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winealsa: Use an ALSA buffer of 4 periods to limit prefill.

This commit is contained in:
Jörg Höhle 2011-11-11 06:33:24 +04:00 committed by Alexandre Julliard
parent 821358d05e
commit 6d17715b01
1 changed files with 19 additions and 3 deletions
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22
dlls/winealsa.drv/mmdevdrv.c
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@ -945,6 +945,24 @@ static HRESULT WINAPI AudioClient_Initialize(IAudioClient *iface,
This->hw_params, &alsa_period_us, NULL)) < 0)
WARN("Unable to set period time near %u: %d (%s)\n", alsa_period_us,
err, snd_strerror(err));
/* ALSA updates the output variable alsa_period_us */
This->mmdev_period_frames = MulDiv(fmt->nSamplesPerSec,
This->mmdev_period_rt, 10000000);
This->bufsize_frames = MulDiv(duration, fmt->nSamplesPerSec, 10000000);
/* Buffer 4 ALSA periods if large enough, else 4 mmdevapi periods */
This->alsa_bufsize_frames = This->mmdev_period_frames * 4;
if(err < 0 || alsa_period_us < period / 10)
err = snd_pcm_hw_params_set_buffer_size_near(This->pcm_handle,
This->hw_params, &This->alsa_bufsize_frames);
else{
unsigned int periods = 4;
err = snd_pcm_hw_params_set_periods_near(This->pcm_handle, This->hw_params, &periods, NULL);
}
if(err < 0)
WARN("Unable to set buffer size: %d (%s)\n", err, snd_strerror(err));
if((err = snd_pcm_hw_params(This->pcm_handle, This->hw_params)) < 0){
WARN("Unable to set hw params: %d (%s)\n", err, snd_strerror(err));
@ -1008,12 +1026,10 @@ static HRESULT WINAPI AudioClient_Initialize(IAudioClient *iface,
/* Check if the ALSA buffer is so small that it will run out before
* the next MMDevAPI period tick occurs. Allow a little wiggle room
* with 120% of the period time. */
This->mmdev_period_frames = (fmt->nSamplesPerSec * This->mmdev_period_rt) / 10000000.;
if(This->alsa_bufsize_frames < 1.2 * This->mmdev_period_frames)
FIXME("ALSA buffer time is smaller than our period time. Expect underruns. (%lu < %u)\n",
FIXME("ALSA buffer time is too small. Expect underruns. (%lu < %u * 1.2)\n",
This->alsa_bufsize_frames, This->mmdev_period_frames);
This->bufsize_frames = ceil((duration / 10000000.) * fmt->nSamplesPerSec);
This->local_buffer = HeapAlloc(GetProcessHeap(), 0,
This->bufsize_frames * fmt->nBlockAlign);
if(!This->local_buffer){