TYPE_STRING, ctx.profile, NULL);
584 if (klass->level_cid)
585 gst_structure_set (s, "level", G_TYPE_STRING, ctx.level, NULL);
587 if (!GST_VIDEO_ENCODER_CLASS (parent_class)->negotiate (encoder))
593 GST_WARNING_OBJECT (self, "Failed to get %s profile and level: '%s'",
594 klass->codec_name, g_strerror (errno));
598 GST_WARNING_OBJECT (self, "No compatible level and profile in caps: %"
599 GST_PTR_FORMAT, allowed_caps);
604 gst_caps_unref (allowed_caps);
608 static GstVideoCodecFrame *
609 gst_v4l2_video_enc_get_oldest_frame (GstVideoEncoder * encoder)
611 GstVideoCodecFrame *frame = NULL;
615 frames = gst_video_encoder_get_frames (encoder);
617 for (l = frames; l != NULL; l = l->next) {
618 GstVideoCodecFrame *f = l->data;
620 if (!frame || frame->pts > f->pts)
627 GST_LOG_OBJECT (encoder,
628 "Oldest frame is %d %" GST_TIME_FORMAT
629 " and %d frames left",
630 frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
631 gst_video_codec_frame_ref (frame);
634 g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
640 gst_v4l2_video_enc_loop (GstVideoEncoder * encoder)
642 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
643 GstVideoCodecFrame *frame;
644 GstBuffer *buffer = NULL;
647 GST_LOG_OBJECT (encoder, "Allocate output buffer");
649 buffer = gst_video_encoder_allocate_output_buffer (encoder,
650 self->v4l2capture->info.size);
652 if (NULL == buffer) {
653 ret = GST_FLOW_FLUSHING;
658 /* FIXME Check if buffer isn't the last one here */
660 GST_LOG_OBJECT (encoder, "Process output buffer");
662 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL
663 (self->v4l2capture->pool), &buffer);
665 if (ret != GST_FLOW_OK)
668 frame = gst_v4l2_video_enc_get_oldest_frame (encoder);
671 frame->output_buffer = buffer;
673 ret = gst_video_encoder_finish_frame (encoder, frame);
675 if (ret != GST_FLOW_OK)
678 GST_WARNING_OBJECT (encoder, "Encoder is producing too many buffers");
679 gst_buffer_unref (buffer);
685 GST_DEBUG_OBJECT (encoder, "Leaving output thread");
687 gst_buffer_replace (&buffer, NULL);
688 self->output_flow = ret;
689 g_atomic_int_set (&self->processing, FALSE);
690 gst_v4l2_object_unlock (self->v4l2output);
691 gst_pad_pause_task (encoder->srcpad);
695 gst_v4l2_video_enc_loop_stopped (GstV4l2VideoEnc * self)
697 if (g_atomic_int_get (&self->processing)) {
698 GST_DEBUG_OBJECT (self, "Early stop of encoding thread");
699 self->output_flow = GST_FLOW_FLUSHING;
700 g_atomic_int_set (&self->processing, FALSE);
703 GST_DEBUG_OBJECT (self, "Encoding task destroyed: %s",
704 gst_flow_get_name (self->output_flow));
709 gst_v4l2_video_enc_handle_frame (GstVideoEncoder * encoder,
710 GstVideoCodecFrame * frame)
712 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
713 GstFlowReturn ret = GST_FLOW_OK;
714 GstTaskState task_state;
716 GST_DEBUG_OBJECT (self, "Handling frame %d", frame->system_frame_number);
718 if (G_UNLIKELY (!g_atomic_int_get (&self->active)))
721 task_state = gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self));
722 if (task_state == GST_TASK_STOPPED || task_state == GST_TASK_PAUSED) {
723 GstBufferPool *pool = GST_BUFFER_POOL (self->v4l2output->pool);
725 /* It possible that the processing thread stopped due to an error */
726 if (self->output_flow != GST_FLOW_OK &&
727 self->output_flow != GST_FLOW_FLUSHING) {
728 GST_DEBUG_OBJECT (self, "Processing loop stopped with error, leaving");
729 ret = self->output_flow;
733 /* Ensure input internal pool is active */
734 if (!gst_buffer_pool_is_active (pool)) {
735 GstStructure *config = gst_buffer_pool_get_config (pool);
736 guint min = MAX (self->v4l2output->min_buffers, GST_V4L2_MIN_BUFFERS);
738 gst_buffer_pool_config_set_params (config, self->input_state->caps,
739 self->v4l2output->info.size, min, min);
741 /* There is no reason to refuse this config */
742 if (!gst_buffer_pool_set_config (pool, config))
743 goto activate_failed;
745 if (!gst_buffer_pool_set_active (pool, TRUE))
746 goto activate_failed;
749 GST_DEBUG_OBJECT (self, "Starting encoding thread");
751 /* Start the processing task, when it quits, the task will disable input
752 * processing to unlock input if draining, or prevent potential block */
753 if (!gst_pad_start_task (encoder->srcpad,
