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 library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 /**
  22  * @file faad.c
  23  * AAC decoder.
  24  *
  25  * still a bit unfinished - but it plays something
  26  */
  27
  28 #include "avcodec.h"
  29 #include "faad.h"
  30
  31 #ifndef FAADAPI
  32 #define FAADAPI
  33 #endif
  34
  35 /*
  36  * when CONFIG_FAADBIN is defined the libfaad will be opened at runtime
  37  */
  38 //#undef CONFIG_FAADBIN
  39 //#define CONFIG_FAADBIN
  40
  41 #ifdef CONFIG_FAADBIN
  42 #include <dlfcn.h>
  43 static const char* libfaadname = "libfaad.so.0";
  44 #else
  45 #define dlopen(a)
  46 #define dlclose(a)
  47 #endif
  48
  49 typedef struct {
  50     void* handle;               /* dlopen handle */
  51     void* faac_handle;          /* FAAD library handle */
  52     int frame_size;
  53     int sample_size;
  54     int flags;
  55
  56     /* faad calls */
  57     faacDecHandle FAADAPI (*faacDecOpen)(void);
  58     faacDecConfigurationPtr FAADAPI (*faacDecGetCurrentConfiguration)(faacDecHandle hDecoder);
  59 #ifndef FAAD2_VERSION
  60         int FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
  61                                            faacDecConfigurationPtr config);
  62         int FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
  63                                 unsigned char *buffer,
  64                                 unsigned long *samplerate,
  65                                 unsigned long *channels);
  66         int FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
  67                                 unsigned long SizeOfDecoderSpecificInfo,
  68                                 unsigned long *samplerate, unsigned long *channels);
  69         int FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
  70                                 unsigned char *buffer,
  71                                 unsigned long *bytesconsumed,
  72                                 short *sample_buffer,
  73                                 unsigned long *samples);
  74 #else
  75         unsigned char FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
  76                                                      faacDecConfigurationPtr config);
  77         long FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
  78                                  unsigned char *buffer,
  79                                  unsigned long buffer_size,
  80                                  unsigned long *samplerate,
  81                                  unsigned char *channels);
  82         char FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
  83                                  unsigned long SizeOfDecoderSpecificInfo,
  84                                  unsigned long *samplerate, unsigned char *channels);
  85         void *FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
  86                                          faacDecFrameInfo *hInfo,
  87                                          unsigned char *buffer,
  88                                                                  unsigned long buffer_size);
  89         char* FAADAPI (*faacDecGetErrorMessage)(unsigned char errcode);
  90 #endif
  91
  92     void FAADAPI (*faacDecClose)(faacDecHandle hDecoder);
  93
  94
  95 } FAACContext;
  96
  97 static const unsigned long faac_srates[] =
  98 {
  99     96000, 88200, 64000, 48000, 44100, 32000,
 100     24000, 22050, 16000, 12000, 11025, 8000
 101 };
 102
 103 static int faac_init_mp4(AVCodecContext *avctx)
 104 {
 105     FAACContext *s = (FAACContext *) avctx->priv_data;
 106     unsigned long samplerate;
 107 #ifndef FAAD2_VERSION
 108     unsigned long channels;
 109 #else
 110     unsigned char channels;
 111 #endif
 112     int r = 0;
 113
 114     if (avctx->extradata)
 115         r = s->faacDecInit2(s->faac_handle, (uint8_t*) avctx->extradata,
 116                             avctx->extradata_size,
 117                             &samplerate, &channels);
 118     // else r = s->faacDecInit(s->faac_handle ... );
 119
 120     if (r < 0)
 121         av_log(avctx, AV_LOG_ERROR, "faacDecInit2 failed r:%d   sr:%ld  ch:%ld  s:%d\n",
 122                 r, samplerate, (long)channels, avctx->extradata_size);
 123     avctx->sample_rate = samplerate;
 124     avctx->channels = channels;
 125
 126     return r;
 127 }
 128
 129 static int faac_decode_frame(AVCodecContext *avctx,
 130                              void *data, int *data_size,
 131                              uint8_t *buf, int buf_size)
 132 {
 133     FAACContext *s = (FAACContext *) avctx->priv_data;
 134 #ifndef FAAD2_VERSION
 135     unsigned long bytesconsumed;
 136     short *sample_buffer = NULL;
 137     unsigned long samples;
 138     int out;
 139 #else
 140     faacDecFrameInfo frame_info;
 141     void *out;
 142 #endif
 143     if(buf_size == 0)
 144         return 0;
 145 #ifndef FAAD2_VERSION
 146     out = s->faacDecDecode(s->faac_handle,
 147                            (unsigned char*)buf,
 148                            &bytesconsumed,
 149                            data,
 150                            &samples);
 151     samples *= s->sample_size;
 152     if (data_size)
 153         *data_size = samples;
 154     return (buf_size < (int)bytesconsumed)
 155         ? buf_size : (int)bytesconsumed;
 156 #else
 157
 158     out = s->faacDecDecode(s->faac_handle, &frame_info, (unsigned char*)buf, (unsigned long)buf_size);
 159
 160     if (frame_info.error > 0) {
 161         av_log(avctx, AV_LOG_ERROR, "faac: frame decoding failed: %s\n",
