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.

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Enumeration Type Documentation

anonymous enum

Enumerator:

PCM_VOLUME_1

this value means "100% volume"

Definition at line 28 of file pcm_volume.h.

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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.