libavcodec/libamr.c

   1 /*
   2  * AMR Audio decoder stub
   3  * Copyright (c) 2003 the ffmpeg project
   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  /** @file
  23  * Adaptive Multi-Rate (AMR) Audio decoder stub.
  24  *
  25  * This code implements both an AMR-NarrowBand (AMR-NB) and an AMR-WideBand
  26  * (AMR-WB) audio encoder/decoder through external reference code from
  27  * http://www.3gpp.org/. The license of the code from 3gpp is unclear so you
  28  * have to download the code separately. Two versions exists: One fixed-point
  29  * and one floating-point. For some reason the float encoder is significantly
  30  * faster at least on a P4 1.5GHz (0.9s instead of 9.9s on a 30s audio clip
  31  * at MR102). Both float and fixed point are supported for AMR-NB, but only
  32  * float for AMR-WB.
  33  *
  34  * \section AMR-NB
  35  *
  36  * \subsection Float
  37  * The float version (default) can be downloaded from:
  38  * http://www.3gpp.org/ftp/Specs/archive/26_series/26.104/26104-610.zip
  39  *
  40  * \subsection Fixed-point
  41  * The fixed-point (TS26.073) can be downloaded from:
  42  * http://www.3gpp.org/ftp/Specs/archive/26_series/26.073/26073-600.zip
  43  *
  44  * \subsection Specification
  45  * The specification for AMR-NB can be found in TS 26.071
  46  * (http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other
  47  * info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm.
  48  *
  49  * \section AMR-WB
  50  *
  51  * \subsection Float
  52  * The reference code can be downloaded from:
  53  * http://www.3gpp.org/ftp/Specs/archive/26_series/26.204/26204-600.zip
  54  *
  55  * \subsection Fixed-point
  56  * If someone wants to use the fixed point version it can be downloaded from:
  57  * http://www.3gpp.org/ftp/Specs/archive/26_series/26.173/26173-571.zip.
  58  *
  59  * \subsection Specification
  60  * The specification for AMR-WB can be found in TS 26.171
  61  * (http://www.3gpp.org/ftp/Specs/html-info/26171.htm) and some other
  62  * info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm.
  63  *
  64  */
  65
  66 #include "avcodec.h"
  67
  68 #if CONFIG_LIBAMR_NB_FIXED
  69
  70 #define MMS_IO
  71
  72 #include "amr/sp_dec.h"
  73 #include "amr/d_homing.h"
  74 #include "amr/typedef.h"
  75 #include "amr/sp_enc.h"
  76 #include "amr/sid_sync.h"
  77 #include "amr/e_homing.h"
  78
  79 #else
  80 #include <amrnb/interf_dec.h>
  81 #include <amrnb/interf_enc.h>
  82 #endif
  83
  84 static const char nb_bitrate_unsupported[] =
  85     "bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n";
  86 static const char wb_bitrate_unsupported[] =
  87     "bitrate not supported: use one of 6.6k, 8.85k, 12.65k, 14.25k, 15.85k, 18.25k, 19.85k, 23.05k, or 23.85k\n";
  88
  89 /* Common code for fixed and float version*/
  90 typedef struct AMR_bitrates
  91 {
  92     int rate;
  93     enum Mode mode;
  94 } AMR_bitrates;
  95
  96 /* Match desired bitrate */
  97 static int getBitrateMode(int bitrate)
  98 {
  99     /* make the correspondance between bitrate and mode */
 100     AMR_bitrates rates[]={ {4750,MR475},
 101                            {5150,MR515},
 102                            {5900,MR59},
 103                            {6700,MR67},
 104                            {7400,MR74},
 105                            {7950,MR795},
 106                            {10200,MR102},
 107                            {12200,MR122},
 108                          };
 109     int i;
 110
 111     for(i=0;i<8;i++)
 112     {
 113         if(rates[i].rate==bitrate)
 114         {
 115             return rates[i].mode;
 116         }
 117     }
 118     /* no bitrate matching, return an error */
 119     return -1;
 120 }
 121
 122 static void amr_decode_fix_avctx(AVCodecContext * avctx)
 123 {
 124     const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB);
 125
 126     if(avctx->sample_rate == 0)
 127     {
 128         avctx->sample_rate = 8000 * is_amr_wb;
 129     }
 130
 131     if(avctx->channels == 0)
 132     {
 133         avctx->channels = 1;
 134     }
 135
 136     avctx->frame_size = 160 * is_amr_wb;
 137     avctx->sample_fmt = SAMPLE_FMT_S16;
 138 }
 139
