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00029 #include <math.h>
00030 #include <stddef.h>
00031 #include <stdio.h>
00032
00033 #include "avcodec.h"
00034 #include "dsputil.h"
00035 #include "bitstream.h"
00036 #include "dcadata.h"
00037 #include "dcahuff.h"
00038 #include "dca.h"
00039
00040
00041
00042 #define DCA_PRIM_CHANNELS_MAX (5)
00043 #define DCA_SUBBANDS (32)
00044 #define DCA_ABITS_MAX (32)
00045 #define DCA_SUBSUBFAMES_MAX (4)
00046 #define DCA_LFE_MAX (3)
00047
00048 enum DCAMode {
00049 DCA_MONO = 0,
00050 DCA_CHANNEL,
00051 DCA_STEREO,
00052 DCA_STEREO_SUMDIFF,
00053 DCA_STEREO_TOTAL,
00054 DCA_3F,
00055 DCA_2F1R,
00056 DCA_3F1R,
00057 DCA_2F2R,
00058 DCA_3F2R,
00059 DCA_4F2R
00060 };
00061
00062
00063
00064
00065
00066
00067
00068
00069
00070
00071
00072 static const int64_t dca_core_channel_layout[] = {
00073 CH_FRONT_CENTER,
00074 CH_LAYOUT_STEREO,
00075 CH_LAYOUT_STEREO,
00076 CH_LAYOUT_STEREO,
00077 CH_LAYOUT_STEREO,
00078 CH_LAYOUT_STEREO|CH_FRONT_CENTER,
00079 CH_LAYOUT_STEREO|CH_BACK_CENTER,
00080 CH_LAYOUT_STEREO|CH_FRONT_CENTER|CH_BACK_CENTER,
00081 CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT,
00082 CH_LAYOUT_STEREO|CH_FRONT_CENTER|CH_SIDE_LEFT|CH_SIDE_RIGHT,
00083 CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT|CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER,
00084 CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT|CH_FRONT_CENTER|CH_BACK_CENTER,
00085 CH_FRONT_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_FRONT_LEFT_OF_CENTER|CH_BACK_CENTER|CH_BACK_LEFT|CH_BACK_RIGHT,
00086 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT,
00087 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT|CH_BACK_LEFT|CH_BACK_RIGHT,
00088 CH_FRONT_LEFT_OF_CENTER|CH_FRONT_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_BACK_CENTER|CH_SIDE_RIGHT,
00089 };
00090
00091 static const int8_t dca_lfe_index[] = {
00092 1,2,2,2,2,3,2,3,2,3,2,3,1,3,2,3
00093 };
00094
00095 static const int8_t dca_channel_reorder_lfe[][8] = {
00096 { 0, -1, -1, -1, -1, -1, -1, -1},
00097 { 0, 1, -1, -1, -1, -1, -1, -1},
00098 { 0, 1, -1, -1, -1, -1, -1, -1},
00099 { 0, 1, -1, -1, -1, -1, -1, -1},
00100 { 0, 1, -1, -1, -1, -1, -1, -1},
00101 { 2, 0, 1, -1, -1, -1, -1, -1},
00102 { 0, 1, 3, -1, -1, -1, -1, -1},
00103 { 2, 0, 1, 4, -1, -1, -1, -1},
00104 { 0, 1, 3, 4, -1, -1, -1, -1},
00105 { 2, 0, 1, 4, 5, -1, -1, -1},
00106 { 3, 4, 0, 1, 5, 6, -1, -1},
00107 { 2, 0, 1, 4, 5, 6, -1, -1},
00108 { 0, 6, 4, 5, 2, 3, -1, -1},
00109 { 4, 2, 5, 0, 1, 6, 7, -1},
00110 { 5, 6, 0, 1, 7, 3, 8, 4},
00111 { 4, 2, 5, 0, 1, 6, 8, 7},
00112 };
00113
00114 static const int8_t dca_channel_reorder_nolfe[][8] = {
00115 { 0, -1, -1, -1, -1, -1, -1, -1},
00116 { 0, 1, -1, -1, -1, -1, -1, -1},
00117 { 0, 1, -1, -1, -1, -1, -1, -1},
00118 { 0, 1, -1, -1, -1, -1, -1, -1},
00119 { 0, 1, -1, -1, -1, -1, -1, -1},
00120 { 2, 0, 1, -1, -1, -1, -1, -1},
00121 { 0, 1, 2, -1, -1, -1, -1, -1},
00122 { 2, 0, 1, 3, -1, -1, -1, -1},
00123 { 0, 1, 2, 3, -1, -1, -1, -1},
00124 { 2, 0, 1, 3, 4, -1, -1, -1},
00125 { 2, 3, 0, 1, 4, 5, -1, -1},
00126 { 2, 0, 1, 3, 4, 5, -1, -1},
00127 { 0, 5, 3, 4, 1, 2, -1, -1},
00128 { 3, 2, 4, 0, 1, 5, 6, -1},
00129 { 4, 5, 0, 1, 6, 2, 7, 3},
00130 { 3, 2, 4, 0, 1, 5, 7, 6},
00131 };
00132
00133
00134 #define DCA_DOLBY 101
00135
00136 #define DCA_CHANNEL_BITS 6
00137 #define DCA_CHANNEL_MASK 0x3F
00138
00139 #define DCA_LFE 0x80
00140
00141 #define HEADER_SIZE 14
00142
00143 #define DCA_MAX_FRAME_SIZE 16384
00144
00146 typedef struct {
00147 int offset;
00148 int maxbits[8];
00149 int wrap;
00150 VLC vlc[8];
00151 } BitAlloc;
00152
00153 static BitAlloc dca_bitalloc_index;
00154 static BitAlloc dca_tmode;
00155 static BitAlloc dca_scalefactor;
00156 static BitAlloc dca_smpl_bitalloc[11];
00157
00158 static av_always_inline int get_bitalloc(GetBitContext *gb, BitAlloc *ba, int idx)
00159 {
00160 return get_vlc2(gb, ba->vlc[idx].table, ba->vlc[idx].bits, ba->wrap) + ba->offset;
00161 }
00162
00163 typedef struct {
00164 AVCodecContext *avctx;
00165
00166 int frame_type;
00167 int samples_deficit;
00168 int crc_present;
00169 int sample_blocks;
00170 int frame_size;
00171 int amode;
00172 int sample_rate;
00173 int bit_rate;
00174 int bit_rate_index;
00175
00176 int downmix;
00177 int dynrange;
00178 int timestamp;
00179 int aux_data;
00180 int hdcd;
00181 int ext_descr;
00182 int ext_coding;
00183 int aspf;
00184 int lfe;
00185 int predictor_history;
00186 int header_crc;
00187 int multirate_inter;
00188 int version;
00189 int copy_history;
00190 int source_pcm_res;
00191 int front_sum;
00192 int surround_sum;
00193 int dialog_norm;
00194
00195
00196 int subframes;
00197 int total_channels;
00198 int prim_channels;
00199 int subband_activity[DCA_PRIM_CHANNELS_MAX];
00200 int vq_start_subband[DCA_PRIM_CHANNELS_MAX];
00201 int joint_intensity[DCA_PRIM_CHANNELS_MAX];
