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pulsesrc: Fix mapping of latency parameters to buffer attributes

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This commit is contained in:
Arun Raghavan 2015-04-07 14:06:16 +05:30
parent 0c46c5c3e2
commit 8e236fa2e1
1 changed files with 19 additions and 3 deletions
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22
ext/pulse/pulsesrc.c
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@ -1501,7 +1501,20 @@ gst_pulsesrc_prepare (GstAudioSrc * asrc, GstAudioRingBufferSpec * spec)
pa_operation_unref (o);
wanted.maxlength = -1;
/* There's a bit of a disconnect here between the audio ringbuffer and what
* PulseAudio provides. The audio ringbuffer provide a total of buffer_time
* worth of buffering, divided into segments of latency_time size. We're
* asking PulseAudio to provide a total latency of latency_time, which, with
* PA_STREAM_ADJUST_LATENCY, effectively sets itself up as a ringbuffer with
* one segment being the hardware buffer, and the other the software buffer.
* This segment size is returned as the fragsize.
*
* Since the two concepts don't map very well, what we do is keep segsize as
* it is (unless fragsize is even larger, in which case we use that). We'll
* get data from PulseAudio in smaller chunks than we want to pass on as an
* element, and we coalesce those chunks in the ringbuffer memory and pass it
* on in the expected chunk size. */
wanted.maxlength = spec->segsize * spec->segtotal;
wanted.tlength = -1;
wanted.prebuf = 0;
wanted.minreq = -1;
@ -1574,11 +1587,14 @@ gst_pulsesrc_prepare (GstAudioSrc * asrc, GstAudioRingBufferSpec * spec)
GST_INFO_OBJECT (pulsesrc, "fragsize: %d (wanted %d)",
actual->fragsize, wanted.fragsize);
if (actual->fragsize >= wanted.fragsize) {
if (actual->fragsize >= spec->segsize) {
spec->segsize = actual->fragsize;
} else {
spec->segsize = actual->fragsize * (wanted.fragsize / actual->fragsize);
/* fragsize is smaller than what we wanted, so let the read function
* coalesce the smaller chunks as they come in */
}
/* Fix up the total ringbuffer size based on what we actually got */
spec->segtotal = actual->maxlength / spec->segsize;
if (!pulsesrc->paused) {