openal-dec.c File Reference

OpenAL 1.1 capture device for libavdevice. More...

#include <AL/al.h>
#include <AL/alc.h>
#include "libavutil/opt.h"
#include "libavutil/time.h"
#include "libavformat/internal.h"
#include "avdevice.h"

Go to the source code of this file.

Data Structures
struct	al_data
struct	al_format_info

Macros
#define	LOWEST_AL_FORMAT   FFMIN(FFMIN(AL_FORMAT_MONO8,AL_FORMAT_MONO16),FFMIN(AL_FORMAT_STEREO8,AL_FORMAT_STEREO16))
#define	OFFSET(x)   offsetof(al_data, x)

Functions
static al_format_info *	get_al_format_info (ALCenum al_fmt)
	Get information about an AL_FORMAT value.
static int	al_get_error (ALCdevice *device, const char **error_msg_ret)
	Get the OpenAL error code, translated into an av/errno error code.
static void	print_al_capture_devices (void *log_ctx)
	Print out a list of OpenAL capture devices on this system.
static int	read_header (AVFormatContext *ctx)
static int	read_packet (AVFormatContext *ctx, AVPacket *pkt)
static int	read_close (AVFormatContext *ctx)

Variables
static const AVOption	options []
class {
class_name = "openal"
item_name = av_default_item_name
option = options
version = LIBAVUTIL_VERSION_INT
category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT
};
AVInputFormat	ff_openal_demuxer

Detailed Description

OpenAL 1.1 capture device for libavdevice.

Definition in file openal-dec.c.

Macro Definition Documentation

#define LOWEST_AL_FORMAT   FFMIN(FFMIN(AL_FORMAT_MONO8,AL_FORMAT_MONO16),FFMIN(AL_FORMAT_STEREO8,AL_FORMAT_STEREO16))

Definition at line 56 of file openal-dec.c.

Referenced by get_al_format_info().

#define OFFSET

(

x

)

offsetof(al_data, x)

Definition at line 223 of file openal-dec.c.

Function Documentation

static al_format_info* get_al_format_info ( ALCenum  al_fmt )

inlinestatic

Get information about an AL_FORMAT value.

Parameters

al_fmt

the AL_FORMAT value to find information about.

Returns

A pointer to a structure containing information about the AL_FORMAT value.

Definition at line 63 of file openal-dec.c.

Referenced by read_header().

static int al_get_error ( ALCdevice *  device, const char **  error_msg_ret  )

inlinestatic

Get the OpenAL error code, translated into an av/errno error code.

Parameters

device	The ALC device to check for errors.
error_msg_ret	A pointer to a char* in which to return the error message, or NULL if desired.

Returns

The error code, or 0 if there is no error.

Definition at line 81 of file openal-dec.c.

Referenced by read_header(), and read_packet().

static void print_al_capture_devices ( void *  log_ctx )

inlinestatic

Print out a list of OpenAL capture devices on this system.

Definition at line 108 of file openal-dec.c.

Referenced by read_header().

static int read_header ( AVFormatContext *  ctx )

static

Definition at line 121 of file openal-dec.c.

static int read_packet ( AVFormatContext *  ctx, AVPacket *  pkt  )

static

Definition at line 183 of file openal-dec.c.

static int read_close ( AVFormatContext *  ctx )

static

Definition at line 212 of file openal-dec.c.

Variable Documentation

const AVOption options[]

static

Initial value:

= {
    {"channels", "set number of channels",     OFFSET(channels),     AV_OPT_TYPE_INT, {.i64=2},     1, 2,      AV_OPT_FLAG_DECODING_PARAM },
    {"sample_rate", "set sample rate",         OFFSET(sample_rate),  AV_OPT_TYPE_INT, {.i64=44100}, 1, 192000, AV_OPT_FLAG_DECODING_PARAM },
    {"sample_size", "set sample size",         OFFSET(sample_size),  AV_OPT_TYPE_INT, {.i64=16},    8, 16,     AV_OPT_FLAG_DECODING_PARAM },
    {"list_devices", "list available devices", OFFSET(list_devices), AV_OPT_TYPE_INT, {.i64=0},     0, 1,      AV_OPT_FLAG_DECODING_PARAM, "list_devices"  },
    {"true",  "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
    {"false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, "list_devices" },
    {NULL},
}

Definition at line 225 of file openal-dec.c.

class_name = "openal"

Definition at line 236 of file openal-dec.c.

item_name = av_default_item_name

Definition at line 237 of file openal-dec.c.

option = options

Definition at line 238 of file openal-dec.c.

version = LIBAVUTIL_VERSION_INT

Definition at line 239 of file openal-dec.c.

category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT

Definition at line 240 of file openal-dec.c.

Referenced by av_device_next(), dshow_cycle_pins(), mono_decode(), and unpack_SQVH().

const { ... }

AVInputFormat ff_openal_demuxer

Initial value:

= {
    .name = "openal",
    .long_name = NULL_IF_CONFIG_SMALL("OpenAL audio capture device"),
    .priv_data_size = sizeof(al_data),
    .read_probe = NULL,
    .read_header = read_header,
    .read_packet = read_packet,
    .read_close = read_close,
    .flags = AVFMT_NOFILE,
    .priv_class = &class
}

Definition at line 243 of file openal-dec.c.