1/* 2 * Musepack SV8 decoder 3 * Copyright (c) 2007 Konstantin Shishkov 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/** 23 * @file 24 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples 25 * divided into 32 subbands. 26 */ 27 28#include "libavutil/lfg.h" 29#include "avcodec.h" 30#include "get_bits.h" 31#include "dsputil.h" 32#include "mpegaudiodsp.h" 33#include "libavutil/audioconvert.h" 34 35#include "mpc.h" 36#include "mpc8data.h" 37#include "mpc8huff.h" 38 39static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2]; 40static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc; 41 42static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET }; 43static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET }; 44 45static inline int mpc8_dec_base(GetBitContext *gb, int k, int n) 46{ 47 int len = mpc8_cnk_len[k-1][n-1] - 1; 48 int code = len ? get_bits_long(gb, len) : 0; 49 50 if (code >= mpc8_cnk_lost[k-1][n-1]) 51 code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1]; 52 53 return code; 54} 55 56static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n) 57{ 58 int bits = 0; 59 const uint32_t * C = mpc8_cnk[k-1]; 60 int code = mpc8_dec_base(gb, k, n); 61 62 do { 63 n--; 64 if (code >= C[n]) { 65 bits |= 1 << n; 66 code -= C[n]; 67 C -= 32; 68 k--; 69 } 70 } while(k > 0); 71 72 return bits; 73} 74 75static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m) 76{ 77 if(mpc8_cnk_len[0][m] < 1) return 0; 78 return mpc8_dec_base(gb, 1, m+1); 79} 80 81static int mpc8_get_mask(GetBitContext *gb, int size, int t) 82{ 83 int mask = 0; 84 85 if(t && t != size) 86 mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size); 87 if((t << 1) > size) mask = ~mask; 88 89 return mask; 90} 91 92static const uint16_t vlc_offsets[13] = { 93 0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708 94}; 95 96static av_cold int mpc8_decode_init(AVCodecContext * avctx) 97{ 98 int i; 99 MPCContext *c = avctx->priv_data; 100 GetBitContext gb; 101 static int vlc_initialized = 0; 102 int channels; 103 104 static VLC_TYPE band_table[542][2]; 105 static VLC_TYPE q1_table[520][2]; 106 static VLC_TYPE q9up_table[524][2]; 107 static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2]; 108 static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2]; 109 static VLC_TYPE dscf0_table[560][2]; 110 static VLC_TYPE dscf1_table[598][2]; 111 static VLC_TYPE q3_0_table[512][2]; 112 static VLC_TYPE q3_1_table[516][2]; 113 static VLC_TYPE codes_table[5708][2]; 114 115 if(avctx->extradata_size < 2){ 116 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); 117 return -1; 118 } 119 memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); 120 av_lfg_init(&c->rnd, 0xDEADBEEF); 121 dsputil_init(&c->dsp, avctx); 122 ff_mpadsp_init(&c->mpadsp); 123 124 ff_mpc_init(); 125 126 init_get_bits(&gb, avctx->extradata, 16); 127 128 skip_bits(&gb, 3);//sample rate 129 c->maxbands = get_bits(&gb, 5) + 1; 130 channels = get_bits(&gb, 4) + 1; 131 if (channels > 2) { 132 av_log_missing_feature(avctx, "Multichannel MPC SV8", 1); 133 return -1; 134 } 135 c->MSS = get_bits1(&gb); 136 c->frames = 1 << (get_bits(&gb, 3) * 2); 137 138 avctx->sample_fmt = AV_SAMPLE_FMT_S16; 139 avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; 140 141 if(vlc_initialized) return 0; 142 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); 143 144 band_vlc.table = band_table; 145 band_vlc.table_allocated = 542; 146 init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE, 147 mpc8_bands_bits, 1, 1, 148 mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 149 150 q1_vlc.table = q1_table; 151 q1_vlc.table_allocated = 520; 152 init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE, 153 mpc8_q1_bits, 1, 1, 154 mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 155 q9up_vlc.table = q9up_table; 156 q9up_vlc.table_allocated = 524; 157 init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE, 158 mpc8_q9up_bits, 1, 1, 159 mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 160 161 scfi_vlc[0].table = scfi0_table; 162 scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS; 163 init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE, 164 mpc8_scfi0_bits, 1, 1, 165 mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 