4483d2870aa1b0a8a02facfa0054542ac6a7a492
[libav.git] / libavcodec / libmp3lame.c
1 /*
2 * Interface to libmp3lame for mp3 encoding
3 * Copyright (c) 2002 Lennert Buytenhek <buytenh@gnu.org>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file mp3lameaudio.c
24 * Interface to libmp3lame for mp3 encoding.
25 */
26
27 #include "avcodec.h"
28 #include "mpegaudio.h"
29 #include <lame/lame.h>
30
31 #define BUFFER_SIZE (7200 + MPA_FRAME_SIZE + MPA_FRAME_SIZE/4)
32 typedef struct Mp3AudioContext {
33 lame_global_flags *gfp;
34 int stereo;
35 uint8_t buffer[BUFFER_SIZE];
36 int buffer_index;
37 } Mp3AudioContext;
38
39 static av_cold int MP3lame_encode_init(AVCodecContext *avctx)
40 {
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 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 }
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);
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 }
66 lame_set_bWriteVbrTag(s->gfp,0);
67 lame_set_disable_reservoir(s->gfp, avctx->flags2 & CODEC_FLAG2_BIT_RESERVOIR ? 0 : 1);
68 if (lame_init_params(s->gfp) < 0)
69 goto err_close;
70
71 avctx->frame_size = lame_get_framesize(s->gfp);
72
73 avctx->coded_frame= avcodec_alloc_frame();
74 avctx->coded_frame->key_frame= 1;
75
76 return 0;
77
78 err_close:
79 lame_close(s->gfp);
80 err:
81 return -1;
82 }
83
84 static const int sSampleRates[3] = {
85 44100, 48000, 32000
86 };
87
88 static 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
99 static const int sSamplesPerFrame[2][3] =
100 {
101 { 384, 1152, 1152 },
102 { 384, 1152, 576 }
103 };
104
105 static const int sBitsPerSlot[3] = {
106 32,
107 8,
108 8
109 };
110
111 static int mp3len(void *data, int *samplesPerFrame, int *sampleRate)
112 {
113 uint32_t header = AV_RB32(data);
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 }
127
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);
137
138 return *samplesPerFrame * bitRate / (bitsPerSlot * *sampleRate) + isPadded;
139 }
140
141 static int MP3lame_encode_frame(AVCodecContext *avctx,
142 unsigned char *frame, int buf_size, void *data)
143 {
144 Mp3AudioContext *s = avctx->priv_data;
145 int len;
146 int lame_result;
147
148 /* lame 3.91 dies on '1-channel interleaved' data */
149
150 if(data){
151 if (s->stereo) {
152 lame_result = lame_encode_buffer_interleaved(
153 s->gfp,
154 data,
155 avctx->frame_size,
156 s->buffer + s->buffer_index,
157 BUFFER_SIZE - s->buffer_index
158 );
159 } else {
160 lame_result = lame_encode_buffer(
161 s->gfp,
162 data,
163 data,
164 avctx->frame_size,
165 s->buffer + s->buffer_index,
166 BUFFER_SIZE - s->buffer_index
167 );
168 }
169 }else{
170 lame_result= lame_encode_flush(
171 s->gfp,
172 s->buffer + s->buffer_index,
173 BUFFER_SIZE - s->buffer_index
174 );
175 }
176
177 if(lame_result < 0){
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 }
182 return -1;
183 }
184
185 s->buffer_index += lame_result;
186
187 if(s->buffer_index<4)
188 return 0;
189
190 len= mp3len(s->buffer, NULL, NULL);
191 //av_log(avctx, AV_LOG_DEBUG, "in:%d packet-len:%d index:%d\n", avctx->frame_size, len, s->buffer_index);
192 if(len <= s->buffer_index){
193 memcpy(frame, s->buffer, len);
194 s->buffer_index -= len;
195
196 memmove(s->buffer, s->buffer+len, s->buffer_index);
197 //FIXME fix the audio codec API, so we do not need the memcpy()
198 /*for(i=0; i<len; i++){
199 av_log(avctx, AV_LOG_DEBUG, "%2X ", frame[i]);
200 }*/
201 return len;
202 }else
203 return 0;
204 }
205
206 static av_cold int MP3lame_encode_close(AVCodecContext *avctx)
207 {
208 Mp3AudioContext *s = avctx->priv_data;
209
210 av_freep(&avctx->coded_frame);
211
212 lame_close(s->gfp);
213 return 0;
214 }
215
216
217 AVCodec libmp3lame_encoder = {
218 "libmp3lame",
219 CODEC_TYPE_AUDIO,
220 CODEC_ID_MP3,
221 sizeof(Mp3AudioContext),
222 MP3lame_encode_init,
223 MP3lame_encode_frame,
224 MP3lame_encode_close,
225 .capabilities= CODEC_CAP_DELAY,
226 .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
227 .long_name= NULL_IF_CONFIG_SMALL("libmp3lame MP3 (MPEG audio layer 3)"),
228 };