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Fix wrong offset calculation in snd_pcm_{read|write}_mmap()

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The offset used in snd_pcm_{read|write}_mmap() is not the linear offset
but the offset in a ring buffer.  It has to be rounded.
This commit is contained in:
Takashi Iwai 2007-09-20 13:20:03 +02:00
parent cda4a3cb61
commit 67399e35ff
1 changed files with 2 additions and 2 deletions
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4
src/pcm/pcm_mmap.c
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@ -575,7 +575,7 @@ snd_pcm_sframes_t snd_pcm_write_mmap(snd_pcm_t *pcm, snd_pcm_uframes_t offset,
if (err < 0) if (err < 0)
break; break;
xfer += frames; xfer += frames;
offset += frames; offset = (offset + frames) % pcm->buffer_size;
} }
if (xfer > 0) if (xfer > 0)
return xfer; return xfer;
@ -625,7 +625,7 @@ snd_pcm_sframes_t snd_pcm_read_mmap(snd_pcm_t *pcm, snd_pcm_uframes_t offset,
if (err < 0) if (err < 0)
break; break;
xfer += frames; xfer += frames;
offset += frames; offset = (offset + frames) % pcm->buffer_size;
} }
if (xfer > 0) if (xfer > 0)
return xfer; return xfer;