00202 int transient_huffman[DCA_PRIM_CHANNELS_MAX];
00203 int scalefactor_huffman[DCA_PRIM_CHANNELS_MAX];
00204 int bitalloc_huffman[DCA_PRIM_CHANNELS_MAX];
00205 int quant_index_huffman[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX];
00206 float scalefactor_adj[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX];
00207
00208
00209 int subsubframes;
00210 int partial_samples;
00211 int prediction_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];
00212 int prediction_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];
00213 int bitalloc[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];
00214 int transition_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];
00215 int scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][2];
00216 int joint_huff[DCA_PRIM_CHANNELS_MAX];
00217 int joint_scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];
00218 int downmix_coef[DCA_PRIM_CHANNELS_MAX][2];
00219 int dynrange_coef;
00220
00221 int high_freq_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];
00222
00223 float lfe_data[2 * DCA_SUBSUBFAMES_MAX * DCA_LFE_MAX *
00224 2 ];
00225 int lfe_scale_factor;
00226
00227
00228 float subband_samples_hist[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][4];
00229 DECLARE_ALIGNED_16(float, subband_fir_hist[DCA_PRIM_CHANNELS_MAX][512]);
00230 float subband_fir_noidea[DCA_PRIM_CHANNELS_MAX][32];
00231 int hist_index[DCA_PRIM_CHANNELS_MAX];
00232
00233 int output;
00234 float add_bias;
00235 float scale_bias;
00236
00237 DECLARE_ALIGNED_16(float, samples[1536]);
00238 const float *samples_chanptr[6];
00239
00240 uint8_t dca_buffer[DCA_MAX_FRAME_SIZE];
00241 int dca_buffer_size;
00242
00243 const int8_t* channel_order_tab;
00244 GetBitContext gb;
00245
00246 int current_subframe;
00247 int current_subsubframe;
00248
00249 int debug_flag;
00250 DSPContext dsp;
00251 MDCTContext imdct;
00252 } DCAContext;
00253
00254 static av_cold void dca_init_vlcs(void)
00255 {
00256 static int vlcs_initialized = 0;
00257 int i, j;
00258
00259 if (vlcs_initialized)
00260 return;
00261
00262 dca_bitalloc_index.offset = 1;
00263 dca_bitalloc_index.wrap = 2;
00264 for (i = 0; i < 5; i++)
00265 init_vlc(&dca_bitalloc_index.vlc[i], bitalloc_12_vlc_bits[i], 12,
00266 bitalloc_12_bits[i], 1, 1,
00267 bitalloc_12_codes[i], 2, 2, 1);
00268 dca_scalefactor.offset = -64;
00269 dca_scalefactor.wrap = 2;
00270 for (i = 0; i < 5; i++)
00271 init_vlc(&dca_scalefactor.vlc[i], SCALES_VLC_BITS, 129,
00272 scales_bits[i], 1, 1,
00273 scales_codes[i], 2, 2, 1);
00274 dca_tmode.offset = 0;
00275 dca_tmode.wrap = 1;
00276 for (i = 0; i < 4; i++)
00277 init_vlc(&dca_tmode.vlc[i], tmode_vlc_bits[i], 4,
00278 tmode_bits[i], 1, 1,
00279 tmode_codes[i], 2, 2, 1);
00280
00281 for(i = 0; i < 10; i++)
00282 for(j = 0; j < 7; j++){
00283 if(!bitalloc_codes[i][j]) break;
00284 dca_smpl_bitalloc[i+1].offset = bitalloc_offsets[i];
00285 dca_smpl_bitalloc[i+1].wrap = 1 + (j > 4);
00286 init_vlc(&dca_smpl_bitalloc[i+1].vlc[j], bitalloc_maxbits[i][j],
00287 bitalloc_sizes[i],
00288 bitalloc_bits[i][j], 1, 1,
00289 bitalloc_codes[i][j], 2, 2, 1);
00290 }
00291 vlcs_initialized = 1;
00292 }
00293
00294 static inline void get_array(GetBitContext *gb, int *dst, int len, int bits)
00295 {
00296 while(len--)
00297 *dst++ = get_bits(gb, bits);
00298 }
00299
00300 static int dca_parse_frame_header(DCAContext * s)
00301 {
00302 int i, j;
00303 static const float adj_table[4] = { 1.0, 1.1250, 1.2500, 1.4375 };
00304 static const int bitlen[11] = { 0, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3 };
00305 static const int thr[11] = { 0, 1, 3, 3, 3, 3, 7, 7, 7, 7, 7 };
00306
00307 init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);
00308
00309
00310 get_bits(&s->gb, 32);
00311
00312
00313 s->frame_type = get_bits(&s->gb, 1);
00314 s->samples_deficit = get_bits(&s->gb, 5) + 1;
00315 s->crc_present = get_bits(&s->gb, 1);
00316 s->sample_blocks = get_bits(&s->gb, 7) + 1;
00317 s->frame_size = get_bits(&s->gb, 14) + 1;
00318 if (s->frame_size < 95)
00319 return -1;
00320 s->amode = get_bits(&s->gb, 6);
00321 s->sample_rate = dca_sample_rates[get_bits(&s->gb, 4)];
00322 if (!s->sample_rate)
00323 return -1;
00324 s->bit_rate_index = get_bits(&s->gb, 5);
00325 s->bit_rate = dca_bit_rates[s->bit_rate_index];
00326 if (!s->bit_rate)
00327 return -1;
00328
00329 s->downmix = get_bits(&s->gb, 1);
00330 s->dynrange = get_bits(&s->gb, 1);
00331 s->timestamp = get_bits(&s->gb, 1);
00332 s->aux_data = get_bits(&s->gb, 1);
00333 s->hdcd = get_bits(&s->gb, 1);
00334 s->ext_descr = get_bits(&s->gb, 3);
00335 s->ext_coding = get_bits(&s->gb, 1);
00336 s->aspf = get_bits(&s->gb, 1);
00337 s->lfe = get_bits(&s->gb, 2);
00338 s->predictor_history = get_bits(&s->gb, 1);
00339
00340
00341 if (s->crc_present)
00342 s->header_crc = get_bits(&s->gb, 16);
00343
00344 s->multirate_inter = get_bits(&s->gb, 1);
