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. 29 * 30 * \section AMR-NB 31 * 32 * The float version (default) can be downloaded from: 33 * http://www.3gpp.org/ftp/Specs/archive/26_series/26.104/26104-610.zip 34 * 35 * \subsection Specification 36 * The specification for AMR-NB can be found in TS 26.071 37 * (http://www.3gpp.org/ftp/Specs/html-info/26071.htm) and some other 38 * info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm. 39 * 40 * \section AMR-WB 41 * 42 * The reference code can be downloaded from: 43 * http://www.3gpp.org/ftp/Specs/archive/26_series/26.204/26204-600.zip 44 * 45 * \subsection Specification 46 * The specification for AMR-WB can be found in TS 26.171 47 * (http://www.3gpp.org/ftp/Specs/html-info/26171.htm) and some other 48 * info at http://www.3gpp.org/ftp/Specs/html-info/26-series.htm. 49 * 50 */ 51 52#include "avcodec.h" 53 54static void amr_decode_fix_avctx(AVCodecContext *avctx) 55{ 56 const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB); 57 58 if (!avctx->sample_rate) 59 avctx->sample_rate = 8000 * is_amr_wb; 60 61 if (!avctx->channels) 62 avctx->channels = 1; 63 64 avctx->frame_size = 160 * is_amr_wb; 65 avctx->sample_fmt = SAMPLE_FMT_S16; 66} 67 68#if CONFIG_LIBAMR_NB 69 70#include <amrnb/interf_dec.h> 71#include <amrnb/interf_enc.h> 72 73static const char nb_bitrate_unsupported[] = 74 "bitrate not supported: use one of 4.75k, 5.15k, 5.9k, 6.7k, 7.4k, 7.95k, 10.2k or 12.2k\n"; 75 76typedef struct AMR_bitrates { 77 int rate; 78 enum Mode mode; 79} AMR_bitrates; 80 81/* Match desired bitrate */ 82static int getBitrateMode(int bitrate) 83{ 84 /* make the correspondance between bitrate and mode */ 85 AMR_bitrates rates[] = { { 4750, MR475}, 86 { 5150, MR515}, 87 { 5900, MR59}, 88 { 6700, MR67}, 89 { 7400, MR74}, 90 { 7950, MR795}, 91 {10200, MR102}, 92 {12200, MR122}, }; 93 int i; 94 95 for (i = 0; i < 8; i++) 96 if (rates[i].rate == bitrate) 97 return rates[i].mode; 98 /* no bitrate matching, return an error */ 99 return -1; 100} 101 102typedef struct AMRContext { 103 int frameCount; 104 void *decState; 105 int *enstate; 106 int enc_bitrate; 107} AMRContext; 108 109static av_cold int amr_nb_decode_init(AVCodecContext *avctx) 110{ 111 AMRContext *s = avctx->priv_data; 112 113 s->frameCount = 0; 114 s->decState = Decoder_Interface_init(); 115 if (!s->decState) { 116 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\r\n"); 117 return -1; 118 } 119 120 amr_decode_fix_avctx(avctx); 121 122 if (avctx->channels > 1) { 123 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n"); 124 return -1; 125 } 126 127 return 0; 128} 129 130static av_cold int amr_nb_decode_close(AVCodecContext *avctx) 131{ 132 AMRContext *s = avctx->priv_data; 133 134 Decoder_Interface_exit(s->decState); 135 return 0; 136} 137 138static int amr_nb_decode_frame(AVCodecContext *avctx, void *data, 139 int *data_size, 140 const uint8_t *buf, int buf_size) 141{ 142 AMRContext *s = avctx->priv_data; 143 const uint8_t *amrData = buf; 144 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 }; 145 enum Mode dec_mode; 146 int packet_size; 147 148 /* av_log(NULL, AV_LOG_DEBUG, "amr_decode_frame buf=%p buf_size=%d frameCount=%d!!