 140 #if CONFIG_LIBAMR_NB_FIXED
 141 /* fixed point version*/
 142 /* frame size in serial bitstream file (frame type + serial stream + flags) */
 143 #define SERIAL_FRAMESIZE (1+MAX_SERIAL_SIZE+5)
 144
 145 typedef struct AMRContext {
 146     int frameCount;
 147     Speech_Decode_FrameState *speech_decoder_state;
 148     enum RXFrameType rx_type;
 149     enum Mode mode;
 150     Word16 reset_flag;
 151     Word16 reset_flag_old;
 152
 153     int enc_bitrate;
 154     Speech_Encode_FrameState *enstate;
 155     sid_syncState *sidstate;
 156     enum TXFrameType tx_frametype;
 157 } AMRContext;
 158
 159 static av_cold int amr_nb_decode_init(AVCodecContext * avctx)
 160 {
 161     AMRContext *s = avctx->priv_data;
 162
 163     s->frameCount=0;
 164     s->speech_decoder_state=NULL;
 165     s->rx_type = (enum RXFrameType)0;
 166     s->mode= (enum Mode)0;
 167     s->reset_flag=0;
 168     s->reset_flag_old=1;
 169
 170     if(Speech_Decode_Frame_init(&s->speech_decoder_state, "Decoder"))
 171     {
 172         av_log(avctx, AV_LOG_ERROR, "Speech_Decode_Frame_init error\n");
 173         return -1;
 174     }
 175
 176     amr_decode_fix_avctx(avctx);
 177
 178     if(avctx->channels > 1)
 179     {
 180         av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
 181         return -1;
 182     }
 183
 184     return 0;
 185 }
 186
 187 static av_cold int amr_nb_encode_init(AVCodecContext * avctx)
 188 {
 189     AMRContext *s = avctx->priv_data;
 190
 191     s->frameCount=0;
 192     s->speech_decoder_state=NULL;
 193     s->rx_type = (enum RXFrameType)0;
 194     s->mode= (enum Mode)0;
 195     s->reset_flag=0;
 196     s->reset_flag_old=1;
 197
 198     if(avctx->sample_rate!=8000)
 199     {
 200         av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
 201         return -1;
 202     }
 203
 204     if(avctx->channels!=1)
 205     {
 206         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
 207         return -1;
 208     }
 209
 210     avctx->frame_size=160;
 211     avctx->coded_frame= avcodec_alloc_frame();
 212
 213     if(Speech_Encode_Frame_init(&s->enstate, 0, "encoder") || sid_sync_init (&s->sidstate))
 214     {
 215         av_log(avctx, AV_LOG_ERROR, "Speech_Encode_Frame_init error\n");
 216         return -1;
 217     }
 218
 219     if((s->enc_bitrate=getBitrateMode(avctx->bit_rate))<0)
 220     {
 221         av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
 222         return -1;
 223     }
 224
 225     return 0;
 226 }
 227
 228 static av_cold int amr_nb_encode_close(AVCodecContext * avctx)
 229 {
 230     AMRContext *s = avctx->priv_data;
 231
 232     Speech_Encode_Frame_exit(&s->enstate);
 233     sid_sync_exit (&s->sidstate);
 234     av_freep(&avctx->coded_frame);
 235     return 0;
 236 }
 237
 238 static av_cold int amr_nb_decode_close(AVCodecContext * avctx)
 239 {
 240     AMRContext *s = avctx->priv_data;
 241
 242     Speech_Decode_Frame_exit(&s->speech_decoder_state);
 243     return 0;
 244 }
 245
 246 static int amr_nb_decode_frame(AVCodecContext * avctx,
 247             void *data, int *data_size,
 248             const uint8_t * buf, int buf_size)
 249 {
 250     AMRContext *s = avctx->priv_data;
 251     const uint8_t*amrData=buf;
 252     int offset=0;
 253     UWord8 toc, q, ft;
 254     Word16 serial[SERIAL_FRAMESIZE];   /* coded bits */
 255     Word16 *synth;
 256     UWord8 *packed_bits;
 257     static Word16 packed_size[16] = {12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0};
 258     int i;
 259
 260     //printf("amr_decode_frame data_size=%i buf=0x%X buf_size=%d frameCount=%d!!\n",*data_size,buf,buf_size,s->frameCount);
 261
 262     synth=data;
 263
 264     toc=amrData[offset];
 265     /* read rest of the frame based on ToC byte */
 266     q  = (toc >> 2) & 0x01;
 267     ft = (toc >> 3) & 0x0F;
 268
 269     //printf("offset=%d, packet_size=%d amrData= 0x%X %X %X %X\n",offset,packed_size[ft],amrData[offset],amrData[offset+1],amrData[offset+2],amrData[offset+3]);
 270
 271     offset++;
 272
 273     packed_bits=amrData+offset;
 274
 275     offset+=packed_size[ft];
 276
 277     //Unsort and unpack bits