00345 s->version = get_bits(&s->gb, 4);
00346 s->copy_history = get_bits(&s->gb, 2);
00347 s->source_pcm_res = get_bits(&s->gb, 3);
00348 s->front_sum = get_bits(&s->gb, 1);
00349 s->surround_sum = get_bits(&s->gb, 1);
00350 s->dialog_norm = get_bits(&s->gb, 4);
00351
00352
00353 s->output = s->amode;
00354 if(s->lfe) s->output |= DCA_LFE;
00355
00356 #ifdef TRACE
00357 av_log(s->avctx, AV_LOG_DEBUG, "frame type: %i\n", s->frame_type);
00358 av_log(s->avctx, AV_LOG_DEBUG, "samples deficit: %i\n", s->samples_deficit);
00359 av_log(s->avctx, AV_LOG_DEBUG, "crc present: %i\n", s->crc_present);
00360 av_log(s->avctx, AV_LOG_DEBUG, "sample blocks: %i (%i samples)\n",
00361 s->sample_blocks, s->sample_blocks * 32);
00362 av_log(s->avctx, AV_LOG_DEBUG, "frame size: %i bytes\n", s->frame_size);
00363 av_log(s->avctx, AV_LOG_DEBUG, "amode: %i (%i channels)\n",
00364 s->amode, dca_channels[s->amode]);
00365 av_log(s->avctx, AV_LOG_DEBUG, "sample rate: %i Hz\n",
00366 s->sample_rate);
00367 av_log(s->avctx, AV_LOG_DEBUG, "bit rate: %i bits/s\n",
00368 s->bit_rate);
00369 av_log(s->avctx, AV_LOG_DEBUG, "downmix: %i\n", s->downmix);
00370 av_log(s->avctx, AV_LOG_DEBUG, "dynrange: %i\n", s->dynrange);
00371 av_log(s->avctx, AV_LOG_DEBUG, "timestamp: %i\n", s->timestamp);
00372 av_log(s->avctx, AV_LOG_DEBUG, "aux_data: %i\n", s->aux_data);
00373 av_log(s->avctx, AV_LOG_DEBUG, "hdcd: %i\n", s->hdcd);
00374 av_log(s->avctx, AV_LOG_DEBUG, "ext descr: %i\n", s->ext_descr);
00375 av_log(s->avctx, AV_LOG_DEBUG, "ext coding: %i\n", s->ext_coding);
00376 av_log(s->avctx, AV_LOG_DEBUG, "aspf: %i\n", s->aspf);
00377 av_log(s->avctx, AV_LOG_DEBUG, "lfe: %i\n", s->lfe);
00378 av_log(s->avctx, AV_LOG_DEBUG, "predictor history: %i\n",
00379 s->predictor_history);
00380 av_log(s->avctx, AV_LOG_DEBUG, "header crc: %i\n", s->header_crc);
00381 av_log(s->avctx, AV_LOG_DEBUG, "multirate inter: %i\n",
00382 s->multirate_inter);
00383 av_log(s->avctx, AV_LOG_DEBUG, "version number: %i\n", s->version);
00384 av_log(s->avctx, AV_LOG_DEBUG, "copy history: %i\n", s->copy_history);
00385 av_log(s->avctx, AV_LOG_DEBUG,
00386 "source pcm resolution: %i (%i bits/sample)\n",
00387 s->source_pcm_res, dca_bits_per_sample[s->source_pcm_res]);
00388 av_log(s->avctx, AV_LOG_DEBUG, "front sum: %i\n", s->front_sum);
00389 av_log(s->avctx, AV_LOG_DEBUG, "surround sum: %i\n", s->surround_sum);
00390 av_log(s->avctx, AV_LOG_DEBUG, "dialog norm: %i\n", s->dialog_norm);
00391 av_log(s->avctx, AV_LOG_DEBUG, "\n");
00392 #endif
00393
00394
00395 s->subframes = get_bits(&s->gb, 4) + 1;
00396 s->total_channels = get_bits(&s->gb, 3) + 1;
00397 s->prim_channels = s->total_channels;
00398 if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)
00399 s->prim_channels = DCA_PRIM_CHANNELS_MAX;
00400
00401
00402 for (i = 0; i < s->prim_channels; i++) {
00403 s->subband_activity[i] = get_bits(&s->gb, 5) + 2;
00404 if (s->subband_activity[i] > DCA_SUBBANDS)
00405 s->subband_activity[i] = DCA_SUBBANDS;
00406 }
00407 for (i = 0; i < s->prim_channels; i++) {
00408 s->vq_start_subband[i] = get_bits(&s->gb, 5) + 1;
00409 if (s->vq_start_subband[i] > DCA_SUBBANDS)
00410 s->vq_start_subband[i] = DCA_SUBBANDS;
00411 }
00412 get_array(&s->gb, s->joint_intensity, s->prim_channels, 3);
00413 get_array(&s->gb, s->transient_huffman, s->prim_channels, 2);
00414 get_array(&s->gb, s->scalefactor_huffman, s->prim_channels, 3);
00415 get_array(&s->gb, s->bitalloc_huffman, s->prim_channels, 3);
00416
00417
00418 memset(s->quant_index_huffman, 0, sizeof(s->quant_index_huffman));
00419 for (j = 1; j < 11; j++)
00420 for (i = 0; i < s->prim_channels; i++)
00421 s->quant_index_huffman[i][j] = get_bits(&s->gb, bitlen[j]);
00422
00423
00424 for (j = 0; j < 11; j++)
00425 for (i = 0; i < s->prim_channels; i++)
00426 s->scalefactor_adj[i][j] = 1;
00427
00428 for (j = 1; j < 11; j++)
00429 for (i = 0; i < s->prim_channels; i++)
00430 if (s->quant_index_huffman[i][j] < thr[j])
00431 s->scalefactor_adj[i][j] = adj_table[get_bits(&s->gb, 2)];
00432
00433 if (s->crc_present) {
00434
00435 get_bits(&s->gb, 16);
00436 }
00437
00438 s->current_subframe = 0;
00439 s->current_subsubframe = 0;
00440
00441 #ifdef TRACE
00442 av_log(s->avctx, AV_LOG_DEBUG, "subframes: %i\n", s->subframes);
00443 av_log(s->avctx, AV_LOG_DEBUG, "prim channels: %i\n", s->prim_channels);
00444 for(i = 0; i < s->prim_channels; i++){
00445 av_log(s->avctx, AV_LOG_DEBUG, "subband activity: %i\n", s->subband_activity[i]);
00446 av_log(s->avctx, AV_LOG_DEBUG, "vq start subband: %i\n", s->vq_start_subband[i]);
00447 av_log(s->avctx, AV_LOG_DEBUG, "joint intensity: %i\n", s->joint_intensity[i]);
00448 av_log(s->avctx, AV_LOG_DEBUG, "transient mode codebook: %i\n", s->transient_huffman[i]);
00449 av_log(s->avctx, AV_LOG_DEBUG, "scale factor codebook: %i\n", s->scalefactor_huffman[i]);
