hvirtual/quicktime/ffmpeg/libavcodec/mp3lameaudio.c File Reference

#include "avcodec.h"
#include "mpegaudio.h"
#include <lame/lame.h>

Include dependency graph for mp3lameaudio.c:

Go to the source code of this file.

Data Structures
struct	Mp3AudioContext
Defines
#define	BUFFER_SIZE   (2*MPA_FRAME_SIZE)
Functions
static int	MP3lame_encode_init (AVCodecContext *avctx)
static int	mp3len (void *data, int *samplesPerFrame, int *sampleRate)
int	MP3lame_encode_frame (AVCodecContext *avctx, unsigned char *frame, int buf_size, void *data)
int	MP3lame_encode_close (AVCodecContext *avctx)
Variables
static const int	sSampleRates [3]
static const int	sBitRates [2][3][15]
static const int	sSamplesPerFrame [2][3]
static const int	sBitsPerSlot [3]
AVCodec	mp3lame_encoder

---

Detailed Description

Interface to libmp3lame for mp3 encoding.

Definition in file mp3lameaudio.c.

---

Define Documentation

#define BUFFER_SIZE   (2*MPA_FRAME_SIZE)

Definition at line 29 of file mp3lameaudio.c.

---

Function Documentation

int MP3lame_encode_close

(

AVCodecContext *

avctx

)

Definition at line 194 of file mp3lameaudio.c.

References av_freep(), AVCodecContext::coded_frame, Mp3AudioContext::gfp, AVCodecContext::priv_data, and s.

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

Definition at line 131 of file mp3lameaudio.c.

References av_log(), AV_LOG_ERROR, Mp3AudioContext::buffer, Mp3AudioContext::buffer_index, BUFFER_SIZE, AVCodecContext::frame_size, Mp3AudioContext::gfp, memcpy, mp3len(), NULL, AVCodecContext::priv_data, s, and Mp3AudioContext::stereo.

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static int MP3lame_encode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 37 of file mp3lameaudio.c.

References avcodec_alloc_frame(), AVCodecContext::bit_rate, AVCodecContext::channels, AVCodecContext::coded_frame, AVCodecContext::frame_size, Mp3AudioContext::gfp, NULL, AVCodecContext::priv_data, s, AVCodecContext::sample_rate, and Mp3AudioContext::stereo.

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

Definition at line 100 of file mp3lameaudio.c.

References header, sBitRates, sBitsPerSlot, sSampleRates, and sSamplesPerFrame.

Referenced by MP3lame_encode_frame().

---

Variable Documentation

AVCodec mp3lame_encoder

Initial value:

 {
    "mp3",
    CODEC_TYPE_AUDIO,
    CODEC_ID_MP3,
    sizeof(Mp3AudioContext),
    MP3lame_encode_init,
    MP3lame_encode_frame,
    MP3lame_encode_close,
    .capabilities= CODEC_CAP_DELAY,
}

Definition at line 205 of file mp3lameaudio.c.

Referenced by avcodec_register_all().

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 77 of file mp3lameaudio.c.

Referenced by mp3len().

const int sBitsPerSlot[3] [static]

Initial value:

 {
    32,
    8,
    8
}

Definition at line 94 of file mp3lameaudio.c.

Referenced by mp3len().

const int sSampleRates[3] [static]

Initial value:

 {
    44100, 48000,  32000
}

Definition at line 73 of file mp3lameaudio.c.

Referenced by mp3len().

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

Initial value:

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

Definition at line 88 of file mp3lameaudio.c.

Referenced by mp3len().