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00028 #include "libavutil/channel_layout.h"
00029 #include "libavutil/lfg.h"
00030 #include "avcodec.h"
00031 #include "get_bits.h"
00032 #include "dsputil.h"
00033 #include "internal.h"
00034 #include "mpegaudiodsp.h"
00035
00036 #include "mpc.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 ff_dsputil_init(&c->dsp, avctx);
00123 ff_mpadsp_init(&c->mpadsp);
00124
00125 ff_mpc_init();
00126
00127 init_get_bits(&gb, avctx->extradata, 16);
00128
00129 skip_bits(&gb, 3);
00130 c->maxbands = get_bits(&gb, 5) + 1;
00131 if (c->maxbands >= BANDS) {
00132 av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
00133 return AVERROR_INVALIDDATA;
00134 }
00135 channels = get_bits(&gb, 4) + 1;
00136 if (channels > 2) {
00137 av_log_missing_feature(avctx, "Multichannel MPC SV8", 1);
00138 return AVERROR_PATCHWELCOME;
00139 }
00140 c->MSS = get_bits1(&gb);
00141 c->frames = 1 << (get_bits(&gb, 3) * 2);
00142
00143 avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
00144 avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
00145 avctx->channels = channels;
00146
00147 avcodec_get_frame_defaults(&c->frame);
00148 avctx->coded_frame = &c->frame;
00149
00150 if(vlc_initialized) return 0;
00151 av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
00152
00153 band_vlc.table = band_table;
00154 band_vlc.table_allocated = 542;
00155 init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
00156 mpc8_bands_bits, 1, 1,
00157 mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00158
00159 q1_vlc.table = q1_table;
00160 q1_vlc.table_allocated = 520;
00161 init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
00162 mpc8_q1_bits, 1, 1,
00163 mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00164 q9up_vlc.table = q9up_table;
00165 q9up_vlc.table_allocated = 524;
00166 init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
00167 mpc8_q9up_bits, 1, 1,
00168 mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00169
00170 scfi_vlc[0].table = scfi0_table;
00171 scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
00172 init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
00173 mpc8_scfi0_bits, 1, 1,
00174 mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00175 scfi_vlc[1].table = scfi1_table;
00176 scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
00177 init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
00178 mpc8_scfi1_bits, 1, 1,
00179 mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00180
00181 dscf_vlc[0].table = dscf0_table;
00182 dscf_vlc[0].table_allocated = 560;
00183 init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
00184 mpc8_dscf0_bits, 1, 1,
00185 mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00186 dscf_vlc[1].table = dscf1_table;
00187 dscf_vlc[1].table_allocated = 598;
00188 init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
00189 mpc8_dscf1_bits, 1, 1,
00190 mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
00191
00192 q3_vlc[0].table = q3_0_table;
00193 q3_vlc[0].table_allocated = 512;
00194 ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
00195 mpc8_q3_bits, 1, 1,
00196 mpc8_q3_codes, 1, 1,
00197 mpc8_q3_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
00198 q3_vlc[1].table = q3_1_table;
00199 q3_vlc[1].table_allocated = 516;
00200 ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
00201 mpc8_q4_bits, 1, 1,
00202 mpc8_q4_codes, 1, 1,
00203 mpc8_q4_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
00204
00205 for(i = 0; i < 2; i++){
00206 res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
00207 res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
00208 init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
00209 &mpc8_res_bits[i], 1, 1,
00210 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00211
00212 q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
00213 q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
00214 init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
00215 &mpc8_q2_bits[i], 1, 1,
00216 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00217
00218 quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
00219 quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
00220 init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
00221 &mpc8_q5_bits[i], 1, 1,
00222 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00223 quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
00224 quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
00225 init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
00226 &mpc8_q6_bits[i], 1, 1,
00227 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00228 quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
00229 quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
00230 init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
00231 &mpc8_q7_bits[i], 1, 1,
00232 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00233 quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
00234 quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
00235 init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
00236 &mpc8_q8_bits[i], 1, 1,
00237 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
00238 }
00239 vlc_initialized = 1;
00240
00241 return 0;
00242 }
00243
00244 static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
00245 int *got_frame_ptr, AVPacket *avpkt)
00246 {
00247 const uint8_t *buf = avpkt->data;
00248 int buf_size = avpkt->size;
00249 MPCContext *c = avctx->priv_data;
00250 GetBitContext gb2, *gb = &gb2;
00251 int i, j, k, ch, cnt, res, t;
00252 Band *bands = c->bands;
00253 int off;
00254 int maxband, keyframe;
00255 int last[2];
00256
00257
00258 c->frame.nb_samples = MPC_FRAME_SIZE;
