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v4l2: Split flush in start/stop_streaming

Browse source 
This allow calling start streaming later for capture device. Currently it breaks
in dmabuf-import because downstream is holding a buffer that will only be
released after stream-start.

https://bugzilla.gnome.org/show_bug.cgi?id=730207
This commit is contained in:
Nicolas Dufresne 2014-05-14 17:18:35 -04:00
parent c1792de95e
commit a4b5811d22
4 changed files with 62 additions and 26 deletions
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29
sys/v4l2/gstv4l2bufferpool.c
View file

@ -1690,29 +1690,38 @@ start_failed:
/**
* gst_v4l2_buffer_pool_flush:
* gst_v4l2_buffer_pool_stop_streaming:
* @bpool: a #GstBufferPool
*
* First, set obj->poll to be flushing
* Call STREAMOFF to clear QUEUED flag on every driver buffers.
* Then release all buffers that are in pool->buffers array.
* Finally call STREAMON if CAPTURE type
* The caller is responsible to unset flushing on obj->pool
*
* Returns: TRUE on success.
*/
gboolean
gst_v4l2_buffer_pool_flush (GstV4l2BufferPool * pool)
gst_v4l2_buffer_pool_stop_streaming (GstV4l2BufferPool * pool)
{
GstV4l2Object *obj = pool->obj;
GST_DEBUG_OBJECT (pool, "stop streaming");
GST_DEBUG_OBJECT (pool, "flush");
if (!stop_streaming (pool))
goto stop_failed;
stop_streaming (pool);
return TRUE;
/* ERRORS */
stop_failed:
{
GST_ERROR_OBJECT (pool, "failed to stop streaming");
return FALSE;
}
}
gboolean
gst_v4l2_buffer_pool_start_streaming (GstV4l2BufferPool * pool)
{
GST_DEBUG_OBJECT (pool, "start straming");
/* we can start capturing now, we wait for the playback
* case until we queued the first buffer */
if (!V4L2_TYPE_IS_OUTPUT (obj->type))
if (!start_streaming (pool))
goto start_failed;

3
sys/v4l2/gstv4l2bufferpool.h
View file

@ -84,7 +84,8 @@ GstBufferPool * gst_v4l2_buffer_pool_new (GstV4l2Object *obj, GstCaps *c
GstFlowReturn gst_v4l2_buffer_pool_process (GstV4l2BufferPool * bpool, GstBuffer ** buf);
gboolean gst_v4l2_buffer_pool_flush (GstV4l2BufferPool * pool);
gboolean gst_v4l2_buffer_pool_stop_streaming (GstV4l2BufferPool * pool);
gboolean gst_v4l2_buffer_pool_start_streaming (GstV4l2BufferPool * pool);
void gst_v4l2_buffer_pool_set_other_pool (GstV4l2BufferPool * pool,
GstBufferPool * other_pool);

40
sys/v4l2/gstv4l2transform.c
View file

@ -530,6 +530,11 @@ static gboolean
gst_v4l2_transform_sink_event (GstBaseTransform * trans, GstEvent * event)
{
GstV4l2Transform *self = GST_V4L2_TRANSFORM (trans);
gboolean ret;
/* Nothing to flush in passthrough */
if (gst_base_transform_is_passthrough (trans))
return GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
@ -539,19 +544,38 @@ gst_v4l2_transform_sink_event (GstBaseTransform * trans, GstEvent * event)
break;
case GST_EVENT_FLUSH_STOP:
GST_DEBUG_OBJECT (self, "flush stop");
if (self->v4l2output->pool)
gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2output->
pool));
if (self->v4l2capture->pool)
gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2capture->
pool));
if (self->v4l2output->pool) {
gst_v4l2_buffer_pool_stop_streaming (GST_V4L2_BUFFER_POOL
(self->v4l2output->pool));
gst_v4l2_buffer_pool_start_streaming (GST_V4L2_BUFFER_POOL
(self->v4l2capture->pool));
gst_v4l2_object_unlock_stop (self->v4l2output);
gst_v4l2_object_unlock_stop (self->v4l2capture);
}
if (self->v4l2capture->pool)
gst_v4l2_buffer_pool_stop_streaming (GST_V4L2_BUFFER_POOL
(self->v4l2capture->pool));
default:
break;
}
return GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
ret = GST_BASE_TRANSFORM_CLASS (parent_class)->sink_event (trans, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
/* Buffer should be back now */
if (self->v4l2capture->pool) {
gst_v4l2_buffer_pool_start_streaming (GST_V4L2_BUFFER_POOL
(self->v4l2capture->pool));
gst_v4l2_object_unlock_stop (self->v4l2capture);
}
GST_DEBUG_OBJECT (self, "flush stop done");
break;
default:
break;
}
return ret;
}
static GstStateChangeReturn

12
sys/v4l2/gstv4l2videodec.c
View file

@ -277,13 +277,12 @@ gst_v4l2_video_dec_flush (GstVideoDecoder * decoder)
self->output_flow = GST_FLOW_OK;
if (self->v4l2output->pool)
gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2output->pool));
gst_v4l2_buffer_pool_stop_streaming (GST_V4L2_BUFFER_POOL
(self->v4l2output->pool));
if (self->v4l2capture->pool)
gst_v4l2_buffer_pool_flush (GST_V4L2_BUFFER_POOL (self->v4l2capture->pool));
/* Output will remain flushing until new frame comes in */
gst_v4l2_object_unlock_stop (self->v4l2capture);
gst_v4l2_buffer_pool_stop_streaming (GST_V4L2_BUFFER_POOL
(self->v4l2capture->pool));
return TRUE;
}
@ -525,7 +524,10 @@ gst_v4l2_video_dec_handle_frame (GstVideoDecoder * decoder,
GST_DEBUG_OBJECT (self, "Starting decoding thread");
/* Enable processing input */
gst_v4l2_buffer_pool_start_streaming (GST_V4L2_BUFFER_POOL
(self->v4l2capture->pool));
gst_v4l2_object_unlock_stop (self->v4l2output);
gst_v4l2_object_unlock_stop (self->v4l2capture);
/* Start the processing task, when it quits, the task will disable input
* processing to unlock input if draining, or prevent potential block */