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/demux.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)

Functions
static const 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 indev"
item_name = av_default_item_name
option = options
version = LIBAVUTIL_VERSION_INT
category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT
};
const FFInputFormat	ff_openal_demuxer

Detailed Description

OpenAL 1.1 capture device for libavdevice.

Definition in file openal-dec.c.

Macro Definition Documentation

LOWEST_AL_FORMAT

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

Definition at line 57 of file openal-dec.c.

Referenced by get_al_format_info().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(al_data, x)

Definition at line 232 of file openal-dec.c.

Function Documentation

get_al_format_info()

static const 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 64 of file openal-dec.c.

Referenced by read_header().

al_get_error()

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 82 of file openal-dec.c.

Referenced by read_header(), and read_packet().

print_al_capture_devices()

static void print_al_capture_devices ( void * log_ctx )

inlinestatic

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

Definition at line 109 of file openal-dec.c.

Referenced by read_header().

read_header()

static int read_header ( AVFormatContext * ctx )

static

Definition at line 122 of file openal-dec.c.

read_packet()

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

static

Definition at line 184 of file openal-dec.c.

read_close()

static int read_close ( AVFormatContext * ctx )

static

Definition at line 221 of file openal-dec.c.

Variable Documentation

options

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, .unit = "list_devices"  },
    {"true",  "", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, .unit = "list_devices" },
    {"false", "", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM, .unit = "list_devices" },
    {NULL},
}

Definition at line 234 of file openal-dec.c.

class_name

class_name = "openal indev"

private

Definition at line 245 of file openal-dec.c.

item_name

item_name = av_default_item_name

private

Definition at line 246 of file openal-dec.c.

option

option = options

private

Definition at line 247 of file openal-dec.c.

version

version = LIBAVUTIL_VERSION_INT

private

Definition at line 248 of file openal-dec.c.

category

category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT

private

Definition at line 249 of file openal-dec.c.

Referenced by categorize(), decode_vector(), decode_vectors(), dshow_cycle_pins(), dshow_get_device_media_types(), expand_category(), ff_instantiate_mf(), mf_create(), mono_decode(), next_input(), next_output(), show_log(), and unpack_SQVH().

[class]

const AVClass class { ... }

ff_openal_demuxer

const FFInputFormat ff_openal_demuxer

Initial value:

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

Definition at line 252 of file openal-dec.c.