00450 av_log(s->avctx, AV_LOG_DEBUG, "bit allocation quantizer: %i\n", s->bitalloc_huffman[i]);
00451 av_log(s->avctx, AV_LOG_DEBUG, "quant index huff:");
00452 for (j = 0; j < 11; j++)
00453 av_log(s->avctx, AV_LOG_DEBUG, " %i",
00454 s->quant_index_huffman[i][j]);
00455 av_log(s->avctx, AV_LOG_DEBUG, "\n");
00456 av_log(s->avctx, AV_LOG_DEBUG, "scalefac adj:");
00457 for (j = 0; j < 11; j++)
00458 av_log(s->avctx, AV_LOG_DEBUG, " %1.3f", s->scalefactor_adj[i][j]);
00459 av_log(s->avctx, AV_LOG_DEBUG, "\n");
00460 }
00461 #endif
00462
00463 return 0;
00464 }
00465
00466
00467 static inline int get_scale(GetBitContext *gb, int level, int value)
00468 {
00469 if (level < 5) {
00470
00471 value += get_bitalloc(gb, &dca_scalefactor, level);
00472 } else if(level < 8)
00473 value = get_bits(gb, level + 1);
00474 return value;
00475 }
00476
00477 static int dca_subframe_header(DCAContext * s)
00478 {
00479
00480 int j, k;
00481
00482 s->subsubframes = get_bits(&s->gb, 2) + 1;
00483 s->partial_samples = get_bits(&s->gb, 3);
00484 for (j = 0; j < s->prim_channels; j++) {
00485 for (k = 0; k < s->subband_activity[j]; k++)
00486 s->prediction_mode[j][k] = get_bits(&s->gb, 1);
00487 }
00488
00489
00490 for (j = 0; j < s->prim_channels; j++) {
00491 for (k = 0; k < s->subband_activity[j]; k++) {
00492 if (s->prediction_mode[j][k] > 0) {
00493
00494 s->prediction_vq[j][k] = get_bits(&s->gb, 12);
00495 }
00496 }
00497 }
00498
00499
00500 for (j = 0; j < s->prim_channels; j++) {
00501 for (k = 0; k < s->vq_start_subband[j]; k++) {
00502 if (s->bitalloc_huffman[j] == 6)
00503 s->bitalloc[j][k] = get_bits(&s->gb, 5);
00504 else if (s->bitalloc_huffman[j] == 5)
00505 s->bitalloc[j][k] = get_bits(&s->gb, 4);
00506 else if (s->bitalloc_huffman[j] == 7) {
00507 av_log(s->avctx, AV_LOG_ERROR,
00508 "Invalid bit allocation index\n");
00509 return -1;
00510 } else {
00511 s->bitalloc[j][k] =
00512 get_bitalloc(&s->gb, &dca_bitalloc_index, s->bitalloc_huffman[j]);
00513 }
00514
00515 if (s->bitalloc[j][k] > 26) {
00516
00517
00518 return -1;
00519 }
00520 }
00521 }
00522
00523
00524 for (j = 0; j < s->prim_channels; j++) {
00525 for (k = 0; k < s->subband_activity[j]; k++) {
00526 s->transition_mode[j][k] = 0;
00527 if (s->subsubframes > 1 &&
00528 k < s->vq_start_subband[j] && s->bitalloc[j][k] > 0) {
00529 s->transition_mode[j][k] =
00530 get_bitalloc(&s->gb, &dca_tmode, s->transient_huffman[j]);
00531 }
00532 }
00533 }
00534
00535 for (j = 0; j < s->prim_channels; j++) {
00536 const uint32_t *scale_table;
00537 int scale_sum;
00538
00539 memset(s->scale_factor[j], 0, s->subband_activity[j] * sizeof(s->scale_factor[0][0][0]) * 2);
00540
00541 if (s->scalefactor_huffman[j] == 6)
00542 scale_table = scale_factor_quant7;
00543 else
00544 scale_table = scale_factor_quant6;
00545
00546
00547 scale_sum = 0;
00548
00549 for (k = 0; k < s->subband_activity[j]; k++) {
00550 if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0) {
00551 scale_sum = get_scale(&s->gb, s->scalefactor_huffman[j], scale_sum);
00552 s->scale_factor[j][k][0] = scale_table[scale_sum];
00553 }
00554
00555 if (k < s->vq_start_subband[j] && s->transition_mode[j][k]) {
00556
00557 scale_sum = get_scale(&s->gb, s->scalefactor_huffman[j], scale_sum);
00558 s->scale_factor[j][k][1] = scale_table[scale_sum];
00559 }
00560 }
00561 }
00562
00563
00564 for (j = 0; j < s->prim_channels; j++) {
00565
00566 if (s->joint_intensity[j] > 0)
00567 s->joint_huff[j] = get_bits(&s->gb, 3);
00568 }
00569
00570
00571 for (j = 0; j < s->prim_channels; j++) {
00572 int source_channel;
00573
00574
00575 if (s->joint_intensity[j] > 0) {
00576 int scale = 0;
00577 source_channel = s->joint_intensity[j] - 1;
00578
00579
00580
00581
00582 for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++) {
00583 scale = get_scale(&s->gb, s->joint_huff[j], 0);
00584 scale += 64;
00585 s->joint_scale_factor[j][k] = scale;
00586 }
00587
00588 if (!s->debug_flag & 0x02) {
00589 av_log(s->avctx, AV_LOG_DEBUG,
00590 "Joint stereo coding not supported\n");
00591 s->debug_flag |= 0x02;
00592 }
00593 }
00594 }
00595
00596
00597 if (s->prim_channels > 2) {
00598 if(s->downmix) {
00599 for (j = 0; j < s->prim_channels; j++) {
00600 s->downmix_coef[j][0] = get_bits(&s->gb, 7);
00601 s->downmix_coef[j][1] = get_bits(&s->gb, 7);
00602 }
00603 } else {
00604 int am = s->amode & DCA_CHANNEL_MASK;
00605 for (j = 0; j < s->prim_channels; j++) {
00606 s->downmix_coef[j][0] = dca_default_coeffs[am][j][0];
00607 s->downmix_coef[j][1] = dca_default_coeffs[am][j][1];
00608 }
00609 }
00610 }
00611
00612
00613 if (s->dynrange)
00614 s->dynrange_coef = get_bits(&s->gb, 8);
00615
00616
00617 if (s->crc_present) {
00618 get_bits(&s->gb, 16);
00619 }
00620
00621
00622
00623
00624
00625
00626 for (j = 0; j < s->prim_channels; j++)
00627 for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)
00628
00629 s->high_freq_vq[j][k] = get_bits(&s->gb, 10);
00630
