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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);
00129 c->maxbands = get_bits(&gb, 5) + 1;
00130 if (c->maxbands >= BANDS)
00131 return AVERROR_INVALIDDATA;
00132 channels = get_bits(&gb, 4) + 1;
00133 if (channels > 2) {
00134 av_log_missing_feature(avctx, "Multichannel MPC SV8", 1);
00135 return -1;
00136 }
00137 c->MSS = get_bits1(&gb);
00138 c->frames = 1 << (get_bits(&gb, 3) * 2);
00139
00140 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
00141 avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
00142
00143 if(vlc_initialized) return 0;
00144 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
00145
00146 band_vlc.table = band_table;
00147 band_vlc.table_allocated = 542;
00148 init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
00149 mpc8_bands_bits, 1, 1,
00150 mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00151
00152 q1_vlc.table = q1_table;
00153 q1_vlc.table_allocated = 520;
00154 init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
00155 mpc8_q1_bits, 1, 1,
00156 mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00157 q9up_vlc.table = q9up_table;
00158 q9up_vlc.table_allocated = 524;
00159 init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
00160 mpc8_q9up_bits, 1, 1,
00161 mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00162
00163 scfi_vlc[0].table = scfi0_table;
00164 scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
00165 init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
00166 mpc8_scfi0_bits, 1, 1,
00167 mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00168 scfi_vlc[1].table = scfi1_table;
00169 scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
00170 init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
00171 mpc8_scfi1_bits, 1, 1,
00172 mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00173
00174 dscf_vlc[0].table = dscf0_table;
00175 dscf_vlc[0].table_allocated = 560;
00176 init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
00177 mpc8_dscf0_bits, 1, 1,
00178 mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00179 dscf_vlc[1].table = dscf1_table;
00180 dscf_vlc[1].table_allocated = 598;
00181 init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
00182 mpc8_dscf1_bits, 1, 1,
00183 mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00184
00185 q3_vlc[0].table = q3_0_table;
00186 q3_vlc[0].table_allocated = 512;
00187 init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
00188 mpc8_q3_bits, 1, 1,
00189 mpc8_q3_codes, 1, 1,
00190 mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
00191 q3_vlc[1].table = q3_1_table;
00192 q3_vlc[1].table_allocated = 516;
00193 init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
00194 mpc8_q4_bits, 1, 1,
00195 mpc8_q4_codes, 1, 1,
00196 mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
00197
00198 for(i = 0; i < 2; i++){
00199 res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
00200 res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
00201 init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
00202 &mpc8_res_bits[i], 1, 1,
00203 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00204
00205 q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
00206 q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
00207 init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
00208 &mpc8_q2_bits[i], 1, 1,
00209 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00210
00211 quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
00212 quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
00213 init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
00214 &mpc8_q5_bits[i], 1, 1,
00215 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00216 quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
00217 quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
00218 init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
00219 &mpc8_q6_bits[i], 1, 1,
00220 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00221 quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
00222 quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
00223 init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
00224 &mpc8_q7_bits[i], 1, 1,
00225 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00226 quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
00227 quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
00228 init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
00229 &mpc8_q8_bits[i], 1, 1,
00230 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00231 }
00232 vlc_initialized = 1;
00233 return 0;
00234 }
00235
00236 static int mpc8_decode_frame(AVCodecContext * avctx,
00237 void *data, int *data_size,
00238 AVPacket *avpkt)
00239 {
00240 const uint8_t *buf = avpkt->data;
00241 int buf_size = avpkt->size;
00242 MPCContext *c = avctx->priv_data;
00243 GetBitContext gb2, *gb = &gb2;
00244 int i, j, k, ch, cnt, res, t;
00245 Band *bands = c->bands;
00246 int off, out_size;
00247 int maxband, keyframe;
00248 int last[2];
00249
00250 out_size = MPC_FRAME_SIZE * 2 * avctx->channels;
00251 if (*data_size < out_size) {
