libtwolame.c File Reference

#include <twolame.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "mpegaudio.h"

Go to the source code of this file.

Data Structures
struct	TWOLAMEContext

Macros
#define	OFFSET(x)   offsetof(TWOLAMEContext, x)
#define	AE   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Functions
static av_cold int	twolame_encode_close (AVCodecContext *avctx)
static av_cold int	twolame_encode_init (AVCodecContext *avctx)
static int	twolame_encode_frame (AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)

Variables
static const AVOption	options []
static const AVClass	twolame_class
static const FFCodecDefault	twolame_defaults []
static const int	twolame_samplerates []
const FFCodec	ff_libtwolame_encoder

Detailed Description

Interface to libtwolame for mp2 encoding.

Definition in file libtwolame.c.

Macro Definition Documentation

OFFSET

#define OFFSET

(

x

)

offsetof(TWOLAMEContext, x)

Definition at line 177 of file libtwolame.c.

AE

#define AE   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 178 of file libtwolame.c.

Function Documentation

twolame_encode_close()

static av_cold int twolame_encode_close ( AVCodecContext *  avctx )

static

Definition at line 52 of file libtwolame.c.

Referenced by twolame_encode_init().

twolame_encode_init()

static av_cold int twolame_encode_init ( AVCodecContext *  avctx )

static

Definition at line 59 of file libtwolame.c.

twolame_encode_frame()

static int twolame_encode_frame ( AVCodecContext *  avctx, AVPacket *  avpkt, const AVFrame *  frame, int *  got_packet_ptr  )

static

Definition at line 109 of file libtwolame.c.

Variable Documentation

options

const AVOption options[]

static

Initial value:

= {
    { "mode", "Mpeg Mode", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = TWOLAME_AUTO_MODE }, TWOLAME_AUTO_MODE, TWOLAME_MONO, AE, "mode"},
        { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_AUTO_MODE }, 0, 0, AE, "mode" },
        { "stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_STEREO }, 0, 0, AE, "mode" },
        { "joint_stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_JOINT_STEREO }, 0, 0, AE, "mode" },
        { "dual_channel", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_DUAL_CHANNEL }, 0, 0, AE, "mode" },
        { "mono", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_MONO }, 0, 0, AE, "mode" },
    { "psymodel", "Psychoacoustic Model", OFFSET(psymodel), AV_OPT_TYPE_INT, { .i64 = 3 }, -1, 4, AE},
    { "energy_levels","enable energy levels", OFFSET(energy), AV_OPT_TYPE_INT, { .i64 = 0 },  0, 1, AE},
    { "error_protection","enable CRC error protection", OFFSET(error_protection), AV_OPT_TYPE_INT, { .i64 = 0 },  0, 1, AE},
    { "copyright", "set MPEG Audio Copyright flag", OFFSET(copyright), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
    { "original", "set MPEG Audio Original flag", OFFSET(original), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE},
    { "verbosity", "set library optput level (0-10)", OFFSET(verbosity), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 10, AE},
    { NULL },
}

Definition at line 179 of file libtwolame.c.

twolame_class

const AVClass twolame_class

static

Initial value:

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

Definition at line 195 of file libtwolame.c.

twolame_defaults

const FFCodecDefault twolame_defaults[]

static

Initial value:

= {
    { "b", "0" },
    { NULL },
}

Definition at line 202 of file libtwolame.c.

twolame_samplerates

const int twolame_samplerates[]

static

Initial value:

= {
    16000, 22050, 24000, 32000, 44100, 48000, 0
}

Definition at line 207 of file libtwolame.c.

ff_libtwolame_encoder

const FFCodec ff_libtwolame_encoder

Initial value:

= {
    .p.name         = "libtwolame",
    CODEC_LONG_NAME("libtwolame MP2 (MPEG audio layer 2)"),
    .p.type         = AVMEDIA_TYPE_AUDIO,
    .p.id           = AV_CODEC_ID_MP2,
    .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
    .caps_internal  = FF_CODEC_CAP_NOT_INIT_THREADSAFE,
    .priv_data_size = sizeof(TWOLAMEContext),
    .init           = twolame_encode_init,
    FF_CODEC_ENCODE_CB(twolame_encode_frame),
    .close          = twolame_encode_close,
    .defaults       = twolame_defaults,
    .p.priv_class   = &twolame_class,
    .p.sample_fmts  = (const enum AVSampleFormat[]) {
        AV_SAMPLE_FMT_FLT,
        AV_SAMPLE_FMT_FLTP,
        AV_SAMPLE_FMT_S16,
        AV_SAMPLE_FMT_S16P,
        AV_SAMPLE_FMT_NONE
    },
 
    .p.ch_layouts    = (const AVChannelLayout[]) {
        AV_CHANNEL_LAYOUT_MONO,
        AV_CHANNEL_LAYOUT_STEREO,
        { 0 },
    },
    .p.supported_samplerates = twolame_samplerates,
    .p.wrapper_name = "libtwolame",
}

Definition at line 211 of file libtwolame.c.