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-rw-r--r--src/pcm_mix.c96
1 files changed, 69 insertions, 27 deletions
diff --git a/src/pcm_mix.c b/src/pcm_mix.c
index 3145c07be..6c6d1b4ab 100644
--- a/src/pcm_mix.c
+++ b/src/pcm_mix.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2003-2010 The Music Player Daemon Project
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
@@ -22,7 +22,6 @@
#include "pcm_volume.h"
#include "pcm_utils.h"
#include "audio_format.h"
-#include "mpd_error.h"
#include <glib.h>
@@ -100,35 +99,60 @@ pcm_add_vol_32(int32_t *buffer1, const int32_t *buffer2,
}
static void
+pcm_add_vol_float(float *buffer1, const float *buffer2,
+ unsigned num_samples, float volume1, float volume2)
+{
+ while (num_samples > 0) {
+ float sample1 = *buffer1;
+ float sample2 = *buffer2++;
+
+ sample1 = (sample1 * volume1 + sample2 * volume2);
+ *buffer1++ = sample1;
+ --num_samples;
+ }
+}
+
+static bool
pcm_add_vol(void *buffer1, const void *buffer2, size_t size,
int vol1, int vol2,
- const struct audio_format *format)
+ enum sample_format format)
{
- switch (format->format) {
+ switch (format) {
+ case SAMPLE_FORMAT_UNDEFINED:
+ case SAMPLE_FORMAT_DSD:
+ /* not implemented */
+ return false;
+
case SAMPLE_FORMAT_S8:
pcm_add_vol_8((int8_t *)buffer1, (const int8_t *)buffer2,
size, vol1, vol2);
- break;
+ return true;
case SAMPLE_FORMAT_S16:
pcm_add_vol_16((int16_t *)buffer1, (const int16_t *)buffer2,
size / 2, vol1, vol2);
- break;
+ return true;
case SAMPLE_FORMAT_S24_P32:
pcm_add_vol_24((int32_t *)buffer1, (const int32_t *)buffer2,
size / 4, vol1, vol2);
- break;
+ return true;
case SAMPLE_FORMAT_S32:
pcm_add_vol_32((int32_t *)buffer1, (const int32_t *)buffer2,
size / 4, vol1, vol2);
- break;
+ return true;
- default:
- MPD_ERROR("format %s not supported by pcm_add_vol",
- sample_format_to_string(format->format));
+ case SAMPLE_FORMAT_FLOAT:
+ pcm_add_vol_float(buffer1, buffer2, size / 4,
+ pcm_volume_to_float(vol1),
+ pcm_volume_to_float(vol2));
+ return true;
}
+
+ /* unreachable */
+ assert(false);
+ return false;
}
static void
@@ -188,45 +212,63 @@ pcm_add_32(int32_t *buffer1, const int32_t *buffer2, unsigned num_samples)
}
static void
+pcm_add_float(float *buffer1, const float *buffer2, unsigned num_samples)
+{
+ while (num_samples > 0) {
+ float sample1 = *buffer1;
+ float sample2 = *buffer2++;
+ *buffer1++ = sample1 + sample2;
+ --num_samples;
+ }
+}
+
+static bool
pcm_add(void *buffer1, const void *buffer2, size_t size,
- const struct audio_format *format)
+ enum sample_format format)
{
- switch (format->format) {
+ switch (format) {
+ case SAMPLE_FORMAT_UNDEFINED:
+ case SAMPLE_FORMAT_DSD:
+ /* not implemented */
+ return false;
+
case SAMPLE_FORMAT_S8:
pcm_add_8((int8_t *)buffer1, (const int8_t *)buffer2, size);
- break;
+ return true;
case SAMPLE_FORMAT_S16:
pcm_add_16((int16_t *)buffer1, (const int16_t *)buffer2, size / 2);
- break;
+ return true;
case SAMPLE_FORMAT_S24_P32:
pcm_add_24((int32_t *)buffer1, (const int32_t *)buffer2, size / 4);
- break;
+ return true;
case SAMPLE_FORMAT_S32:
pcm_add_32((int32_t *)buffer1, (const int32_t *)buffer2, size / 4);
- break;
+ return true;
- default:
- MPD_ERROR("format %s not supported by pcm_add",
- sample_format_to_string(format->format));
+ case SAMPLE_FORMAT_FLOAT:
+ pcm_add_float(buffer1, buffer2, size / 4);
+ return true;
}
+
+ /* unreachable */
+ assert(false);
+ return false;
}
-void
+bool
pcm_mix(void *buffer1, const void *buffer2, size_t size,
- const struct audio_format *format, float portion1)
+ enum sample_format format, float portion1)
{
int vol1;
float s;
/* portion1 is between 0.0 and 1.0 for crossfading, MixRamp uses NaN
* to signal mixing rather than fading */
- if (isnan(portion1)) {
- pcm_add(buffer1, buffer2, size, format);
- return;
- }
+ if (isnan(portion1))
+ return pcm_add(buffer1, buffer2, size, format);
s = sin(M_PI_2 * portion1);
s *= s;
@@ -234,5 +276,5 @@ pcm_mix(void *buffer1, const void *buffer2, size_t size,
vol1 = s * PCM_VOLUME_1 + 0.5;
vol1 = vol1 > PCM_VOLUME_1 ? PCM_VOLUME_1 : (vol1 < 0 ? 0 : vol1);
- pcm_add_vol(buffer1, buffer2, size, vol1, PCM_VOLUME_1 - vol1, format);
+ return pcm_add_vol(buffer1, buffer2, size, vol1, PCM_VOLUME_1 - vol1, format);
}