libavcodec/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
Defines
#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
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]
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.

---

Define Documentation

#define AE   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 281 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 http_getc(), http_seek(), MP3lame_encode_frame(), and oggvorbis_encode_frame().

#define OFFSET

(

x

)

offsetof(Mp3AudioContext, x)

Definition at line 280 of file libmp3lame.c.

---

Function Documentation

static av_cold int MP3lame_encode_close

(

AVCodecContext *

avctx

)

[static]

Definition at line 269 of file libmp3lame.c.

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

Definition at line 172 of file libmp3lame.c.

static av_cold int MP3lame_encode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 48 of file libmp3lame.c.

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

Definition at line 142 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 294 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 287 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 282 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 119 of file libmp3lame.c.

Referenced by mp3len().

const int sBitsPerSlot[3] [static]

Initial value:

 {
    32,
    8,
    8
}

Definition at line 136 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 115 of file libmp3lame.c.

Referenced by mp3len().

const int sSamplesPerFrame[2][3] [static]

Initial value:

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

Definition at line 130 of file libmp3lame.c.

Referenced by mp3len().