754 (GstTaskFunction) gst_v4l2_video_enc_loop, self,
755 (GDestroyNotify) gst_v4l2_video_enc_loop_stopped))
756 goto start_task_failed;
759 if (frame->input_buffer) {
760 GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
762 gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL
763 (self->v4l2output->pool), &frame->input_buffer);
764 GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
766 if (ret == GST_FLOW_FLUSHING) {
767 if (gst_pad_get_task_state (GST_VIDEO_DECODER_SRC_PAD (self)) !=
769 ret = self->output_flow;
771 } else if (ret != GST_FLOW_OK) {
776 gst_video_codec_frame_unref (frame);
782 GST_ELEMENT_ERROR (self, RESOURCE, SETTINGS,
783 (_("Failed to allocate required memory.")),
784 ("Buffer pool activation failed"));
785 return GST_FLOW_ERROR;
790 ret = GST_FLOW_FLUSHING;
795 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
796 (_("Failed to start encoding thread.")), (NULL));
797 g_atomic_int_set (&self->processing, FALSE);
798 ret = GST_FLOW_ERROR;
803 GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
804 (_("Failed to process frame.")),
805 ("Maybe be due to not enough memory or failing driver"));
806 ret = GST_FLOW_ERROR;
811 gst_video_encoder_finish_frame (encoder, frame);
817 gst_v4l2_video_enc_decide_allocation (GstVideoEncoder *
818 encoder, GstQuery * query)
820 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
821 GstVideoCodecState *state = gst_video_encoder_get_output_state (encoder);
822 GstV4l2Error error = GST_V4L2_ERROR_INIT;
823 GstClockTime latency;
824 gboolean ret = FALSE;
826 /* We need to set the format here, since this is called right after
827 * GstVideoEncoder have set the width, height and framerate into the state
828 * caps. These are needed by the driver to calculate the buffer size and to
829 * implement bitrate adaptation. */
830 if (!gst_v4l2_object_set_format (self->v4l2capture, state->caps, &error)) {
831 gst_v4l2_error (self, &error);
836 if (gst_v4l2_object_decide_allocation (self->v4l2capture, query)) {
837 GstVideoEncoderClass *enc_class = GST_VIDEO_ENCODER_CLASS (parent_class);
838 ret = enc_class->decide_allocation (encoder, query);
841 /* FIXME This may not be entirely correct, as encoder may keep some
842 * observation withouth delaying the encoding. Linux Media API need some
843 * more work to explicitly expressed the decoder / encoder latency. This
844 * value will then become max latency, and the reported driver latency would
845 * become the min latency. */
846 latency = self->v4l2capture->min_buffers * self->v4l2capture->duration;
847 gst_video_encoder_set_latency (encoder, latency, latency);
850 gst_video_codec_state_unref (state);
855 gst_v4l2_video_enc_propose_allocation (GstVideoEncoder *
856 encoder, GstQuery * query)
858 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
859 gboolean ret = FALSE;
861 GST_DEBUG_OBJECT (self, "called");
866 ret = gst_v4l2_object_propose_allocation (self->v4l2output, query);
869 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->propose_allocation (encoder,
876 gst_v4l2_video_enc_src_query (GstVideoEncoder * encoder, GstQuery * query)
879 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
880 switch (GST_QUERY_TYPE (query)) {
881 case GST_QUERY_CAPS:{
882 GstCaps *filter, *result = NULL;
883 GstPad *pad = GST_VIDEO_ENCODER_SRC_PAD (encoder);
885 gst_query_parse_caps (query, &filter);
887 /* FIXME Try and not probe the entire encoder, but only the implement
889 if (self->probed_srccaps) {
890 GstCaps *tmpl = gst_pad_get_pad_template_caps (pad);
891 result = gst_caps_intersect (tmpl, self->probed_srccaps);
892 gst_caps_unref (tmpl);
894 result = gst_pad_get_pad_template_caps (pad);
897 GstCaps *tmp = result;
899 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
900 gst_caps_unref (tmp);
903 GST_DEBUG_OBJECT (self, "Returning src caps %" GST_PTR_FORMAT, result);
905 gst_query_set_caps_result (query, result);
906 gst_caps_unref (result);
911 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->src_query (encoder, query);
919 gst_v4l2_video_enc_sink_query (GstVideoEncoder * encoder, GstQuery * query)
922 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
924 switch (GST_QUERY_TYPE (query)) {
