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output/alsa: remove the obsolete Raspberry Pi workaround

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Has been superseded by the previous commit.
This commit is contained in:
Max Kellermann 2014-03-02 11:11:40 +01:00
parent a884e37de1
commit 47ea69233b
1 changed files with 0 additions and 36 deletions
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36
src/output/AlsaOutputPlugin.cxx
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@ -105,14 +105,6 @@ struct AlsaOutput {
*/
snd_pcm_uframes_t period_position;
/**
* Set to non-zero when the Raspberry Pi workaround has been
* activated in alsa_recover(); decremented by each write.
* This will avoid activating it again, leading to an endless
* loop. This problem was observed with a "RME Digi9636/52".
*/
unsigned pi_workaround;
/**
* Do we need to call snd_pcm_prepare() before the next write?
* It means that we put the device to SND_PCM_STATE_SETUP by
@ -688,8 +680,6 @@ alsa_open(struct audio_output *ao, AudioFormat &audio_format, Error &error)
{
AlsaOutput *ad = (AlsaOutput *)ao;
ad->pi_workaround = 0;
int err = snd_pcm_open(&ad->pcm, alsa_device(ad),
SND_PCM_STREAM_PLAYBACK, ad->mode);
if (err < 0) {
@ -750,29 +740,6 @@ alsa_recover(AlsaOutput *ad, int err)
case SND_PCM_STATE_XRUN:
ad->period_position = 0;
err = snd_pcm_prepare(ad->pcm);
if (err == 0 && ad->pi_workaround == 0) {
/* this works around a driver bug observed on
the Raspberry Pi: after snd_pcm_drop(), the
whole ring buffer must be invalidated, but
the snd_pcm_prepare() call above makes the
driver play random data that just happens
to be still in the buffer; by adding and
cancelling some silence, this bug does not
occur */
alsa_write_silence(ad, ad->period_frames);
/* cancel the silence data right away to avoid
increasing latency; even though this
function call invalidates the portion of
silence, the driver seems to avoid the
bug */
snd_pcm_reset(ad->pcm);
/* disable the workaround for some time */
ad->pi_workaround = 8;
}
break;
case SND_PCM_STATE_DISCONNECTED:
break;
@ -859,9 +826,6 @@ alsa_play(struct audio_output *ao, const void *chunk, size_t size,
ad->period_position = (ad->period_position + ret)
% ad->period_frames;
if (ad->pi_workaround > 0)
--ad->pi_workaround;
size_t bytes_written = ret * ad->out_frame_size;
return ad->pcm_export->CalcSourceSize(bytes_written);
}