diff options
Diffstat (limited to 'src/pcm_volume.h')
| -rw-r--r-- | src/pcm_volume.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/pcm_volume.h b/src/pcm_volume.h index 44ced88af..1b5e7fb0e 100644 --- a/src/pcm_volume.h +++ b/src/pcm_volume.h @@ -40,6 +40,10 @@ pcm_float_to_volume(float volume) return volume * PCM_VOLUME_1 + 0.5; } +/** + * Returns the next volume dithering number, between -511 and +511. + * This number is taken from a global PRNG, see pcm_prng(). + */ static inline int pcm_volume_dither(void) { @@ -51,8 +55,16 @@ pcm_volume_dither(void) return (r & 511) - ((r >> 9) & 511); } +/** + * Adjust the volume of the specified PCM buffer. + * + * @param buffer the PCM buffer + * @param length the length of the PCM buffer + * @param format the audio format of the PCM buffer + * @param volume the volume between 0 and #PCM_VOLUME_1 + */ void -pcm_volume(void *buffer, int bufferSize, +pcm_volume(void *buffer, int length, const struct audio_format *format, int volume); |