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#include "libavutil/avstring.h" 23#include "libavutil/channel_layout.h" 24#include "libavutil/common.h" 25#include "libavutil/opt.h" 26#include "avcodec.h" 27#include "audio_frame_queue.h" 28#include "internal.h" 29 30static int amr_decode_fix_avctx(AVCodecContext *avctx) 31{ 32 const int is_amr_wb = 1 + (avctx->codec_id == AV_CODEC_ID_AMR_WB); 33 34 if (!avctx->sample_rate) 35 avctx->sample_rate = 8000 * is_amr_wb; 36 37 if (avctx->channels > 1) { 38 avpriv_report_missing_feature(avctx, "multi-channel AMR"); 39 return AVERROR_PATCHWELCOME; 40 } 41 42 avctx->channels = 1; 43 avctx->channel_layout = AV_CH_LAYOUT_MONO; 44 avctx->sample_fmt = AV_SAMPLE_FMT_S16; 45 return 0; 46} 47 48#if CONFIG_LIBOPENCORE_AMRNB 49 50#include <opencore-amrnb/interf_dec.h> 51#include <opencore-amrnb/interf_enc.h> 52 53typedef struct AMRContext { 54 AVClass *av_class; 55 void *dec_state; 56 void *enc_state; 57 int enc_bitrate; 58 int enc_mode; 59 int enc_dtx; 60 int enc_last_frame; 61 AudioFrameQueue afq; 62} AMRContext; 63 64#if CONFIG_LIBOPENCORE_AMRNB_DECODER 65static av_cold int amr_nb_decode_init(AVCodecContext *avctx) 66{ 67 AMRContext *s = avctx->priv_data; 68 int ret; 69 70 if ((ret = amr_decode_fix_avctx(avctx)) < 0) 71 return ret; 72 73 s->dec_state = Decoder_Interface_init(); 74 if (!s->dec_state) { 75 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n"); 76 return -1; 77 } 78 79 return 0; 80} 81 82static av_cold int amr_nb_decode_close(AVCodecContext *avctx) 83{ 84 AMRContext *s = avctx->priv_data; 85 86 Decoder_Interface_exit(s->dec_state); 87 88 return 0; 89} 90 91static int amr_nb_decode_frame(AVCodecContext *avctx, void *data, 92 int *got_frame_ptr, AVPacket *avpkt) 93{ 94 AVFrame *frame = data; 95 const uint8_t *buf = avpkt->data; 96 int buf_size = avpkt->size; 97 AMRContext *s = avctx->priv_data; 98 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 }; 99 enum Mode dec_mode; 100 int packet_size, ret; 101 102 av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n", 103 buf, buf_size, avctx->frame_number); 104 105 /* get output buffer */ 106 frame->nb_samples = 160; 107 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) 108 return ret; 109 110 dec_mode = (buf[0] >> 3) & 0x000F; 111 packet_size = block_size[dec_mode] + 1; 112 113 if (packet_size > buf_size) { 114 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", 115 buf_size, packet_size); 116 return AVERROR_INVALIDDATA; 117 } 118 119 av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n", 120 packet_size, buf[0], buf[1], buf[2], buf[3]); 121 /* call decoder */ 122 Decoder_Interface_Decode(s->dec_state, buf, (short *)frame->data[0], 0); 123 124 *got_frame_ptr = 1; 125 126 return packet_size; 127} 128 129AVCodec ff_libopencore_amrnb_decoder = { 130 .name = "libopencore_amrnb", 131 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"), 132 .type = AVMEDIA_TYPE_AUDIO, 133 .id = AV_CODEC_ID_AMR_NB, 134 .priv_data_size = sizeof(AMRContext), 135 .init = amr_nb_decode_init, 136 .close = amr_nb_decode_close, 137 .decode = amr_nb_decode_frame, 138 .capabilities = CODEC_CAP_DR1, 139}; 140#endif /* CONFIG_LIBOPENCORE_AMRNB_DECODER */ 141 142#if CONFIG_LIBOPENCORE_AMRNB_ENCODER 143/* Common code for fixed and float version*/ 144typedef struct AMR_bitrates { 145 int rate; 146 enum Mode mode; 147} AMR_bitrates; 148 149/* Match