git.sesse.net Git - ffmpeg/blob - libavcodec/faad.c

   1 /*
   2  * Faad decoder
   3  * Copyright (c) 2003 Zdenek Kabelac.
   4  * Copyright (c) 2004 Thomas Raivio.
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 /**
  24  * @file faad.c
  25  * AAC decoder.
  26  *
  27  * still a bit unfinished - but it plays something
  28  */
  29
  30 #include "avcodec.h"
  31 #include "faad.h"
  32
  33 #ifndef FAADAPI
  34 #define FAADAPI
  35 #endif
  36
  37 /*
  38  * when CONFIG_FAADBIN is defined the libfaad will be opened at runtime
  39  */
  40 //#undef CONFIG_FAADBIN
  41 //#define CONFIG_FAADBIN
  42
  43 #ifdef CONFIG_FAADBIN
  44 #include <dlfcn.h>
  45 static const char* libfaadname = "libfaad.so.0";
  46 #else
  47 #define dlopen(a)
  48 #define dlclose(a)
  49 #endif
  50
  51 typedef struct {
  52     void* handle;               /* dlopen handle */
  53     void* faac_handle;          /* FAAD library handle */
  54     int sample_size;
  55     int init;
  56
  57     /* faad calls */
  58     faacDecHandle FAADAPI (*faacDecOpen)(void);
  59     faacDecConfigurationPtr FAADAPI (*faacDecGetCurrentConfiguration)(faacDecHandle hDecoder);
  60 #ifndef FAAD2_VERSION
  61         int FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
  62                                            faacDecConfigurationPtr config);
  63         int FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
  64                                 unsigned char *buffer,
  65                                 unsigned long *samplerate,
  66                                 unsigned long *channels);
  67         int FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
  68                                 unsigned long SizeOfDecoderSpecificInfo,
  69                                 unsigned long *samplerate, unsigned long *channels);
  70         int FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
  71                                 unsigned char *buffer,
  72                                 unsigned long *bytesconsumed,
  73                                 short *sample_buffer,
  74                                 unsigned long *samples);
  75 #else
  76         unsigned char FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
  77                                                      faacDecConfigurationPtr config);
  78         long FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
  79                                    unsigned char *buffer,
  80                                  unsigned long buffer_size,
  81                                  unsigned long *samplerate,
  82                                  unsigned char *channels);
  83         char FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
  84                                  unsigned long SizeOfDecoderSpecificInfo,
  85                                  unsigned long *samplerate, unsigned char *channels);
  86         void *FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
  87                                          faacDecFrameInfo *hInfo,
  88                                          unsigned char *buffer,
  89                                                                  unsigned long buffer_size);
  90         char* FAADAPI (*faacDecGetErrorMessage)(unsigned char errcode);
  91 #endif
  92
  93     void FAADAPI (*faacDecClose)(faacDecHandle hDecoder);
  94
  95
  96 } FAACContext;
  97
  98 static const unsigned long faac_srates[] =
  99 {
 100     96000, 88200, 64000, 48000, 44100, 32000,
 101     24000, 22050, 16000, 12000, 11025, 8000
 102 };
 103
 104 static int faac_init_mp4(AVCodecContext *avctx)
 105 {
 106     FAACContext *s = (FAACContext *) avctx->priv_data;
 107     unsigned long samplerate;
 108 #ifndef FAAD2_VERSION
 109     unsigned long channels;
 110 #else
 111     unsigned char channels;
 112 #endif
 113     int r = 0;
 114
 115     if (avctx->extradata){
 116         r = s->faacDecInit2(s->faac_handle, (uint8_t*) avctx->extradata,
