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gst: handle blocking in the _render() function

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When we do any other blocking in the render function, we should unblock
and call _wait_preroll() when we go to PAUSED.

We can have this situation when all the buffers are queued in the
pw_stream and we get a new _render() call. We can't get more buffers
from the pool and so we must block and wait.  When we go to PAUSED we
need to unlock and go to _wait_preroll(). Implement this by setting a
pool paused flag that is set when the sink goes to paused, we can then
return a special value that does the wait_preroll().

See !2248
This commit is contained in:
Wim Taymans 2025-01-17 16:33:15 +01:00
parent 85c5d65c97
commit c7ccc5abca
3 changed files with 34 additions and 3 deletions
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18
src/gst/gstpipewirepool.c
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@ -171,6 +171,9 @@ acquire_buffer (GstBufferPool * pool, GstBuffer ** buffer,
if (params && (params->flags & GST_BUFFER_POOL_ACQUIRE_FLAG_DONTWAIT))
goto no_more_buffers;
if (p->paused)
goto paused;
GST_WARNING_OBJECT (pool, "failed to dequeue buffer: %s", strerror(errno));
g_cond_wait (&p->cond, GST_OBJECT_GET_LOCK (pool));
}
@ -190,6 +193,11 @@ flushing:
GST_OBJECT_UNLOCK (pool);
return GST_FLOW_FLUSHING;
}
paused:
{
GST_OBJECT_UNLOCK (pool);
return GST_FLOW_CUSTOM_ERROR_1;
}
no_more_buffers:
{
GST_LOG_OBJECT (pool, "no more buffers");
@ -244,6 +252,16 @@ set_config (GstBufferPool * pool, GstStructure * config)
return GST_BUFFER_POOL_CLASS (gst_pipewire_pool_parent_class)->set_config (pool, config);
}
void gst_pipewire_pool_set_paused (GstPipeWirePool *pool, gboolean paused)
{
GST_DEBUG ("flush start");
GST_OBJECT_LOCK (pool);
pool->paused = paused;
g_cond_signal (&pool->cond);
GST_OBJECT_UNLOCK (pool);
}
static void
flush_start (GstBufferPool * pool)
{