00252 av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
00253 return AVERROR(EINVAL);
00254 }
00255
00256 keyframe = c->cur_frame == 0;
00257
00258 if(keyframe){
00259 memset(c->Q, 0, sizeof(c->Q));
00260 c->last_bits_used = 0;
00261 }
00262 init_get_bits(gb, buf, buf_size * 8);
00263 skip_bits(gb, c->last_bits_used & 7);
00264
00265 if(keyframe)
00266 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
00267 else{
00268 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
00269 if(maxband > 32) maxband -= 33;
00270 }
00271 if(maxband > c->maxbands)
00272 return AVERROR_INVALIDDATA;
00273 c->last_max_band = maxband;
00274
00275
00276 if(maxband){
00277 last[0] = last[1] = 0;
00278 for(i = maxband - 1; i >= 0; i--){
00279 for(ch = 0; ch < 2; ch++){
00280 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
00281 if(last[ch] > 15) last[ch] -= 17;
00282 bands[i].res[ch] = last[ch];
00283 }
00284 }
00285 if(c->MSS){
00286 int mask;
00287
00288 cnt = 0;
00289 for(i = 0; i < maxband; i++)
00290 if(bands[i].res[0] || bands[i].res[1])
00291 cnt++;
00292 t = mpc8_get_mod_golomb(gb, cnt);
00293 mask = mpc8_get_mask(gb, cnt, t);
00294 for(i = maxband - 1; i >= 0; i--)
00295 if(bands[i].res[0] || bands[i].res[1]){
00296 bands[i].msf = mask & 1;
00297 mask >>= 1;
00298 }
00299 }
00300 }
00301 for(i = maxband; i < c->maxbands; i++)
00302 bands[i].res[0] = bands[i].res[1] = 0;
00303
00304 if(keyframe){
00305 for(i = 0; i < 32; i++)
00306 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
00307 }
00308
00309 for(i = 0; i < maxband; i++){
00310 if(bands[i].res[0] || bands[i].res[1]){
00311 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
00312 if(cnt >= 0){
00313 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
00314 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
00315 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
00316 }
00317 }
00318 }
00319
00320 for(i = 0; i < maxband; i++){
00321 for(ch = 0; ch < 2; ch++){
00322 if(!bands[i].res[ch]) continue;
00323
00324 if(c->oldDSCF[ch][i]){
00325 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
00326 c->oldDSCF[ch][i] = 0;
00327 }else{
00328 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
00329 if(t == 64)
00330 t += get_bits(gb, 6);
00331 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
00332 }
00333 for(j = 0; j < 2; j++){
00334 if((bands[i].scfi[ch] << j) & 2)
00335 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
00336 else{
00337 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
00338 if(t == 31)
00339 t = 64 + get_bits(gb, 6);
00340 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
00341 }
00342 }
00343 }
00344 }
00345
00346 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
00347 for(ch = 0; ch < 2; ch++){
00348 res = bands[i].res[ch];
00349 switch(res){
00350 case -1:
00351 for(j = 0; j < SAMPLES_PER_BAND; j++)
00352 c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
00353 break;
00354 case 0:
00355 break;
00356 case 1:
00357 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
00358 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
00359 t = mpc8_get_mask(gb, 18, cnt);
00360 for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)
00361 c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;
00362 }
00363 break;
00364 case 2:
00365 cnt = 6;
00366 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
00367 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
00368 c->Q[ch][off + j + 0] = mpc8_idx50[t];
00369 c->Q[ch][off + j + 1] = mpc8_idx51[t];
00370 c->Q[ch][off + j + 2] = mpc8_idx52[t];
00371 cnt = (cnt >> 1) + mpc8_huffq2[t];
00372 }
00373 break;
00374 case 3:
00375 case 4:
00376 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
00377 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
00378 c->Q[ch][off + j + 1] = t >> 4;
00379 c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
00380 }
00381 break;
00382 case 5:
00383 case 6:
00384 case 7:
00385 case 8:
00386 cnt = 2 * mpc8_thres[res];
00387 for(j = 0; j < SAMPLES_PER_BAND; j++){
00388 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];
00389 c->Q[ch][off + j] = t;
00390 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
00391 }
00392 break;
00393 default:
00394 for(j = 0; j < SAMPLES_PER_BAND; j++){
00395 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
00396 if(res != 9){
00397 c->Q[ch][off + j] <<= res - 9;
00398 c->Q[ch][off + j] |= get_bits(gb, res - 9);
00399 }
00400 c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
00401 }
00402 }
00403 }
00404 }
00405
00406 ff_mpc_dequantize_and_synth(c, maxband, data, avctx->channels);
00407
00408 c->cur_frame++;
00409
00410 c->last_bits_used = get_bits_count(gb);
00411 if(c->cur_frame >= c->frames)
00412 c->cur_frame = 0;
00413 *data_size = out_size;
00414
00415 return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
00416 }
00417
00418 AVCodec ff_mpc8_decoder = {
00419 "mpc8",
00420 AVMEDIA_TYPE_AUDIO,
00421 CODEC_ID_MUSEPACK8,
00422 sizeof(MPCContext),
00423 mpc8_decode_init,
00424 NULL,
00425 NULL,
00426 mpc8_decode_frame,
00427 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
00428 };