alsa.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <poll.h>
#include <alsa/asoundlib.h>
#include <gpac/modules/audio_out.h>

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Data Structures
struct	ALSAContext

Functions
static GF_Err	ALSA_Setup (GF_AudioOutput *dr, void *os_handle, u32 num_buffers, u32 total_duration)
static void	ALSA_Shutdown (GF_AudioOutput *dr)
static GF_Err	ALSA_Configure (GF_AudioOutput *dr, u32 *SampleRate, u32 *NbChannels, u32 *audioFormat, u64 channel_cfg)
static void	ALSA_WriteAudio (GF_AudioOutput *dr)
static u32	ALSA_GetAudioDelay (GF_AudioOutput *dr)
static GF_Err	ALSA_QueryOutputSampleRate (GF_AudioOutput *dr, u32 *desired_sr, u32 *NbChannels, u32 *nbBitsPerSample)
void *	NewALSAOutput ()
void	DeleteALSAOutput (void *ifce)
GPAC_MODULE_EXPORT const u32 *	QueryInterfaces ()
GPAC_MODULE_EXPORT GF_BaseInterface *	LoadInterface (u32 InterfaceType)
GPAC_MODULE_EXPORT void	ShutdownInterface (GF_BaseInterface *ifce)

Variables
static GF_GPACArg	ALSAArgs []

---

Data Structure Documentation

ALSAContext

struct ALSAContext

Data Fields
snd_pcm_t *	playback_handle
u32	nb_ch
u32	buf_size
u32	delay
u32	num_buffers
u32	total_duration
u32	block_align
u32	force_sr
const char *	dev_name
char *	wav_buf

Function Documentation

ALSA_Setup()

static GF_Err ALSA_Setup ( GF_AudioOutput *  dr, void *  os_handle, u32  num_buffers, u32  total_duration  )

static

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ALSA_Shutdown()

static void ALSA_Shutdown ( GF_AudioOutput *  dr )

static

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ALSA_Configure()

static GF_Err ALSA_Configure ( GF_AudioOutput *  dr, u32 *  SampleRate, u32 *  NbChannels, u32 *  audioFormat, u64  channel_cfg  )

static

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ALSA_WriteAudio()

static void ALSA_WriteAudio ( GF_AudioOutput *  dr )

static

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ALSA_GetAudioDelay()

static u32 ALSA_GetAudioDelay ( GF_AudioOutput *  dr )

static

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ALSA_QueryOutputSampleRate()

static GF_Err ALSA_QueryOutputSampleRate ( GF_AudioOutput *  dr, u32 *  desired_sr, u32 *  NbChannels, u32 *  nbBitsPerSample  )

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NewALSAOutput()

void* NewALSAOutput

(

)

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DeleteALSAOutput()

void DeleteALSAOutput

(

void *

ifce

)

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QueryInterfaces()

GPAC_MODULE_EXPORT const u32* QueryInterfaces

(

)

LoadInterface()

GPAC_MODULE_EXPORT GF_BaseInterface* LoadInterface

(

u32

InterfaceType

)

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ShutdownInterface()

GPAC_MODULE_EXPORT void ShutdownInterface

(

GF_BaseInterface *

ifce

)

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Variable Documentation

ALSAArgs

GF_GPACArg ALSAArgs[]

static

Initial value:

= {
        GF_DEF_ARG("devname", NULL, "alsa device name", "hw:0,0", NULL, GF_ARG_STRING, 0),
        GF_DEF_ARG("force-rate", NULL, "force alsa sample rate", "0", NULL, GF_ARG_INT, 0),
        {0},
}