166 scfi_vlc[1].table = scfi1_table; 167 scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS; 168 init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE, 169 mpc8_scfi1_bits, 1, 1, 170 mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 171 172 dscf_vlc[0].table = dscf0_table; 173 dscf_vlc[0].table_allocated = 560; 174 init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE, 175 mpc8_dscf0_bits, 1, 1, 176 mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 177 dscf_vlc[1].table = dscf1_table; 178 dscf_vlc[1].table_allocated = 598; 179 init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE, 180 mpc8_dscf1_bits, 1, 1, 181 mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 182 183 q3_vlc[0].table = q3_0_table; 184 q3_vlc[0].table_allocated = 512; 185 ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE, 186 mpc8_q3_bits, 1, 1, 187 mpc8_q3_codes, 1, 1, 188 mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); 189 q3_vlc[1].table = q3_1_table; 190 q3_vlc[1].table_allocated = 516; 191 ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE, 192 mpc8_q4_bits, 1, 1, 193 mpc8_q4_codes, 1, 1, 194 mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); 195 196 for(i = 0; i < 2; i++){ 197 res_vlc[i].table = &codes_table[vlc_offsets[0+i]]; 198 res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i]; 199 init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE, 200 &mpc8_res_bits[i], 1, 1, 201 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 202 203 q2_vlc[i].table = &codes_table[vlc_offsets[2+i]]; 204 q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i]; 205 init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE, 206 &mpc8_q2_bits[i], 1, 1, 207 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 208 209 quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]]; 210 quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i]; 211 init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE, 212 &mpc8_q5_bits[i], 1, 1, 213 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 214 quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]]; 215 quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i]; 216 init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE, 217 &mpc8_q6_bits[i], 1, 1, 218 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 219 quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]]; 220 quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i]; 221 init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE, 222 &mpc8_q7_bits[i], 1, 1, 223 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 224 quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]]; 225 quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i]; 226 init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE, 227 &mpc8_q8_bits[i], 1, 1, 228 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 229 } 230 vlc_initialized = 1; 231 232 avcodec_get_frame_defaults(&c->frame); 233 avctx->coded_frame = &c->frame; 234 235 return 0; 236} 237 238static int mpc8_decode_frame(AVCodecContext * avctx, void *data, 239 int *got_frame_ptr, AVPacket *avpkt) 240{ 241 const uint8_t *buf = avpkt->data; 242 int buf_size = avpkt->size; 243 MPCContext *c = avctx->priv_data; 244 GetBitContext gb2, *gb = &gb2; 245 int i, j, k, ch, cnt, res, t; 246 Band *bands = c->bands; 247 int off; 248 int maxband, keyframe; 249 int last[2]; 250 251 /* get output buffer */ 252 c->frame.nb_samples = MPC_FRAME_SIZE; 253 if ((res = avctx->get_buffer(avctx, &c->frame)) < 0) { 254 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); 255 return res; 256 } 257 258 keyframe = c->cur_frame == 0; 259 260 if(keyframe){ 261 memset(c->Q, 0, sizeof(c->Q)); 262 c->last_bits_used = 0; 263 } 264 init_get_bits(gb, buf, buf_size * 8); 265 skip_bits(gb, c->last_bits_used & 7); 266 267 if(keyframe) 268 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1); 269 else{ 270 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2); 271 if(maxband > 32) maxband -= 33; 272 } 273 if(maxband > c->maxbands) 274 return AVERROR_INVALIDDATA; 275 c->last_max_band = maxband; 276 277 /* read subband indexes */ 278 if(maxband){ 279 last[0] = last[1] = 0; 280 for(i = maxband - 1; i >= 0; i--){ 