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-rw-r--r--NEWS2
-rw-r--r--src/pcm_mix.c23
2 files changed, 24 insertions, 1 deletions
diff --git a/NEWS b/NEWS
index 2afda2f99..60a19799a 100644
--- a/NEWS
+++ b/NEWS
@@ -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
diff --git a/src/pcm_mix.c b/src/pcm_mix.c
index 34b4b9175..6e678a912 100644
--- a/src/pcm_mix.c
+++ b/src/pcm_mix.c
@@ -82,6 +82,23 @@ 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,
const struct audio_format *format)
@@ -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);
}