 117                             avctx->extradata_size,
 118                             &samplerate, &channels);
 119         if (r < 0){
 120             av_log(avctx, AV_LOG_ERROR,
 121                    "faacDecInit2 failed r:%d   sr:%ld  ch:%ld  s:%d\n",
 122                    r, samplerate, (long)channels, avctx->extradata_size);
 123         } else {
 124             avctx->sample_rate = samplerate;
 125             avctx->channels = channels;
 126             s->init = 1;
 127         }
 128     }
 129
 130     return r;
 131 }
 132
 133 static int faac_decode_frame(AVCodecContext *avctx,
 134                              void *data, int *data_size,
 135                              uint8_t *buf, int buf_size)
 136 {
 137     FAACContext *s = (FAACContext *) avctx->priv_data;
 138 #ifndef FAAD2_VERSION
 139     unsigned long bytesconsumed;
 140     short *sample_buffer = NULL;
 141     unsigned long samples;
 142     int out;
 143 #else
 144     faacDecFrameInfo frame_info;
 145     void *out;
 146 #endif
 147     if(buf_size == 0)
 148         return 0;
 149 #ifndef FAAD2_VERSION
 150     out = s->faacDecDecode(s->faac_handle,
 151                            (unsigned char*)buf,
 152                            &bytesconsumed,
 153                            data,
 154                            &samples);
 155     samples *= s->sample_size;
 156     if (data_size)
 157         *data_size = samples;
 158     return (buf_size < (int)bytesconsumed)
 159         ? buf_size : (int)bytesconsumed;
 160 #else
 161
 162     if(!s->init){
 163         unsigned long srate;
 164         unsigned char channels;
 165         int r = s->faacDecInit(s->faac_handle, buf, buf_size, &srate, &channels);
 166         if(r < 0){
 167             av_log(avctx, AV_LOG_ERROR, "faac: codec init failed: %s\n",
 168                    s->faacDecGetErrorMessage(frame_info.error));
 169             return -1;
 170         }
 171         avctx->sample_rate = srate;
 172         avctx->channels = channels;
 173         s->init = 1;
 174     }
 175
 176     out = s->faacDecDecode(s->faac_handle, &frame_info, (unsigned char*)buf, (unsigned long)buf_size);
 177
 178     if (frame_info.error > 0) {
 179         av_log(avctx, AV_LOG_ERROR, "faac: frame decoding failed: %s\n",
 180                 s->faacDecGetErrorMessage(frame_info.error));
 181         return -1;
 182     }
 183
 184     frame_info.samples *= s->sample_size;
 185     memcpy(data, out, frame_info.samples); // CHECKME - can we cheat this one
 186
 187     if (data_size)
 188         *data_size = frame_info.samples;
 189
 190     return (buf_size < (int)frame_info.bytesconsumed)
 191         ? buf_size : (int)frame_info.bytesconsumed;
 192 #endif
 193 }
 194
 195 static int faac_decode_end(AVCodecContext *avctx)
 196 {
 197     FAACContext *s = (FAACContext *) avctx->priv_data;
 198
 199     if (s->faacDecClose)
 200         s->faacDecClose(s->faac_handle);
 201
 202     dlclose(s->handle);
 203     return 0;
 204 }
 205
 206 static int faac_decode_init(AVCodecContext *avctx)
 207 {
 208     FAACContext *s = (FAACContext *) avctx->priv_data;
 209     faacDecConfigurationPtr faac_cfg;
 210
 211 #ifdef CONFIG_FAADBIN
 212     const char* err = 0;
 213
 214     s->handle = dlopen(libfaadname, RTLD_LAZY);
 215     if (!s->handle)
 216     {
 217         av_log(avctx, AV_LOG_ERROR, "FAAD library: %s could not be opened! \n%s\n",
 218                 libfaadname, dlerror());
 219         return -1;
 220     }
 221 #define dfaac(a, b) \
 222     do { static const char* n = "faacDec" #a; \
 223     if ((s->faacDec ## a = b dlsym( s->handle, n )) == NULL) { err = n; break; } } while(0)
 224     for(;;) {
 225 #else  /* !CONFIG_FAADBIN */
 226 #define dfaac(a, b)     s->faacDec ## a = faacDec ## a
 227 #endif /* CONFIG_FAADBIN */
 228
 229         // resolve all needed function calls
 230         dfaac(Open, (faacDecHandle FAADAPI (*)(void)));
 231         dfaac(GetCurrentConfiguration, (faacDecConfigurationPtr
