From 470f23b873679b045908551302fec6b1edf05a5a Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ahmet=20=C4=B0nan?= Date: Thu, 28 Feb 2008 12:46:32 +0100 Subject: [PATCH] [ALSA] snd-dummy - better realtime app support MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Ä°nan mathematik.uni-freiburg.de> Signed-off-by: Takashi Iwai --- sound/drivers/dummy.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/sound/drivers/dummy.c b/sound/drivers/dummy.c index f67f65829f..83ac4980c5 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 = -- 2.39.5