 278     s->rx_type = UnpackBits(q, ft, packed_bits, &s->mode, &serial[1]);
 279
 280     //We have a new frame
 281     s->frameCount++;
 282
 283     if (s->rx_type == RX_NO_DATA)
 284     {
 285         s->mode = s->speech_decoder_state->prev_mode;
 286     }
 287     else {
 288         s->speech_decoder_state->prev_mode = s->mode;
 289     }
 290
 291     /* if homed: check if this frame is another homing frame */
 292     if (s->reset_flag_old == 1)
 293     {
 294         /* only check until end of first subframe */
 295         s->reset_flag = decoder_homing_frame_test_first(&serial[1], s->mode);
 296     }
 297     /* produce encoder homing frame if homed & input=decoder homing frame */
 298     if ((s->reset_flag != 0) && (s->reset_flag_old != 0))
 299     {
 300         for (i = 0; i < L_FRAME; i++)
 301         {
 302             synth[i] = EHF_MASK;
 303         }
 304     }
 305     else
 306     {
 307         /* decode frame */
 308         Speech_Decode_Frame(s->speech_decoder_state, s->mode, &serial[1], s->rx_type, synth);
 309     }
 310
 311     //Each AMR-frame results in 160 16-bit samples
 312     *data_size=160*2;
 313
 314     /* if not homed: check whether current frame is a homing frame */
 315     if (s->reset_flag_old == 0)
 316     {
 317         /* check whole frame */
 318         s->reset_flag = decoder_homing_frame_test(&serial[1], s->mode);
 319     }
 320     /* reset decoder if current frame is a homing frame */
 321     if (s->reset_flag != 0)
 322     {
 323         Speech_Decode_Frame_reset(s->speech_decoder_state);
 324     }
 325     s->reset_flag_old = s->reset_flag;
 326
 327     return offset;
 328 }
 329
 330
 331 static int amr_nb_encode_frame(AVCodecContext *avctx,
 332                             unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
 333 {
 334     short serial_data[250] = {0};
 335     AMRContext *s = avctx->priv_data;
 336     int written;
 337
 338     s->reset_flag = encoder_homing_frame_test(data);
 339
 340     Speech_Encode_Frame(s->enstate, s->enc_bitrate, data, &serial_data[1], &s->mode);
 341
 342     /* add frame type and mode */
 343     sid_sync (s->sidstate, s->mode, &s->tx_frametype);
 344
 345     written = PackBits(s->mode, s->enc_bitrate, s->tx_frametype, &serial_data[1], frame);
 346
 347     if (s->reset_flag != 0)
 348     {
 349         Speech_Encode_Frame_reset(s->enstate);
 350         sid_sync_reset(s->sidstate);
 351     }
 352     return written;
 353 }
 354
 355
 356 #elif CONFIG_LIBAMR_NB /* Float point version*/
 357
 358 typedef struct AMRContext {
 359     int frameCount;
 360     void * decState;
 361     int *enstate;
 362     int enc_bitrate;
 363 } AMRContext;
 364
 365 static av_cold int amr_nb_decode_init(AVCodecContext * avctx)
 366 {
 367     AMRContext *s = avctx->priv_data;
 368
 369     s->frameCount=0;
 370     s->decState=Decoder_Interface_init();
 371     if(!s->decState)
 372     {
 373         av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n");
 374         return -1;
 375     }
 376
 377     amr_decode_fix_avctx(avctx);
 378
 379     if(avctx->channels > 1)
 380     {
 381         av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n");
 382         return -1;
 383     }
 384
 385     return 0;
 386 }
 387
 388 static av_cold int amr_nb_encode_init(AVCodecContext * avctx)
 389 {
 390     AMRContext *s = avctx->priv_data;
 391
 392     s->frameCount=0;
 393
 394     if(avctx->sample_rate!=8000)
 395     {
 396         av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n");
 397         return -1;
 398     }
 399
 400     if(avctx->channels!=1)
 401     {
 402         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
 403         return -1;
 404     }
 405
 406     avctx->frame_size=160;
 407     avctx->coded_frame= avcodec_alloc_frame();
 408
 409     s->enstate=Encoder_Interface_init(0);
 410     if(!s->enstate)
 411     {
 412         av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n");
 413         return -1;
 414     }
 415
 416     if((s->enc_bitrate=getBitrateMode(avctx->bit_rate))<0)
 417     {
 418         av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
 419         return -1;
 420     }
 421
 422     return 0;
