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| author | Ahmet İnan <ainan at> | 2008-02-21 07:55:30 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2008-04-24 12:00:14 +0200 |
| commit | 53463a8302d0c3148c4c64c034312215e76429c2 (patch) | |
| tree | 0d83a19ffbb7d340744d7f3f98f3f35971ae279f /sound/drivers/dummy.c | |
| parent | 03d7ca177fd2ecac8eb22f482f327ecaae4ac8cb (diff) | |
| download | linux-53463a8302d0c3148c4c64c034312215e76429c2.tar.gz linux-53463a8302d0c3148c4c64c034312215e76429c2.tar.bz2 linux-53463a8302d0c3148c4c64c034312215e76429c2.zip | |
[ALSA] snd-dummy - improved timing, silence on prepare
Signed-off-by: Ahmet İnan <ainan <at> mathematik.uni-freiburg.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/drivers/dummy.c')
| -rw-r--r-- | sound/drivers/dummy.c | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c index a240eaeb5c62..f67f65829f3e 100644 --- a/sound/drivers/dummy.c +++ b/sound/drivers/dummy.c @@ -181,10 +181,10 @@ struct snd_dummy_pcm { struct snd_dummy *dummy; spinlock_t lock; struct timer_list timer; - unsigned int pcm_size; - unsigned int pcm_count; + unsigned int pcm_buffer_size; + unsigned int pcm_period_size; unsigned int pcm_bps; /* bytes per second */ - unsigned int pcm_jiffie; /* bytes per one jiffie */ + unsigned int pcm_hz; /* HZ */ unsigned int pcm_irq_pos; /* IRQ position */ unsigned int pcm_buf_pos; /* position in buffer */ struct snd_pcm_substream *substream; @@ -238,11 +238,15 @@ static int snd_card_dummy_pcm_prepare(struct snd_pcm_substream *substream) if (bps <= 0) return -EINVAL; dpcm->pcm_bps = bps; - dpcm->pcm_jiffie = bps / HZ; - dpcm->pcm_size = snd_pcm_lib_buffer_bytes(substream); - dpcm->pcm_count = snd_pcm_lib_period_bytes(substream); + dpcm->pcm_hz = HZ; + dpcm->pcm_buffer_size = snd_pcm_lib_buffer_bytes(substream); + dpcm->pcm_period_size = snd_pcm_lib_period_bytes(substream); dpcm->pcm_irq_pos = 0; dpcm->pcm_buf_pos = 0; + + snd_pcm_format_set_silence(runtime->format, runtime->dma_area, + bytes_to_samples(runtime, runtime->dma_bytes)); + return 0; } @@ -254,11 +258,11 @@ static void snd_card_dummy_pcm_timer_function(unsigned long data) spin_lock_irqsave(&dpcm->lock, flags); dpcm->timer.expires = 1 + jiffies; add_timer(&dpcm->timer); - dpcm->pcm_irq_pos += dpcm->pcm_jiffie; - dpcm->pcm_buf_pos += dpcm->pcm_jiffie; - dpcm->pcm_buf_pos %= dpcm->pcm_size; - if (dpcm->pcm_irq_pos >= dpcm->pcm_count) { - dpcm->pcm_irq_pos %= dpcm->pcm_count; + dpcm->pcm_irq_pos += dpcm->pcm_bps; + if (dpcm->pcm_irq_pos >= dpcm->pcm_period_size * dpcm->pcm_hz) { + dpcm->pcm_irq_pos %= dpcm->pcm_period_size * dpcm->pcm_hz; + dpcm->pcm_buf_pos += dpcm->pcm_period_size; + dpcm->pcm_buf_pos %= dpcm->pcm_buffer_size; spin_unlock_irqrestore(&dpcm->lock, flags); snd_pcm_period_elapsed(dpcm->substream); } else |