Linux: Fix horrible latency when the alsa pulseaudio plugin is involved, see issue #2651
The fix is asking alsa for a prefered "hardware" buffer size, so alsa does not fall back to pulseaudios offering of ~1 minute. Additionally, alsa busy waits when pulseaudio is used, sw:avail_min is set and hw:buffer_size is small. git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5439 8ced0084-cf51-0410-be5f-012b33b47a6e
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@ -88,6 +88,8 @@ bool AlsaSound::AlsaInit()
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int dir;
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snd_pcm_sw_params_t *swparams;
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snd_pcm_hw_params_t *hwparams;
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snd_pcm_uframes_t buffer_size;
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unsigned int periods;
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err = snd_pcm_open(&handle, "default", SND_PCM_STREAM_PLAYBACK, 0);
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if (err < 0)
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@ -133,6 +135,31 @@ bool AlsaSound::AlsaInit()
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return false;
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}
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periods = 2;
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err = snd_pcm_hw_params_set_periods_min(handle, hwparams, &periods, &dir);
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if (err < 0)
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{
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ERROR_LOG(AUDIO, "Cannot set Minimum periods: %s\n", snd_strerror(err));
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return false;
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}
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buffer_size = BUFFER_SIZE;
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err = snd_pcm_hw_params_set_buffer_size_min(handle, hwparams, &buffer_size);
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if (err < 0)
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{
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ERROR_LOG(AUDIO, "Cannot set minimum buffer size: %s\n", snd_strerror(err));
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return false;
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}
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buffer_size = BUFFER_SIZE*2;
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err = snd_pcm_hw_params_set_buffer_size_near(handle, hwparams, &buffer_size);
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if (err < 0)
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{
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ERROR_LOG(AUDIO, "Cannot set buffer size: %s\n", snd_strerror(err));
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return false;
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}
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NOTICE_LOG(AUDIO, "ALSA gave us %d \"hardware\" buffers of %d samples.\n", periods, buffer_size);
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err = snd_pcm_hw_params(handle, hwparams);
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if (err < 0)
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{
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@ -149,13 +176,6 @@ bool AlsaSound::AlsaInit()
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return false;
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}
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err = snd_pcm_sw_params_set_avail_min(handle, swparams, BUFFER_SIZE);
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if (err < 0)
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{
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ERROR_LOG(AUDIO, "cannot set avail min: %s\n", snd_strerror(err));
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return false;
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}
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err = snd_pcm_sw_params_set_start_threshold(handle, swparams, 0U);
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if (err < 0)
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{
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