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opensles: initial attempt to reduce the src latency

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This commit is contained in:
Josep Torra 2012-10-01 10:59:08 +02:00 committed by Sebastian Dröge
parent 920354eb0d
commit fc087f6419
2 changed files with 12 additions and 16 deletions
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24
sys/opensles/openslesringbuffer.c
View file

@ -38,8 +38,6 @@ _do_init (GType type)
GST_BOILERPLATE_FULL (GstOpenSLESRingBuffer, gst_opensles_ringbuffer,
GstRingBuffer, GST_TYPE_RING_BUFFER, _do_init);
#define RECORDER_QUEUE_SIZE 2
/*
* Some generic helper functions
*/
@ -125,7 +123,7 @@ _opensles_recorder_acquire (GstRingBuffer * rb, GstRingBufferSpec * spec)
/* Configure audio sink */
SLDataLocator_AndroidSimpleBufferQueue loc_bq = {
SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, RECORDER_QUEUE_SIZE
SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE, 2
};
SLDataSink audioSink = { &loc_bq, &format };
@ -173,10 +171,6 @@ _opensles_recorder_acquire (GstRingBuffer * rb, GstRingBufferSpec * spec)
goto failed;
}
/* Define our ringbuffer in terms of number of buffers and buffer size. */
spec->segsize = (spec->rate * spec->bytes_per_sample) >> 2;
spec->segtotal = 16;
return TRUE;
failed:
@ -198,6 +192,11 @@ _opensles_recorder_cb (SLAndroidSimpleBufferQueueItf bufferQueue, void *context)
gint seg;
gint len;
/* Advance only when we are called by the callback function */
if (bufferQueue) {
gst_ring_buffer_advance (rb, 1);
}
/* Get a segment form the GStreamer ringbuffer to write in */
if (!gst_ring_buffer_prepare_read (rb, &seg, &ptr, &len)) {
GST_WARNING_OBJECT (rb, "No segment available");
@ -213,10 +212,6 @@ _opensles_recorder_cb (SLAndroidSimpleBufferQueueItf bufferQueue, void *context)
(guint32) result);
return;
}
/* FIXME: we advance here and behaviour might be racy with the reading
* thread */
gst_ring_buffer_advance (rb, 1);
}
static gboolean
@ -224,7 +219,6 @@ _opensles_recorder_start (GstRingBuffer * rb)
{
GstOpenSLESRingBuffer *thiz = GST_OPENSLES_RING_BUFFER_CAST (rb);
SLresult result;
gint i;
/* Register callback on the buffer queue */
if (!thiz->is_queue_callback_registered) {
@ -238,10 +232,8 @@ _opensles_recorder_start (GstRingBuffer * rb)
thiz->is_queue_callback_registered = TRUE;
}
/* Preroll the buffer queue by enqueing segments */
for (i = 0; i < RECORDER_QUEUE_SIZE; i++) {
_opensles_recorder_cb (NULL, rb);
}
/* Preroll one buffer */
_opensles_recorder_cb (NULL, rb);
/* Start recording */
result =

4
sys/opensles/openslessrc.c
View file

@ -104,4 +104,8 @@ gst_opensles_src_class_init (GstOpenSLESSrcClass * klass)
static void
gst_opensles_src_init (GstOpenSLESSrc * src, GstOpenSLESSrcClass * gclass)
{
/* Override some default values to fit on the AudioFlinger behaviour of
* processing 20ms buffers as minimum buffer size. */
GST_BASE_AUDIO_SRC (src)->buffer_time = 400000;
GST_BASE_AUDIO_SRC (src)->latency_time = 20000;
}