 423 }
 424
 425 static av_cold int amr_nb_decode_close(AVCodecContext * avctx)
 426 {
 427     AMRContext *s = avctx->priv_data;
 428
 429     Decoder_Interface_exit(s->decState);
 430     return 0;
 431 }
 432
 433 static av_cold int amr_nb_encode_close(AVCodecContext * avctx)
 434 {
 435     AMRContext *s = avctx->priv_data;
 436
 437     Encoder_Interface_exit(s->enstate);
 438     av_freep(&avctx->coded_frame);
 439     return 0;
 440 }
 441
 442 static int amr_nb_decode_frame(AVCodecContext * avctx,
 443             void *data, int *data_size,
 444             const uint8_t * buf, int buf_size)
 445 {
 446     AMRContext *s = avctx->priv_data;
 447     const uint8_t*amrData=buf;
 448     static const uint8_t block_size[16]={ 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
 449     enum Mode dec_mode;
 450     int packet_size;
 451
 452     /* av_log(NULL,AV_LOG_DEBUG,"amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n",buf,buf_size,s->frameCount); */
 453
 454     dec_mode = (buf[0] >> 3) & 0x000F;
 455     packet_size = block_size[dec_mode]+1;
 456
 457     if(packet_size > buf_size) {
 458         av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", buf_size, packet_size);
 459         return -1;
 460     }
 461
 462     s->frameCount++;
 463     /* av_log(NULL,AV_LOG_DEBUG,"packet_size=%d amrData= 0x%X %X %X %X\n",packet_size,amrData[0],amrData[1],amrData[2],amrData[3]); */
 464     /* call decoder */
 465     Decoder_Interface_Decode(s->decState, amrData, data, 0);
 466     *data_size=160*2;
 467
 468     return packet_size;
 469 }
 470
 471 static int amr_nb_encode_frame(AVCodecContext *avctx,
 472                             unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
 473 {
 474     AMRContext *s = avctx->priv_data;
 475     int written;
 476
 477     if((s->enc_bitrate=getBitrateMode(avctx->bit_rate))<0)
 478     {
 479         av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported);
 480         return -1;
 481     }
 482
 483     written = Encoder_Interface_Encode(s->enstate,
 484         s->enc_bitrate,
 485         data,
 486         frame,
 487         0);
 488     /* av_log(NULL,AV_LOG_DEBUG,"amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n",written, s->enc_bitrate, frame[0] ); */
 489
 490     return written;
 491 }
 492
 493 #endif
 494
 495 #if CONFIG_LIBAMR_NB || CONFIG_LIBAMR_NB_FIXED
 496
 497 AVCodec libamr_nb_decoder =
 498 {
 499     "libamr_nb",
 500     CODEC_TYPE_AUDIO,
 501     CODEC_ID_AMR_NB,
 502     sizeof(AMRContext),
 503     amr_nb_decode_init,
 504     NULL,
 505     amr_nb_decode_close,
 506     amr_nb_decode_frame,
 507     .long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"),
 508 };
 509
 510 AVCodec libamr_nb_encoder =
 511 {
 512     "libamr_nb",
 513     CODEC_TYPE_AUDIO,
 514     CODEC_ID_AMR_NB,
 515     sizeof(AMRContext),
 516     amr_nb_encode_init,
 517     amr_nb_encode_frame,
 518     amr_nb_encode_close,
 519     NULL,
 520     .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
 521     .long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"),
 522 };
 523
 524 #endif
 525
 526 /* -----------AMR wideband ------------*/
 527 #if CONFIG_LIBAMR_WB
 528
 529 #ifdef _TYPEDEF_H
 530 //To avoid duplicate typedefs from typedef in amr-nb
 531 #define typedef_h
 532 #endif
 533
 534 #include <amrwb/enc_if.h>
 535 #include <amrwb/dec_if.h>
 536 #include <amrwb/if_rom.h>
 537
 538 /* Common code for fixed and float version*/
 539 typedef struct AMRWB_bitrates
 540 {
 541     int rate;
 542     int mode;
 543 } AMRWB_bitrates;
 544
 545 static int getWBBitrateMode(int bitrate)
 546 {
 547     /* make the correspondance between bitrate and mode */
 548     AMRWB_bitrates rates[]={ {6600,0},
 549                            {8850,1},
 550                            {12650,2},
 551                            {14250,3},
 552                            {15850,4},
 553                            {18250,5},
 554                            {19850,6},
 555                            {23050,7},
 556                            {23850,8},
 557                          };
 558     int i;
 559
 560     for(i=0;i<9;i++)
 561     {
