Libav
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00001 /* 00002 * Musepack SV8 decoder 00003 * Copyright (c) 2007 Konstantin Shishkov 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00028 #include "libavutil/lfg.h" 00029 #include "avcodec.h" 00030 #include "get_bits.h" 00031 #include "dsputil.h" 00032 #include "mpegaudio.h" 00033 00034 #include "mpc.h" 00035 #include "mpcdata.h" 00036 #include "mpc8data.h" 00037 #include "mpc8huff.h" 00038 00039 static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2]; 00040 static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc; 00041 00042 static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET }; 00043 static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET }; 00044 00045 static inline int mpc8_dec_base(GetBitContext *gb, int k, int n) 00046 { 00047 int len = mpc8_cnk_len[k-1][n-1] - 1; 00048 int code = len ? get_bits_long(gb, len) : 0; 00049 00050 if (code >= mpc8_cnk_lost[k-1][n-1]) 00051 code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1]; 00052 00053 return code; 00054 } 00055 00056 static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n) 00057 { 00058 int bits = 0; 00059 const uint32_t * C = mpc8_cnk[k-1]; 00060 int code = mpc8_dec_base(gb, k, n); 00061 00062 do { 00063 n--; 00064 if (code >= C[n]) { 00065 bits |= 1 << n; 00066 code -= C[n]; 00067 C -= 32; 00068 k--; 00069 } 00070 } while(k > 0); 00071 00072 return bits; 00073 } 00074 00075 static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m) 00076 { 00077 if(mpc8_cnk_len[0][m] < 1) return 0; 00078 return mpc8_dec_base(gb, 1, m+1); 00079 } 00080 00081 static int mpc8_get_mask(GetBitContext *gb, int size, int t) 00082 { 00083 int mask = 0; 00084 00085 if(t && t != size) 00086 mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size); 00087 if((t << 1) > size) mask = ~mask; 00088 00089 return mask; 00090 } 00091 00092 static const uint16_t vlc_offsets[13] = { 00093 0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708 00094 }; 00095 00096 static av_cold int mpc8_decode_init(AVCodecContext * avctx) 00097 { 00098 int i; 00099 MPCContext *c = avctx->priv_data; 00100 GetBitContext gb; 00101 static int vlc_initialized = 0; 00102 00103 static VLC_TYPE band_table[542][2]; 00104 static VLC_TYPE q1_table[520][2]; 00105 static VLC_TYPE q9up_table[524][2]; 00106 static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2]; 00107 static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2]; 00108 static VLC_TYPE dscf0_table[560][2]; 00109 static VLC_TYPE dscf1_table[598][2]; 00110 static VLC_TYPE q3_0_table[512][2]; 00111 static VLC_TYPE q3_1_table[516][2]; 00112 static VLC_TYPE codes_table[5708][2]; 00113 00114 if(avctx->extradata_size < 2){ 00115 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); 00116 return -1; 00117 } 00118 memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); 00119 av_lfg_init(&c->rnd, 0xDEADBEEF); 00120 dsputil_init(&c->dsp, avctx); 00121 00122 ff_mpc_init(); 00123 00124 init_get_bits(&gb, avctx->extradata, 16); 00125 00126 skip_bits(&gb, 3);//sample rate 00127 c->maxbands = get_bits(&gb, 5) + 1; 00128 skip_bits(&gb, 4);//channels 00129 c->MSS = get_bits1(&gb); 00130 c->frames = 1 << (get_bits(&gb, 3) * 2); 00131 00132 avctx->sample_fmt = SAMPLE_FMT_S16; 00133 avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO; 00134 00135 if(vlc_initialized) return 0; 00136 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); 00137 00138 band_vlc.table = band_table; 00139 band_vlc.table_allocated = 542; 00140 init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE, 00141 mpc8_bands_bits, 1, 1, 00142 mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00143 00144 q1_vlc.table = q1_table; 00145 q1_vlc.table_allocated = 520; 00146 init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE, 00147 mpc8_q1_bits, 1, 1, 00148 mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00149 q9up_vlc.table = q9up_table; 00150 q9up_vlc.table_allocated = 524; 00151 init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE, 00152 mpc8_q9up_bits, 1, 1, 00153 mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00154 00155 scfi_vlc[0].table = scfi0_table; 00156 scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS; 00157 init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE, 