00631
00632 if (s->lfe) {
00633
00634 int lfe_samples = 2 * s->lfe * s->subsubframes;
00635 float lfe_scale;
00636
00637 for (j = lfe_samples; j < lfe_samples * 2; j++) {
00638
00639 s->lfe_data[j] = get_sbits(&s->gb, 8);
00640 }
00641
00642
00643 s->lfe_scale_factor = scale_factor_quant7[get_bits(&s->gb, 8)];
00644
00645
00646 lfe_scale = 0.035 * s->lfe_scale_factor;
00647
00648 for (j = lfe_samples; j < lfe_samples * 2; j++)
00649 s->lfe_data[j] *= lfe_scale;
00650 }
00651
00652 #ifdef TRACE
00653 av_log(s->avctx, AV_LOG_DEBUG, "subsubframes: %i\n", s->subsubframes);
00654 av_log(s->avctx, AV_LOG_DEBUG, "partial samples: %i\n",
00655 s->partial_samples);
00656 for (j = 0; j < s->prim_channels; j++) {
00657 av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");
00658 for (k = 0; k < s->subband_activity[j]; k++)
00659 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->prediction_mode[j][k]);
00660 av_log(s->avctx, AV_LOG_DEBUG, "\n");
00661 }
00662 for (j = 0; j < s->prim_channels; j++) {
00663 for (k = 0; k < s->subband_activity[j]; k++)
00664 av_log(s->avctx, AV_LOG_DEBUG,
00665 "prediction coefs: %f, %f, %f, %f\n",
00666 (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,
00667 (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,
00668 (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,
00669 (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);
00670 }
00671 for (j = 0; j < s->prim_channels; j++) {
00672 av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");
00673 for (k = 0; k < s->vq_start_subband[j]; k++)
00674 av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);
00675 av_log(s->avctx, AV_LOG_DEBUG, "\n");
00676 }
00677 for (j = 0; j < s->prim_channels; j++) {
00678 av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");
00679 for (k = 0; k < s->subband_activity[j]; k++)
00680 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->transition_mode[j][k]);
00681 av_log(s->avctx, AV_LOG_DEBUG, "\n");
00682 }
00683 for (j = 0; j < s->prim_channels; j++) {
00684 av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");
00685 for (k = 0; k < s->subband_activity[j]; k++) {
00686 if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)
00687 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);
00688 if (k < s->vq_start_subband[j] && s->transition_mode[j][k])
00689 av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);
00690 }
00691 av_log(s->avctx, AV_LOG_DEBUG, "\n");
00692 }
00693 for (j = 0; j < s->prim_channels; j++) {
00694 if (s->joint_intensity[j] > 0) {
00695 int source_channel = s->joint_intensity[j] - 1;
00696 av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");
00697 for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++)
00698 av_log(s->avctx, AV_LOG_DEBUG, " %i", s->joint_scale_factor[j][k]);
00699 av_log(s->avctx, AV_LOG_DEBUG, "\n");
00700 }
00701 }
00702 if (s->prim_channels > 2 && s->downmix) {
00703 av_log(s->avctx, AV_LOG_DEBUG, "Downmix coeffs:\n");
00704 for (j = 0; j < s->prim_channels; j++) {
00705 av_log(s->avctx, AV_LOG_DEBUG, "Channel 0,%d = %f\n", j, dca_downmix_coeffs[s->downmix_coef[j][0]]);
00706 av_log(s->avctx, AV_LOG_DEBUG, "Channel 1,%d = %f\n", j, dca_downmix_coeffs[s->downmix_coef[j][1]]);
00707 }
00708 av_log(s->avctx, AV_LOG_DEBUG, "\n");
00709 }
00710 for (j = 0; j < s->prim_channels; j++)
00711 for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)
00712 av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);
00713 if(s->lfe){
00714 int lfe_samples = 2 * s->lfe * s->subsubframes;
00715 av_log(s->avctx, AV_LOG_DEBUG, "LFE samples:\n");
00716 for (j = lfe_samples; j < lfe_samples * 2; j++)
00717 av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);
00718 av_log(s->avctx, AV_LOG_DEBUG, "\n");
00719 }
00720 #endif
00721
00722 return 0;
00723 }
00724
00725 static void qmf_32_subbands(DCAContext * s, int chans,
00726 float samples_in[32][8], float *samples_out,
00727 float scale, float bias)
00728 {
00729 const float *prCoeff;
00730 int i, j;
00731 DECLARE_ALIGNED_16(float, raXin[32]);
00732
00733 int hist_index= s->hist_index[chans];
00734 float *subband_fir_hist2 = s->subband_fir_noidea[chans];
00735
00736 int subindex;
00737
00738 scale *= sqrt(1/8.0);
00739
00740
00741 if (!s->multirate_inter)
00742 prCoeff = fir_32bands_nonperfect;
00743 else
00744 prCoeff = fir_32bands_perfect;
00745
00746
00747 for (subindex = 0; subindex < 8; subindex++) {
00748 float *subband_fir_hist = s->subband_fir_hist[chans] + hist_index;
00749
00750 for (i = 0; i < s->subband_activity[chans]; i++){
00751 if((i-1)&2) raXin[i] = -samples_in[i][subindex];
00752 else raXin[i] = samples_in[i][subindex];
00753 }
00754 for (; i < 32; i++)
00755 raXin[i] = 0.0;
00756
00757 ff_imdct_half(&s->imdct, subband_fir_hist, raXin);
00758
00759
00760 for (i = 0; i < 16; i++){
00761 float a= subband_fir_hist2[i ];
00762 float b= subband_fir_hist2[i+16];
