Libav 0.7.1
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00001 /* 00002 * Musepack SV8 decoder 00003 * Copyright (c) 2007 Konstantin Shishkov 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav 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 * Libav 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 Libav; 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 "mpegaudiodsp.h" 00033 #include "libavutil/audioconvert.h" 00034 00035 #include "mpc.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 int channels; 00103 00104 static VLC_TYPE band_table[542][2]; 00105 static VLC_TYPE q1_table[520][2]; 00106 static VLC_TYPE q9up_table[524][2]; 00107 static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2]; 00108 static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2]; 00109 static VLC_TYPE dscf0_table[560][2]; 00110 static VLC_TYPE dscf1_table[598][2]; 00111 static VLC_TYPE q3_0_table[512][2]; 00112 static VLC_TYPE q3_1_table[516][2]; 00113 static VLC_TYPE codes_table[5708][2]; 00114 00115 if(avctx->extradata_size < 2){ 00116 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); 00117 return -1; 00118 } 00119 memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); 00120 av_lfg_init(&c->rnd, 0xDEADBEEF); 00121 dsputil_init(&c->dsp, avctx); 00122 ff_mpadsp_init(&c->mpadsp); 00123 00124 ff_mpc_init(); 00125 00126 init_get_bits(&gb, avctx->extradata, 16); 00127 00128 skip_bits(&gb, 3);//sample rate 00129 c->maxbands = get_bits(&gb, 5) + 1; 00130 channels = get_bits(&gb, 4) + 1; 00131 if (channels > 2) { 00132 av_log_missing_feature(avctx, "Multichannel MPC SV8", 1); 00133 return -1; 00134 } 00135 c->MSS = get_bits1(&gb); 00136 c->frames = 1 << (get_bits(&gb, 3) * 2); 00137 00138 avctx->sample_fmt = AV_SAMPLE_FMT_S16; 00139 avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; 00140 00141 if(vlc_initialized) return 0; 00142 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); 00143 00144 band_vlc.table = band_table; 00145 band_vlc.table_allocated = 542; 00146 init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE, 00147 mpc8_bands_bits, 1, 1, 00148 mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00149 00150 q1_vlc.table = q1_table; 00151 q1_vlc.table_allocated = 520; 00152 init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE, 00153 mpc8_q1_bits, 1, 1, 00154 mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00155 q9up_vlc.table = q9up_table; 00156 q9up_vlc.table_allocated = 524; 00157 init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE, 00158 mpc8_q9up_bits, 1, 1, 00159 mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00160 00161 scfi_vlc[0].table = scfi0_table; 00162 scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS; 00163 init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE, 00164 mpc8_scfi0_bits, 1, 1, 00165 mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00166 scfi_vlc[1].table = scfi1_table; 00167 scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS; 00168 init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE, 00169 mpc8_scfi1_bits, 1, 1, 00170 mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00171 00172 dscf_vlc[0].table = dscf0_table; 00173 dscf_vlc[0].table_allocated = 560; 00174 init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE, 00175 mpc8_dscf0_bits, 1, 1, 00176 mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00177 dscf_vlc[1].table = dscf1_table; 00178 dscf_vlc[1].table_allocated = 598; 00179 init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE, 00180 mpc8_dscf1_bits, 1, 1, 00181 mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC); 00182 00183 q3_vlc[0].table = q3_0_table; 00184 q3_vlc[0].table_allocated = 512; 00185 init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE, 00186 mpc8_q3_bits, 1, 1, 00187 mpc8_q3_codes, 1, 1, 00188 mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); 00189 q3_vlc[1].table = q3_1_table; 00190 q3_vlc[1].table_allocated = 516; 00191 init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE, 00192 mpc8_q4_bits, 1, 1, 00193 mpc8_q4_codes, 1, 1, 00194 mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC); 00195 00196 for(i = 0; i < 2; i++){ 00197 res_vlc[i].table = &codes_table[vlc_offsets[0+i]]; 00198 res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i]; 00199 init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE, 00200 &mpc8_res_bits[i], 1, 1, 00201 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00202 00203 q2_vlc[i].table = &codes_table[vlc_offsets[2+i]]; 00204 q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i]; 00205 init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE, 00206 &mpc8_q2_bits[i], 1, 1, 00207 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00208 00209 quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]]; 00210 quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i]; 00211 init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE, 00212 &mpc8_q5_bits[i], 1, 1, 00213 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00214 quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]]; 00215 quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i]; 00216 init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE, 00217 &mpc8_q6_bits[i], 1, 1, 00218 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00219 quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]]; 00220 quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i]; 00221 init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE, 00222 &mpc8_q7_bits[i], 1, 1, 00223 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00224 quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]]; 00225 quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i]; 00226 init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE, 00227 &mpc8_q8_bits[i], 1, 1, 