malloc padding to avoid reading past the malloc()ed area.
[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 library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
0716b577 9 *
ff4ec49e 10 * This library is distributed in the hope that it will be useful,
0716b577 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
0716b577 14 *
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15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
0716b577 18 */
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19
20/**
21 * @file mp3lameaudio.c
22 * Interface to libmp3lame for mp3 encoding.
23 */
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24
25#include "avcodec.h"
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26#include "mpegaudio.h"
27#include <lame/lame.h>
28
2f996b83 29#define BUFFER_SIZE (2*MPA_FRAME_SIZE)
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30typedef struct Mp3AudioContext {
31 lame_global_flags *gfp;
0716b577 32 int stereo;
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33 uint8_t buffer[BUFFER_SIZE];
34 int buffer_index;
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35} Mp3AudioContext;
36
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37static int MP3lame_encode_init(AVCodecContext *avctx)
38{
39 Mp3AudioContext *s = avctx->priv_data;
40
41 if (avctx->channels > 2)
42 return -1;
43
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44 s->stereo = avctx->channels > 1 ? 1 : 0;
45
46 if ((s->gfp = lame_init()) == NULL)
47 goto err;
48 lame_set_in_samplerate(s->gfp, avctx->sample_rate);
e2263827 49 lame_set_out_samplerate(s->gfp, avctx->sample_rate);
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50 lame_set_num_channels(s->gfp, avctx->channels);
51 /* lame 3.91 dies on quality != 5 */
52 lame_set_quality(s->gfp, 5);
53 /* lame 3.91 doesn't work in mono */
54 lame_set_mode(s->gfp, JOINT_STEREO);
55 lame_set_brate(s->gfp, avctx->bit_rate/1000);
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56 if(avctx->flags & CODEC_FLAG_QSCALE) {
57 lame_set_brate(s->gfp, 0);
58 lame_set_VBR(s->gfp, vbr_default);
59 lame_set_VBR_q(s->gfp, avctx->global_quality / (float)FF_QP2LAMBDA);
60 }
c276af04 61 lame_set_bWriteVbrTag(s->gfp,0);
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62 if (lame_init_params(s->gfp) < 0)
63 goto err_close;
64
0f5c3f21 65 avctx->frame_size = lame_get_framesize(s->gfp);
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66
67 avctx->coded_frame= avcodec_alloc_frame();
68 avctx->coded_frame->key_frame= 1;
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69
70 return 0;
71
72err_close:
73 lame_close(s->gfp);
74err:
75 return -1;
76}
77
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78static const int sSampleRates[3] = {
79 44100, 48000, 32000
80};
81
82static const int sBitRates[2][3][15] = {
83 { { 0, 32, 64, 96,128,160,192,224,256,288,320,352,384,416,448},
84 { 0, 32, 48, 56, 64, 80, 96,112,128,160,192,224,256,320,384},
85 { 0, 32, 40, 48, 56, 64, 80, 96,112,128,160,192,224,256,320}
86 },
87 { { 0, 32, 48, 56, 64, 80, 96,112,128,144,160,176,192,224,256},
88 { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160},
89 { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160}
90 },
91};
92
93static const int sSamplesPerFrame[2][3] =
94{
95 { 384, 1152, 1152 },
96 { 384, 1152, 576 }
97};
98
99static const int sBitsPerSlot[3] = {
100 32,
101 8,
102 8
103};
104
105static int mp3len(void *data, int *samplesPerFrame, int *sampleRate)
106{
107 uint8_t *dataTmp = (uint8_t *)data;
108 uint32_t header = ( (uint32_t)dataTmp[0] << 24 ) | ( (uint32_t)dataTmp[1] << 16 ) | ( (uint32_t)dataTmp[2] << 8 ) | (uint32_t)dataTmp[3];
109 int layerID = 3 - ((header >> 17) & 0x03);
110 int bitRateID = ((header >> 12) & 0x0f);
111 int sampleRateID = ((header >> 10) & 0x03);