00763 float c= 0;
00764 float d= 0;
00765 for (j = 0; j < 512-hist_index; j += 64){
00766 a += prCoeff[i+j ]*(-subband_fir_hist[15-i+j]);
00767 b += prCoeff[i+j+16]*( subband_fir_hist[ i+j]);
00768 c += prCoeff[i+j+32]*( subband_fir_hist[16+i+j]);
00769 d += prCoeff[i+j+48]*( subband_fir_hist[31-i+j]);
00770 }
00771 for ( ; j < 512; j += 64){
00772 a += prCoeff[i+j ]*(-subband_fir_hist[15-i+j-512]);
00773 b += prCoeff[i+j+16]*( subband_fir_hist[ i+j-512]);
00774 c += prCoeff[i+j+32]*( subband_fir_hist[16+i+j-512]);
00775 d += prCoeff[i+j+48]*( subband_fir_hist[31-i+j-512]);
00776 }
00777 samples_out[i ] = a * scale + bias;
00778 samples_out[i+16] = b * scale + bias;
00779 subband_fir_hist2[i ] = c;
00780 subband_fir_hist2[i+16] = d;
00781 }
00782 samples_out+= 32;
00783
00784 hist_index = (hist_index-32)&511;
00785 }
00786 s->hist_index[chans]= hist_index;
00787 }
00788
00789 static void lfe_interpolation_fir(int decimation_select,
00790 int num_deci_sample, float *samples_in,
00791 float *samples_out, float scale,
00792 float bias)
00793 {
00794
00795
00796
00797
00798
00799
00800
00801
00802 int decifactor, k, j;
00803 const float *prCoeff;
00804
00805 int interp_index = 0;
00806 int deciindex;
00807
00808
00809 if (decimation_select == 1) {
00810 decifactor = 128;
00811 prCoeff = lfe_fir_128;
00812 } else {
00813 decifactor = 64;
00814 prCoeff = lfe_fir_64;
00815 }
00816
00817 for (deciindex = 0; deciindex < num_deci_sample; deciindex++) {
00818
00819 for (k = 0; k < decifactor; k++) {
00820 float rTmp = 0.0;
00821
00822 for (j = 0; j < 512 / decifactor; j++)
00823 rTmp += samples_in[deciindex - j] * prCoeff[k + j * decifactor];
00824 samples_out[interp_index++] = (rTmp * scale) + bias;
00825 }
00826 }
00827 }
00828
00829
00830 #define MIX_REAR1(samples, si1, rs, coef) \
00831 samples[i] += samples[si1] * coef[rs][0]; \
00832 samples[i+256] += samples[si1] * coef[rs][1];
00833
00834 #define MIX_REAR2(samples, si1, si2, rs, coef) \
00835 samples[i] += samples[si1] * coef[rs][0] + samples[si2] * coef[rs+1][0]; \
00836 samples[i+256] += samples[si1] * coef[rs][1] + samples[si2] * coef[rs+1][1];
00837
00838 #define MIX_FRONT3(samples, coef) \
00839 t = samples[i]; \
00840 samples[i] = t * coef[0][0] + samples[i+256] * coef[1][0] + samples[i+512] * coef[2][0]; \
00841 samples[i+256] = t * coef[0][1] + samples[i+256] * coef[1][1] + samples[i+512] * coef[2][1];
00842
00843 #define DOWNMIX_TO_STEREO(op1, op2) \
00844 for(i = 0; i < 256; i++){ \
00845 op1 \
00846 op2 \
00847 }
00848
00849 static void dca_downmix(float *samples, int srcfmt,
00850 int downmix_coef[DCA_PRIM_CHANNELS_MAX][2])
00851 {
00852 int i;
00853 float t;
00854 float coef[DCA_PRIM_CHANNELS_MAX][2];
00855
00856 for(i=0; i<DCA_PRIM_CHANNELS_MAX; i++) {
00857 coef[i][0] = dca_downmix_coeffs[downmix_coef[i][0]];
00858 coef[i][1] = dca_downmix_coeffs[downmix_coef[i][1]];
00859 }
00860
00861 switch (srcfmt) {
00862 case DCA_MONO:
00863 case DCA_CHANNEL:
00864 case DCA_STEREO_TOTAL:
00865 case DCA_STEREO_SUMDIFF:
00866 case DCA_4F2R:
00867 av_log(NULL, 0, "Not implemented!\n");
00868 break;
00869 case DCA_STEREO:
00870 break;
00871 case DCA_3F:
00872 DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),);
00873 break;
00874 case DCA_2F1R:
00875 DOWNMIX_TO_STEREO(MIX_REAR1(samples, i + 512, 2, coef),);
00876 break;
00877 case DCA_3F1R:
00878 DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),
00879 MIX_REAR1(samples, i + 768, 3, coef));
00880 break;
00881 case DCA_2F2R:
00882 DOWNMIX_TO_STEREO(MIX_REAR2(samples, i + 512, i + 768, 2, coef),);
00883 break;
00884 case DCA_3F2R:
00885 DOWNMIX_TO_STEREO(MIX_FRONT3(samples, coef),
00886 MIX_REAR2(samples, i + 768, i + 1024, 3, coef));
00887 break;
00888 }
00889 }
00890
00891
00892
00893
00894 static int decode_blockcode(int code, int levels, int *values)
00895 {
00896 int i;
00897 int offset = (levels - 1) >> 1;
00898
00899 for (i = 0; i < 4; i++) {
00900 values[i] = (code % levels) - offset;
00901 code /= levels;
00902 }
00903
00904 if (code == 0)
00905 return 0;
00906 else {
00907 av_log(NULL, AV_LOG_ERROR, "ERROR: block code look-up failed\n");
00908 return -1;
00909 }
00910 }
00911
00912 static const uint8_t abits_sizes[7] = { 7, 10, 12, 13, 15, 17, 19 };
00913 static const uint8_t abits_levels[7] = { 3, 5, 7, 9, 13, 17, 25 };
00914
00915 static int dca_subsubframe(DCAContext * s)
00916 {
00917 int k, l;
00918 int subsubframe = s->current_subsubframe;
00919
00920 const float *quant_step_table;
00921
00922
00923 float subband_samples[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][8];
00924
00925
00926
00927
00928
00929
00930 if (s->bit_rate_index == 0x1f)
00931 quant_step_table = lossless_quant_d;
00932 else
00933 quant_step_table = lossy_quant_d;
00934
00935 for (k = 0; k < s->prim_channels; k++) {
00936 for (l = 0; l < s->vq_start_subband[k]; l++) {
00937 int m;
00938
00939