925 case GST_QUERY_CAPS:{
926 GstCaps *filter, *result = NULL;
927 GstPad *pad = GST_VIDEO_ENCODER_SINK_PAD (encoder);
929 gst_query_parse_caps (query, &filter);
931 if (self->probed_sinkcaps)
932 result = gst_caps_ref (self->probed_sinkcaps);
934 result = gst_pad_get_pad_template_caps (pad);
937 GstCaps *tmp = result;
939 gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
940 gst_caps_unref (tmp);
943 GST_DEBUG_OBJECT (self, "Returning sink caps %" GST_PTR_FORMAT, result);
945 gst_query_set_caps_result (query, result);
946 gst_caps_unref (result);
951 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_query (encoder, query);
959 gst_v4l2_video_enc_sink_event (GstVideoEncoder * encoder, GstEvent * event)
961 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (encoder);
964 switch (GST_EVENT_TYPE (event)) {
965 case GST_EVENT_FLUSH_START:
966 GST_DEBUG_OBJECT (self, "flush start");
967 gst_v4l2_object_unlock (self->v4l2output);
968 gst_v4l2_object_unlock (self->v4l2capture);
974 ret = GST_VIDEO_ENCODER_CLASS (parent_class)->sink_event (encoder, event);
976 switch (GST_EVENT_TYPE (event)) {
977 case GST_EVENT_FLUSH_START:
978 gst_pad_stop_task (encoder->srcpad);
979 GST_DEBUG_OBJECT (self, "flush start done");
987 static GstStateChangeReturn
988 gst_v4l2_video_enc_change_state (GstElement * element,
989 GstStateChange transition)
991 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (element);
993 if (transition == GST_STATE_CHANGE_PAUSED_TO_READY) {
994 g_atomic_int_set (&self->active, FALSE);
995 gst_v4l2_object_unlock (self->v4l2output);
996 gst_v4l2_object_unlock (self->v4l2capture);
999 return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
1004 gst_v4l2_video_enc_dispose (GObject * object)
1006 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
1008 gst_caps_replace (&self->probed_sinkcaps, NULL);
1009 gst_caps_replace (&self->probed_srccaps, NULL);
1011 G_OBJECT_CLASS (parent_class)->dispose (object);
1015 gst_v4l2_video_enc_finalize (GObject * object)
1017 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (object);
1019 gst_v4l2_object_destroy (self->v4l2capture);
1020 gst_v4l2_object_destroy (self->v4l2output);
1022 G_OBJECT_CLASS (parent_class)->finalize (object);
1027 gst_v4l2_video_enc_init (GstV4l2VideoEnc * self)
1029 /* V4L2 object are created in subinstance_init */
1033 gst_v4l2_video_enc_subinstance_init (GTypeInstance * instance, gpointer g_class)
1035 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class);
1036 GstV4l2VideoEnc *self = GST_V4L2_VIDEO_ENC (instance);
1038 self->v4l2output = gst_v4l2_object_new (GST_ELEMENT (self),
1039 GST_OBJECT (GST_VIDEO_ENCODER_SINK_PAD (self)),
1040 V4L2_BUF_TYPE_VIDEO_OUTPUT, klass->default_device,
1041 gst_v4l2_get_output, gst_v4l2_set_output, NULL);
1042 self->v4l2output->no_initial_format = TRUE;
1043 self->v4l2output->keep_aspect = FALSE;
1045 self->v4l2capture = gst_v4l2_object_new (GST_ELEMENT (self),
1046 GST_OBJECT (GST_VIDEO_ENCODER_SRC_PAD (self)),
1047 V4L2_BUF_TYPE_VIDEO_CAPTURE, klass->default_device,
1048 gst_v4l2_get_input, gst_v4l2_set_input, NULL);
1049 self->v4l2capture->no_initial_format = TRUE;
1050 self->v4l2output->keep_aspect = FALSE;
1054 gst_v4l2_video_enc_class_init (GstV4l2VideoEncClass * klass)
1056 GstElementClass *element_class;
1057 GObjectClass *gobject_class;
1058 GstVideoEncoderClass *video_encoder_class;
1060 parent_class = g_type_class_peek_parent (klass);
1062 element_class = (GstElementClass *) klass;
1063 gobject_class = (GObjectClass *) klass;
1064 video_encoder_class = (GstVideoEncoderClass *) klass;
1066 GST_DEBUG_CATEGORY_INIT (gst_v4l2_video_enc_debug, "v4l2videoenc", 0,
1067 "V4L2 Video Encoder");
1069 gobject_class->dispose = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_dispose);
1070 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finalize);
1071 gobject_class->set_property =
1072 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_property);
1073 gobject_class->get_property =
1074 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_get_property);
1076 video_encoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_open);
1077 video_encoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_close);
