1/* 2 * WMA compatible encoder 3 * Copyright (c) 2007 Michael Niedermayer 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 "avcodec.h" 23#include "wma.h" 24 25#undef NDEBUG 26#include <assert.h> 27 28 29static int encode_init(AVCodecContext * avctx){ 30 WMACodecContext *s = avctx->priv_data; 31 int i, flags1, flags2; 32 uint8_t *extradata; 33 34 s->avctx = avctx; 35 36 if(avctx->channels > MAX_CHANNELS) 37 return -1; 38 39 if(avctx->bit_rate < 24*1000) 40 return -1; 41 42 /* extract flag infos */ 43 flags1 = 0; 44 flags2 = 1; 45 if (avctx->codec->id == CODEC_ID_WMAV1) { 46 extradata= av_malloc(4); 47 avctx->extradata_size= 4; 48 AV_WL16(extradata, flags1); 49 AV_WL16(extradata+2, flags2); 50 } else if (avctx->codec->id == CODEC_ID_WMAV2) { 51 extradata= av_mallocz(10); 52 avctx->extradata_size= 10; 53 AV_WL32(extradata, flags1); 54 AV_WL16(extradata+4, flags2); 55 }else 56 assert(0); 57 avctx->extradata= extradata; 58 s->use_exp_vlc = flags2 & 0x0001; 59 s->use_bit_reservoir = flags2 & 0x0002; 60 s->use_variable_block_len = flags2 & 0x0004; 61 62 ff_wma_init(avctx, flags2); 63 64 /* init MDCT */ 65 for(i = 0; i < s->nb_block_sizes; i++) 66 ff_mdct_init(&s->mdct_ctx[i], s->frame_len_bits - i + 1, 0, 1.0); 67 68 avctx->block_align= 69 s->block_align= avctx->bit_rate*(int64_t)s->frame_len / (avctx->sample_rate*8); 70//av_log(NULL, AV_LOG_ERROR, "%d %d %d %d\n", s->block_align, avctx->bit_rate, s->frame_len, avctx->sample_rate); 71 avctx->frame_size= s->frame_len; 72 73 return 0; 74} 75 76 77static void apply_window_and_mdct(AVCodecContext * avctx, signed short * audio, int len) { 78 WMACodecContext *s = avctx->priv_data; 79 int window_index= s->frame_len_bits - s->block_len_bits; 80 int i, j, channel; 81 const float * win = s->windows[window_index]; 82 int window_len = 1 << s->block_len_bits; 83 float n = window_len/2; 84 85 for (channel = 0; channel < avctx->channels; channel++) { 86 memcpy(s->output, s->frame_out[channel], sizeof(float)*window_len); 87 j = channel; 88 for (i = 0; i < len; i++, j += avctx->channels){ 89 s->output[i+window_len] = audio[j] / n * win[window_len - i - 1]; 90 s->frame_out[channel][i] = audio[j] / n * win[i]; 91 } 92 ff_mdct_calc(&s->mdct_ctx[window_index], s->coefs[channel], s->output); 93 } 94} 95 96//FIXME use for decoding too 97static void init_exp(WMACodecContext *s, int ch, const int *exp_param){ 98 int n; 99 const uint16_t *ptr; 100 float v, *q, max_scale, *q_end; 101 102 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits]; 103 q = s->exponents[ch]; 104 q_end = q + s->block_len; 105 max_scale = 0; 106 while (q < q_end) { 107 /* XXX: use a table */ 108 v = pow(10, *exp_param++ * (1.0 / 16.0)); 109 max_scale= FFMAX(max_scale, v); 110 n = *ptr++; 111 do { 112 *q++ = v; 113 } while (--n); 114 } 115 s->max_exponent[ch] = max_scale; 116} 117 118static void encode_exp_vlc(WMACodecContext *s, int ch, const int *exp_param){ 119 int last_exp; 120 const uint16_t *ptr; 121 float *q, *q_end; 122 123 ptr = s->exponent_bands[s->frame_len_bits - s->block_len_bits]; 124 q = s->exponents[ch]; 125 q_end = q + s->block_len; 126 if (s->version == 1) { 127 last_exp= *exp_param++; 128 assert(last_exp-10 >= 0 && last_exp-10 < 32); 129 put_bits(&s->pb, 5, last_exp - 10); 130 q+= *ptr++; 131 }else 132 last_exp = 36; 133 while (q < q_end) { 134 int exp = *exp_param++; 135 int code = exp - last_exp + 60; 136 assert(code >= 0 && code < 120); 137 put_bits(&s->pb, ff_aac_scalefactor_bits[code], ff_aac_scalefactor_code[code]); 138 /* XXX: use a table */ 139 q+= *ptr++; 140 last_exp= exp; 141 } 142} 143 144static int