libavcodec/libfaad.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 libavcodec/libfaad.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_LIBFAADBIN is true libfaad will be opened at runtime
  39  */
  40 //#undef CONFIG_LIBFAADBIN
  41 //#define CONFIG_LIBFAADBIN 0
  42 //#define CONFIG_LIBFAADBIN 1
  43
  44 #if CONFIG_LIBFAADBIN
  45 #include <dlfcn.h>
  46 static const char* const libfaadname = "libfaad.so";
  47 #else
  48 #define dlopen(a)
  49 #define dlclose(a)
  50 #endif
  51
  52 typedef struct {
  53     void* handle;               /* dlopen handle */
  54     void* faac_handle;          /* FAAD library handle */
  55     int sample_size;
  56     int init;
  57
  58     /* faad calls */
  59     faacDecHandle FAADAPI (*faacDecOpen)(void);
  60     faacDecConfigurationPtr FAADAPI (*faacDecGetCurrentConfiguration)(faacDecHandle hDecoder);
  61 #ifndef FAAD2_VERSION
  62     int FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
  63                                            faacDecConfigurationPtr config);
  64     int FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
  65                                unsigned char *buffer,
  66                                unsigned long *samplerate,
  67                                unsigned long *channels);
  68     int FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
  69                                 unsigned long SizeOfDecoderSpecificInfo,
  70                                 unsigned long *samplerate, unsigned long *channels);
  71     int FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
  72                                  unsigned char *buffer,
  73                                  unsigned long *bytesconsumed,
  74                                  short *sample_buffer,
  75                                  unsigned long *samples);
  76 #else
  77     unsigned char FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
  78                                                      faacDecConfigurationPtr config);
  79     long FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
  80                                 unsigned char *buffer,
  81                                 unsigned long buffer_size,
  82                                 unsigned long *samplerate,
  83                                 unsigned char *channels);
  84     char FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
  85                                  unsigned long SizeOfDecoderSpecificInfo,
  86                                  unsigned long *samplerate, unsigned char *channels);
  87     void *FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
  88                                    faacDecFrameInfo *hInfo,
  89                                    unsigned char *buffer,
  90                                    unsigned long buffer_size);
  91     char* FAADAPI (*faacDecGetErrorMessage)(unsigned char errcode);
  92 #endif
  93
  94     void FAADAPI (*faacDecClose)(faacDecHandle hDecoder);
  95
  96
  97 } FAACContext;
  98
  99 static const unsigned long faac_srates[] =
 100 {
 101     96000, 88200, 64000, 48000, 44100, 32000,
 102     24000, 22050, 16000, 12000, 11025, 8000
 103 };
 104
 105 static void channel_setup(AVCodecContext *avctx)
 106 {
 107 #ifdef FAAD2_VERSION
 108     FAACContext *s = avctx->priv_data;
 109     if (avctx->request_channels > 0 && avctx->request_channels == 2 &&
 110         avctx->request_channels < avctx->channels) {
 111         faacDecConfigurationPtr faac_cfg;
 112         avctx->channels = 2;
 113         faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
 114         faac_cfg->downMatrix = 1;
 115         s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
 116     }
 117 #endif
 118 }
 119
 120 static av_cold int faac_init_mp4(AVCodecContext *avctx)
 121 {
 122     FAACContext *s = avctx->priv_data;
 123     unsigned long samplerate;
 124 #ifndef FAAD2_VERSION
 125     unsigned long channels;
 126 #else
 127     unsigned char channels;
 128 #endif
 129     int r = 0;
 130
 131     if (avctx->extradata){
 132         r = s->faacDecInit2(s->faac_handle, (uint8_t*) avctx->extradata,
 133                             avctx->extradata_size,
 134                             &samplerate, &channels);
 135         if (r < 0){
 136             av_log(avctx, AV_LOG_ERROR,
 137                    "faacDecInit2 failed r:%d   sr:%ld  ch:%ld  s:%d\n",
 138                    r, samplerate, (long)channels, avctx->extradata_size);
 139         } else {
 140             avctx->sample_rate = samplerate;
 141             avctx->channels = channels;
 142             channel_setup(avctx);
 143             s->init = 1;
 144         }
 145     }
 146
 147     return r;
 148 }
 149
 150 static int faac_decode_frame(AVCodecContext *avctx,
 151                              void *data, int *data_size,
 152                              uint8_t *buf, int buf_size)
 153 {
 154     FAACContext *s = avctx->priv_data;
 155 #ifndef FAAD2_VERSION
 156     unsigned long bytesconsumed;
 157     short *sample_buffer = NULL;
 158     unsigned long samples;
 159     int out;
 160 #else
 161     faacDecFrameInfo frame_info;
 162     void *out;
 163 #endif
 164     if(buf_size == 0)
 165         return 0;
 166 #ifndef FAAD2_VERSION
 167     out = s->faacDecDecode(s->faac_handle,