\n", 149 buf, buf_size, s->frameCount); */ 150 151 dec_mode = (buf[0] >> 3) & 0x000F; 152 packet_size = block_size[dec_mode] + 1; 153 154 if (packet_size > buf_size) { 155 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", 156 buf_size, packet_size); 157 return -1; 158 } 159 160 s->frameCount++; 161 /* av_log(NULL, AV_LOG_DEBUG, "packet_size=%d amrData= 0x%X %X %X %X\n", 162 packet_size, amrData[0], amrData[1], amrData[2], amrData[3]); */ 163 /* call decoder */ 164 Decoder_Interface_Decode(s->decState, amrData, data, 0); 165 *data_size = 160 * 2; 166 167 return packet_size; 168} 169 170AVCodec libamr_nb_decoder = { 171 "libamr_nb", 172 CODEC_TYPE_AUDIO, 173 CODEC_ID_AMR_NB, 174 sizeof(AMRContext), 175 amr_nb_decode_init, 176 NULL, 177 amr_nb_decode_close, 178 amr_nb_decode_frame, 179 .long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"), 180}; 181 182static av_cold int amr_nb_encode_init(AVCodecContext *avctx) 183{ 184 AMRContext *s = avctx->priv_data; 185 186 s->frameCount = 0; 187 188 if (avctx->sample_rate != 8000) { 189 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); 190 return -1; 191 } 192 193 if (avctx->channels != 1) { 194 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); 195 return -1; 196 } 197 198 avctx->frame_size = 160; 199 avctx->coded_frame = avcodec_alloc_frame(); 200 201 s->enstate=Encoder_Interface_init(0); 202 if (!s->enstate) { 203 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n"); 204 return -1; 205 } 206 207 if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) { 208 av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported); 209 return -1; 210 } 211 212 return 0; 213} 214 215static av_cold int amr_nb_encode_close(AVCodecContext *avctx) 216{ 217 AMRContext *s = avctx->priv_data; 218 219 Encoder_Interface_exit(s->enstate); 220 av_freep(&avctx->coded_frame); 221 return 0; 222} 223 224static int amr_nb_encode_frame(AVCodecContext *avctx, 225 unsigned char *frame/*out*/, 226 int buf_size, void *data/*in*/) 227{ 228 AMRContext *s = avctx->priv_data; 229 int written; 230 231 if ((s->enc_bitrate = getBitrateMode(avctx->bit_rate)) < 0) { 232 av_log(avctx, AV_LOG_ERROR, nb_bitrate_unsupported); 233 return -1; 234 } 235 236 written = Encoder_Interface_Encode(s->enstate, s->enc_bitrate, data, 237 frame, 0); 238 /* av_log(NULL, AV_LOG_DEBUG, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n", 239 written, s->enc_bitrate, frame[0] ); */ 240 241 return written; 242} 243 244AVCodec libamr_nb_encoder = { 245 "libamr_nb", 246 CODEC_TYPE_AUDIO, 247 CODEC_ID_AMR_NB, 248 sizeof(AMRContext), 249 amr_nb_encode_init, 250 amr_nb_encode_frame, 251 amr_nb_encode_close, 252 NULL, 253 .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, 254 .long_name = NULL_IF_CONFIG_SMALL("libamr-nb Adaptive Multi-Rate (AMR) Narrow-Band"), 255}; 256 257#endif 258 259/* -----------AMR wideband ------------*/ 260#if CONFIG_LIBAMR_WB 261 262#ifdef _TYPEDEF_H 263//To avoid duplicate typedefs from typedef in amr-nb 264#define typedef_h 265#endif 266 267#include <amrwb/dec_if.h> 268#include <amrwb/if_rom.h> 269 270static const char wb_bitrate_unsupported[] = 271 "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"; 272 273typedef struct AMRWB_bitrates { 274 int rate; 275 int mode; 276} AMRWB_bitrates; 277 278typedef struct AMRWBContext { 279 int frameCount; 280 void *state; 281 int mode; 282 Word16 allow_dtx; 283} AMRWBContext; 284 285#if CONFIG_LIBAMR_WB_ENCODER 286 287#include <amrwb/enc_if.h> 288 289static int getWBBitrateMode(int bitrate) 290{ 291 /* make the correspondance between bitrate and mode */ 292 AMRWB_bitrates rates[] = { { 6600, 0}, 293 { 8850, 1}, 294 {12650, 2}, 295 {14250, 3}, 296 {15850, 4}, 297 {18250, 5}, 298 {19850, 6}, 299 {23050, 