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-rw-r--r--src/pcm_volume.h14
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);