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v4l2codec: Pass system frame number as timestamp and use it to retrieve back frames reliably

Browse source 
System frame numbers are supposed to be unique and correct drivers are
passing through timestamps without modification from the output/sink to the
capture/src side.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/778>
This commit is contained in:
Sebastian Dröge 2020-10-19 17:56:04 +03:00
parent b113516241
commit bcb3428ed0
7 changed files with 64 additions and 85 deletions
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31
sys/v4l2/gstv4l2bufferpool.c
View file

@ -1139,10 +1139,9 @@ no_buffers:
static GstFlowReturn
gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf,
GstV4l2MemoryGroup * group)
GstV4l2MemoryGroup * group, guint32 * frame_number)
{
const GstV4l2Object *obj = pool->obj;
GstClockTime timestamp;
gint index;
index = group->buffer.index;
@ -1164,9 +1163,17 @@ gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf,
group->buffer.field = field;
}
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
timestamp = GST_BUFFER_TIMESTAMP (buf);
GST_TIME_TO_TIMEVAL (timestamp, group->buffer.timestamp);
if (frame_number) {
group->buffer.timestamp.tv_sec = *frame_number;
group->buffer.timestamp.tv_usec = 0;
} else {
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf)) {
GstClockTime timestamp = GST_BUFFER_TIMESTAMP (buf);
GST_TIME_TO_TIMEVAL (timestamp, group->buffer.timestamp);
} else {
group->buffer.timestamp.tv_sec = -1;
group->buffer.timestamp.tv_usec = -1;
}
}
GST_OBJECT_LOCK (pool);
@ -1506,7 +1513,8 @@ gst_v4l2_buffer_pool_release_buffer (GstBufferPool * bpool, GstBuffer * buffer)
if (pool->other_pool)
ret = gst_v4l2_buffer_pool_prepare_buffer (pool, buffer, NULL);
if (ret != GST_FLOW_OK ||
gst_v4l2_buffer_pool_qbuf (pool, buffer, group) != GST_FLOW_OK)
gst_v4l2_buffer_pool_qbuf (pool, buffer, group,
NULL) != GST_FLOW_OK)
pclass->release_buffer (bpool, buffer);
} else {
/* Simply release invalid/modified buffer, the allocator will
@ -1795,15 +1803,20 @@ cleanup:
* gst_v4l2_buffer_pool_process:
* @bpool: a #GstBufferPool
* @buf: a #GstBuffer, maybe be replaced
* @frame_number: 32 bit frame number or %NULL
*
* Process @buf in @bpool. For capture devices, this functions fills @buf with
* data from the device. For output devices, this functions send the contents of
* @buf to the device for playback.
*
* If non-%NULL and an output device, @frame_number is stored inside the timestamp for output devices and read
* back from the timestamp for capture devices.
*
* Returns: %GST_FLOW_OK on success.
*/
GstFlowReturn
gst_v4l2_buffer_pool_process (GstV4l2BufferPool * pool, GstBuffer ** buf)
gst_v4l2_buffer_pool_process (GstV4l2BufferPool * pool, GstBuffer ** buf,
guint32 * frame_number)
{
GstFlowReturn ret = GST_FLOW_OK;
GstBufferPool *bpool = GST_BUFFER_POOL_CAST (pool);
@ -2006,7 +2019,9 @@ gst_v4l2_buffer_pool_process (GstV4l2BufferPool * pool, GstBuffer ** buf)
gst_v4l2_is_buffer_valid (to_queue, &group);
}
if ((ret = gst_v4l2_buffer_pool_qbuf (pool, to_queue, group))
if ((ret =
gst_v4l2_buffer_pool_qbuf (pool, to_queue, group,
frame_number))
!= GST_FLOW_OK)
goto queue_failed;

