123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228 |
- /*
- * Interface to libmp3lame for mp3 encoding
- * Copyright (c) 2002 Lennert Buytenhek <buytenh@gnu.org>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- /**
- * @file libavcodec/libmp3lame.c
- * Interface to libmp3lame for mp3 encoding.
- */
- #include "avcodec.h"
- #include "mpegaudio.h"
- #include <lame/lame.h>
- #define BUFFER_SIZE (7200 + 2*MPA_FRAME_SIZE + MPA_FRAME_SIZE/4)
- typedef struct Mp3AudioContext {
- lame_global_flags *gfp;
- int stereo;
- uint8_t buffer[BUFFER_SIZE];
- int buffer_index;
- } Mp3AudioContext;
- static av_cold int MP3lame_encode_init(AVCodecContext *avctx)
- {
- Mp3AudioContext *s = avctx->priv_data;
- if (avctx->channels > 2)
- return -1;
- s->stereo = avctx->channels > 1 ? 1 : 0;
- if ((s->gfp = lame_init()) == NULL)
- goto err;
- lame_set_in_samplerate(s->gfp, avctx->sample_rate);
- lame_set_out_samplerate(s->gfp, avctx->sample_rate);
- lame_set_num_channels(s->gfp, avctx->channels);
- if(avctx->compression_level == FF_COMPRESSION_DEFAULT) {
- lame_set_quality(s->gfp, 5);
- } else {
- lame_set_quality(s->gfp, avctx->compression_level);
- }
- /* lame 3.91 doesn't work in mono */
- lame_set_mode(s->gfp, JOINT_STEREO);
- lame_set_brate(s->gfp, avctx->bit_rate/1000);
- if(avctx->flags & CODEC_FLAG_QSCALE) {
- lame_set_brate(s->gfp, 0);
- lame_set_VBR(s->gfp, vbr_default);
- lame_set_VBR_q(s->gfp, avctx->global_quality / (float)FF_QP2LAMBDA);
- }
- lame_set_bWriteVbrTag(s->gfp,0);
- lame_set_disable_reservoir(s->gfp, avctx->flags2 & CODEC_FLAG2_BIT_RESERVOIR ? 0 : 1);
- if (lame_init_params(s->gfp) < 0)
- goto err_close;
- avctx->frame_size = lame_get_framesize(s->gfp);
- avctx->coded_frame= avcodec_alloc_frame();
- avctx->coded_frame->key_frame= 1;
- return 0;
- err_close:
- lame_close(s->gfp);
- err:
- return -1;
- }
- static const int sSampleRates[3] = {
- 44100, 48000, 32000
- };
- static const int sBitRates[2][3][15] = {
- { { 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}
- },
- };
- static const int sSamplesPerFrame[2][3] =
- {
- { 384, 1152, 1152 },
- { 384, 1152, 576 }
- };
- static const int sBitsPerSlot[3] = {
- 32,
- 8,
- 8
- };
- static int mp3len(void *data, int *samplesPerFrame, int *sampleRate)
- {
- uint32_t header = AV_RB32(data);
- int layerID = 3 - ((header >> 17) & 0x03);
- int bitRateID = ((header >> 12) & 0x0f);
- int sampleRateID = ((header >> 10) & 0x03);
- int bitsPerSlot = sBitsPerSlot[layerID];
- int isPadded = ((header >> 9) & 0x01);
- static int const mode_tab[4]= {2,3,1,0};
- int mode= mode_tab[(header >> 19) & 0x03];
- int mpeg_id= mode>0;
- int temp0, temp1, bitRate;
- if ( (( header >> 21 ) & 0x7ff) != 0x7ff || mode == 3 || layerID==3 || sampleRateID==3) {
- return -1;
- }
- if(!samplesPerFrame) samplesPerFrame= &temp0;
- if(!sampleRate ) sampleRate = &temp1;
- // *isMono = ((header >> 6) & 0x03) == 0x03;
- *sampleRate = sSampleRates[sampleRateID]>>mode;
- bitRate = sBitRates[mpeg_id][layerID][bitRateID] * 1000;
- *samplesPerFrame = sSamplesPerFrame[mpeg_id][layerID];
- //av_log(NULL, AV_LOG_DEBUG, "sr:%d br:%d spf:%d l:%d m:%d\n", *sampleRate, bitRate, *samplesPerFrame, layerID, mode);
- return *samplesPerFrame * bitRate / (bitsPerSlot * *sampleRate) + isPadded;
- }
- static int MP3lame_encode_frame(AVCodecContext *avctx,
- unsigned char *frame, int buf_size, void *data)
- {
- Mp3AudioContext *s = avctx->priv_data;
- int len;
- int lame_result;
- /* lame 3.91 dies on '1-channel interleaved' data */
- if(data){
- if (s->stereo) {
- lame_result = lame_encode_buffer_interleaved(
- s->gfp,
- data,
- avctx->frame_size,
- s->buffer + s->buffer_index,
- BUFFER_SIZE - s->buffer_index
- );
- } else {
- lame_result = lame_encode_buffer(
- s->gfp,
- data,
- data,
- avctx->frame_size,
- s->buffer + s->buffer_index,
- BUFFER_SIZE - s->buffer_index
- );
- }
- }else{
- lame_result= lame_encode_flush(
- s->gfp,
- s->buffer + s->buffer_index,
- BUFFER_SIZE - s->buffer_index
- );
- }
- if(lame_result < 0){
- if(lame_result==-1) {
- /* output buffer too small */
- 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);
- }
- return -1;
- }
- s->buffer_index += lame_result;
- if(s->buffer_index<4)
- return 0;
- len= mp3len(s->buffer, NULL, NULL);
- //av_log(avctx, AV_LOG_DEBUG, "in:%d packet-len:%d index:%d\n", avctx->frame_size, len, s->buffer_index);
- if(len <= s->buffer_index){
- memcpy(frame, s->buffer, len);
- s->buffer_index -= len;
- memmove(s->buffer, s->buffer+len, s->buffer_index);
- //FIXME fix the audio codec API, so we do not need the memcpy()
- /*for(i=0; i<len; i++){
- av_log(avctx, AV_LOG_DEBUG, "%2X ", frame[i]);
- }*/
- return len;
- }else
- return 0;
- }
- static av_cold int MP3lame_encode_close(AVCodecContext *avctx)
- {
- Mp3AudioContext *s = avctx->priv_data;
- av_freep(&avctx->coded_frame);
- lame_close(s->gfp);
- return 0;
- }
- AVCodec libmp3lame_encoder = {
- "libmp3lame",
- CODEC_TYPE_AUDIO,
- CODEC_ID_MP3,
- sizeof(Mp3AudioContext),
- MP3lame_encode_init,
- MP3lame_encode_frame,
- MP3lame_encode_close,
- .capabilities= CODEC_CAP_DELAY,
- .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
- .long_name= NULL_IF_CONFIG_SMALL("libmp3lame MP3 (MPEG audio layer 3)"),
- };
|