encode_block(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], int total_gain){ 145 int v, bsize, ch, coef_nb_bits, parse_exponents; 146 float mdct_norm; 147 int nb_coefs[MAX_CHANNELS]; 148 static const int fixed_exp[25]={20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20}; 149 150 //FIXME remove duplication relative to decoder 151 if (s->use_variable_block_len) { 152 assert(0); //FIXME not implemented 153 }else{ 154 /* fixed block len */ 155 s->next_block_len_bits = s->frame_len_bits; 156 s->prev_block_len_bits = s->frame_len_bits; 157 s->block_len_bits = s->frame_len_bits; 158 } 159 160 s->block_len = 1 << s->block_len_bits; 161// assert((s->block_pos + s->block_len) <= s->frame_len); 162 bsize = s->frame_len_bits - s->block_len_bits; 163 164 //FIXME factor 165 v = s->coefs_end[bsize] - s->coefs_start; 166 for(ch = 0; ch < s->nb_channels; ch++) 167 nb_coefs[ch] = v; 168 { 169 int n4 = s->block_len / 2; 170 mdct_norm = 1.0 / (float)n4; 171 if (s->version == 1) { 172 mdct_norm *= sqrt(n4); 173 } 174 } 175 176 if (s->nb_channels == 2) { 177 put_bits(&s->pb, 1, s->ms_stereo= 1); 178 } 179 180 for(ch = 0; ch < s->nb_channels; ch++) { 181 s->channel_coded[ch] = 1; //FIXME only set channel_coded when needed, instead of always 182 if (s->channel_coded[ch]) { 183 init_exp(s, ch, fixed_exp); 184 } 185 } 186 187 for(ch = 0; ch < s->nb_channels; ch++) { 188 if (s->channel_coded[ch]) { 189 WMACoef *coefs1; 190 float *coefs, *exponents, mult; 191 int i, n; 192 193 coefs1 = s->coefs1[ch]; 194 exponents = s->exponents[ch]; 195 mult = pow(10, total_gain * 0.05) / s->max_exponent[ch]; 196 mult *= mdct_norm; 197 coefs = src_coefs[ch]; 198 if (s->use_noise_coding && 0) { 199 assert(0); //FIXME not implemented 200 } else { 201 coefs += s->coefs_start; 202 n = nb_coefs[ch]; 203 for(i = 0;i < n; i++){ 204 double t= *coefs++ / (exponents[i] * mult); 205 if(t<-32768 || t>32767) 206 return -1; 207 208 coefs1[i] = lrint(t); 209 } 210 } 211 } 212 } 213 214 v = 0; 215 for(ch = 0; ch < s->nb_channels; ch++) { 216 int a = s->channel_coded[ch]; 217 put_bits(&s->pb, 1, a); 218 v |= a; 219 } 220 221 if (!v) 222 return 1; 223 224 for(v= total_gain-1; v>=127; v-= 127) 225 put_bits(&s->pb, 7, 127); 226 put_bits(&s->pb, 7, v); 227 228 coef_nb_bits= ff_wma_total_gain_to_bits(total_gain); 229 230 if (s->use_noise_coding) { 231 for(ch = 0; ch < s->nb_channels; ch++) { 232 if (s->channel_coded[ch]) { 233 int i, n; 234 n = s->exponent_high_sizes[bsize]; 235 for(i=0;i<n;i++) { 236 put_bits(&s->pb, 1, s->high_band_coded[ch][i]= 0); 237 if (0) 238 nb_coefs[ch] -= s->exponent_high_bands[bsize][i]; 239 } 240 } 241 } 242 } 243 244 parse_exponents = 1; 245 if (s->block_len_bits != s->frame_len_bits) { 246 put_bits(&s->pb, 1, parse_exponents); 247 } 248 249 if (parse_exponents) { 250 for(ch = 0; ch < s->nb_channels; ch++) { 251 if (s->channel_coded[ch]) { 252 if (s->use_exp_vlc) { 253 encode_exp_vlc(s, ch, fixed_exp); 254 } else { 255 assert(0); //FIXME not implemented 256// encode_exp_lsp(s, ch); 257 } 258 } 259 } 260 } else { 261 assert(0); //FIXME not implemented 262 } 263 264 for(ch = 0; ch < s->nb_channels; ch++) { 265 if (s->channel_coded[ch]) { 266 int run, tindex; 267 WMACoef *ptr, *eptr; 268 tindex = (ch == 1 && s->ms_stereo); 269 ptr = &s->coefs1[ch][0]; 270 eptr = ptr + nb_coefs[ch]; 271 272 run=0; 273 for(;ptr < eptr; ptr++){ 274 if(*ptr){ 275 int level= *ptr; 276 int abs_level= FFABS(level); 277 int code= 0; 278 if(abs_level <= s->coef_vlcs[tindex]->max_level){ 279 if(run < s->coef_vlcs[tindex]->levels[abs_level-1]) 280 code= run + s->int_table[tindex][abs_level-1]; 