[ALSA] Improve playback startup. Increase buffer size, and reduce xruns. (310bacd2) · Commits · 戴 / test

sound/pci/emu10k1/p16v.c

+5 −4

Original line number	Diff line number	Diff line
		@@ -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),
		641024, 641024)) < 0) /* FIXME: 321024 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);
		}

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