| /* |
| * 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)"), |
| }; |