281 } 282 283 assert(code < s->coef_vlcs[tindex]->n); 284 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[code], s->coef_vlcs[tindex]->huffcodes[code]); 285 286 if(code == 0){ 287 if(1<<coef_nb_bits <= abs_level) 288 return -1; 289 290 291 //Workaround minor rounding differences for the regression tests, FIXME we should find and replace the problematic float by fixpoint for reg tests 292 if(abs_level == 0x71B && (s->avctx->flags & CODEC_FLAG_BITEXACT)) abs_level=0x71A; 293 294 put_bits(&s->pb, coef_nb_bits, abs_level); 295 put_bits(&s->pb, s->frame_len_bits, run); 296 } 297 put_bits(&s->pb, 1, level < 0); //FIXME the sign is fliped somewhere 298 run=0; 299 }else{ 300 run++; 301 } 302 } 303 if(run) 304 put_bits(&s->pb, s->coef_vlcs[tindex]->huffbits[1], s->coef_vlcs[tindex]->huffcodes[1]); 305 } 306 if (s->version == 1 && s->nb_channels >= 2) { 307 align_put_bits(&s->pb); 308 } 309 } 310 return 0; 311} 312 313static int encode_frame(WMACodecContext *s, float (*src_coefs)[BLOCK_MAX_SIZE], uint8_t *buf, int buf_size, int total_gain){ 314 init_put_bits(&s->pb, buf, buf_size); 315 316 if (s->use_bit_reservoir) { 317 assert(0);//FIXME not implemented 318 }else{ 319 if(encode_block(s, src_coefs, total_gain) < 0) 320 return INT_MAX; 321 } 322 323 align_put_bits(&s->pb); 324 325 return put_bits_count(&s->pb)/8 - s->block_align; 326} 327 328static int encode_superframe(AVCodecContext *avctx, 329 unsigned char *buf, int buf_size, void *data){ 330 WMACodecContext *s = avctx->priv_data; 331 short *samples = data; 332 int i, total_gain; 333 334 s->block_len_bits= s->frame_len_bits; //required by non variable block len 335 s->block_len = 1 << s->block_len_bits; 336 337 apply_window_and_mdct(avctx, samples, avctx->frame_size); 338 339 if (s->ms_stereo) { 340 float a, b; 341 int i; 342 343 for(i = 0; i < s->block_len; i++) { 344 a = s->coefs[0][i]*0.5; 345 b = s->coefs[1][i]*0.5; 346 s->coefs[0][i] = a + b; 347 s->coefs[1][i] = a - b; 348 } 349 } 350 351#if 1 352 total_gain= 128; 353 for(i=64; i; i>>=1){ 354 int error= encode_frame(s, s->coefs, buf, buf_size, total_gain-i); 355 if(error<0) 356 total_gain-= i; 357 } 358#else 359 total_gain= 90; 360 best= encode_frame(s, s->coefs, buf, buf_size, total_gain); 361 for(i=32; i; i>>=1){ 362 int scoreL= encode_frame(s, s->coefs, buf, buf_size, total_gain-i); 363 int scoreR= encode_frame(s, s->coefs, buf, buf_size, total_gain+i); 364 av_log(NULL, AV_LOG_ERROR, "%d %d %d (%d)\n", scoreL, best, scoreR, total_gain); 365 if(scoreL < FFMIN(best, scoreR)){ 366 best = scoreL; 367 total_gain -= i; 368 }else if(scoreR < best){ 369 best = scoreR; 370 total_gain += i; 371 } 372 } 373#endif 374 375 encode_frame(s, s->coefs, buf, buf_size, total_gain); 376 assert((put_bits_count(&s->pb) & 7) == 0); 377 i= s->block_align - (put_bits_count(&s->pb)+7)/8; 378 assert(i>=0); 379 while(i--) 380 put_bits(&s->pb, 8, 'N'); 381 382 flush_put_bits(&s->pb); 383 return put_bits_ptr(&s->pb) - s->pb.buf; 384} 385 386AVCodec wmav1_encoder = 387{ 388 "wmav1", 389 AVMEDIA_TYPE_AUDIO, 390 CODEC_ID_WMAV1, 391 sizeof(WMACodecContext), 392 encode_init, 393 encode_superframe, 394 ff_wma_end, 395 .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, 396 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 1"), 397}; 398 399AVCodec wmav2_encoder = 400{ 401 "wmav2", 402 AVMEDIA_TYPE_AUDIO, 403 CODEC_ID_WMAV2, 404 sizeof(WMACodecContext), 405 encode_init, 406 encode_superframe, 407 ff_wma_end, 408 .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE}, 409 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 2"), 410}; 411