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-rw-r--r--src/pcm_mix.c37
1 files changed, 31 insertions, 6 deletions
diff --git a/src/pcm_mix.c b/src/pcm_mix.c
index d1e716731..9a8aaeaca 100644
--- a/src/pcm_mix.c
+++ b/src/pcm_mix.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * Copyright (C) 2003-2010 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
@@ -17,6 +17,7 @@
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
+#include "config.h"
#include "pcm_mix.h"
#include "pcm_volume.h"
#include "pcm_utils.h"
@@ -81,29 +82,53 @@ 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)
{
- switch (format->bits) {
- case 8:
+ switch (format->format) {
+ case SAMPLE_FORMAT_S8:
pcm_add_8((int8_t *)buffer1, (const int8_t *)buffer2,
size, vol1, vol2);
break;
- case 16:
+ case SAMPLE_FORMAT_S16:
pcm_add_16((int16_t *)buffer1, (const int16_t *)buffer2,
size / 2, vol1, vol2);
break;
- case 24:
+ case SAMPLE_FORMAT_S24_P32:
pcm_add_24((int32_t*)buffer1,
(const int32_t*)buffer2,
size / 4, vol1, vol2);
break;
+ case SAMPLE_FORMAT_S32:
+ 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);
+ g_error("format %s not supported by pcm_add",
+ sample_format_to_string(format->format));
}
}