7}, 300 {23850, 8}, }; 301 int i; 302 303 for (i = 0; i < 9; i++) 304 if (rates[i].rate == bitrate) 305 return rates[i].mode; 306 /* no bitrate matching, return an error */ 307 return -1; 308} 309 310static av_cold int amr_wb_encode_init(AVCodecContext *avctx) 311{ 312 AMRWBContext *s = avctx->priv_data; 313 314 s->frameCount = 0; 315 316 if (avctx->sample_rate != 16000) { 317 av_log(avctx, AV_LOG_ERROR, "Only 16000Hz sample rate supported\n"); 318 return -1; 319 } 320 321 if (avctx->channels != 1) { 322 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); 323 return -1; 324 } 325 326 if ((s->mode = getWBBitrateMode(avctx->bit_rate)) < 0) { 327 av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported); 328 return -1; 329 } 330 331 avctx->frame_size = 320; 332 avctx->coded_frame = avcodec_alloc_frame(); 333 334 s->state = E_IF_init(); 335 s->allow_dtx = 0; 336 337 return 0; 338} 339 340static int amr_wb_encode_close(AVCodecContext *avctx) 341{ 342 AMRWBContext *s = avctx->priv_data; 343 344 E_IF_exit(s->state); 345 av_freep(&avctx->coded_frame); 346 s->frameCount++; 347 return 0; 348} 349 350static int amr_wb_encode_frame(AVCodecContext *avctx, 351 unsigned char *frame/*out*/, 352 int buf_size, void *data/*in*/) 353{ 354 AMRWBContext *s = avctx->priv_data; 355 int size; 356 357 if ((s->mode = getWBBitrateMode(avctx->bit_rate)) < 0) { 358 av_log(avctx, AV_LOG_ERROR, wb_bitrate_unsupported); 359 return -1; 360 } 361 size = E_IF_encode(s->state, s->mode, data, frame, s->allow_dtx); 362 return size; 363} 364 365AVCodec libamr_wb_encoder = { 366 "libamr_wb", 367 CODEC_TYPE_AUDIO, 368 CODEC_ID_AMR_WB, 369 sizeof(AMRWBContext), 370 amr_wb_encode_init, 371 amr_wb_encode_frame, 372 amr_wb_encode_close, 373 NULL, 374 .sample_fmts = (enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, 375 .long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"), 376}; 377 378#endif 379 380static av_cold int amr_wb_decode_init(AVCodecContext *avctx) 381{ 382 AMRWBContext *s = avctx->priv_data; 383 384 s->frameCount = 0; 385 s->state = D_IF_init(); 386 387 amr_decode_fix_avctx(avctx); 388 389 if (avctx->channels > 1) { 390 av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n"); 391 return -1; 392 } 393 394 return 0; 395} 396 397static int amr_wb_decode_frame(AVCodecContext *avctx, 398 void *data, int *data_size, 399 const uint8_t *buf, int buf_size) 400{ 401 AMRWBContext *s = avctx->priv_data; 402 const uint8_t *amrData = buf; 403 int mode; 404 int packet_size; 405 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1}; 406 407 if (!buf_size) 408 /* nothing to do */ 409 return 0; 410 411 mode = (amrData[0] >> 3) & 0x000F; 412 packet_size = block_size[mode]; 413 414 if (packet_size > buf_size) { 415 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", 416 buf_size, packet_size + 1); 417 return -1; 418 } 419 420 s->frameCount++; 421 D_IF_decode(s->state, amrData, data, _good_frame); 422 *data_size = 320 * 2; 423 return packet_size; 424} 425 426static int amr_wb_decode_close(AVCodecContext *avctx) 427{ 428 AMRWBContext *s = avctx->priv_data; 429 430 D_IF_exit(s->state); 431 return 0; 432} 433 434AVCodec libamr_wb_decoder = { 435 "libamr_wb", 436 CODEC_TYPE_AUDIO, 437 CODEC_ID_AMR_WB, 438 sizeof(AMRWBContext), 439 amr_wb_decode_init, 440 NULL, 441 amr_wb_decode_close, 442 amr_wb_decode_frame, 443 .long_name = NULL_IF_CONFIG_SMALL("libamr-wb Adaptive Multi-Rate (AMR) Wide-Band"), 444}; 445 446#endif //CONFIG_LIBAMR_WB 447