00940 int abits = s->bitalloc[k][l];
00941
00942 float quant_step_size = quant_step_table[abits];
00943 float rscale;
00944
00945
00946
00947
00948
00949
00950 int sel = s->quant_index_huffman[k][abits];
00951
00952
00953
00954
00955 if(!abits){
00956 memset(subband_samples[k][l], 0, 8 * sizeof(subband_samples[0][0][0]));
00957 }else if(abits >= 11 || !dca_smpl_bitalloc[abits].vlc[sel].table){
00958 if(abits <= 7){
00959
00960 int block_code1, block_code2, size, levels;
00961 int block[8];
00962
00963 size = abits_sizes[abits-1];
00964 levels = abits_levels[abits-1];
00965
00966 block_code1 = get_bits(&s->gb, size);
00967
00968 decode_blockcode(block_code1, levels, block);
00969 block_code2 = get_bits(&s->gb, size);
00970 decode_blockcode(block_code2, levels, &block[4]);
00971 for (m = 0; m < 8; m++)
00972 subband_samples[k][l][m] = block[m];
00973 }else{
00974
00975 for (m = 0; m < 8; m++)
00976 subband_samples[k][l][m] = get_sbits(&s->gb, abits - 3);
00977 }
00978 }else{
00979
00980 for (m = 0; m < 8; m++)
00981 subband_samples[k][l][m] = get_bitalloc(&s->gb, &dca_smpl_bitalloc[abits], sel);
00982 }
00983
00984
00985 if (s->transition_mode[k][l] &&
00986 subsubframe >= s->transition_mode[k][l])
00987 rscale = quant_step_size * s->scale_factor[k][l][1];
00988 else
00989 rscale = quant_step_size * s->scale_factor[k][l][0];
00990
00991 rscale *= s->scalefactor_adj[k][sel];
00992
00993 for (m = 0; m < 8; m++)
00994 subband_samples[k][l][m] *= rscale;
00995
00996
00997
00998
00999 if (s->prediction_mode[k][l]) {
01000 int n;
01001 for (m = 0; m < 8; m++) {
01002 for (n = 1; n <= 4; n++)
01003 if (m >= n)
01004 subband_samples[k][l][m] +=
01005 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *
01006 subband_samples[k][l][m - n] / 8192);
01007 else if (s->predictor_history)
01008 subband_samples[k][l][m] +=
01009 (adpcm_vb[s->prediction_vq[k][l]][n - 1] *
01010 s->subband_samples_hist[k][l][m - n +
01011 4] / 8192);
01012 }
01013 }
01014 }
01015
01016
01017
01018
01019 for (l = s->vq_start_subband[k]; l < s->subband_activity[k]; l++) {
01020
01021
01022 int m;
01023
01024 if (!s->debug_flag & 0x01) {
01025 av_log(s->avctx, AV_LOG_DEBUG, "Stream with high frequencies VQ coding\n");
01026 s->debug_flag |= 0x01;
01027 }
01028
01029 for (m = 0; m < 8; m++) {
01030 subband_samples[k][l][m] =
01031 high_freq_vq[s->high_freq_vq[k][l]][subsubframe * 8 +
01032 m]
01033 * (float) s->scale_factor[k][l][0] / 16.0;
01034 }
01035 }
01036 }
01037
01038
01039 if (s->aspf || subsubframe == s->subsubframes - 1) {
01040 if (0xFFFF == get_bits(&s->gb, 16)) {
01041 #ifdef TRACE
01042 av_log(s->avctx, AV_LOG_DEBUG, "Got subframe DSYNC\n");
01043 #endif
01044 } else {
01045 av_log(s->avctx, AV_LOG_ERROR, "Didn't get subframe DSYNC\n");
01046 }
01047 }
01048
01049
01050 for (k = 0; k < s->prim_channels; k++)
01051 for (l = 0; l < s->vq_start_subband[k]; l++)
01052 memcpy(s->subband_samples_hist[k][l], &subband_samples[k][l][4],
01053 4 * sizeof(subband_samples[0][0][0]));
01054
01055
01056 for (k = 0; k < s->prim_channels; k++) {
01057
01058
01059 qmf_32_subbands(s, k, subband_samples[k], &s->samples[256 * s->channel_order_tab[k]],
01060 M_SQRT1_2*s->scale_bias ,
01061 s->add_bias );
01062 }
01063
01064
01065
01066 if (s->prim_channels > dca_channels[s->output & DCA_CHANNEL_MASK]) {
01067 dca_downmix(s->samples, s->amode, s->downmix_coef);
01068 }
01069
01070
01071 if (s->output & DCA_LFE) {
01072 int lfe_samples = 2 * s->lfe * s->subsubframes;
01073
01074 lfe_interpolation_fir(s->lfe, 2 * s->lfe,
01075 s->lfe_data + lfe_samples +
01076 2 * s->lfe * subsubframe,
01077 &s->samples[256 * dca_lfe_index[s->amode]],
01078 (1.0/256.0)*s->scale_bias, s->add_bias);
01079
01080 }
01081
01082 return 0;
01083 }
01084
01085
01086 static int dca_subframe_footer(DCAContext * s)
01087 {
01088 int aux_data_count = 0, i;
01089 int lfe_samples;
01090
01091
01092
01093
01094
01095 if (s->timestamp)
01096 get_bits(&s->gb, 32);
01097
01098 if (s->aux_data)
01099 aux_data_count = get_bits(&s->gb, 6);
01100
01101 for (i = 0; i < aux_data_count; i++)
01102 get_bits(&s->gb, 8);
01103
01104 if (s->crc_present && (s->downmix || s->dynrange))
01105 get_bits(&s->gb, 16);
01106
01107 lfe_samples = 2 * s->lfe * s->subsubframes;
01108 for (i = 0; i < lfe_samples; i++) {
01109 s->lfe_data[i] = s->lfe_data[i + lfe_samples];
01110 }
01111
01112 return 0;
01113 }
01114
01121 static int dca_decode_block(DCAContext * s)
01122 {
01123
01124
01125 if (s->current_subframe >= s->subframes) {
01126 av_log(s->avctx, AV_LOG_DEBUG, "check failed: %i>%i",
01127 s->current_subframe, s->subframes);
01128 return -1;
01129 }
01130
01131 if (!s->current_subsubframe) {
01132 #ifdef TRACE
01133 av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_header\n");
01134 #endif
01135
01136 if (dca_subframe_header(s))
01137 return -1;
01138 }
01139
01140
01141 #ifdef TRACE
