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00028 #include "libavutil/lfg.h"
00029 #include "avcodec.h"
00030 #include "get_bits.h"
00031 #include "dsputil.h"
00032 #include "mpegaudio.h"
00033 #include "libavutil/audioconvert.h"
00034
00035 #include "mpc.h"
00036 #include "mpcdata.h"
00037 #include "mpc8data.h"
00038 #include "mpc8huff.h"
00039
00040 static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
00041 static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
00042
00043 static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET };
00044 static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET };
00045
00046 static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
00047 {
00048 int len = mpc8_cnk_len[k-1][n-1] - 1;
00049 int code = len ? get_bits_long(gb, len) : 0;
00050
00051 if (code >= mpc8_cnk_lost[k-1][n-1])
00052 code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
00053
00054 return code;
00055 }
00056
00057 static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
00058 {
00059 int bits = 0;
00060 const uint32_t * C = mpc8_cnk[k-1];
00061 int code = mpc8_dec_base(gb, k, n);
00062
00063 do {
00064 n--;
00065 if (code >= C[n]) {
00066 bits |= 1 << n;
00067 code -= C[n];
00068 C -= 32;
00069 k--;
00070 }
00071 } while(k > 0);
00072
00073 return bits;
00074 }
00075
00076 static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
00077 {
00078 if(mpc8_cnk_len[0][m] < 1) return 0;
00079 return mpc8_dec_base(gb, 1, m+1);
00080 }
00081
00082 static int mpc8_get_mask(GetBitContext *gb, int size, int t)
00083 {
00084 int mask = 0;
00085
00086 if(t && t != size)
00087 mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
00088 if((t << 1) > size) mask = ~mask;
00089
00090 return mask;
00091 }
00092
00093 static const uint16_t vlc_offsets[13] = {
00094 0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708
00095 };
00096
00097 static av_cold int mpc8_decode_init(AVCodecContext * avctx)
00098 {
00099 int i;
00100 MPCContext *c = avctx->priv_data;
00101 GetBitContext gb;
00102 static int vlc_initialized = 0;
00103 int channels;
00104
00105 static VLC_TYPE band_table[542][2];
00106 static VLC_TYPE q1_table[520][2];
00107 static VLC_TYPE q9up_table[524][2];
00108 static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2];
00109 static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2];
00110 static VLC_TYPE dscf0_table[560][2];
00111 static VLC_TYPE dscf1_table[598][2];
00112 static VLC_TYPE q3_0_table[512][2];
00113 static VLC_TYPE q3_1_table[516][2];
00114 static VLC_TYPE codes_table[5708][2];
00115
00116 if(avctx->extradata_size < 2){
00117 av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
00118 return -1;
00119 }
00120 memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
00121 av_lfg_init(&c->rnd, 0xDEADBEEF);
00122 dsputil_init(&c->dsp, avctx);
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 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;
00245 int maxband, keyframe;
00246 int last[2];
00247
00248 keyframe = c->cur_frame == 0;
00249
00250 if(keyframe){
00251 memset(c->Q, 0, sizeof(c->Q));
00252 c->last_bits_used = 0;
00253 }
00254 init_get_bits(gb, buf, buf_size * 8);
00255 skip_bits(gb, c->last_bits_used & 7);
00256
00257 if(keyframe)
00258 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
00259 else{
00260 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
00261 if(maxband > 32) maxband -= 33;
00262 }
00263 c->last_max_band = maxband;
00264
00265
00266 if(maxband){
00267 last[0] = last[1] = 0;
00268 for(i = maxband - 1; i >= 0; i--){
00269 for(ch = 0; ch < 2; ch++){
00270 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
00271 if(last[ch] > 15) last[ch] -= 17;
00272 bands[i].res[ch] = last[ch];
00273 }
00274 }
00275 if(c->MSS){
00276 int mask;
00277
00278 cnt = 0;
00279 for(i = 0; i < maxband; i++)
00280 if(bands[i].res[0] || bands[i].res[1])
00281 cnt++;
00282 t = mpc8_get_mod_golomb(gb, cnt);
00283 mask = mpc8_get_mask(gb, cnt, t);
