diff options
Diffstat (limited to 'src/pcm_utils.c')
| -rw-r--r-- | src/pcm_utils.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/pcm_utils.c b/src/pcm_utils.c index a1f79f430..6c0da8817 100644 --- a/src/pcm_utils.c +++ b/src/pcm_utils.c @@ -71,6 +71,20 @@ pcm_volume_change_16(int16_t *buffer, unsigned num_samples, } } +static void +pcm_volume_change_24(int32_t *buffer, unsigned num_samples, + unsigned volume) +{ + while (num_samples > 0) { + int64_t sample = *buffer; + + sample = (sample * volume + pcm_dither() + 500) / 1000; + + *buffer++ = pcm_range(sample, 24); + --num_samples; + } +} + void pcm_volumeChange(char *buffer, int bufferSize, const struct audio_format *format, int volume) @@ -93,6 +107,11 @@ void pcm_volumeChange(char *buffer, int bufferSize, volume); break; + case 24: + pcm_volume_change_24((int32_t*)buffer, bufferSize / 4, + volume); + break; + default: FATAL("%i bits not supported by pcm_volumeChange!\n", format->bits); @@ -131,6 +150,22 @@ 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) +{ + while (num_samples > 0) { + int64_t sample1 = *buffer1; + int64_t sample2 = *buffer2++; + + sample1 = ((sample1 * volume1 + sample2 * volume2) + + pcm_dither() + 500) / 1000; + + *buffer1++ = pcm_range(sample1, 24); + --num_samples; + } +} + static void pcm_add(char *buffer1, const char *buffer2, size_t size, int vol1, int vol2, const struct audio_format *format) @@ -146,6 +181,12 @@ static void pcm_add(char *buffer1, const char *buffer2, size_t size, size / 2, vol1, vol2); break; + case 24: + pcm_add_24((int32_t*)buffer1, + (const int32_t*)buffer2, + size / 4, vol1, vol2); + break; + default: FATAL("%i bits not supported by pcm_add!\n", format->bits); } @@ -385,6 +426,16 @@ pcm_convert_8_to_16(int16_t *out, const int8_t *in, } } +static void +pcm_convert_24_to_16(int16_t *out, const int32_t *in, + unsigned num_samples) +{ + while (num_samples > 0) { + *out++ = *in++ >> 8; + --num_samples; + } +} + static const char *pcm_convertTo16bit(int8_t bits, const char *inBuffer, size_t inSize, size_t *outSize) { @@ -409,6 +460,19 @@ static const char *pcm_convertTo16bit(int8_t bits, const char *inBuffer, case 16: *outSize = inSize; return inBuffer; + + case 24: + num_samples = inSize / 4; + *outSize = num_samples * 2; + if (*outSize > len) { + len = *outSize; + buf = xrealloc(buf, len); + } + + pcm_convert_24_to_16((int16_t *)buf, + (const int32_t *)inBuffer, + num_samples); + return buf; } ERROR("only 8 or 16 bits are supported for conversion!\n"); @@ -468,6 +532,9 @@ size_t pcm_sizeOfConvBuffer(const struct audio_format *inFormat, size_t inSize, break; case 16: break; + case 24: + outSize = (outSize / 4) * 2; + break; default: FATAL("only 8 or 16 bits are supported for conversion!\n"); } |