2
sys/v4l2/gstv4l2bufferpool.h
View file

@ -103,7 +103,7 @@ GType gst_v4l2_buffer_pool_get_type (void);
GstBufferPool * gst_v4l2_buffer_pool_new (GstV4l2Object *obj, GstCaps *caps);
GstFlowReturn gst_v4l2_buffer_pool_process (GstV4l2BufferPool * bpool, GstBuffer ** buf);
GstFlowReturn gst_v4l2_buffer_pool_process (GstV4l2BufferPool * bpool, GstBuffer ** buf, guint32 * frame_number);
void gst_v4l2_buffer_pool_set_other_pool (GstV4l2BufferPool * pool,
GstBufferPool * other_pool);

2
sys/v4l2/gstv4l2sink.c
View file

@ -610,7 +610,7 @@ gst_v4l2sink_show_frame (GstVideoSink * vsink, GstBuffer * buf)
gst_buffer_ref (buf);
again:
ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL_CAST (obj->pool),
&buf);
&buf, NULL);
if (ret == GST_FLOW_FLUSHING) {
ret = gst_base_sink_wait_preroll (GST_BASE_SINK (vsink));
if (ret == GST_FLOW_OK)

2
sys/v4l2/gstv4l2src.c
View file

@ -844,7 +844,7 @@ gst_v4l2src_create (GstPushSrc * src, GstBuffer ** buf)
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto alloc_failed;
ret = gst_v4l2_buffer_pool_process (pool, buf);
ret = gst_v4l2_buffer_pool_process (pool, buf, NULL);
} while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER);

7
sys/v4l2/gstv4l2transform.c
View file

@ -927,7 +927,8 @@ gst_v4l2_transform_prepare_output_buffer (GstBaseTransform * trans,
}
GST_DEBUG_OBJECT (self, "Queue input buffer");
ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), &inbuf);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), &inbuf, NULL);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto beach;
@ -945,7 +946,9 @@ gst_v4l2_transform_prepare_output_buffer (GstBaseTransform * trans,
goto alloc_failed;
pool = self->v4l2capture->pool;
ret = gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), outbuf);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (pool), outbuf,
NULL);
} while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER);

55
sys/v4l2/gstv4l2videodec.c
View file

@ -438,7 +438,7 @@ gst_v4l2_video_dec_finish (GstVideoDecoder * decoder)
buffer = gst_buffer_new ();
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
v4l2output->pool), &buffer);
v4l2output->pool), &buffer, NULL);
gst_buffer_unref (buffer);
}
}
@ -472,36 +472,6 @@ gst_v4l2_video_dec_drain (GstVideoDecoder * decoder)
return GST_FLOW_OK;
}
static GstVideoCodecFrame *
gst_v4l2_video_dec_get_oldest_frame (GstVideoDecoder * decoder)
{
GstVideoCodecFrame *frame = NULL;
GList *frames, *l;
gint count = 0;
frames = gst_video_decoder_get_frames (decoder);
for (l = frames; l != NULL; l = l->next) {
GstVideoCodecFrame *f = l->data;
if (!frame || frame->pts > f->pts)
frame = f;
count++;
}
if (frame) {
GST_LOG_OBJECT (decoder,
"Oldest frame is %d %" GST_TIME_FORMAT " and %d frames left",
frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
gst_video_codec_frame_ref (frame);
}
g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
return frame;
}
static void
gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
{
@ -535,15 +505,22 @@ gst_v4l2_video_dec_loop (GstVideoDecoder * decoder)
goto beach;
GST_LOG_OBJECT (decoder, "Process output buffer");
ret = gst_v4l2_buffer_pool_process (v4l2_pool, &buffer);
ret = gst_v4l2_buffer_pool_process (v4l2_pool, &buffer, NULL);
} while (ret == GST_V4L2_FLOW_CORRUPTED_BUFFER);
if (ret != GST_FLOW_OK)
goto beach;
frame = gst_v4l2_video_dec_get_oldest_frame (decoder);
if (GST_BUFFER_TIMESTAMP (buffer) % GST_SECOND != 0)
GST_ERROR_OBJECT (decoder,
"Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git");
GST_LOG_OBJECT (decoder, "Got buffer for frame number %u",
(guint32) (GST_BUFFER_TIMESTAMP (buffer) / GST_SECOND));
/* FIXME: Add garbage collection for the frames */
frame =
gst_video_decoder_get_frame (decoder,
GST_BUFFER_TIMESTAMP (buffer) / GST_SECOND);
if (frame) {
frame->output_buffer = buffer;
buffer = NULL;
@ -633,6 +610,7 @@ gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
GstBuffer *codec_data;
GstCaps *acquired_caps, *available_caps, *caps, *filter;
GstStructure *st;
guint32 dummy_frame_number = 0;
GST_DEBUG_OBJECT (self, "Sending header");
@ -668,9 +646,12 @@ gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
}
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
GST_LOG_OBJECT (decoder, "Passing buffer with system frame number %u",
processed ? frame->system_frame_number : 0);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
v4l2output->pool), &codec_data);
v4l2output->pool), &codec_data,
processed ? &frame->system_frame_number : &dummy_frame_number);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
gst_buffer_unref (codec_data);
@ -765,9 +746,11 @@ gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
if (!processed) {
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
GST_LOG_OBJECT (decoder, "Passing buffer with system frame number %u",
frame->system_frame_number);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->v4l2output->
pool), &frame->input_buffer);
pool), &frame->input_buffer, &frame->system_frame_number);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
if (ret == GST_FLOW_FLUSHING) {