desired bitrate */ 150static int get_bitrate_mode(int bitrate, void *log_ctx) 151{ 152 /* make the correspondance between bitrate and mode */ 153 static const AMR_bitrates rates[] = { 154 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 }, 155 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 } 156 }; 157 int i, best = -1, min_diff = 0; 158 char log_buf[200]; 159 160 for (i = 0; i < 8; i++) { 161 if (rates[i].rate == bitrate) 162 return rates[i].mode; 163 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) { 164 best = i; 165 min_diff = abs(rates[i].rate - bitrate); 166 } 167 } 168 /* no bitrate matching exactly, log a warning */ 169 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of "); 170 for (i = 0; i < 8; i++) 171 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f); 172 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f); 173 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf); 174 175 return best; 176} 177 178static const AVOption options[] = { 179 { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRContext, enc_dtx), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM }, 180 { NULL } 181}; 182 183static const AVClass amrnb_class = { 184 "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT 185}; 186 187static av_cold int amr_nb_encode_init(AVCodecContext *avctx) 188{ 189 AMRContext *s = avctx->priv_data; 190 191 if (avctx->sample_rate != 8000 && avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) { 192 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); 193 return AVERROR(ENOSYS); 194 } 195 196 if (avctx->channels != 1) { 197 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); 198 return AVERROR(ENOSYS); 199 } 200 201 avctx->frame_size = 160; 202 avctx->delay = 50; 203 ff_af_queue_init(avctx, &s->afq); 204 205 s->enc_state = Encoder_Interface_init(s->enc_dtx); 206 if (!s->enc_state) { 207 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n"); 208 return -1; 209 } 210 211 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx); 212 s->enc_bitrate = avctx->bit_rate; 213 214 return 0; 215} 216 217static av_cold int amr_nb_encode_close(AVCodecContext *avctx) 218{ 219 AMRContext *s = avctx->priv_data; 220 221 Encoder_Interface_exit(s->enc_state); 222 ff_af_queue_close(&s->afq); 223 return 0; 224} 225 226static int amr_nb_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, 227 const AVFrame *frame, int *got_packet_ptr) 228{ 229 AMRContext *s = avctx->priv_data; 230 int written, ret; 231 int16_t *flush_buf = NULL; 232 const int16_t *samples = frame ? (const int16_t *)frame->data[0] : NULL; 233 234 if (s->enc_bitrate != avctx->bit_rate) { 235 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx); 236 s->enc_bitrate = avctx->bit_rate; 237 } 238 239 if ((ret = ff_alloc_packet2(avctx, avpkt, 32)) < 0) 240 return ret; 241 242 if (frame) { 243 if (frame->nb_samples < avctx->frame_size) { 244 flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf)); 245 if (!flush_buf) 246 return AVERROR(ENOMEM); 247 memcpy(flush_buf, samples, frame->nb_samples * sizeof(*flush_buf)); 248 samples = flush_buf; 249 if (frame->nb_samples < avctx->frame_size - avctx->delay) 250 s->enc_last_frame = -1; 251 } 252 if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) { 253 av_freep(&flush_buf); 254 return ret; 255 } 256 } else { 257 if (s->enc_last_frame < 0) 258 return 0; 259 flush_buf = av_mallocz_array(avctx->frame_size, sizeof(*flush_buf)); 260 if (!flush_buf) 261 return AVERROR(ENOMEM); 262 samples = flush_buf; 263 s->enc_last_frame = -1; 264 } 265 266 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, samples, 267 avpkt->data, 0); 268 av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n", 269 written, s->enc_mode, avpkt->data[0]); 270 271 /* Get the next frame pts/duration */ 272 ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts, 273 &avpkt->duration); 274 275 avpkt->size = written; 276 *got_packet_ptr = 1; 277 av_freep(&flush_buf); 278 return 0; 279} 280 281AVCodec ff_libopencore_amrnb_encoder = { 282 .name = "libopencore_amrnb", 283 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-NB (Adaptive Multi-Rate Narrow-Band)"), 284 .type = AVMEDIA_TYPE_AUDIO, 285 .id = AV_CODEC_ID_AMR_NB, 286 .priv_data_size = sizeof(AMRContext), 287 .init = amr_nb_encode_init, 288 .encode2 = amr_nb_encode_frame, 289 .close = amr_nb_encode_close, 290 .capabilities = CODEC_CAP_DELAY | CODEC_CAP_SMALL_LAST_FRAME, 291 .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, 292 AV_SAMPLE_FMT_NONE }, 293 .priv_class = &amrnb_class, 294}; 295#endif /* CONFIG_LIBOPENCORE_AMRNB_ENCODER */ 296 297#endif /* CONFIG_LIBOPENCORE_AMRNB */ 298 299/* -----------AMR wideband ------------*/ 300#if CONFIG_LIBOPENCORE_AMRWB_DECODER 301 302#include <opencore-amrwb/dec_if.h> 303#include <opencore-amrwb/if_rom.h> 304 305typedef struct AMRWBContext { 306 void *state; 307} AMRWBContext; 308 309static av_cold int amr_wb_decode_init(AVCodecContext *avctx) 310{ 311 AMRWBContext *s = avctx->priv_data; 312 int ret; 313 314 if ((ret = amr_decode_fix_avctx(avctx)) < 0) 315 return ret; 316 317 s->state = D_IF_init(); 318 319 return 0; 320} 321 322static int amr_wb_decode_frame(AVCodecContext *avctx, void *data, 323 int *got_frame_ptr, AVPacket *avpkt) 324{ 325 AVFrame *frame = data; 326 const uint8_t *buf = avpkt->data; 327 int buf_size = avpkt->size; 328 AMRWBContext *s = avctx->priv_data; 329 int mode, ret; 330 int packet_size; 331 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1}; 332 333 /* get output buffer */ 334 frame->nb_samples = 320; 335 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) 336 return ret; 337 338 mode = (buf[0] >> 3) & 0x000F; 339 packet_size = block_size[mode]; 340 341 if (packet_size > buf_size) { 342 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", 343 buf_size, packet_size + 1); 344 return AVERROR_INVALIDDATA; 345 } 346 if (!packet_size) { 347 av_log(avctx, AV_LOG_ERROR, "amr packet_size invalid\n"); 348 return AVERROR_INVALIDDATA; 349 } 350 351 D_IF_decode(s->state, buf, (short *)frame->data[0], _good_frame); 352 353 *got_frame_ptr = 1; 354 355 return packet_size; 356} 357 358static int amr_wb_decode_close(AVCodecContext *avctx) 359{ 360 AMRWBContext *s = avctx->priv_data; 361 362 D_IF_exit(s->state); 363 return 0; 364} 365 366AVCodec ff_libopencore_amrwb_decoder = { 367 .name = "libopencore_amrwb", 368 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE AMR-WB (Adaptive Multi-Rate Wide-Band)"), 369 .type = AVMEDIA_TYPE_AUDIO, 370 .id = AV_CODEC_ID_AMR_WB, 371 .priv_data_size = sizeof(AMRWBContext), 372 .init = amr_wb_decode_init, 373 .close = amr_wb_decode_close, 374 .decode = amr_wb_decode_frame, 375 .capabilities = CODEC_CAP_DR1, 376}; 377 378#endif /* CONFIG_LIBOPENCORE_AMRWB_DECODER */ 379