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[libav.git] / libavcodec / mp3lameaudio.c
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1/*
2 * Interface to libmp3lame for mp3 encoding
3 * Copyright (c) 2002 Lennert Buytenhek <buytenh@gnu.org>
4 *
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5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
0716b577 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
0716b577 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
0716b577 16 *
ff4ec49e 17 * You should have received a copy of the GNU Lesser General Public
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
0716b577 20 */
115329f1 21
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22/**
23 * @file mp3lameaudio.c
24 * Interface to libmp3lame for mp3 encoding.
25 */
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26
27#include "avcodec.h"
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28#include "mpegaudio.h"
29#include <lame/lame.h>
30
2f996b83 31#define BUFFER_SIZE (2*MPA_FRAME_SIZE)
0716b577 32typedef struct Mp3AudioContext {
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33 lame_global_flags *gfp;
34 int stereo;
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35 uint8_t buffer[BUFFER_SIZE];
36 int buffer_index;
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37} Mp3AudioContext;
38
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39static int MP3lame_encode_init(AVCodecContext *avctx)
40{
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41 Mp3AudioContext *s = avctx->priv_data;
42
43 if (avctx->channels > 2)
44 return -1;
45
46 s->stereo = avctx->channels > 1 ? 1 : 0;
47
48 if ((s->gfp = lame_init()) == NULL)
49 goto err;
50 lame_set_in_samplerate(s->gfp, avctx->sample_rate);
51 lame_set_out_samplerate(s->gfp, avctx->sample_rate);
52 lame_set_num_channels(s->gfp, avctx->channels);
53 /* lame 3.91 dies on quality != 5 */
54 lame_set_quality(s->gfp, 5);
55 /* lame 3.91 doesn't work in mono */
56 lame_set_mode(s->gfp, JOINT_STEREO);
57 lame_set_brate(s->gfp, avctx->bit_rate/1000);
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58 if(avctx->flags & CODEC_FLAG_QSCALE) {
59 lame_set_brate(s->gfp, 0);
60 lame_set_VBR(s->gfp, vbr_default);
61 lame_set_VBR_q(s->gfp, avctx->global_quality / (float)FF_QP2LAMBDA);
62 }
c276af04 63 lame_set_bWriteVbrTag(s->gfp,0);
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64 if (lame_init_params(s->gfp) < 0)
65 goto err_close;
0716b577 66
bb270c08 67 avctx->frame_size = lame_get_framesize(s->gfp);
115329f1 68
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69 avctx->coded_frame= avcodec_alloc_frame();
70 avctx->coded_frame->key_frame= 1;
0716b577 71
bb270c08 72 return 0;
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73
74err_close:
bb270c08 75 lame_close(s->gfp);
0716b577 76err:
bb270c08 77 return -1;
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78}
79
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80static const int sSampleRates[3] = {
81 44100, 48000, 32000
82};
83
84static const int sBitRates[2][3][15] = {
85 { { 0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448},
86 { 0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384},
87 { 0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320}
88 },
89 { { 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256},
90 { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160},
91 { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}
92 },
93};
94
95static const int sSamplesPerFrame[2][3] =
96{
97 { 384, 1152, 1152 },
98 { 384, 1152, 576 }
99};
100
101static const int sBitsPerSlot[3] = {
102 32,
103 8,
104 8
105};
106
107static int mp3len(void *data, int *samplesPerFrame, int *sampleRate)
108{
109 uint8_t *dataTmp = (uint8_t *)data;
110 uint32_t header = ( (uint32_t)dataTmp[0] << 24 ) | ( (uint32_t)dataTmp[1] << 16 ) | ( (uint32_t)dataTmp[2] << 8 ) | (uint32_t)dataTmp[3];
111 int layerID = 3 - ((header >> 17) & 0x03);
112 int bitRateID = ((header >> 12) & 0x0f);
113 int sampleRateID = ((header >> 10) & 0x03);