 232                                         FAADAPI (*)(faacDecHandle)));
 233 #ifndef FAAD2_VERSION
 234         dfaac(SetConfiguration, (int FAADAPI (*)(faacDecHandle,
 235                                                            faacDecConfigurationPtr)));
 236
 237         dfaac(Init, (int FAADAPI (*)(faacDecHandle, unsigned char*,
 238                                      unsigned long*, unsigned long*)));
 239     dfaac(Init2, (int FAADAPI (*)(faacDecHandle, unsigned char*,
 240                                        unsigned long, unsigned long*,
 241                                        unsigned long*)));
 242     dfaac(Close, (void FAADAPI (*)(faacDecHandle hDecoder)));
 243         dfaac(Decode, (int FAADAPI (*)(faacDecHandle, unsigned char*,
 244                              unsigned long*, short*, unsigned long*)));
 245 #else
 246         dfaac(SetConfiguration, (unsigned char FAADAPI (*)(faacDecHandle,
 247                                                            faacDecConfigurationPtr)));
 248         dfaac(Init, (long FAADAPI (*)(faacDecHandle, unsigned char*,
 249                                      unsigned long, unsigned long*, unsigned char*)));
 250         dfaac(Init2, (char FAADAPI (*)(faacDecHandle, unsigned char*,
 251                                        unsigned long, unsigned long*,
 252                                        unsigned char*)));
 253         dfaac(Decode, (void *FAADAPI (*)(faacDecHandle, faacDecFrameInfo*,
 254                              unsigned char*, unsigned long)));
 255         dfaac(GetErrorMessage, (char* FAADAPI (*)(unsigned char)));
 256 #endif
 257 #undef dfacc
 258
 259 #ifdef CONFIG_FAADBIN
 260         break;
 261     }
 262     if (err) {
 263         dlclose(s->handle);
 264         av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot resolve %s in %s!\n",
 265                 err, libfaadname);
 266         return -1;
 267     }
 268 #endif
 269
 270     s->faac_handle = s->faacDecOpen();
 271     if (!s->faac_handle) {
 272         av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot create handler!\n");
 273         faac_decode_end(avctx);
 274         return -1;
 275     }
 276
 277
 278     faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
 279
 280     if (faac_cfg) {
 281         switch (avctx->bits_per_sample) {
 282         case 8: av_log(avctx, AV_LOG_ERROR, "FAADlib unsupported bps %d\n", avctx->bits_per_sample); break;
 283         default:
 284         case 16:
 285 #ifdef FAAD2_VERSION
 286             faac_cfg->outputFormat = FAAD_FMT_16BIT;
 287 #endif
 288             s->sample_size = 2;
 289             break;
 290         case 24:
 291 #ifdef FAAD2_VERSION
 292             faac_cfg->outputFormat = FAAD_FMT_24BIT;
 293 #endif
 294             s->sample_size = 3;
 295             break;
 296         case 32:
 297 #ifdef FAAD2_VERSION
 298             faac_cfg->outputFormat = FAAD_FMT_32BIT;
 299 #endif
 300             s->sample_size = 4;
 301             break;
 302         }
 303
 304         faac_cfg->defSampleRate = (!avctx->sample_rate) ? 44100 : avctx->sample_rate;
 305         faac_cfg->defObjectType = LC;
 306     }
 307
 308     s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
 309
 310     faac_init_mp4(avctx);
 311
 312     return 0;
 313 }
 314
 315 #define AAC_CODEC(id, name)     \
 316 AVCodec name ## _decoder = {    \
 317     #name,                      \
 318     CODEC_TYPE_AUDIO,           \
 319     id,                         \
 320     sizeof(FAACContext),        \
 321     faac_decode_init,           \
 322     NULL,                       \
 323     faac_decode_end,            \
 324     faac_decode_frame,          \
 325 }
 326
 327 // FIXME - raw AAC files - maybe just one entry will be enough
 328 AAC_CODEC(CODEC_ID_AAC, aac);
 329 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
 330 // If it's mp4 file - usually embeded into Qt Mov
 331 AAC_CODEC(CODEC_ID_MPEG4AAC, mpeg4aac);
 332 #endif
 333
 334 #undef AAC_CODEC