mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
c57c770db3
with changes by me
int->float as video uses float too
remove silent cliping to some per codec range, this should result in an error instead
remove change to utils.c as its inconsistant with video
Originally committed as revision 4533 to svn://svn.ffmpeg.org/ffmpeg/trunk
220 lines
6.4 KiB
C
220 lines
6.4 KiB
C
/*
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* Interface to libmp3lame for mp3 encoding
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* Copyright (c) 2002 Lennert Buytenhek <buytenh@gnu.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/**
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* @file mp3lameaudio.c
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* Interface to libmp3lame for mp3 encoding.
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*/
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#include "avcodec.h"
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#include "mpegaudio.h"
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#include <lame/lame.h>
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#define BUFFER_SIZE (2*MPA_FRAME_SIZE)
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typedef struct Mp3AudioContext {
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lame_global_flags *gfp;
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int stereo;
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uint8_t buffer[BUFFER_SIZE];
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int buffer_index;
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} Mp3AudioContext;
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static int MP3lame_encode_init(AVCodecContext *avctx)
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{
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Mp3AudioContext *s = avctx->priv_data;
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if (avctx->channels > 2)
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return -1;
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s->stereo = avctx->channels > 1 ? 1 : 0;
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if ((s->gfp = lame_init()) == NULL)
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goto err;
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lame_set_in_samplerate(s->gfp, avctx->sample_rate);
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lame_set_out_samplerate(s->gfp, avctx->sample_rate);
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lame_set_num_channels(s->gfp, avctx->channels);
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/* lame 3.91 dies on quality != 5 */
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lame_set_quality(s->gfp, 5);
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/* lame 3.91 doesn't work in mono */
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lame_set_mode(s->gfp, JOINT_STEREO);
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lame_set_brate(s->gfp, avctx->bit_rate/1000);
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if(avctx->flags & CODEC_FLAG_QSCALE) {
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lame_set_brate(s->gfp, 0);
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lame_set_VBR(s->gfp, vbr_default);
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lame_set_VBR_q(s->gfp, avctx->global_quality / (float)FF_QP2LAMBDA);
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}
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lame_set_bWriteVbrTag(s->gfp,0);
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if (lame_init_params(s->gfp) < 0)
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goto err_close;
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avctx->frame_size = lame_get_framesize(s->gfp);
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avctx->coded_frame= avcodec_alloc_frame();
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avctx->coded_frame->key_frame= 1;
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return 0;
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err_close:
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lame_close(s->gfp);
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err:
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return -1;
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}
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static const int sSampleRates[3] = {
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44100, 48000, 32000
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};
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static const int sBitRates[2][3][15] = {
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{ { 0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448},
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{ 0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384},
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{ 0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320}
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},
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{ { 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256},
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160},
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{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}
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},
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};
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static const int sSamplesPerFrame[2][3] =
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{
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{ 384, 1152, 1152 },
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{ 384, 1152, 576 }
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};
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static const int sBitsPerSlot[3] = {
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32,
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8,
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8
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};
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static int mp3len(void *data, int *samplesPerFrame, int *sampleRate)
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{
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uint8_t *dataTmp = (uint8_t *)data;
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uint32_t header = ( (uint32_t)dataTmp[0] << 24 ) | ( (uint32_t)dataTmp[1] << 16 ) | ( (uint32_t)dataTmp[2] << 8 ) | (uint32_t)dataTmp[3];
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int layerID = 3 - ((header >> 17) & 0x03);
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int bitRateID = ((header >> 12) & 0x0f);
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int sampleRateID = ((header >> 10) & 0x03);
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int bitsPerSlot = sBitsPerSlot[layerID];
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int isPadded = ((header >> 9) & 0x01);
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static int const mode_tab[4]= {2,3,1,0};
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int mode= mode_tab[(header >> 19) & 0x03];
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int mpeg_id= mode>0;
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int temp0, temp1, bitRate;
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if ( (( header >> 21 ) & 0x7ff) != 0x7ff || mode == 3 || layerID==3 || sampleRateID==3) {
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return -1;
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}
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if(!samplesPerFrame) samplesPerFrame= &temp0;
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if(!sampleRate ) sampleRate = &temp1;
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// *isMono = ((header >> 6) & 0x03) == 0x03;
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*sampleRate = sSampleRates[sampleRateID]>>mode;
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bitRate = sBitRates[mpeg_id][layerID][bitRateID] * 1000;
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*samplesPerFrame = sSamplesPerFrame[mpeg_id][layerID];
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//av_log(NULL, AV_LOG_DEBUG, "sr:%d br:%d spf:%d l:%d m:%d\n", *sampleRate, bitRate, *samplesPerFrame, layerID, mode);
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return *samplesPerFrame * bitRate / (bitsPerSlot * *sampleRate) + isPadded;
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}
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int MP3lame_encode_frame(AVCodecContext *avctx,
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unsigned char *frame, int buf_size, void *data)
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{
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Mp3AudioContext *s = avctx->priv_data;
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int len;
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int lame_result;
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/* lame 3.91 dies on '1-channel interleaved' data */
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if(data){
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if (s->stereo) {
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lame_result = lame_encode_buffer_interleaved(
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s->gfp,
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data,
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avctx->frame_size,
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s->buffer + s->buffer_index,
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BUFFER_SIZE - s->buffer_index
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);
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} else {
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lame_result = lame_encode_buffer(
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s->gfp,
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data,
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data,
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avctx->frame_size,
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s->buffer + s->buffer_index,
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BUFFER_SIZE - s->buffer_index
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);
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}
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}else{
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lame_result= lame_encode_flush(
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s->gfp,
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s->buffer + s->buffer_index,
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BUFFER_SIZE - s->buffer_index
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);
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}
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if(lame_result==-1) {
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/* output buffer too small */
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av_log(avctx, AV_LOG_ERROR, "lame: output buffer too small (buffer index: %d, free bytes: %d)\n", s->buffer_index, BUFFER_SIZE - s->buffer_index);
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return 0;
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}
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s->buffer_index += lame_result;
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if(s->buffer_index<4)
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return 0;
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len= mp3len(s->buffer, NULL, NULL);
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//av_log(avctx, AV_LOG_DEBUG, "in:%d packet-len:%d index:%d\n", avctx->frame_size, len, s->buffer_index);
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if(len <= s->buffer_index){
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memcpy(frame, s->buffer, len);
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s->buffer_index -= len;
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memmove(s->buffer, s->buffer+len, s->buffer_index);
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//FIXME fix the audio codec API, so we dont need the memcpy()
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/*for(i=0; i<len; i++){
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av_log(avctx, AV_LOG_DEBUG, "%2X ", frame[i]);
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}*/
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return len;
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}else
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return 0;
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}
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int MP3lame_encode_close(AVCodecContext *avctx)
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{
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Mp3AudioContext *s = avctx->priv_data;
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av_freep(&avctx->coded_frame);
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lame_close(s->gfp);
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return 0;
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}
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AVCodec mp3lame_encoder = {
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"mp3",
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CODEC_TYPE_AUDIO,
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CODEC_ID_MP3,
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sizeof(Mp3AudioContext),
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MP3lame_encode_init,
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MP3lame_encode_frame,
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MP3lame_encode_close,
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.capabilities= CODEC_CAP_DELAY,
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};
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