114 int bitsPerSlot = sBitsPerSlot[layerID];
115 int isPadded = ((header >> 9) & 0x01);
116 static int const mode_tab[4]= {2,3,1,0};
117 int mode= mode_tab[(header >> 19) & 0x03];
118 int mpeg_id= mode>0;
119 int temp0, temp1, bitRate;
120
121 if ( (( header >> 21 ) & 0x7ff) != 0x7ff || mode == 3 || layerID==3 || sampleRateID==3) {
122 return -1;
123 }
115329f1 124
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125 if(!samplesPerFrame) samplesPerFrame= &temp0;
126 if(!sampleRate ) sampleRate = &temp1;
127
128// *isMono = ((header >> 6) & 0x03) == 0x03;
129
130 *sampleRate = sSampleRates[sampleRateID]>>mode;
131 bitRate = sBitRates[mpeg_id][layerID][bitRateID] * 1000;
132 *samplesPerFrame = sSamplesPerFrame[mpeg_id][layerID];
133//av_log(NULL, AV_LOG_DEBUG, "sr:%d br:%d spf:%d l:%d m:%d\n", *sampleRate, bitRate, *samplesPerFrame, layerID, mode);
115329f1 134
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135 return *samplesPerFrame * bitRate / (bitsPerSlot * *sampleRate) + isPadded;
136}
137
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138int MP3lame_encode_frame(AVCodecContext *avctx,
139 unsigned char *frame, int buf_size, void *data)
140{
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141 Mp3AudioContext *s = avctx->priv_data;
142 int len;
143 int lame_result;
0716b577 144
bb270c08 145 /* lame 3.91 dies on '1-channel interleaved' data */
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146
147 if(data){
148 if (s->stereo) {
0f5c3f21 149 lame_result = lame_encode_buffer_interleaved(
115329f1 150 s->gfp,
2f996b83 151 data,
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152 avctx->frame_size,
153 s->buffer + s->buffer_index,
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154 BUFFER_SIZE - s->buffer_index
155 );
6f824977 156 } else {
0f5c3f21 157 lame_result = lame_encode_buffer(
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158 s->gfp,
159 data,
160 data,
0f5c3f21 161 avctx->frame_size,
115329f1 162 s->buffer + s->buffer_index,
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163 BUFFER_SIZE - s->buffer_index
164 );
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165 }
166 }else{
167 lame_result= lame_encode_flush(
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168 s->gfp,
169 s->buffer + s->buffer_index,
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170 BUFFER_SIZE - s->buffer_index
171 );
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172 }
173
174 if(lame_result==-1) {
175 /* output buffer too small */
176 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);
177 return 0;
178 }
179
180 s->buffer_index += lame_result;
181
182 if(s->buffer_index<4)
183 return 0;
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184
185 len= mp3len(s->buffer, NULL, NULL);
0f5c3f21 186//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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187 if(len <= s->buffer_index){
188 memcpy(frame, s->buffer, len);
189 s->buffer_index -= len;
190
191 memmove(s->buffer, s->buffer+len, s->buffer_index);
192 //FIXME fix the audio codec API, so we dont need the memcpy()
2f996b83 193/*for(i=0; i<len; i++){
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194 av_log(avctx, AV_LOG_DEBUG, "%2X ", frame[i]);
195}*/
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196 return len;
197 }else
198 return 0;
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199}
200
201int MP3lame_encode_close(AVCodecContext *avctx)
202{
bb270c08 203 Mp3AudioContext *s = avctx->priv_data;
115329f1 204
befaced5 205 av_freep(&avctx->coded_frame);
0716b577 206
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207 lame_close(s->gfp);
208 return 0;
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209}
210
211
212AVCodec mp3lame_encoder = {
213 "mp3",
214 CODEC_TYPE_AUDIO,
80783dc2 215 CODEC_ID_MP3,
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216 sizeof(Mp3AudioContext),
217 MP3lame_encode_init,
218 MP3lame_encode_frame,
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219 MP3lame_encode_close,
220 .capabilities= CODEC_CAP_DELAY,
0716b577 221};