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| author | Max Kellermann <max@duempel.org> | 2011-10-20 02:36:26 +0200 |
|---|---|---|
| committer | Max Kellermann <max@duempel.org> | 2011-10-20 02:36:26 +0200 |
| commit | e71a652985768e5f4ad78f23786dff08081214db (patch) | |
| tree | c54111e0adf6aa308930035e0c393ce83942fc97 /src | |
| parent | bfef0fbff34e80a86d7b740eace597efe52136e1 (diff) | |
| download | mpd-e71a652985768e5f4ad78f23786dff08081214db.tar.gz mpd-e71a652985768e5f4ad78f23786dff08081214db.tar.xz mpd-e71a652985768e5f4ad78f23786dff08081214db.zip | |
pcm_mix: implement float samples
Diffstat (limited to 'src')
| -rw-r--r-- | src/pcm_mix.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/src/pcm_mix.c b/src/pcm_mix.c index b94089cfb..9f76d568f 100644 --- a/src/pcm_mix.c +++ b/src/pcm_mix.c @@ -98,6 +98,20 @@ 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, @@ -130,8 +144,10 @@ pcm_add_vol(void *buffer1, const void *buffer2, size_t size, return true; case SAMPLE_FORMAT_FLOAT: - /* XXX */ - return false; + pcm_add_vol_float(buffer1, buffer2, size / 4, + pcm_volume_to_float(vol1), + pcm_volume_to_float(vol2)); + return true; } /* unreachable */ @@ -195,6 +211,17 @@ 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, enum sample_format format) @@ -222,8 +249,8 @@ pcm_add(void *buffer1, const void *buffer2, size_t size, return true; case SAMPLE_FORMAT_FLOAT: - /* XXX */ - return false; + pcm_add_float(buffer1, buffer2, size / 4); + return true; } /* unreachable */ |