 168                            (unsigned char*)buf,
 169                            &bytesconsumed,
 170                            data,
 171                            &samples);
 172     samples *= s->sample_size;
 173     if (data_size)
 174         *data_size = samples;
 175     return (buf_size < (int)bytesconsumed)
 176         ? buf_size : (int)bytesconsumed;
 177 #else
 178
 179     if(!s->init){
 180         unsigned long srate;
 181         unsigned char channels;
 182         int r = s->faacDecInit(s->faac_handle, buf, buf_size, &srate, &channels);
 183         if(r < 0){
 184             av_log(avctx, AV_LOG_ERROR, "faac: codec init failed.\n");
 185             return -1;
 186         }
 187         avctx->sample_rate = srate;
 188         avctx->channels = channels;
 189         channel_setup(avctx);
 190         s->init = 1;
 191     }
 192
 193     out = s->faacDecDecode(s->faac_handle, &frame_info, (unsigned char*)buf, (unsigned long)buf_size);
 194
 195     if (frame_info.error > 0) {
 196         av_log(avctx, AV_LOG_ERROR, "faac: frame decoding failed: %s\n",
 197                s->faacDecGetErrorMessage(frame_info.error));
 198         return -1;
 199     }
 200     if (!avctx->frame_size)
 201         avctx->frame_size = frame_info.samples/avctx->channels;
 202     frame_info.samples *= s->sample_size;
 203     memcpy(data, out, frame_info.samples); // CHECKME - can we cheat this one
 204
 205     if (data_size)
 206         *data_size = frame_info.samples;
 207
 208     return (buf_size < (int)frame_info.bytesconsumed)
 209         ? buf_size : (int)frame_info.bytesconsumed;
 210 #endif
 211 }
 212
 213 static av_cold int faac_decode_end(AVCodecContext *avctx)
 214 {
 215     FAACContext *s = avctx->priv_data;
 216
 217     s->faacDecClose(s->faac_handle);
 218
 219     dlclose(s->handle);
 220     return 0;
 221 }
 222
 223 static av_cold int faac_decode_init(AVCodecContext *avctx)
 224 {
 225     FAACContext *s = avctx->priv_data;
 226     faacDecConfigurationPtr faac_cfg;
 227
 228 #if CONFIG_LIBFAADBIN
 229     const char* err = 0;
 230
 231     s->handle = dlopen(libfaadname, RTLD_LAZY);
 232     if (!s->handle)
 233     {
 234         av_log(avctx, AV_LOG_ERROR, "FAAD library: %s could not be opened! \n%s\n",
 235                libfaadname, dlerror());
 236         return -1;
 237     }
 238
 239 #define dfaac(a) do {                                                   \
 240         const char* n = AV_STRINGIFY(faacDec ## a);                     \
 241         if (!err && !(s->faacDec ## a = dlsym(s->handle, n))) {         \
 242             err = n;                                                    \
 243         }                                                               \
 244     } while(0)
 245 #else  /* !CONFIG_LIBFAADBIN */
 246 #define dfaac(a)     s->faacDec ## a = faacDec ## a
 247 #endif /* CONFIG_LIBFAADBIN */
 248
 249     // resolve all needed function calls
 250     dfaac(Open);
 251     dfaac(Close);
 252     dfaac(GetCurrentConfiguration);
 253     dfaac(SetConfiguration);
 254     dfaac(Init);
 255     dfaac(Init2);
 256     dfaac(Decode);
 257 #ifdef FAAD2_VERSION
 258     dfaac(GetErrorMessage);
 259 #endif
 260
 261 #undef dfaac
 262
 263 #if CONFIG_LIBFAADBIN
 264     if (err) {
 265         dlclose(s->handle);
 266         av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot resolve %s in %s!\n",
 267                err, libfaadname);
 268         return -1;
 269     }
 270 #endif
 271
 272     s->faac_handle = s->faacDecOpen();
 273     if (!s->faac_handle) {
 274         av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot create handler!\n");
 275         faac_decode_end(avctx);
 276         return -1;
 277     }
 278
 279
 280     faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
 281
 282     if (faac_cfg) {
 283         switch (avctx->bits_per_coded_sample) {
 284         case 8: av_log(avctx, AV_LOG_ERROR, "FAADlib unsupported bps %d\n", avctx->bits_per_coded_sample); break;
 285         default:
 286         case 16:
 287 #ifdef FAAD2_VERSION
 288             faac_cfg->outputFormat = FAAD_FMT_16BIT;
 289 #endif
 290             s->sample_size = 2;
 291             break;
 292         case 24:
 293 #ifdef FAAD2_VERSION
 294             faac_cfg->outputFormat = FAAD_FMT_24BIT;
 295 #endif
 296             s->sample_size = 3;
 297             break;
 298         case 32:
 299 #ifdef FAAD2_VERSION
 300             faac_cfg->outputFormat = FAAD_FMT_32BIT;
 301 #endif
 302             s->sample_size = 4;
 303             break;
 304         }
 305
 306         faac_cfg->defSampleRate = (!avctx->sample_rate) ? 44100 : avctx->sample_rate;
 307         faac_cfg->defObjectType = LC;
 308     }
 309
 310     s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
 311
 312     faac_init_mp4(avctx);
 313
 314     if(!s->init && avctx->channels > 0)
 315         channel_setup(avctx);
 316
 317     avctx->sample_fmt = SAMPLE_FMT_S16;
 318     return 0;
 319 }
 320
 321 AVCodec libfaad_decoder = {
 322     "libfaad",
 323     CODEC_TYPE_AUDIO,
 324     CODEC_ID_AAC,
 325     sizeof(FAACContext),
 326     faac_decode_init,
 327     NULL,
 328     faac_decode_end,
 329     faac_decode_frame,
 330     .long_name = NULL_IF_CONFIG_SMALL("libfaad AAC (Advanced Audio Codec)"),
 331 };