01142 av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subsubframe\n");
01143 #endif
01144 if (dca_subsubframe(s))
01145 return -1;
01146
01147
01148 s->current_subsubframe++;
01149 if (s->current_subsubframe >= s->subsubframes) {
01150 s->current_subsubframe = 0;
01151 s->current_subframe++;
01152 }
01153 if (s->current_subframe >= s->subframes) {
01154 #ifdef TRACE
01155 av_log(s->avctx, AV_LOG_DEBUG, "DSYNC dca_subframe_footer\n");
01156 #endif
01157
01158 if (dca_subframe_footer(s))
01159 return -1;
01160 }
01161
01162 return 0;
01163 }
01164
01168 static int dca_convert_bitstream(const uint8_t * src, int src_size, uint8_t * dst,
01169 int max_size)
01170 {
01171 uint32_t mrk;
01172 int i, tmp;
01173 const uint16_t *ssrc = (const uint16_t *) src;
01174 uint16_t *sdst = (uint16_t *) dst;
01175 PutBitContext pb;
01176
01177 if((unsigned)src_size > (unsigned)max_size) {
01178
01179
01180 src_size = max_size;
01181 }
01182
01183 mrk = AV_RB32(src);
01184 switch (mrk) {
01185 case DCA_MARKER_RAW_BE:
01186 memcpy(dst, src, src_size);
01187 return src_size;
01188 case DCA_MARKER_RAW_LE:
01189 for (i = 0; i < (src_size + 1) >> 1; i++)
01190 *sdst++ = bswap_16(*ssrc++);
01191 return src_size;
01192 case DCA_MARKER_14B_BE:
01193 case DCA_MARKER_14B_LE:
01194 init_put_bits(&pb, dst, max_size);
01195 for (i = 0; i < (src_size + 1) >> 1; i++, src += 2) {
01196 tmp = ((mrk == DCA_MARKER_14B_BE) ? AV_RB16(src) : AV_RL16(src)) & 0x3FFF;
01197 put_bits(&pb, 14, tmp);
01198 }
01199 flush_put_bits(&pb);
01200 return (put_bits_count(&pb) + 7) >> 3;
01201 default:
01202 return -1;
01203 }
01204 }
01205
01210 static int dca_decode_frame(AVCodecContext * avctx,
01211 void *data, int *data_size,
01212 const uint8_t * buf, int buf_size)
01213 {
01214
01215 int i;
01216 int16_t *samples = data;
01217 DCAContext *s = avctx->priv_data;
01218 int channels;
01219
01220
01221 s->dca_buffer_size = dca_convert_bitstream(buf, buf_size, s->dca_buffer, DCA_MAX_FRAME_SIZE);
01222 if (s->dca_buffer_size == -1) {
01223 av_log(avctx, AV_LOG_ERROR, "Not a valid DCA frame\n");
01224 return -1;
01225 }
01226
01227 init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);
01228 if (dca_parse_frame_header(s) < 0) {
01229
01230 *data_size=0;
01231 return buf_size;
01232 }
01233
01234 avctx->sample_rate = s->sample_rate;
01235 avctx->bit_rate = s->bit_rate;
01236
01237 channels = s->prim_channels + !!s->lfe;
01238
01239 if (s->amode<16) {
01240 avctx->channel_layout = dca_core_channel_layout[s->amode];
01241
01242 if (s->lfe) {
01243 avctx->channel_layout |= CH_LOW_FREQUENCY;
01244 s->channel_order_tab = dca_channel_reorder_lfe[s->amode];
01245 } else
01246 s->channel_order_tab = dca_channel_reorder_nolfe[s->amode];
01247
01248 if(avctx->request_channels == 2 && s->prim_channels > 2) {
01249 channels = 2;
01250 s->output = DCA_STEREO;
01251 avctx->channel_layout = CH_LAYOUT_STEREO;
01252 }
01253 } else {
01254 av_log(avctx, AV_LOG_ERROR, "Non standard configuration %d !\n",s->amode);
01255 return -1;
01256 }
01257
01258
01259
01260
01261
01262
01263
01264 if (!avctx->channels)
01265 avctx->channels = channels;
01266
01267 if(*data_size < (s->sample_blocks / 8) * 256 * sizeof(int16_t) * channels)
01268 return -1;
01269 *data_size = 256 / 8 * s->sample_blocks * sizeof(int16_t) * channels;
01270 for (i = 0; i < (s->sample_blocks / 8); i++) {
01271 dca_decode_block(s);
01272 s->dsp.float_to_int16_interleave(samples, s->samples_chanptr, 256, channels);
01273 samples += 256 * channels;
01274 }
01275
01276 return buf_size;
01277 }
01278
01279
01280
01287 static av_cold int dca_decode_init(AVCodecContext * avctx)
01288 {
01289 DCAContext *s = avctx->priv_data;
01290 int i;
01291
01292 s->avctx = avctx;
01293 dca_init_vlcs();
01294
01295 dsputil_init(&s->dsp, avctx);
01296 ff_mdct_init(&s->imdct, 6, 1);
01297
01298 for(i = 0; i < 6; i++)
01299 s->samples_chanptr[i] = s->samples + i * 256;
01300 avctx->sample_fmt = SAMPLE_FMT_S16;
01301
01302 if(s->dsp.float_to_int16 == ff_float_to_int16_c) {
01303 s->add_bias = 385.0f;
01304 s->scale_bias = 1.0 / 32768.0;
01305 } else {
01306 s->add_bias = 0.0f;
01307 s->scale_bias = 1.0;
01308
01309
01310 if (avctx->channels > 0 && avctx->request_channels < avctx->channels &&
01311 avctx->request_channels == 2) {
01312 avctx->channels = avctx->request_channels;
01313 }
01314 }
01315
01316
01317 return 0;
01318 }
01319
01320 static av_cold int dca_decode_end(AVCodecContext * avctx)
01321 {
01322 DCAContext *s = avctx->priv_data;
01323 ff_mdct_end(&s->imdct);
01324 return 0;
01325 }
01326
01327 AVCodec dca_decoder = {
01328 .name = "dca",
01329 .type = CODEC_TYPE_AUDIO,
01330 .id = CODEC_ID_DTS,
01331 .priv_data_size = sizeof(DCAContext),
01332 .init = dca_decode_init,
01333 .decode = dca_decode_frame,
01334 .close = dca_decode_end,
01335 .long_name = NULL_IF_CONFIG_SMALL("DCA (DTS Coherent Acoustics)"),
01336 };