1/* 2 * AMR Audio decoder stub 3 * Copyright (c) 2003 the ffmpeg project 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "avcodec.h" 23#include "libavutil/avstring.h" 24#include "libavutil/opt.h" 25 26static void amr_decode_fix_avctx(AVCodecContext *avctx) 27{ 28 const int is_amr_wb = 1 + (avctx->codec_id == CODEC_ID_AMR_WB); 29 30 if (!avctx->sample_rate) 31 avctx->sample_rate = 8000 * is_amr_wb; 32 33 if (!avctx->channels) 34 avctx->channels = 1; 35 36 avctx->frame_size = 160 * is_amr_wb; 37 avctx->sample_fmt = AV_SAMPLE_FMT_S16; 38} 39 40#if CONFIG_LIBOPENCORE_AMRNB 41 42#include <opencore-amrnb/interf_dec.h> 43#include <opencore-amrnb/interf_enc.h> 44 45/* Common code for fixed and float version*/ 46typedef struct AMR_bitrates { 47 int rate; 48 enum Mode mode; 49} AMR_bitrates; 50 51/* Match desired bitrate */ 52static int get_bitrate_mode(int bitrate, void *log_ctx) 53{ 54 /* make the correspondance between bitrate and mode */ 55 static const AMR_bitrates rates[] = { 56 { 4750, MR475 }, { 5150, MR515 }, { 5900, MR59 }, { 6700, MR67 }, 57 { 7400, MR74 }, { 7950, MR795 }, { 10200, MR102 }, { 12200, MR122 } 58 }; 59 int i, best = -1, min_diff = 0; 60 char log_buf[200]; 61 62 for (i = 0; i < 8; i++) { 63 if (rates[i].rate == bitrate) 64 return rates[i].mode; 65 if (best < 0 || abs(rates[i].rate - bitrate) < min_diff) { 66 best = i; 67 min_diff = abs(rates[i].rate - bitrate); 68 } 69 } 70 /* no bitrate matching exactly, log a warning */ 71 snprintf(log_buf, sizeof(log_buf), "bitrate not supported: use one of "); 72 for (i = 0; i < 8; i++) 73 av_strlcatf(log_buf, sizeof(log_buf), "%.2fk, ", rates[i].rate / 1000.f); 74 av_strlcatf(log_buf, sizeof(log_buf), "using %.2fk", rates[best].rate / 1000.f); 75 av_log(log_ctx, AV_LOG_WARNING, "%s\n", log_buf); 76 77 return best; 78} 79 80typedef struct AMRContext { 81 AVClass *av_class; 82 AVFrame frame; 83 void *dec_state; 84 void *enc_state; 85 int enc_bitrate; 86 int enc_mode; 87 int enc_dtx; 88} AMRContext; 89 90static const AVOption options[] = { 91 { "dtx", "Allow DTX (generate comfort noise)", offsetof(AMRContext, enc_dtx), AV_OPT_TYPE_INT, { 0 }, 0, 1, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM }, 92 { NULL } 93}; 94 95static const AVClass class = { 96 "libopencore_amrnb", av_default_item_name, options, LIBAVUTIL_VERSION_INT 97}; 98 99static av_cold int amr_nb_decode_init(AVCodecContext *avctx) 100{ 101 AMRContext *s = avctx->priv_data; 102 103 s->dec_state = Decoder_Interface_init(); 104 if (!s->dec_state) { 105 av_log(avctx, AV_LOG_ERROR, "Decoder_Interface_init error\n"); 106 return -1; 107 } 108 109 amr_decode_fix_avctx(avctx); 110 111 if (avctx->channels > 1) { 112 av_log(avctx, AV_LOG_ERROR, "amr_nb: multichannel decoding not supported\n"); 113 return AVERROR(ENOSYS); 114 } 115 116 avcodec_get_frame_defaults(&s->frame); 117 avctx->coded_frame = &s->frame; 118 119 return 0; 120} 121 122static av_cold int amr_nb_decode_close(AVCodecContext *avctx) 123{ 124 AMRContext *s = avctx->priv_data; 125 126 Decoder_Interface_exit(s->dec_state); 127 128 return 0; 129} 130 131static int amr_nb_decode_frame(AVCodecContext *avctx, void *data, 132 int *got_frame_ptr, AVPacket *avpkt) 133{ 134 const uint8_t *buf = avpkt->data; 135 int buf_size = avpkt->size; 136 AMRContext *s = avctx->priv_data; 137 static const uint8_t block_size[16] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 }; 138 enum Mode dec_mode; 139 int packet_size, ret; 140 141 av_dlog(avctx, "amr_decode_frame buf=%p buf_size=%d frame_count=%d!!\n", 142 buf, buf_size, avctx->frame_number); 143 144 /* get output buffer */ 145 s->frame.nb_samples = 160; 146 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) { 147 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 148 return ret; 149 } 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 AVERROR_INVALIDDATA; 158 } 159 160 av_dlog(avctx, "packet_size=%d buf= 0x%X %X %X %X\n", 161 packet_size, buf[0], buf[1], buf[2], buf[3]); 162 /* call decoder */ 163 Decoder_Interface_Decode(s->dec_state, buf, (short *)s->frame.data[0], 0); 164 165 *got_frame_ptr = 1; 166 *(AVFrame *)data = s->frame; 167 168 return packet_size; 169} 170 171AVCodec ff_libopencore_amrnb_decoder = { 172 .name = "libopencore_amrnb", 173 .type = AVMEDIA_TYPE_AUDIO, 174 .id = CODEC_ID_AMR_NB, 175 .priv_data_size = sizeof(AMRContext), 176 .init = amr_nb_decode_init, 177 .close = amr_nb_decode_close, 178 .decode = amr_nb_decode_frame, 179 .capabilities = CODEC_CAP_DR1, 180 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"), 181}; 182 183static av_cold int amr_nb_encode_init(AVCodecContext *avctx) 184{ 185 AMRContext *s = avctx->priv_data; 186 187 if (avctx->sample_rate != 8000) { 188 av_log(avctx, AV_LOG_ERROR, "Only 8000Hz sample rate supported\n"); 189 return AVERROR(ENOSYS); 190 } 191 192 if (avctx->channels != 1) { 193 av_log(avctx, AV_LOG_ERROR, "Only mono supported\n"); 194 return AVERROR(ENOSYS); 195 } 196 197 avctx->frame_size = 160; 198 avctx->coded_frame = avcodec_alloc_frame(); 199 200 s->enc_state = Encoder_Interface_init(s->enc_dtx); 201 if (!s->enc_state) { 202 av_log(avctx, AV_LOG_ERROR, "Encoder_Interface_init error\n"); 203 return -1; 204 } 205 206 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx); 207 s->enc_bitrate = avctx->bit_rate; 208 209 return 0; 210} 211 212static av_cold int amr_nb_encode_close(AVCodecContext *avctx) 213{ 214 AMRContext *s = avctx->priv_data; 215 216 Encoder_Interface_exit(s->enc_state); 217 av_freep(&avctx->coded_frame); 218 return 0; 219} 220 221static int amr_nb_encode_frame(AVCodecContext *avctx, 222 unsigned char *frame/*out*/, 223 int buf_size, void *data/*in*/) 224{ 225 AMRContext *s = avctx->priv_data; 226 int written; 227 228 if (s->enc_bitrate != avctx->bit_rate) { 229 s->enc_mode = get_bitrate_mode(avctx->bit_rate, avctx); 230 s->enc_bitrate = avctx->bit_rate; 231 } 232 233 written = Encoder_Interface_Encode(s->enc_state, s->enc_mode, data, 234 frame, 0); 235 av_dlog(avctx, "amr_nb_encode_frame encoded %u bytes, bitrate %u, first byte was %#02x\n", 236 written, s->enc_mode, frame[0]); 237 238 return written; 239} 240 241AVCodec ff_libopencore_amrnb_encoder = { 242 .name = "libopencore_amrnb", 243 .type = AVMEDIA_TYPE_AUDIO, 244 .id = CODEC_ID_AMR_NB, 245 .priv_data_size = sizeof(AMRContext), 246 .init = amr_nb_encode_init, 247 .encode = amr_nb_encode_frame, 248 .close = amr_nb_encode_close, 249 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE}, 250 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Narrow-Band"), 251 .priv_class = &class, 252}; 253 254#endif 255 256/* -----------AMR wideband ------------*/ 257#if CONFIG_LIBOPENCORE_AMRWB 258 259#include <opencore-amrwb/dec_if.h> 260#include <opencore-amrwb/if_rom.h> 261 262typedef struct AMRWBContext { 263 AVFrame frame; 264 void *state; 265} AMRWBContext; 266 267static av_cold int amr_wb_decode_init(AVCodecContext *avctx) 268{ 269 AMRWBContext *s = avctx->priv_data; 270 271 s->state = D_IF_init(); 272 273 amr_decode_fix_avctx(avctx); 274 275 if (avctx->channels > 1) { 276 av_log(avctx, AV_LOG_ERROR, "amr_wb: multichannel decoding not supported\n"); 277 return AVERROR(ENOSYS); 278 } 279 280 avcodec_get_frame_defaults(&s->frame); 281 avctx->coded_frame = &s->frame; 282 283 return 0; 284} 285 286static int amr_wb_decode_frame(AVCodecContext *avctx, void *data, 287 int *got_frame_ptr, AVPacket *avpkt) 288{ 289 const uint8_t *buf = avpkt->data; 290 int buf_size = avpkt->size; 291 AMRWBContext *s = avctx->priv_data; 292 int mode, ret; 293 int packet_size; 294 static const uint8_t block_size[16] = {18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 6, 0, 0, 0, 1, 1}; 295 296 /* get output buffer */ 297 s->frame.nb_samples = 320; 298 if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) { 299 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 300 return ret; 301 } 302 303 mode = (buf[0] >> 3) & 0x000F; 304 packet_size = block_size[mode]; 305 306 if (packet_size > buf_size) { 307 av_log(avctx, AV_LOG_ERROR, "amr frame too short (%u, should be %u)\n", 308 buf_size, packet_size + 1); 309 return AVERROR_INVALIDDATA; 310 } 311 312 D_IF_decode(s->state, buf, (short *)s->frame.data[0], _good_frame); 313 314 *got_frame_ptr = 1; 315 *(AVFrame *)data = s->frame; 316 317 return packet_size; 318} 319 320static int amr_wb_decode_close(AVCodecContext *avctx) 321{ 322 AMRWBContext *s = avctx->priv_data; 323 324 D_IF_exit(s->state); 325 return 0; 326} 327 328AVCodec ff_libopencore_amrwb_decoder = { 329 .name = "libopencore_amrwb", 330 .type = AVMEDIA_TYPE_AUDIO, 331 .id = CODEC_ID_AMR_WB, 332 .priv_data_size = sizeof(AMRWBContext), 333 .init = amr_wb_decode_init, 334 .close = amr_wb_decode_close, 335 .decode = amr_wb_decode_frame, 336 .capabilities = CODEC_CAP_DR1, 337 .long_name = NULL_IF_CONFIG_SMALL("OpenCORE Adaptive Multi-Rate (AMR) Wide-Band"), 338}; 339 340#endif /* CONFIG_LIBOPENCORE_AMRWB */ 341