alsa.c File Reference

Example implementation how to access the ALSA sound backend. More...

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Description

Example implementation how to access the ALSA sound backend.

Definition in file alsa.c.

#include "alsa.h"
#include <err.h>
#include <alsa/asoundlib.h>

Functions
size_t	audio_offset ()
void	audio_init ()
size_t	audio_write (const void *data, size_t amount)
void	audio_start (unsigned int rate, unsigned int channel_count)
void	audio_stop ()

Variables
static snd_pcm_t *	playback_handle = 0
static snd_pcm_sw_params_t *	sw_params = 0
static snd_pcm_hw_params_t *	hw_params = 0
static snd_pcm_sframes_t	buffer_size = 0
static snd_pcm_sframes_t	written = 0
static snd_pcm_sframes_t	delay = 0
static unsigned int	rate = 44100
static int	audio_initialised = 0

Function Documentation

audio_offset()

size_t audio_offset

(

)

Definition at line 38 of file alsa.c.

References delay, playback_handle, and written.

audio_init()

void audio_init

(

)

Definition at line 46 of file alsa.c.

References audio_initialised, buffer_size, hw_params, playback_handle, rate, and sw_params.

Referenced by audio_start().

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audio_write()

size_t audio_write	(	const void *	data,
		size_t	amount
	)

Definition at line 122 of file alsa.c.

References playback_handle, and written.

Referenced by main().

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audio_start()

void audio_start	(	unsigned int	rate,
		unsigned int	channel_count
	)

Definition at line 155 of file alsa.c.

References audio_init(), and playback_handle.

Referenced by main().

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audio_stop()

void audio_stop

(

)

Definition at line 163 of file alsa.c.

References playback_handle.

Referenced by main().

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Variable Documentation

playback_handle

snd_pcm_t* playback_handle = 0

static

Definition at line 25 of file alsa.c.

Referenced by audio_init(), audio_offset(), audio_start(), audio_stop(), and audio_write().

sw_params

snd_pcm_sw_params_t* sw_params = 0

static

Definition at line 26 of file alsa.c.

Referenced by audio_init().

hw_params

snd_pcm_hw_params_t* hw_params = 0

static

Definition at line 27 of file alsa.c.

Referenced by audio_init().

buffer_size

snd_pcm_sframes_t buffer_size = 0

static

Definition at line 28 of file alsa.c.

Referenced by audio_init().

written

snd_pcm_sframes_t written = 0

static

Definition at line 30 of file alsa.c.

Referenced by audio_offset(), and audio_write().

delay

snd_pcm_sframes_t delay = 0

static

Definition at line 31 of file alsa.c.

Referenced by CallQueue_test::Worker::Worker(), audio_offset(), IncidenceCount_test::perform_multithreadStressTest(), BusTerm_test::pushDiff(), and SyncClasslock_test::run().

rate

unsigned int rate = 44100

static

Definition at line 33 of file alsa.c.

Referenced by audio_init(), and lib::time::operator/().

audio_initialised

int audio_initialised = 0

static

Definition at line 35 of file alsa.c.

Referenced by audio_init().