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[ALSA] Improve playback startup. Increase buffer size, and reduce xruns. 

EMU10K1/EMU10K2 driver


Signed-off-by: James Courtier-Dutton <James@superbug.co.uk>
This commit is contained in:
James Courtier-Dutton 2005-04-10 00:00:24 +02:00 committed by Jaroslav Kysela
parent 001f758990
commit 310bacd292
1 changed files with 5 additions and 4 deletions
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9
sound/pci/emu10k1/p16v.c
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@ -124,9 +124,9 @@ static snd_pcm_hardware_t snd_p16v_playback_hw = {
.rate_max = 192000,
.channels_min = 8,
.channels_max = 8,
.buffer_bytes_max = (32*1024),
.buffer_bytes_max = ((65536 - 64) * 8),
.period_bytes_min = 64,
.period_bytes_max = (16*1024),
.period_bytes_max = (65536 - 64),
.periods_min = 2,
.periods_max = 8,
.fifo_size = 0,
@ -347,7 +347,8 @@ static int snd_p16v_pcm_prepare_playback(snd_pcm_substream_t *substream)
snd_emu10k1_ptr20_write(emu, PLAYBACK_LIST_SIZE, channel, (runtime->periods - 1) << 19);
snd_emu10k1_ptr20_write(emu, PLAYBACK_LIST_PTR, channel, 0);
snd_emu10k1_ptr20_write(emu, PLAYBACK_DMA_ADDR, channel, runtime->dma_addr);
snd_emu10k1_ptr20_write(emu, PLAYBACK_PERIOD_SIZE, channel, frames_to_bytes(runtime, runtime->period_size)<<16); // buffer size in bytes
//snd_emu10k1_ptr20_write(emu, PLAYBACK_PERIOD_SIZE, channel, frames_to_bytes(runtime, runtime->period_size)<<16); // buffer size in bytes
snd_emu10k1_ptr20_write(emu, PLAYBACK_PERIOD_SIZE, channel, 0); // buffer size in bytes
snd_emu10k1_ptr20_write(emu, PLAYBACK_POINTER, channel, 0);
snd_emu10k1_ptr20_write(emu, 0x07, channel, 0x0);
snd_emu10k1_ptr20_write(emu, 0x08, channel, 0);
@ -602,7 +603,7 @@ int snd_p16v_pcm(emu10k1_t *emu, int device, snd_pcm_t **rpcm)
if ((err = snd_pcm_lib_preallocate_pages(substream,
SNDRV_DMA_TYPE_DEV,
snd_dma_pci_data(emu->pci),
64*1024, 64*1024)) < 0) /* FIXME: 32*1024 for sound buffer, between 32and64 for Periods table. */
((65536 - 64) * 8), ((65536 - 64) * 8))) < 0)
return err;
//snd_printk("preallocate playback substream: err=%d\n", err);
}