00284 for(i = maxband - 1; i >= 0; i--)
00285 if(bands[i].res[0] || bands[i].res[1]){
00286 bands[i].msf = mask & 1;
00287 mask >>= 1;
00288 }
00289 }
00290 }
00291 for(i = maxband; i < c->maxbands; i++)
00292 bands[i].res[0] = bands[i].res[1] = 0;
00293
00294 if(keyframe){
00295 for(i = 0; i < 32; i++)
00296 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
00297 }
00298
00299 for(i = 0; i < maxband; i++){
00300 if(bands[i].res[0] || bands[i].res[1]){
00301 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
00302 if(cnt >= 0){
00303 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
00304 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
00305 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
00306 }
00307 }
00308 }
00309
00310 for(i = 0; i < maxband; i++){
00311 for(ch = 0; ch < 2; ch++){
00312 if(!bands[i].res[ch]) continue;
00313
00314 if(c->oldDSCF[ch][i]){
00315 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
00316 c->oldDSCF[ch][i] = 0;
00317 }else{
00318 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
00319 if(t == 64)
00320 t += get_bits(gb, 6);
00321 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
00322 }
00323 for(j = 0; j < 2; j++){
00324 if((bands[i].scfi[ch] << j) & 2)
00325 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
00326 else{
00327 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
00328 if(t == 31)
00329 t = 64 + get_bits(gb, 6);
00330 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
00331 }
00332 }
00333 }
00334 }
00335
00336 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
00337 for(ch = 0; ch < 2; ch++){
00338 res = bands[i].res[ch];
00339 switch(res){
00340 case -1:
00341 for(j = 0; j < SAMPLES_PER_BAND; j++)
00342 c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
00343 break;
00344 case 0:
00345 break;
00346 case 1:
00347 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
00348 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
00349 t = mpc8_get_mask(gb, 18, cnt);
00350 for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)
00351 c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;
00352 }
00353 break;
00354 case 2:
00355 cnt = 6;
00356 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
00357 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
00358 c->Q[ch][off + j + 0] = mpc8_idx50[t];
00359 c->Q[ch][off + j + 1] = mpc8_idx51[t];
00360 c->Q[ch][off + j + 2] = mpc8_idx52[t];
00361 cnt = (cnt >> 1) + mpc8_huffq2[t];
00362 }
00363 break;
00364 case 3:
00365 case 4:
00366 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
00367 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
00368 c->Q[ch][off + j + 1] = t >> 4;
00369 c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
00370 }
00371 break;
00372 case 5:
00373 case 6:
00374 case 7:
00375 case 8:
00376 cnt = 2 * mpc8_thres[res];
00377 for(j = 0; j < SAMPLES_PER_BAND; j++){
00378 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];
00379 c->Q[ch][off + j] = t;
00380 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
00381 }
00382 break;
00383 default:
00384 for(j = 0; j < SAMPLES_PER_BAND; j++){
00385 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
00386 if(res != 9){
00387 c->Q[ch][off + j] <<= res - 9;
00388 c->Q[ch][off + j] |= get_bits(gb, res - 9);
00389 }
00390 c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
00391 }
00392 }
00393 }
00394 }
00395
00396 ff_mpc_dequantize_and_synth(c, maxband, data, avctx->channels);
00397
00398 c->cur_frame++;
00399
00400 c->last_bits_used = get_bits_count(gb);
00401 if(c->cur_frame >= c->frames)
00402 c->cur_frame = 0;
00403 *data_size = MPC_FRAME_SIZE * 2 * avctx->channels;
00404
00405 return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
00406 }
00407
00408 AVCodec ff_mpc8_decoder = {
00409 "mpc8",
00410 AVMEDIA_TYPE_AUDIO,
00411 CODEC_ID_MUSEPACK8,
00412 sizeof(MPCContext),
00413 mpc8_decode_init,
00414 NULL,
00415 NULL,
00416 mpc8_decode_frame,
00417 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
00418 };