281 for(ch = 0; ch < 2; ch++){ 282 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch]; 283 if(last[ch] > 15) last[ch] -= 17; 284 bands[i].res[ch] = last[ch]; 285 } 286 } 287 if(c->MSS){ 288 int mask; 289 290 cnt = 0; 291 for(i = 0; i < maxband; i++) 292 if(bands[i].res[0] || bands[i].res[1]) 293 cnt++; 294 t = mpc8_get_mod_golomb(gb, cnt); 295 mask = mpc8_get_mask(gb, cnt, t); 296 for(i = maxband - 1; i >= 0; i--) 297 if(bands[i].res[0] || bands[i].res[1]){ 298 bands[i].msf = mask & 1; 299 mask >>= 1; 300 } 301 } 302 } 303 for(i = maxband; i < c->maxbands; i++) 304 bands[i].res[0] = bands[i].res[1] = 0; 305 306 if(keyframe){ 307 for(i = 0; i < 32; i++) 308 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1; 309 } 310 311 for(i = 0; i < maxband; i++){ 312 if(bands[i].res[0] || bands[i].res[1]){ 313 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1; 314 if(cnt >= 0){ 315 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1); 316 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt); 317 if(bands[i].res[1]) bands[i].scfi[1] = t & 3; 318 } 319 } 320 } 321 322 for(i = 0; i < maxband; i++){ 323 for(ch = 0; ch < 2; ch++){ 324 if(!bands[i].res[ch]) continue; 325 326 if(c->oldDSCF[ch][i]){ 327 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6; 328 c->oldDSCF[ch][i] = 0; 329 }else{ 330 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2); 331 if(t == 64) 332 t += get_bits(gb, 6); 333 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6; 334 } 335 for(j = 0; j < 2; j++){ 336 if((bands[i].scfi[ch] << j) & 2) 337 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j]; 338 else{ 339 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2); 340 if(t == 31) 341 t = 64 + get_bits(gb, 6); 342 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6; 343 } 344 } 345 } 346 } 347 348 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){ 349 for(ch = 0; ch < 2; ch++){ 350 res = bands[i].res[ch]; 351 switch(res){ 352 case -1: 353 for(j = 0; j < SAMPLES_PER_BAND; j++) 354 c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510; 355 break; 356 case 0: 357 break; 358 case 1: 359 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){ 360 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2); 361 t = mpc8_get_mask(gb, 18, cnt); 362 for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1) 363 c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0; 364 } 365 break; 366 case 2: 367 cnt = 6;//2*mpc8_thres[res] 368 for(j = 0; j < SAMPLES_PER_BAND; j += 3){ 369 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2); 370 c->Q[ch][off + j + 0] = mpc8_idx50[t]; 371 c->Q[ch][off + j + 1] = mpc8_idx51[t]; 372 c->Q[ch][off + j + 2] = mpc8_idx52[t]; 373 cnt = (cnt >> 1) + mpc8_huffq2[t]; 374 } 375 break; 376 case 3: 377 case 4: 378 for(j = 0; j < SAMPLES_PER_BAND; j += 2){ 379 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3]; 380 c->Q[ch][off + j + 1] = t >> 4; 381 c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF); 382 } 383 break; 384 case 5: 385 case 6: 386 case 7: 387 case 8: 388 cnt = 2 * mpc8_thres[res]; 389 for(j = 0; j < SAMPLES_PER_BAND; j++){ 390 t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5]; 391 c->Q[ch][off + j] = t; 392 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]); 393 } 394 break; 395 default: 396 for(j = 0; j < SAMPLES_PER_BAND; j++){ 397 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2); 398 if(res != 9){ 399 c->Q[ch][off + j] <<= res - 9; 400 c->Q[ch][off + j] |= get_bits(gb, res - 9); 401 } 402 c->Q[ch][off + j] -= (1 << (res - 2)) - 1; 403 } 404 } 405 } 406 } 407 408 ff_mpc_dequantize_and_synth(c, maxband, c->frame.data[0], avctx->channels); 409 410 c->cur_frame++; 411 412 c->last_bits_used = get_bits_count(gb); 413 if(c->cur_frame >= c->frames) 414 c->cur_frame = 0; 415 416 *got_frame_ptr = 1; 417 *(AVFrame *)data = c->frame; 418 419 return c->cur_frame ? c->last_bits_used >> 3 : buf_size; 420} 421 422AVCodec ff_mpc8_decoder = { 423 .name = "mpc8", 424 .type = AVMEDIA_TYPE_AUDIO, 425 .id = CODEC_ID_MUSEPACK8, 426 .priv_data_size = sizeof(MPCContext), 427 .init = mpc8_decode_init, 428 .decode = mpc8_decode_frame, 429 .capabilities = CODEC_CAP_DR1, 430 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"), 431}; 432