src/pcm_volume.h File Reference

#include "pcm_prng.h"
#include <stdint.h>
#include <stdbool.h>

Go to the source code of this file.

Enumerations

enum  { PCM_VOLUME_1 = 1024 }

Functions

static int pcm_float_to_volume (float volume)
 Converts a float value (0.0 = silence, 1.0 = 100% volume) to an integer volume value (1000 = 100%).
static int pcm_volume_dither (void)
 Returns the next volume dithering number, between -511 and +511.
bool pcm_volume (void *buffer, int length, const struct audio_format *format, int volume)
 Adjust the volume of the specified PCM buffer.


Enumeration Type Documentation

anonymous enum

Enumerator:
PCM_VOLUME_1  this value means "100% volume"

Definition at line 28 of file pcm_volume.h.


Function Documentation

static int pcm_float_to_volume ( float  volume  )  [inline, static]

Converts a float value (0.0 = silence, 1.0 = 100% volume) to an integer volume value (1000 = 100%).

Definition at line 40 of file pcm_volume.h.

bool pcm_volume ( void *  buffer,
int  length,
const struct audio_format format,
int  volume 
)

Adjust the volume of the specified PCM buffer.

Parameters:
buffer the PCM buffer
length the length of the PCM buffer
format the audio format of the PCM buffer
volume the volume between 0 and PCM_VOLUME_1
Returns:
true on success, false if the audio format is not supported

static int pcm_volume_dither ( void   )  [inline, static]

Returns the next volume dithering number, between -511 and +511.

This number is taken from a global PRNG, see pcm_prng().

Definition at line 50 of file pcm_volume.h.


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