From: Ahmet İnan Date: Thu, 28 Feb 2008 11:46:32 +0000 (+0100) Subject: [ALSA] snd-dummy - better realtime app support X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=470f23b873679b045908551302fec6b1edf05a5a;p=linux-beck.git [ALSA] snd-dummy - better realtime app support when the time interval for a period is smaller than kernel HZ, then snd-aloop and snd-dummy cannot call snd_pcm_period_elapsed as fast enough annymore. this happens for example with games. but the app still needs to see, that the buffer actually did go further, which is provided by these patches. Signed-off-by: Ahmet İnan mathematik.uni-freiburg.de> Signed-off-by: Takashi Iwai --- diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c index f67f65829f3e..83ac4980c5fb 100644 --- a/sound/drivers/dummy.c +++ b/sound/drivers/dummy.c @@ -259,10 +259,10 @@ static void snd_card_dummy_pcm_timer_function(unsigned long data) dpcm->timer.expires = 1 + jiffies; add_timer(&dpcm->timer); dpcm->pcm_irq_pos += dpcm->pcm_bps; + dpcm->pcm_buf_pos += dpcm->pcm_bps; + dpcm->pcm_buf_pos %= dpcm->pcm_buffer_size * dpcm->pcm_hz; 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 @@ -274,7 +274,7 @@ static snd_pcm_uframes_t snd_card_dummy_pcm_pointer(struct snd_pcm_substream *su struct snd_pcm_runtime *runtime = substream->runtime; struct snd_dummy_pcm *dpcm = runtime->private_data; - return bytes_to_frames(runtime, dpcm->pcm_buf_pos); + return bytes_to_frames(runtime, dpcm->pcm_buf_pos / dpcm->pcm_hz); } static struct snd_pcm_hardware snd_card_dummy_playback =