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pcm_mix: implemented 32 bit support

This commit is contained in:
Max Kellermann 2009-11-19 21:00:54 +01:00
parent 1358428031
commit 300f936228
2 changed files with 24 additions and 1 deletions
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2
NEWS
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@ -71,7 +71,7 @@ ver 0.16 (20??/??/??)
* database: eliminated maximum line length
* log: redirect stdout/stderr to /dev/null if syslog is used
* set the close-on-exec flag on all file descriptors
* pcm_volume: implemented 32 bit support
* pcm_volume, pcm_mix: implemented 32 bit support
* obey $(sysconfdir) for default mpd.conf location
* build with large file support by default
* require GLib 2.12

23
src/pcm_mix.c
View File

@ -81,6 +81,23 @@ pcm_add_24(int32_t *buffer1, const int32_t *buffer2,
}
}
static void
pcm_add_32(int32_t *buffer1, const int32_t *buffer2,
unsigned num_samples, unsigned volume1, unsigned volume2)
{
while (num_samples > 0) {
int64_t sample1 = *buffer1;
int64_t sample2 = *buffer2++;
sample1 = ((sample1 * volume1 + sample2 * volume2) +
pcm_volume_dither() + PCM_VOLUME_1 / 2)
/ PCM_VOLUME_1;
*buffer1++ = pcm_range_64(sample1, 32);
--num_samples;
}
}
static void
pcm_add(void *buffer1, const void *buffer2, size_t size,
int vol1, int vol2,
@ -103,6 +120,12 @@ pcm_add(void *buffer1, const void *buffer2, size_t size,
size / 4, vol1, vol2);
break;
case 32:
pcm_add_32((int32_t*)buffer1,
(const int32_t*)buffer2,
size / 4, vol1, vol2);
break;
default:
g_error("%u bits not supported by pcm_add!\n", format->bits);
}