 162                 s->faacDecGetErrorMessage(frame_info.error));
 163         return 0;
 164     }
 165
 166     frame_info.samples *= s->sample_size;
 167     memcpy(data, out, frame_info.samples); // CHECKME - can we cheat this one
 168
 169     if (data_size)
 170         *data_size = frame_info.samples;
 171
 172     return (buf_size < (int)frame_info.bytesconsumed)
 173         ? buf_size : (int)frame_info.bytesconsumed;
 174 #endif
 175 }
 176
 177 static int faac_decode_end(AVCodecContext *avctx)
 178 {
 179     FAACContext *s = (FAACContext *) avctx->priv_data;
 180
 181     if (s->faacDecClose)
 182         s->faacDecClose(s->faac_handle);
 183
 184     dlclose(s->handle);
 185     return 0;
 186 }
 187
 188 static int faac_decode_init(AVCodecContext *avctx)
 189 {
 190     FAACContext *s = (FAACContext *) avctx->priv_data;
 191     faacDecConfigurationPtr faac_cfg;
 192
 193 #ifdef CONFIG_FAADBIN
 194     const char* err = 0;
 195
 196     s->handle = dlopen(libfaadname, RTLD_LAZY);
 197     if (!s->handle)
 198     {
 199         av_log(avctx, AV_LOG_ERROR, "FAAD library: %s could not be opened! \n%s\n",
 200                 libfaadname, dlerror());
 201         return -1;
 202     }
 203 #define dfaac(a, b) \
 204     do { static const char* n = "faacDec" #a; \
 205     if ((s->faacDec ## a = b dlsym( s->handle, n )) == NULL) { err = n; break; } } while(0)
 206     for(;;) {
 207 #else  /* !CONFIG_FAADBIN */
 208 #define dfaac(a, b)     s->faacDec ## a = faacDec ## a
 209 #endif /* CONFIG_FAADBIN */
 210
 211         // resolve all needed function calls
 212         dfaac(Open, (faacDecHandle FAADAPI (*)(void)));
 213         dfaac(GetCurrentConfiguration, (faacDecConfigurationPtr
 214                                         FAADAPI (*)(faacDecHandle)));
 215 #ifndef FAAD2_VERSION
 216         dfaac(SetConfiguration, (int FAADAPI (*)(faacDecHandle,
 217                                                            faacDecConfigurationPtr)));
 218
 219         dfaac(Init, (int FAADAPI (*)(faacDecHandle, unsigned char*,
 220                                      unsigned long*, unsigned long*)));
 221     dfaac(Init2, (int FAADAPI (*)(faacDecHandle, unsigned char*,
 222                                        unsigned long, unsigned long*,
 223                                        unsigned long*)));
 224     dfaac(Close, (void FAADAPI (*)(faacDecHandle hDecoder)));
 225         dfaac(Decode, (int FAADAPI (*)(faacDecHandle, unsigned char*,
 226                              unsigned long*, short*, unsigned long*)));
 227 #else
 228         dfaac(SetConfiguration, (unsigned char FAADAPI (*)(faacDecHandle,
 229                                                            faacDecConfigurationPtr)));
 230         dfaac(Init, (long FAADAPI (*)(faacDecHandle, unsigned char*,
 231                                      unsigned long, unsigned long*, unsigned char*)));
 232         dfaac(Init2, (char FAADAPI (*)(faacDecHandle, unsigned char*,
 233                                        unsigned long, unsigned long*,
 234                                        unsigned char*)));
 235         dfaac(Decode, (void *FAADAPI (*)(faacDecHandle, faacDecFrameInfo*,
 236                              unsigned char*, unsigned long)));
 237         dfaac(GetErrorMessage, (char* FAADAPI (*)(unsigned char)));
 238 #endif
 239 #undef dfacc
 240
 241 #ifdef CONFIG_FAADBIN
 242         break;
 243     }
 244     if (err) {
 245         dlclose(s->handle);
 246         av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot resolve %s in %s!\n",
 247                 err, libfaadname);
 248         return -1;
 249     }
 250 #endif
 251
 252     s->faac_handle = s->faacDecOpen();
 253     if (!s->faac_handle) {
 254         av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot create handler!\n");
 255         faac_decode_end(avctx);
 256         return -1;
 257     }
 258
 259
 260     faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
 261
 262     if (faac_cfg) {
 263         switch (avctx->bits_per_sample) {
 264         case 8: av_log(avctx, AV_LOG_ERROR, "FAADlib unsupported bps %d\n", avctx->bits_per_sample); break;
 265         default:
 266         case 16:
 267 #ifdef FAAD2_VERSION
 268             faac_cfg->outputFormat = FAAD_FMT_16BIT;
 269 #endif
 270             s->sample_size = 2;
 271             break;
 272         case 24:
 273 #ifdef FAAD2_VERSION
 274             faac_cfg->outputFormat = FAAD_FMT_24BIT;
 275 #endif
 276             s->sample_size = 3;
 277             break;
 278         case 32:
 279 #ifdef FAAD2_VERSION
 280             faac_cfg->outputFormat = FAAD_FMT_32BIT;
 281 #endif
 282             s->sample_size = 4;
 283             break;
 284         }
 285
 286         faac_cfg->defSampleRate = (!avctx->sample_rate) ? 44100 : avctx->sample_rate;
 287         faac_cfg->defObjectType = LC;
 288     }
 289
 290     s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
 291
 292     faac_init_mp4(avctx);
 293
 294     return 0;
 295 }
 296
 297 #define AAC_CODEC(id, name)     \
 298 AVCodec name ## _decoder = {    \
 299     #name,                      \
 300     CODEC_TYPE_AUDIO,           \
 301     id,                         \
 302     sizeof(FAACContext),        \
 303     faac_decode_init,           \
 304     NULL,                       \
 305     faac_decode_end,            \
 306     faac_decode_frame,          \
 307 }
 308
 309 // FIXME - raw AAC files - maybe just one entry will be enough
 310 AAC_CODEC(CODEC_ID_AAC, aac);
 311 // If it's mp4 file - usually embeded into Qt Mov
 312 AAC_CODEC(CODEC_ID_MPEG4AAC, mpeg4aac);
 313
 314 #undef AAC_CODEC