50
sys/v4l2/gstv4l2videoenc.c
View file

@ -612,37 +612,6 @@ not_negotiated:
return FALSE;
}
static GstVideoCodecFrame *
gst_v4l2_video_enc_get_oldest_frame (GstVideoEncoder * encoder)
{
GstVideoCodecFrame *frame = NULL;
GList *frames, *l;
gint count = 0;
frames = gst_video_encoder_get_frames (encoder);
for (l = frames; l != NULL; l = l->next) {
GstVideoCodecFrame *f = l->data;
if (!frame || frame->pts > f->pts)
frame = f;
count++;
}
if (frame) {
GST_LOG_OBJECT (encoder,
"Oldest frame is %d %" GST_TIME_FORMAT
" and %d frames left",
frame->system_frame_number, GST_TIME_ARGS (frame->pts), count - 1);
gst_video_codec_frame_ref (frame);
}
g_list_free_full (frames, (GDestroyNotify) gst_video_codec_frame_unref);
return frame;
}
static void
gst_v4l2_video_enc_loop (GstVideoEncoder * encoder)
{
@ -661,18 +630,24 @@ gst_v4l2_video_enc_loop (GstVideoEncoder * encoder)
goto beach;
}
/* FIXME Check if buffer isn't the last one here */
GST_LOG_OBJECT (encoder, "Process output buffer");
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL
(self->v4l2capture->pool), &buffer);
(self->v4l2capture->pool), &buffer, NULL);
if (ret != GST_FLOW_OK)
goto beach;
frame = gst_v4l2_video_enc_get_oldest_frame (encoder);
if (GST_BUFFER_TIMESTAMP (buffer) % GST_SECOND != 0)
GST_ERROR_OBJECT (encoder,
"Driver bug detected - check driver with v4l2-compliance from http://git.linuxtv.org/v4l-utils.git");
GST_LOG_OBJECT (encoder, "Got buffer for frame number %u",
(guint32) (GST_BUFFER_PTS (buffer) / GST_SECOND));
frame =
gst_video_encoder_get_frame (encoder,
GST_BUFFER_TIMESTAMP (buffer) / GST_SECOND);
if (frame) {
/* At this point, the delta unit buffer flag is already correctly set by
@ -781,9 +756,12 @@ gst_v4l2_video_enc_handle_frame (GstVideoEncoder * encoder,
if (frame->input_buffer) {
GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
GST_LOG_OBJECT (encoder, "Passing buffer with frame number %u",
frame->system_frame_number);
ret =
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL
(self->v4l2output->pool), &frame->input_buffer);
gst_v4l2_buffer_pool_process (GST_V4L2_BUFFER_POOL (self->
v4l2output->pool), &frame->input_buffer,
&frame->system_frame_number);
GST_VIDEO_ENCODER_STREAM_LOCK (encoder);
if (ret == GST_FLOW_FLUSHING) {