00259 if ((res = ff_get_buffer(avctx, &c->frame)) < 0) {
00260 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00261 return res;
00262 }
00263
00264 keyframe = c->cur_frame == 0;
00265
00266 if(keyframe){
00267 memset(c->Q, 0, sizeof(c->Q));
00268 c->last_bits_used = 0;
00269 }
00270 init_get_bits(gb, buf, buf_size * 8);
00271 skip_bits(gb, c->last_bits_used & 7);
00272
00273 if(keyframe)
00274 maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
00275 else{
00276 maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
00277 if(maxband > 32) maxband -= 33;
00278 }
00279
00280 if(maxband > c->maxbands + 1) {
00281 av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
00282 return AVERROR_INVALIDDATA;
00283 }
00284 c->last_max_band = maxband;
00285
00286
00287 if(maxband){
00288 last[0] = last[1] = 0;
00289 for(i = maxband - 1; i >= 0; i--){
00290 for(ch = 0; ch < 2; ch++){
00291 last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
00292 if(last[ch] > 15) last[ch] -= 17;
00293 bands[i].res[ch] = last[ch];
00294 }
00295 }
00296 if(c->MSS){
00297 int mask;
00298
00299 cnt = 0;
00300 for(i = 0; i < maxband; i++)
00301 if(bands[i].res[0] || bands[i].res[1])
00302 cnt++;
00303 t = mpc8_get_mod_golomb(gb, cnt);
00304 mask = mpc8_get_mask(gb, cnt, t);
00305 for(i = maxband - 1; i >= 0; i--)
00306 if(bands[i].res[0] || bands[i].res[1]){
00307 bands[i].msf = mask & 1;
00308 mask >>= 1;
00309 }
00310 }
00311 }
00312 for(i = maxband; i < c->maxbands; i++)
00313 bands[i].res[0] = bands[i].res[1] = 0;
00314
00315 if(keyframe){
00316 for(i = 0; i < 32; i++)
00317 c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
00318 }
00319
00320 for(i = 0; i < maxband; i++){
00321 if(bands[i].res[0] || bands[i].res[1]){
00322 cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
00323 if(cnt >= 0){
00324 t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
00325 if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
00326 if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
00327 }
00328 }
00329 }
00330
00331 for(i = 0; i < maxband; i++){
00332 for(ch = 0; ch < 2; ch++){
00333 if(!bands[i].res[ch]) continue;
00334
00335 if(c->oldDSCF[ch][i]){
00336 bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
00337 c->oldDSCF[ch][i] = 0;
00338 }else{
00339 t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
00340 if(t == 64)
00341 t += get_bits(gb, 6);
00342 bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
00343 }
00344 for(j = 0; j < 2; j++){
00345 if((bands[i].scfi[ch] << j) & 2)
00346 bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
00347 else{
00348 t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
00349 if(t == 31)
00350 t = 64 + get_bits(gb, 6);
00351 bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
00352 }
00353 }
00354 }
00355 }
00356
00357 for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
00358 for(ch = 0; ch < 2; ch++){
00359 res = bands[i].res[ch];
00360 switch(res){
00361 case -1:
00362 for(j = 0; j < SAMPLES_PER_BAND; j++)
00363 c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
00364 break;
00365 case 0:
00366 break;
00367 case 1:
00368 for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
00369 cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
00370 t = mpc8_get_mask(gb, 18, cnt);
00371 for(k = 0; k < SAMPLES_PER_BAND / 2; k++, t <<= 1)
00372 c->Q[ch][off + j + k] = (t & 0x20000) ? (get_bits1(gb) << 1) - 1 : 0;
00373 }
00374 break;
00375 case 2:
00376 cnt = 6;
00377 for(j = 0; j < SAMPLES_PER_BAND; j += 3){
00378 t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
00379 c->Q[ch][off + j + 0] = mpc8_idx50[t];
00380 c->Q[ch][off + j + 1] = mpc8_idx51[t];
00381 c->Q[ch][off + j + 2] = mpc8_idx52[t];
00382 cnt = (cnt >> 1) + mpc8_huffq2[t];
00383 }
00384 break;
00385 case 3:
00386 case 4:
00387 for(j = 0; j < SAMPLES_PER_BAND; j += 2){
00388 t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
00389 c->Q[ch][off + j + 1] = t >> 4;
00390 c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
00391 }
00392 break;
00393 case 5:
00394 case 6:
00395 case 7:
00396 case 8:
00397 cnt = 2 * mpc8_thres[res];
00398 for(j = 0; j < SAMPLES_PER_BAND; j++){
00399 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];
00400 c->Q[ch][off + j] = t;
00401 cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
00402 }
00403 break;
00404 default:
00405 for(j = 0; j < SAMPLES_PER_BAND; j++){
00406 c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
00407 if(res != 9){
00408 c->Q[ch][off + j] <<= res - 9;
00409 c->Q[ch][off + j] |= get_bits(gb, res - 9);
00410 }
00411 c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
00412 }
00413 }
00414 }
00415 }
00416
00417 ff_mpc_dequantize_and_synth(c, maxband - 1,
00418 (int16_t **)c->frame.extended_data,
00419 avctx->channels);
00420
00421 c->cur_frame++;
00422
00423 c->last_bits_used = get_bits_count(gb);
00424 if(get_bits_left(gb) < 8)
00425 c->last_bits_used = buf_size << 3;
00426 if(c->cur_frame >= c->frames)
00427 c->cur_frame = 0;
00428
00429 *got_frame_ptr = 1;
00430 *(AVFrame *)data = c->frame;
00431
00432 return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
00433 }
00434
00435 static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
00436 {
00437 MPCContext *c = avctx->priv_data;
00438 c->cur_frame = 0;
00439 }
00440
00441 AVCodec ff_mpc8_decoder = {
00442 .name = "mpc8",
00443 .type = AVMEDIA_TYPE_AUDIO,
00444 .id = AV_CODEC_ID_MUSEPACK8,
00445 .priv_data_size = sizeof(MPCContext),
00446 .init = mpc8_decode_init,
00447 .decode = mpc8_decode_frame,
00448 .flush = mpc8_decode_flush,
00449 .capabilities = CODEC_CAP_DR1,
00450 .long_name = NULL_IF_CONFIG_SMALL("Musepack SV8"),
00451 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
00452 AV_SAMPLE_FMT_NONE },
00453 };