00158 mpc8_scfi0_bits, 1, 1, 00159 mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00160 scfi_vlc[1].table = scfi1_table; 00161 scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS; 00162 init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE, 00163 mpc8_scfi1_bits, 1, 1, 00164 mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00165 00166 dscf_vlc[0].table = dscf0_table; 00167 dscf_vlc[0].table_allocated = 560; 00168 init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE, 00169 mpc8_dscf0_bits, 1, 1, 00170 mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00171 dscf_vlc[1].table = dscf1_table; 00172 dscf_vlc[1].table_allocated = 598; 00173 init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE, 00174 mpc8_dscf1_bits, 1, 1, 00175 mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00176 00177 q3_vlc[0].table = q3_0_table; 00178 q3_vlc[0].table_allocated = 512; 00179 init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE, 00180 mpc8_q3_bits, 1, 1, 00181 mpc8_q3_codes, 1, 1, 00182 mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); 00183 q3_vlc[1].table = q3_1_table; 00184 q3_vlc[1].table_allocated = 516; 00185 init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE, 00186 mpc8_q4_bits, 1, 1, 00187 mpc8_q4_codes, 1, 1, 00188 mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); 00189 00190 for(i = 0; i < 2; i++){ 00191 res_vlc[i].table = &codes_table[vlc_offsets[0+i]]; 00192 res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i]; 00193 init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE, 00194 &mpc8_res_bits[i], 1, 1, 00195 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00196 00197 q2_vlc[i].table = &codes_table[vlc_offsets[2+i]]; 00198 q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i]; 00199 init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE, 00200 &mpc8_q2_bits[i], 1, 1, 00201 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00202 00203 quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]]; 00204 quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i]; 00205 init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE, 00206 &mpc8_q5_bits[i], 1, 1, 00207 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00208 quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]]; 00209 quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i]; 00210 init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE, 00211 &mpc8_q6_bits[i], 1, 1, 00212 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00213 quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]]; 00214 quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i]; 00215 init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE, 00216 &mpc8_q7_bits[i], 1, 1, 00217 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00218 quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]]; 00219 quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i]; 00220 init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE, 00221 &mpc8_q8_bits[i], 1, 1, 00222 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00223 } 00224 vlc_initialized = 1; 00225 return 0; 00226 } 00227 00228 static int mpc8_decode_frame(AVCodecContext * avctx, 00229 void *data, int *data_size, 00230 AVPacket *avpkt) 00231 { 00232 const uint8_t *buf = avpkt->data; 00233 int buf_size = avpkt->size; 00234 MPCContext *c = avctx->priv_data; 00235 GetBitContext gb2, *gb = &gb2; 00236 int i, j, k, ch, cnt, res, t; 00237 Band *bands = c->bands; 00238 int off; 00239 int maxband, keyframe; 00240 int last[2]; 00241 00242 keyframe = c->cur_frame == 0; 00243 00244 if(keyframe){ 00245 memset(c->Q, 0, sizeof(c->Q)); 00246 c->last_bits_used = 0; 00247 } 00248 init_get_bits(gb, buf, buf_size * 8); 00249 skip_bits(gb, c->last_bits_used & 7); 00250 00251 if(keyframe) 00252 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1); 00253 else{ 00254 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2); 00255 if(maxband > 32) maxband -= 33; 00256 } 00257 c->last_max_band = maxband; 00258 00259 /* read subband indexes */ 00260 if(maxband){ 00261 last[0] = last[1] = 0; 00262 for(i = maxband - 1; i >= 0; i--){ 00263 for(ch = 0; ch < 2; ch++){ 00264 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch]; 00265 if(last[ch] > 