Increase BUFFER_SIZE.
[libav.git] / libavcodec / libmp3lame.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
c8af74a9 31#define BUFFER_SIZE (7200 + 2*MPA_FRAME_SIZE + MPA_FRAME_SIZE/4)
0716b577 32typedef struct Mp3AudioContext {
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33 lame_global_flags *gfp;
34 int stereo;
35 uint8_t buffer[BUFFER_SIZE];
36 int buffer_index;
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37} Mp3AudioContext;
38
98a6fff9 39static av_cold int MP3lame_encode_init(AVCodecContext *avctx)
0716b577 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);
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53 if(avctx->compression_level == FF_COMPRESSION_DEFAULT) {
54 lame_set_quality(s->gfp, 5);
55 } else {
56 lame_set_quality(s->gfp, avctx->compression_level);
57 }
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58 /* lame 3.91 doesn't work in mono */
59 lame_set_mode(s->gfp, JOINT_STEREO);
60 lame_set_brate(s->gfp, avctx->bit_rate/1000);
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61 if(avctx->flags & CODEC_FLAG_QSCALE) {
62 lame_set_brate(s->gfp, 0);
63 lame_set_VBR(s->gfp, vbr_default);
64 lame_set_VBR_q(s->gfp, avctx->global_quality / (float)FF_QP2LAMBDA);
65 }
e344c1ea 66 lame_set_bWriteVbrTag(s->gfp,0);
f1618fd9 67 lame_set_disable_reservoir(s->gfp, avctx->flags2 & CODEC_FLAG2_BIT_RESERVOIR ? 0 : 1);
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68 if (lame_init_params(s->gfp) < 0)
69 goto err_close;
0716b577 70
e344c1ea 71 avctx->frame_size = lame_get_framesize(s->gfp);
115329f1 72
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73 avctx->coded_frame= avcodec_alloc_frame();
74 avctx->coded_frame->key_frame= 1;
0716b577 75
e344c1ea 76 return 0;
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77
78err_close:
e344c1ea 79 lame_close(s->gfp);
0716b577 80err:
e344c1ea 81 return -1;
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82}
83
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84static const int sSampleRates[3] = {
85 44100, 48000, 32000
86};
87
88static const int sBitRates[2][3][15] = {
89 { { 0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448},
90 { 0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384},
91 { 0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320}
92 },
93 { { 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256},
94 { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160},
95 { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}
96 },
97};
98
99static const int sSamplesPerFrame[2][3] =
100{
101 { 384, 1152, 1152 },
102 { 384, 1152, 576 }
103};
104
105static const int sBitsPerSlot[3] = {
106 32,
107 8,
108 8
109};
110
111static int mp3len(void *data, int *samplesPerFrame, int *sampleRate)
112{
2c124cb6 113 uint32_t header = AV_RB32(data);
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114 int layerID = 3 - ((header >> 17) & 0x03);
115 int bitRateID = ((header >> 12) & 0x0f);
116 int sampleRateID = ((header >> 10) & 0x03);
117 int bitsPerSlot = sBitsPerSlot[layerID];
118 int isPadded = ((header >> 9) & 0x01);
119 static int const mode_tab[4]= {2,3,1,0};
120 int mode= mode_tab[(header >> 19) & 0x03];
121 int mpeg_id= mode>0;
122 int temp0, temp1, bitRate;
123
124 if ( (( header >> 21 ) & 0x7ff) != 0x7ff || mode == 3 || layerID==3 || sampleRateID==3) {
125 return -1;
126 }
115329f1 127
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128 if(!samplesPerFrame) samplesPerFrame= &temp0;
129 if(!sampleRate ) sampleRate = &temp1;
130
131// *isMono = ((header >> 6) & 0x03) == 0x03;
132
133 *sampleRate = sSampleRates[sampleRateID]>>mode;
134 bitRate = sBitRates[mpeg_id][layerID][bitRateID] * 1000;
135 *samplesPerFrame = sSamplesPerFrame[mpeg_id][layerID];
136//av_log(NULL, AV_LOG_DEBUG, "sr:%d br:%d spf:%d l:%d m:%d\n", *sampleRate, bitRate, *samplesPerFrame, layerID, mode);
115329f1 137
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138 return *samplesPerFrame * bitRate / (bitsPerSlot * *sampleRate) + isPadded;
139}
140
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141static int MP3lame_encode_frame(AVCodecContext *avctx,
142 unsigned char *frame, int buf_size, void *data)
0716b577 143{
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144 Mp3AudioContext *s = avctx->priv_data;
145 int len;
146 int lame_result;
0716b577 147
e344c1ea 148 /* lame 3.91 dies on '1-channel interleaved' data */
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149
150 if(data){
151 if (s->stereo) {
0f5c3f21 152 lame_result = lame_encode_buffer_interleaved(
115329f1 153 s->gfp,
2f996b83 154 data,
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155 avctx->frame_size,
156 s->buffer + s->buffer_index,
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157 BUFFER_SIZE - s->buffer_index
158 );
6f824977 159 } else {
0f5c3f21 160 lame_result = lame_encode_buffer(
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161 s->gfp,
162 data,
163 data,
0f5c3f21 164 avctx->frame_size,
115329f1 165 s->buffer + s->buffer_index,
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166 BUFFER_SIZE - s->buffer_index
167 );
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168 }
169 }else{
170 lame_result= lame_encode_flush(
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171 s->gfp,
172 s->buffer + s->buffer_index,
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173 BUFFER_SIZE - s->buffer_index
174 );
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175 }
176
20836483 177 if(lame_result < 0){
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178 if(lame_result==-1) {
179 /* output buffer too small */
180 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);
181 }
20836483 182 return -1;
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183 }
184
185 s->buffer_index += lame_result;
186
187 if(s->buffer_index<4)
188 return 0;
2f996b83 189
203fa6b4 190 len= mp3len(s->buffer, NULL, NULL);
0f5c3f21 191//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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192 if(len <= s->buffer_index){
193 memcpy(frame, s->buffer, len);
194 s->buffer_index -= len;
2f996b83 195
203fa6b4 196 memmove(s->buffer, s->buffer+len, s->buffer_index);
755bfeab 197 //FIXME fix the audio codec API, so we do not need the memcpy()
2f996b83 198/*for(i=0; i<len; i++){
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199 av_log(avctx, AV_LOG_DEBUG, "%2X ", frame[i]);
200}*/
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201 return len;
202 }else
203 return 0;
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204}
205
98a6fff9 206static av_cold int MP3lame_encode_close(AVCodecContext *avctx)
0716b577 207{
e344c1ea 208 Mp3AudioContext *s = avctx->priv_data;
115329f1 209
e344c1ea 210 av_freep(&avctx->coded_frame);
0716b577 211
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212 lame_close(s->gfp);
213 return 0;
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214}
215
216
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217AVCodec libmp3lame_encoder = {
218 "libmp3lame",
0716b577 219 CODEC_TYPE_AUDIO,
80783dc2 220 CODEC_ID_MP3,
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221 sizeof(Mp3AudioContext),
222 MP3lame_encode_init,
223 MP3lame_encode_frame,
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224 MP3lame_encode_close,
225 .capabilities= CODEC_CAP_DELAY,
fd76c37f 226 .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
fe4bf374 227 .long_name= NULL_IF_CONFIG_SMALL("libmp3lame MP3 (MPEG audio layer 3)"),
0716b577 228};