00228 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC); 00229 } 00230 vlc_initialized = 1; 00231 return 0; 00232 } 00233 00234 static int mpc8_decode_frame(AVCodecContext * avctx, 00235 void *data, int *data_size, 00236 AVPacket *avpkt) 00237 { 00238 const uint8_t *buf = avpkt->data; 00239 int buf_size = avpkt->size; 00240 MPCContext *c = avctx->priv_data; 00241 GetBitContext gb2, *gb = &gb2; 00242 int i, j, k, ch, cnt, res, t; 00243 Band *bands = c->bands; 00244 int off, out_size; 00245 int maxband, keyframe; 00246 int last[2]; 00247 00248 out_size = MPC_FRAME_SIZE * 2 * avctx->channels; 00249 if (*data_size < out_size) { 00250 av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n"); 00251 return AVERROR(EINVAL); 00252 } 00253 00254 keyframe = c->cur_frame == 0; 00255 00256 if(keyframe){ 00257 memset(c->Q, 0, sizeof(c->Q)); 00258 c->last_bits_used = 0; 00259 } 00260 init_get_bits(gb, buf, buf_size * 8); 00261 skip_bits(gb, c->last_bits_used & 7); 00262 00263 if(keyframe) 00264 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1); 00265 else{ 00266 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2); 00267 if(maxband > 32) maxband -= 33; 00268 } 00269 if(maxband > c->maxbands) 00270 return AVERROR_INVALIDDATA; 00271 c->last_max_band = maxband; 00272 00273 /* read subband indexes */ 00274 if(maxband){ 00275 last[0] = last[1] = 0; 00276 for(i = maxband - 1; i >= 0; i--){ 00277 for(ch = 0; ch < 2; ch++){ 00278 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch]; 00279 if(last[ch] > 15) last[ch] -= 17; 00280 bands[i].res[ch] = last[ch]; 00281 } 00282 } 00283 if(c->MSS){ 00284 int mask; 00285 00286 cnt = 0; 00287 for(i = 0; i < maxband; i++) 00288 if(bands[i].res[0] || bands[i].res[1]) 00289 cnt++; 00290 t = mpc8_get_mod_golomb(gb, cnt); 00291 mask = mpc8_get_mask(gb, cnt, t); 00292 for(i = maxband - 1; i >= 0; i--) 00293 if(bands[i].res[0] || bands[i].res[1]){ 00294 bands[i].msf = mask & 1; 00295 mask >>= 1; 00296 } 00297 } 00298 } 00299 for(i = maxband; i < c->maxbands; i++) 00300 bands[i].res[0] = bands[i].res[1] = 0; 00301 00302 if(keyframe){ 00303 for(i = 0; i < 32; i++) 00304 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1; 00305 } 00306 00307 for(i = 0; i < maxband; i++){ 00308 if(bands[i].res[0] || bands[i].res[1]){ 00309 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1; 00310 if(cnt >= 0){ 00311 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1); 00312 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt); 00313 if(bands[i].res[1]) bands[i].scfi[1] = t & 3; 00314 } 00315 } 00316 } 00317 00318 for(i = 0; i < maxband; i++){ 00319 for(ch = 0; ch < 2; ch++){ 00320 if(!bands[i].res[ch]) continue; 00321 00322 if(c->oldDSCF[ch][i]){ 00323 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6; 00324 c->oldDSCF[ch][i] = 0; 00325 }else{ 00326 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2); 00327 if(t == 64) 00328 t += get_bits(gb, 6); 00329 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6; 00330 } 00331 for(j = 0; j < 2; j++){ 00332 if((bands[i].scfi[ch] << j) & 2) 00333 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j]; 00334 else{ 00335 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2); 00336 if(t == 31) 00337 t = 64 + get_bits(gb, 6); 00338 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6; 00339 } 00340 } 00341 } 00342 } 00343 00344 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){ 00345 for(ch = 0; ch < 2; ch++){ 00346 res = bands[i].res[ch]; 00347 switch(res){ 00348 case -1: 00349 for(j = 0; j < SAMPLES_PER_BAND; j++) 00350 c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510; 00351 break; 00352 case 0: 00353 break; 00354 case 1: 00355 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){ 00356 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2); 00357 t = mpc8_get_mask(gb, 18, cnt); 00358 for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1) 00359 c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0; 00360 } 00361 break; 00362 case 2: 00363 cnt = 6;//2*mpc8_thres[res] 00364 for(j = 0; j < SAMPLES_PER_BAND; j += 3){ 00365 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2); 00366 c->Q[ch][off + j + 0] = mpc8_idx50[t]; 00367 c->Q[ch][off + j + 1] = mpc8_idx51[t]; 00368 c->Q[ch][off + j + 2] = mpc8_idx52[t]; 00369 cnt = (cnt >> 1) + mpc8_huffq2[t]; 00370 } 00371 break; 00372 case 3: 00373 case 4: 00374 for(j = 0; j < SAMPLES_PER_BAND; j += 2){ 00375 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3]; 00376 c->Q[ch][off + j + 1] = t >> 4; 00377 c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF); 00378 } 00379 break; 00380 case 5: 00381 case 6: 00382 case 7: 00383 case 8: 00384 cnt = 2 * mpc8_thres[res]; 00385 for(j = 0; j < SAMPLES_PER_BAND; j++){ 00386 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]; 00387 c->Q[ch][off + j] = t; 00388 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]); 00389 } 00390 break; 00391 default: 00392 for(j = 0; j < SAMPLES_PER_BAND; j++){ 00393 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2); 00394 if(res != 9){ 00395 c->Q[ch][off + j] <<= res - 9; 00396 c->Q[ch][off + j] |= get_bits(gb, res - 9); 00397 } 00398 c->Q[ch][off + j] -= (1 << (res - 2)) - 1; 00399 } 00400 } 00401 } 00402 } 00403 00404 ff_mpc_dequantize_and_synth(c, maxband, data, avctx->channels); 00405 00406 c->cur_frame++; 00407 00408 c->last_bits_used = get_bits_count(gb); 00409 if(c->cur_frame >= c->frames) 00410 c->cur_frame = 0; 00411 *data_size = out_size; 00412 00413 return c->cur_frame ? c->last_bits_used >> 3 : buf_size; 00414 } 00415 00416 AVCodec ff_mpc8_decoder = { 00417 "mpc8", 00418 AVMEDIA_TYPE_AUDIO, 00419 CODEC_ID_MUSEPACK8, 00420 sizeof(MPCContext), 00421 mpc8_decode_init, 00422 NULL, 00423 NULL, 00424 mpc8_decode_frame, 00425 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"), 00426 };