15) last[ch] -= 17; 00266 bands[i].res[ch] = last[ch]; 00267 } 00268 } 00269 if(c->MSS){ 00270 int mask; 00271 00272 cnt = 0; 00273 for(i = 0; i < maxband; i++) 00274 if(bands[i].res[0] || bands[i].res[1]) 00275 cnt++; 00276 t = mpc8_get_mod_golomb(gb, cnt); 00277 mask = mpc8_get_mask(gb, cnt, t); 00278 for(i = maxband - 1; i >= 0; i--) 00279 if(bands[i].res[0] || bands[i].res[1]){ 00280 bands[i].msf = mask & 1; 00281 mask >>= 1; 00282 } 00283 } 00284 } 00285 for(i = maxband; i < c->maxbands; i++) 00286 bands[i].res[0] = bands[i].res[1] = 0; 00287 00288 if(keyframe){ 00289 for(i = 0; i < 32; i++) 00290 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1; 00291 } 00292 00293 for(i = 0; i < maxband; i++){ 00294 if(bands[i].res[0] || bands[i].res[1]){ 00295 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1; 00296 if(cnt >= 0){ 00297 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1); 00298 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt); 00299 if(bands[i].res[1]) bands[i].scfi[1] = t & 3; 00300 } 00301 } 00302 } 00303 00304 for(i = 0; i < maxband; i++){ 00305 for(ch = 0; ch < 2; ch++){ 00306 if(!bands[i].res[ch]) continue; 00307 00308 if(c->oldDSCF[ch][i]){ 00309 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6; 00310 c->oldDSCF[ch][i] = 0; 00311 }else{ 00312 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2); 00313 if(t == 64) 00314 t += get_bits(gb, 6); 00315 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6; 00316 } 00317 for(j = 0; j < 2; j++){ 00318 if((bands[i].scfi[ch] << j) & 2) 00319 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j]; 00320 else{ 00321 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2); 00322 if(t == 31) 00323 t = 64 + get_bits(gb, 6); 00324 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6; 00325 } 00326 } 00327 } 00328 } 00329 00330 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){ 00331 for(ch = 0; ch < 2; ch++){ 00332 res = bands[i].res[ch]; 00333 switch(res){ 00334 case -1: 00335 for(j = 0; j < SAMPLES_PER_BAND; j++) 00336 c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510; 00337 break; 00338 case 0: 00339 break; 00340 case 1: 00341 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){ 00342 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2); 00343 t = mpc8_get_mask(gb, 18, cnt); 00344 for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1) 00345 c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0; 00346 } 00347 break; 00348 case 2: 00349 cnt = 6;//2*mpc8_thres[res] 00350 for(j = 0; j < SAMPLES_PER_BAND; j += 3){ 00351 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2); 00352 c->Q[ch][off + j + 0] = mpc8_idx50[t]; 00353 c->Q[ch][off + j + 1] = mpc8_idx51[t]; 00354 c->Q[ch][off + j + 2] = mpc8_idx52[t]; 00355 cnt = (cnt >> 1) + mpc8_huffq2[t]; 00356 } 00357 break; 00358 case 3: 00359 case 4: 00360 for(j = 0; j < SAMPLES_PER_BAND; j += 2){ 00361 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3]; 00362 c->Q[ch][off + j + 1] = t >> 4; 00363 c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF); 00364 } 00365 break; 00366 case 5: 00367 case 6: 00368 case 7: 00369 case 8: 00370 cnt = 2 * mpc8_thres[res]; 00371 for(j = 0; j < SAMPLES_PER_BAND; j++){ 00372 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]; 00373 c->Q[ch][off + j] = t; 00374 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]); 00375 } 00376 break; 00377 default: 00378 for(j = 0; j < SAMPLES_PER_BAND; j++){ 00379 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2); 00380 if(res != 9){ 00381 c->Q[ch][off + j] <<= res - 9; 00382 c->Q[ch][off + j] |= get_bits(gb, res - 9); 00383 } 00384 c->Q[ch][off + j] -= (1 << (res - 2)) - 1; 00385 } 00386 } 00387 } 00388 } 00389 00390 ff_mpc_dequantize_and_synth(c, maxband, data); 00391 00392 c->cur_frame++; 00393 00394 c->last_bits_used = get_bits_count(gb); 00395 if(c->cur_frame >= c->frames) 00396 c->cur_frame = 0; 00397 *data_size = MPC_FRAME_SIZE * 4; 00398 00399 return c->cur_frame ? c->last_bits_used >> 3 : buf_size; 00400 } 00401 00402 AVCodec mpc8_decoder = { 00403 "mpc8", 00404 AVMEDIA_TYPE_AUDIO, 00405 CODEC_ID_MUSEPACK8, 00406 sizeof(MPCContext), 00407 mpc8_decode_init, 00408 NULL, 00409 NULL, 00410 mpc8_decode_frame, 00411 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"), 00412 };