diff options
Diffstat (limited to '')
| -rw-r--r-- | src/pcm_mix.c | 123 | ||||
| -rw-r--r-- | src/pcm_mix.h | 3 |
2 files changed, 104 insertions, 22 deletions
diff --git a/src/pcm_mix.c b/src/pcm_mix.c index 28129608b..33815dac2 100644 --- a/src/pcm_mix.c +++ b/src/pcm_mix.c @@ -31,8 +31,8 @@ #define G_LOG_DOMAIN "pcm" static void -pcm_add_8(int8_t *buffer1, const int8_t *buffer2, - unsigned num_samples, int volume1, int volume2) +pcm_add_vol_8(int8_t *buffer1, const int8_t *buffer2, + unsigned num_samples, int volume1, int volume2) { while (num_samples > 0) { int32_t sample1 = *buffer1; @@ -48,8 +48,8 @@ pcm_add_8(int8_t *buffer1, const int8_t *buffer2, } static void -pcm_add_16(int16_t *buffer1, const int16_t *buffer2, - unsigned num_samples, int volume1, int volume2) +pcm_add_vol_16(int16_t *buffer1, const int16_t *buffer2, + unsigned num_samples, int volume1, int volume2) { while (num_samples > 0) { int32_t sample1 = *buffer1; @@ -65,8 +65,8 @@ pcm_add_16(int16_t *buffer1, const int16_t *buffer2, } static void -pcm_add_24(int32_t *buffer1, const int32_t *buffer2, - unsigned num_samples, unsigned volume1, unsigned volume2) +pcm_add_vol_24(int32_t *buffer1, const int32_t *buffer2, + unsigned num_samples, unsigned volume1, unsigned volume2) { while (num_samples > 0) { int64_t sample1 = *buffer1; @@ -82,8 +82,8 @@ 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) +pcm_add_vol_32(int32_t *buffer1, const int32_t *buffer2, + unsigned num_samples, unsigned volume1, unsigned volume2) { while (num_samples > 0) { int64_t sample1 = *buffer1; @@ -99,31 +99,112 @@ pcm_add_32(int32_t *buffer1, const int32_t *buffer2, } static void +pcm_add_vol(void *buffer1, const void *buffer2, size_t size, + int vol1, int vol2, + const struct audio_format *format) +{ + switch (format->format) { + case SAMPLE_FORMAT_S8: + pcm_add_vol_8((int8_t *)buffer1, (const int8_t *)buffer2, + size, vol1, vol2); + break; + + case SAMPLE_FORMAT_S16: + pcm_add_vol_16((int16_t *)buffer1, (const int16_t *)buffer2, + size / 2, vol1, vol2); + break; + + case SAMPLE_FORMAT_S24_P32: + pcm_add_vol_24((int32_t *)buffer1, (const int32_t *)buffer2, + size / 4, vol1, vol2); + break; + + case SAMPLE_FORMAT_S32: + pcm_add_vol_32((int32_t *)buffer1, (const int32_t *)buffer2, + size / 4, vol1, vol2); + break; + + default: + g_error("format %s not supported by pcm_add_vol", + sample_format_to_string(format->format)); + } +} + +static void +pcm_add_8(int8_t *buffer1, const int8_t *buffer2, unsigned num_samples) +{ + while (num_samples > 0) { + int32_t sample1 = *buffer1; + int32_t sample2 = *buffer2++; + + sample1 += sample2; + + *buffer1++ = pcm_range(sample1, 8); + --num_samples; + } +} + +static void +pcm_add_16(int16_t *buffer1, const int16_t *buffer2, unsigned num_samples) +{ + while (num_samples > 0) { + int32_t sample1 = *buffer1; + int32_t sample2 = *buffer2++; + + sample1 += sample2; + + *buffer1++ = pcm_range(sample1, 16); + --num_samples; + } +} + +static void +pcm_add_24(int32_t *buffer1, const int32_t *buffer2, unsigned num_samples) +{ + while (num_samples > 0) { + int64_t sample1 = *buffer1; + int64_t sample2 = *buffer2++; + + sample1 += sample2; + + *buffer1++ = pcm_range(sample1, 24); + --num_samples; + } +} + +static void +pcm_add_32(int32_t *buffer1, const int32_t *buffer2, unsigned num_samples) +{ + while (num_samples > 0) { + int64_t sample1 = *buffer1; + int64_t sample2 = *buffer2++; + + sample1 += sample2; + + *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->format) { case SAMPLE_FORMAT_S8: - pcm_add_8((int8_t *)buffer1, (const int8_t *)buffer2, - size, vol1, vol2); + pcm_add_8((int8_t *)buffer1, (const int8_t *)buffer2, size); break; case SAMPLE_FORMAT_S16: - pcm_add_16((int16_t *)buffer1, (const int16_t *)buffer2, - size / 2, vol1, vol2); + pcm_add_16((int16_t *)buffer1, (const int16_t *)buffer2, size / 2); break; case SAMPLE_FORMAT_S24_P32: - pcm_add_24((int32_t*)buffer1, - (const int32_t*)buffer2, - size / 4, vol1, vol2); + pcm_add_24((int32_t *)buffer1, (const int32_t *)buffer2, size / 4); break; case SAMPLE_FORMAT_S32: - pcm_add_32((int32_t*)buffer1, - (const int32_t*)buffer2, - size / 4, vol1, vol2); + pcm_add_32((int32_t *)buffer1, (const int32_t *)buffer2, size / 4); break; default: @@ -142,7 +223,7 @@ pcm_mix(void *buffer1, const void *buffer2, size_t size, /* 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, PCM_VOLUME_1, PCM_VOLUME_1, format); + pcm_add(buffer1, buffer2, size, format); return; } @@ -152,5 +233,5 @@ 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(buffer1, buffer2, size, vol1, PCM_VOLUME_1 - vol1, format); + pcm_add_vol(buffer1, buffer2, size, vol1, PCM_VOLUME_1 - vol1, format); } diff --git a/src/pcm_mix.h b/src/pcm_mix.h index 5134bf071..086d5501e 100644 --- a/src/pcm_mix.h +++ b/src/pcm_mix.h @@ -35,7 +35,8 @@ struct audio_format; * @param size the size of both buffers in bytes * @param format the audio format of both buffers * @param portion1 a number between 0.0 and 1.0 specifying the portion - * of the first buffer in the mix; portion2 = (1.0 - portion1) + * of the first buffer in the mix; portion2 = (1.0 - portion1). The value + * NaN is used by the MixRamp code to specify that simple addition is required. */ void pcm_mix(void *buffer1, const void *buffer2, size_t size, |