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[ALSA] pcm core: fix silence_start calculations 

The case where silence_size < boundary was broken because different
parts of the snd_pcm_playback_silence() function disagreed about whether
silence_start should point to the start or to the end of the buffer part
to be silenced.
This patch changes the code to always use to the start, which also
simplifies several calculations.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Clemens Ladisch 2006-10-23 16:26:57 +02:00 committed by Jaroslav Kysela
parent 3bc8952959
commit 9a826ddba6
1 changed files with 3 additions and 5 deletions
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8
sound/core/pcm_lib.c
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@ -79,19 +79,17 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram
runtime->silence_filled -= frames;
if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
runtime->silence_filled = 0;
runtime->silence_start = (ofs + frames) - runtime->buffer_size;
runtime->silence_start = new_hw_ptr;
} else {
runtime->silence_start = ofs - runtime->silence_filled;
runtime->silence_start = ofs;
}
if ((snd_pcm_sframes_t)runtime->silence_start < 0)
runtime->silence_start += runtime->boundary;
}
frames = runtime->buffer_size - runtime->silence_filled;
}
snd_assert(frames <= runtime->buffer_size, return);
if (frames == 0)
return;
ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size;
ofs = runtime->silence_start % runtime->buffer_size;
while (frames > 0) {
transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||