diff options
Diffstat (limited to 'src/pcm_mix.c')
| -rw-r--r-- | src/pcm_mix.c | 35 |
1 files changed, 30 insertions, 5 deletions
diff --git a/src/pcm_mix.c b/src/pcm_mix.c index d1e716731..f5a8eb90e 100644 --- a/src/pcm_mix.c +++ b/src/pcm_mix.c @@ -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)); } } |