libmp3lame.c File Reference

Interface to libmp3lame for mp3 encoding. More...

#include <lame/lame.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/float_dsp.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "audio_frame_queue.h"
#include "internal.h"
#include "mpegaudio.h"
#include "mpegaudiodecheader.h"

Go to the source code of this file.

Data Structures
struct	LAMEContext

Macros
#define	BUFFER_SIZE   (7200 + 2 * MPA_FRAME_SIZE + MPA_FRAME_SIZE / 4+1000)
#define	ENCODE_BUFFER(func, buf_type, buf_name)
#define	OFFSET(x)   offsetof(LAMEContext, x)
#define	AE   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Functions
static int	realloc_buffer (LAMEContext *s)
static av_cold int	mp3lame_encode_close (AVCodecContext *avctx)
static av_cold int	mp3lame_encode_init (AVCodecContext *avctx)
static int	mp3lame_encode_frame (AVCodecContext *avctx, AVPacket *avpkt, const AVFrame *frame, int *got_packet_ptr)

Variables
static const AVOption	options []
static const AVClass	libmp3lame_class
static const AVCodecDefault	libmp3lame_defaults []
static const int	libmp3lame_sample_rates []
AVCodec	ff_libmp3lame_encoder

Detailed Description

Interface to libmp3lame for mp3 encoding.

Definition in file libmp3lame.c.

Macro Definition Documentation

#define BUFFER_SIZE   (7200 + 2 * MPA_FRAME_SIZE + MPA_FRAME_SIZE / 4+1000)

Definition at line 41 of file libmp3lame.c.

Referenced by realloc_buffer().

#define ENCODE_BUFFER	(		func,
			buf_type,
			buf_name
	)

Value:

do {                        \
    lame_result = func(s->gfp,                                              \
                       (const buf_type *)buf_name[0],                       \
                       (const buf_type *)buf_name[1], frame->nb_samples,    \
                       s->buffer + s->buffer_index,                         \
                       s->buffer_size - s->buffer_index);                   \
} while (0)

Definition at line 171 of file libmp3lame.c.

Referenced by mp3lame_encode_frame().

#define OFFSET

(

x

)

offsetof(LAMEContext, x)

Definition at line 273 of file libmp3lame.c.

#define AE   AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 274 of file libmp3lame.c.

Function Documentation

static int realloc_buffer ( LAMEContext *  s )

static

Definition at line 59 of file libmp3lame.c.

Referenced by mp3lame_encode_frame(), and mp3lame_encode_init().

static av_cold int mp3lame_encode_close ( AVCodecContext *  avctx )

static

Definition at line 75 of file libmp3lame.c.

Referenced by mp3lame_encode_init().

static av_cold int mp3lame_encode_init ( AVCodecContext *  avctx )

static

Definition at line 89 of file libmp3lame.c.

static int mp3lame_encode_frame ( AVCodecContext *  avctx, AVPacket *  avpkt, const AVFrame *  frame, int *  got_packet_ptr  )

static

Definition at line 179 of file libmp3lame.c.

Variable Documentation

const AVOption options[]

static

Initial value:

= {
    { "reservoir",    "use bit reservoir", OFFSET(reservoir),    AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AE },
    { "joint_stereo", "use joint stereo",  OFFSET(joint_stereo), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, AE },
    { "abr",          "use ABR",           OFFSET(abr),          AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE },
    { NULL },
}

Definition at line 275 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 282 of file libmp3lame.c.

const AVCodecDefault libmp3lame_defaults[]

static

Initial value:

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

Definition at line 289 of file libmp3lame.c.

const int libmp3lame_sample_rates[]

static

Initial value:

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

Definition at line 294 of file libmp3lame.c.

AVCodec ff_libmp3lame_encoder

Initial value:

= {
    .name                  = "libmp3lame",
    .long_name             = NULL_IF_CONFIG_SMALL("libmp3lame MP3 (MPEG audio layer 3)"),
    .type                  = AVMEDIA_TYPE_AUDIO,
    .id                    = AV_CODEC_ID_MP3,
    .priv_data_size        = sizeof(LAMEContext),
    .init                  = mp3lame_encode_init,
    .encode2               = mp3lame_encode_frame,
    .close                 = mp3lame_encode_close,
    .capabilities          = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME,
    .sample_fmts           = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S32P,
                                                             AV_SAMPLE_FMT_FLTP,
                                                             AV_SAMPLE_FMT_S16P,
                                                             AV_SAMPLE_FMT_NONE },
    .supported_samplerates = libmp3lame_sample_rates,
    .channel_layouts       = (const uint64_t[]) { AV_CH_LAYOUT_MONO,
                                                  AV_CH_LAYOUT_STEREO,
                                                  0 },
    .priv_class            = &libmp3lame_class,
    .defaults              = libmp3lame_defaults,
}

Definition at line 298 of file libmp3lame.c.