libmp3lame.c File Reference

Interface to libmp3lame for mp3 encoding. More...

#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "mpegaudio.h"
#include <lame/lame.h>

Go to the source code of this file.

Data Structures
struct	Mp3AudioContext

Macros
#define	BUFFER_SIZE   (7200 + 2 * MPA_FRAME_SIZE + MPA_FRAME_SIZE / 4)
#define	OFFSET(x)   offsetof(Mp3AudioContext, x)
#define	AE   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Typedefs
typedef struct Mp3AudioContext	Mp3AudioContext

Functions
static av_cold int	MP3lame_encode_init (AVCodecContext *avctx)
static int	mp3len (void *data, int *samplesPerFrame, int *sampleRate)
static int	MP3lame_encode_frame (AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data)
static av_cold int	MP3lame_encode_close (AVCodecContext *avctx)

Variables
static const int	sSampleRates []
static const int	sBitRates [2][3][15]
static const int	sSamplesPerFrame [2][3]
static const int	sBitsPerSlot [3] = { 32, 8, 8 }
static const AVOption	options []
static const AVClass	libmp3lame_class
AVCodec	ff_libmp3lame_encoder

Detailed Description

Interface to libmp3lame for mp3 encoding.

Definition in file libmp3lame.c.

Macro Definition Documentation

#define AE   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 218 of file libmp3lame.c.

#define BUFFER_SIZE   (7200 + 2 * MPA_FRAME_SIZE + MPA_FRAME_SIZE / 4)

Definition at line 34 of file libmp3lame.c.

Referenced by MP3lame_encode_frame().

#define OFFSET

(

x

)

offsetof(Mp3AudioContext, x)

Definition at line 217 of file libmp3lame.c.

Typedef Documentation

typedef struct Mp3AudioContext Mp3AudioContext

Function Documentation

static av_cold int MP3lame_encode_close ( AVCodecContext *  avctx )

static

Definition at line 207 of file libmp3lame.c.

static int MP3lame_encode_frame ( AVCodecContext *  avctx, unsigned char *  frame, int  buf_size, void *  data  )

static

Definition at line 149 of file libmp3lame.c.

static av_cold int MP3lame_encode_init ( AVCodecContext *  avctx )

static

Definition at line 44 of file libmp3lame.c.

static int mp3len ( void *  data, int *  samplesPerFrame, int *  sampleRate  )

static

Definition at line 114 of file libmp3lame.c.

Referenced by MP3lame_encode_frame().

Variable Documentation

AVCodec ff_libmp3lame_encoder

Initial value:

 {
    .name                  = "libmp3lame",
    .type                  = AVMEDIA_TYPE_AUDIO,
    .id                    = CODEC_ID_MP3,
    .priv_data_size        = sizeof(Mp3AudioContext),
    .init                  = MP3lame_encode_init,
    .encode                = MP3lame_encode_frame,
    .close                 = MP3lame_encode_close,
    .capabilities          = CODEC_CAP_DELAY,
    .sample_fmts           = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
                                                             AV_SAMPLE_FMT_NONE },
    .supported_samplerates = sSampleRates,
    .long_name             = NULL_IF_CONFIG_SMALL("libmp3lame MP3 (MPEG audio layer 3)"),
    .priv_class            = &libmp3lame_class,
}

Definition at line 231 of file libmp3lame.c.

const AVClass libmp3lame_class

static

Initial value:

 {
    .class_name = "libmp3lame encoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 224 of file libmp3lame.c.

const AVOption options[]

static

Initial value:

 {
    { "reservoir", "Use bit reservoir.", OFFSET(reservoir), AV_OPT_TYPE_INT, { 1 }, 0, 1, AE },
    { NULL },
}

Definition at line 219 of file libmp3lame.c.

const int sBitRates[2][3][15]

static

Initial value:

 {
    {
        { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448 },
        { 0, 32, 48, 56, 64,  80,  96,  112, 128, 160, 192, 224, 256, 320, 384 },
        { 0, 32, 40, 48, 56,  64,  80,  96,  112, 128, 160, 192, 224, 256, 320 }
    },
    {
        { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256 },
        { 0,  8, 16, 24, 32, 40, 48,  56,  64,  80,  96, 112, 128, 144, 160 },
        { 0,  8, 16, 24, 32, 40, 48,  56,  64,  80,  96, 112, 128, 144, 160 }
    },
}

Definition at line 94 of file libmp3lame.c.

Referenced by mp3len().

const int sBitsPerSlot[3] = { 32, 8, 8 }

static

Definition at line 112 of file libmp3lame.c.

Referenced by mp3len().

const int sSampleRates[]

static

Initial value:

 {
    44100, 48000,  32000, 22050, 24000, 16000, 11025, 12000, 8000, 0
}

Definition at line 90 of file libmp3lame.c.

Referenced by mp3len().

const int sSamplesPerFrame[2][3]

static

Initial value:

 {
    { 384, 1152, 1152 },
    { 384, 1152,  576 }
}

Definition at line 107 of file libmp3lame.c.

Referenced by mp3len().