1078 video_encoder_class->start = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_start);
1079 video_encoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_stop);
1080 video_encoder_class->finish = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_finish);
1081 video_encoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_flush);
1082 video_encoder_class->set_format =
1083 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_set_format);
1084 video_encoder_class->negotiate =
1085 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_negotiate);
1086 video_encoder_class->decide_allocation =
1087 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_decide_allocation);
1088 video_encoder_class->propose_allocation =
1089 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_propose_allocation);
1090 video_encoder_class->sink_query =
1091 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_query);
1092 video_encoder_class->src_query =
1093 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_src_query);
1094 video_encoder_class->sink_event =
1095 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_sink_event);
1096 video_encoder_class->handle_frame =
1097 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_handle_frame);
1099 element_class->change_state =
1100 GST_DEBUG_FUNCPTR (gst_v4l2_video_enc_change_state);
1102 gst_v4l2_object_install_m2m_properties_helper (gobject_class);
1106 gst_v4l2_video_enc_subclass_init (gpointer g_class, gpointer data)
1108 GstV4l2VideoEncClass *klass = GST_V4L2_VIDEO_ENC_CLASS (g_class);
1109 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
1110 GstV4l2VideoEncCData *cdata = data;
1112 klass->default_device = cdata->device;
1114 /* Note: gst_pad_template_new() take the floating ref from the caps */
1115 gst_element_class_add_pad_template (element_class,
1116 gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
1118 gst_element_class_add_pad_template (element_class,
1119 gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
1122 gst_caps_unref (cdata->sink_caps);
1123 gst_caps_unref (cdata->src_caps);
1127 /* Probing functions */
1129 gst_v4l2_is_video_enc (GstCaps * sink_caps, GstCaps * src_caps,
1130 GstCaps * codec_caps)
1132 gboolean ret = FALSE;
1133 gboolean (*check_caps) (const GstCaps *, const GstCaps *);
1136 check_caps = gst_caps_can_intersect;
1138 codec_caps = gst_v4l2_object_get_codec_caps ();
1139 check_caps = gst_caps_is_subset;
1142 if (gst_caps_is_subset (sink_caps, gst_v4l2_object_get_raw_caps ())
1143 && check_caps (src_caps, codec_caps))
1150 gst_v4l2_video_enc_register (GstPlugin * plugin, GType type,
1151 const char *codec, const gchar * basename, const gchar * device_path,
1152 GstCaps * sink_caps, GstCaps * codec_caps, GstCaps * src_caps)
1154 GstCaps *filtered_caps;
1155 GTypeQuery type_query;
1156 GTypeInfo type_info = { 0, };
1159 GstV4l2VideoEncCData *cdata;
1161 filtered_caps = gst_caps_intersect (src_caps, codec_caps);
1163 cdata = g_new0 (GstV4l2VideoEncCData, 1);
1164 cdata->device = g_strdup (device_path);
1165 cdata->sink_caps = gst_caps_ref (sink_caps);
1166 cdata->src_caps = gst_caps_ref (filtered_caps);
1168 g_type_query (type, &type_query);
1169 memset (&type_info, 0, sizeof (type_info));
1170 type_info.class_size = type_query.class_size;
1171 type_info.instance_size = type_query.instance_size;
1172 type_info.class_init = gst_v4l2_video_enc_subclass_init;
1173 type_info.class_data = cdata;
1174 type_info.instance_init = gst_v4l2_video_enc_subinstance_init;
1176 /* The first encoder to be registered should use a constant name, like
1177 * v4l2h264enc, for any additional encoders, we create unique names. Encoder
1178 * names may change between boots, so this should help gain stable names for
1179 * the most common use cases. */
1180 type_name = g_strdup_printf ("v4l2%senc", codec);
1182 if (g_type_from_name (type_name) != 0) {
1184 type_name = g_strdup_printf ("v4l2%s%senc", basename, codec);
1187 subtype = g_type_register_static (type, type_name, &type_info, 0);
1189 if (!gst_element_register (plugin, type_name, GST_RANK_PRIMARY + 1, subtype))
1190 GST_WARNING ("Failed to register plugin '%s'", type_name);