 562         if(rates[i].rate==bitrate)
 563         {
 564             return rates[i].mode;
 565         }
 566     }
 567     /* no bitrate matching, return an error */
 568     return -1;
 569 }
 570
 571
 572 typedef struct AMRWBContext {
 573     int frameCount;
 574     void *state;
 575     int mode;
 576     Word16 allow_dtx;
 577 } AMRWBContext;
 578
 579 static int amr_wb_encode_init(AVCodecContext * avctx)
 580 {
 581     AMRWBContext *s = avctx->priv_data;
 582
 583     s->frameCount=0;
 584
 585     if(avctx->sample_rate!=16000)
 586     {
 587         av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n");
 588         return -1;
 589     }
 590
 591     if(avctx->channels!=1)
 592     {
 593         av_log(avctx, AV_LOG_ERROR, "Only mono supported\n");
 594         return -1;
 595     }
 596
 597     if((s->mode=getWBBitrateMode(avctx->bit_rate))<0)
 598     {
 599         av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported);
 600         return -1;
 601     }
 602
 603     avctx->frame_size=320;
 604     avctx->coded_frame= avcodec_alloc_frame();
 605
 606     s->state = E_IF_init();
 607     s->allow_dtx=0;
 608
 609     return 0;
 610 }
 611
 612 static int amr_wb_encode_close(AVCodecContext * avctx)
 613 {
 614     AMRWBContext *s = avctx->priv_data;
 615
 616     E_IF_exit(s->state);
 617     av_freep(&avctx->coded_frame);
 618     s->frameCount++;
 619     return 0;
 620 }
 621
 622 static int amr_wb_encode_frame(AVCodecContext *avctx,
 623                             unsigned char *frame/*out*/, int buf_size, void *data/*in*/)
 624 {
 625     AMRWBContext *s = avctx->priv_data;
 626     int size;
 627
 628     if((s->mode=getWBBitrateMode(avctx->bit_rate))<0)
 629     {
 630         av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported);
 631         return -1;
 632     }
 633     size = E_IF_encode(s->state, s->mode, data, frame, s->allow_dtx);
 634     return size;
 635 }
 636
 637 static int amr_wb_decode_init(AVCodecContext * avctx)
 638 {
 639     AMRWBContext *s = avctx->priv_data;
 640
 641     s->frameCount=0;
 642     s->state = D_IF_init();
 643
 644     amr_decode_fix_avctx(avctx);
 645
 646     if(avctx->channels > 1)
 647     {
 648         av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n");
 649         return -1;
 650     }
 651
 652     return 0;
 653 }
 654
 655 static int amr_wb_decode_frame(AVCodecContext * avctx,
 656             void *data, int *data_size,
 657             const uint8_t * buf, int buf_size)
 658 {
 659     AMRWBContext *s = avctx->priv_data;
 660     const uint8_t*amrData=buf;
 661     int mode;
 662     int packet_size;
 663     static const uint8_t block_size[16] = {18, 23, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1};
 664
 665     if(buf_size==0) {
 666         /* nothing to do */
 667         return 0;
 668     }
 669
 670     mode = (amrData[0] >> 3) & 0x000F;
 671     packet_size = block_size[mode];
 672
 673     if(packet_size > buf_size) {
 674         av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", buf_size, packet_size+1);
 675         return -1;
 676     }
 677
 678     s->frameCount++;
 679     D_IF_decode( s->state, amrData, data, _good_frame);
 680     *data_size=320*2;
 681     return packet_size;
 682 }
 683
 684 static int amr_wb_decode_close(AVCodecContext * avctx)
 685 {
 686     AMRWBContext *s = avctx->priv_data;
 687
 688     D_IF_exit(s->state);
 689     return 0;
 690 }
 691
 692 AVCodec libamr_wb_decoder =
 693 {
 694     "libamr_wb",
 695     CODEC_TYPE_AUDIO,
 696     CODEC_ID_AMR_WB,
 697     sizeof(AMRWBContext),
 698     amr_wb_decode_init,
 699     NULL,
 700     amr_wb_decode_close,
 701     amr_wb_decode_frame,
 702     .long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"),
 703 };
 704
 705 AVCodec libamr_wb_encoder =
 706 {
 707     "libamr_wb",
 708     CODEC_TYPE_AUDIO,
 709     CODEC_ID_AMR_WB,
 710     sizeof(AMRWBContext),
 711     amr_wb_encode_init,
 712     amr_wb_encode_frame,
 713     amr_wb_encode_close,
 714     NULL,
 715     .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
 716     .long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"),
 717 };
 718
 719 #endif //CONFIG_LIBAMR_WB