112 int bitsPerSlot = sBitsPerSlot[layerID];
113 int isPadded = ((header >> 9) & 0x01);
114 static int const mode_tab[4]= {2,3,1,0};
115 int mode= mode_tab[(header >> 19) & 0x03];
116 int mpeg_id= mode>0;
117 int temp0, temp1, bitRate;
118
119 if ( (( header >> 21 ) & 0x7ff) != 0x7ff || mode == 3 || layerID==3 || sampleRateID==3) {
120 return -1;
121 }
122
123 if(!samplesPerFrame) samplesPerFrame= &temp0;
124 if(!sampleRate ) sampleRate = &temp1;
125
126// *isMono = ((header >> 6) & 0x03) == 0x03;
127
128 *sampleRate = sSampleRates[sampleRateID]>>mode;
129 bitRate = sBitRates[mpeg_id][layerID][bitRateID] * 1000;
130 *samplesPerFrame = sSamplesPerFrame[mpeg_id][layerID];
131//av_log(NULL, AV_LOG_DEBUG, "sr:%d br:%d spf:%d l:%d m:%d\n", *sampleRate, bitRate, *samplesPerFrame, layerID, mode);
132
133 return *samplesPerFrame * bitRate / (bitsPerSlot * *sampleRate) + isPadded;
134}
135
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136int MP3lame_encode_frame(AVCodecContext *avctx,
137 unsigned char *frame, int buf_size, void *data)
138{
139 Mp3AudioContext *s = avctx->priv_data;
88730be6 140 int len;
0f5c3f21 141 int lame_result;
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142
143 /* lame 3.91 dies on '1-channel interleaved' data */
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144
145 if(data){
146 if (s->stereo) {
0f5c3f21 147 lame_result = lame_encode_buffer_interleaved(
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148 s->gfp,
149 data,
0f5c3f21 150 avctx->frame_size,
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151 s->buffer + s->buffer_index,
152 BUFFER_SIZE - s->buffer_index
153 );
6f824977 154 } else {
0f5c3f21 155 lame_result = lame_encode_buffer(
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156 s->gfp,
157 data,
158 data,
0f5c3f21 159 avctx->frame_size,
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160 s->buffer + s->buffer_index,
161 BUFFER_SIZE - s->buffer_index
162 );
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163 }
164 }else{
165 lame_result= lame_encode_flush(
166 s->gfp,
167 s->buffer + s->buffer_index,
168 BUFFER_SIZE - s->buffer_index
169 );
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170 }
171
172 if(lame_result==-1) {
173 /* output buffer too small */
174 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);
175 return 0;
176 }
177
178 s->buffer_index += lame_result;
179
180 if(s->buffer_index<4)
181 return 0;
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182
183 len= mp3len(s->buffer, NULL, NULL);
0f5c3f21 184//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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185 if(len <= s->buffer_index){
186 memcpy(frame, s->buffer, len);
187 s->buffer_index -= len;
188
189 memmove(s->buffer, s->buffer+len, s->buffer_index);
190 //FIXME fix the audio codec API, so we dont need the memcpy()
2f996b83 191/*for(i=0; i<len; i++){
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192 av_log(avctx, AV_LOG_DEBUG, "%2X ", frame[i]);
193}*/
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194 return len;
195 }else
196 return 0;
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197}
198
199int MP3lame_encode_close(AVCodecContext *avctx)
200{
201 Mp3AudioContext *s = avctx->priv_data;
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202
203 av_freep(&avctx->coded_frame);
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204
205 lame_close(s->gfp);
206 return 0;
207}
208
209
210AVCodec mp3lame_encoder = {
211 "mp3",
212 CODEC_TYPE_AUDIO,
80783dc2 213 CODEC_ID_MP3,
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214 sizeof(Mp3AudioContext),
215 MP3lame_encode_init,
216 MP3lame_encode_frame,
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217 MP3lame_encode_close,
218 .capabilities= CODEC_CAP_DELAY,
0716b577 219};