/* * dca_internal.h * Copyright (C) 2004 Gildas Bazin * Copyright (C) 2000-2003 Michel Lespinasse * Copyright (C) 1999-2000 Aaron Holtzman * * This file is part of libdca, a free DTS Coherent Acoustics stream decoder. * See http://www.videolan.org/developers/libdca.html for updates. * * libdca is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * libdca is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the * Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #define DCA_SUBFRAMES_MAX (16) #define DCA_PRIM_CHANNELS_MAX (5) #define DCA_SUBBANDS (32) #define DCA_ABITS_MAX (32) /* Should be 28 */ #define DCA_SUBSUBFAMES_MAX (4) #define DCA_LFE_MAX (3) struct dca_state_s { /* Frame header */ int frame_type; /* type of the current frame */ int samples_deficit; /* deficit sample count */ int crc_present; /* crc is present in the bitstream */ int sample_blocks; /* number of PCM sample blocks */ int frame_size; /* primary frame byte size */ int amode; /* audio channels arrangement */ int sample_rate; /* audio sampling rate */ int bit_rate; /* transmission bit rate */ int downmix; /* embedded downmix enabled */ int dynrange; /* embedded dynamic range flag */ int timestamp; /* embedded time stamp flag */ int aux_data; /* auxiliary data flag */ int hdcd; /* source material is mastered in HDCD */ int ext_descr; /* extension audio descriptor flag */ int ext_coding; /* extended coding flag */ int aspf; /* audio sync word insertion flag */ int lfe; /* low frequency effects flag */ int predictor_history; /* predictor history flag */ int header_crc; /* header crc check bytes */ int multirate_inter; /* multirate interpolator switch */ int version; /* encoder software revision */ int copy_history; /* copy history */ int source_pcm_res; /* source pcm resolution */ int front_sum; /* front sum/difference flag */ int surround_sum; /* surround sum/difference flag */ int dialog_norm; /* dialog normalisation parameter */ /* Primary audio coding header */ int subframes; /* number of subframes */ int prim_channels; /* number of primary audio channels */ /* subband activity count */ int subband_activity[DCA_PRIM_CHANNELS_MAX]; /* high frequency vq start subband */ int vq_start_subband[DCA_PRIM_CHANNELS_MAX]; /* joint intensity coding index */ int joint_intensity[DCA_PRIM_CHANNELS_MAX]; /* transient mode code book */ int transient_huffman[DCA_PRIM_CHANNELS_MAX]; /* scale factor code book */ int scalefactor_huffman[DCA_PRIM_CHANNELS_MAX]; /* bit allocation quantizer select */ int bitalloc_huffman[DCA_PRIM_CHANNELS_MAX]; /* quantization index codebook select */ int quant_index_huffman[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; /* scale factor adjustment */ float scalefactor_adj[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; /* Primary audio coding side information */ int subsubframes; /* number of subsubframes */ int partial_samples; /* partial subsubframe samples count */ /* prediction mode (ADPCM used or not) */ int prediction_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; /* prediction VQ coefs */ int prediction_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; /* bit allocation index */ int bitalloc[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; /* transition mode (transients) */ int transition_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; /* scale factors (2 if transient)*/ int scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][2]; /* joint subband scale factors codebook */ int joint_huff[DCA_PRIM_CHANNELS_MAX]; /* joint subband scale factors */ int joint_scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; /* stereo downmix coefficients */ int downmix_coef[DCA_PRIM_CHANNELS_MAX][2]; /* dynamic range coefficient */ int dynrange_coef; /* VQ encoded high frequency subbands */ int high_freq_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; /* Low frequency effect data */ double lfe_data[2*DCA_SUBSUBFAMES_MAX*DCA_LFE_MAX * 2 /*history*/]; int lfe_scale_factor; /* Subband samples history (for ADPCM) */ double subband_samples_hist[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][4]; double subband_fir_hist[DCA_PRIM_CHANNELS_MAX][512]; double subband_fir_noidea[DCA_PRIM_CHANNELS_MAX][64]; /* Audio output */ level_t clev; /* centre channel mix level */ level_t slev; /* surround channels mix level */ int output; /* type of output */ level_t level; /* output level */ sample_t bias; /* output bias */ sample_t * samples; /* pointer to the internal audio samples buffer */ int downmixed; int dynrnge; /* apply dynamic range */ level_t dynrng; /* dynamic range */ void * dynrngdata; /* dynamic range callback funtion and data */ level_t (* dynrngcall) (level_t range, void * dynrngdata); /* Bitstream handling */ uint32_t * buffer_start; uint32_t bits_left; uint32_t current_word; int word_mode; /* 16/14 bits word format (1 -> 16, 0 -> 14) */ int bigendian_mode; /* endianness (1 -> be, 0 -> le) */ /* Current position in DTS frame */ int current_subframe; int current_subsubframe; /* Pre-calculated cosine modulation coefs for the QMF */ double cos_mod[544]; /* Debug flag */ int debug_flag; }; #define LEVEL_PLUS6DB 2.0 #define LEVEL_PLUS3DB 1.4142135623730951 #define LEVEL_3DB 0.7071067811865476 #define LEVEL_45DB 0.5946035575013605 #define LEVEL_6DB 0.5 int dca_downmix_init (int input, int flags, level_t * level, level_t clev, level_t slev); int dca_downmix_coeff (level_t * coeff, int acmod, int output, level_t level, level_t clev, level_t slev); void dca_downmix (sample_t * samples, int acmod, int output, sample_t bias, level_t clev, level_t slev); void dca_upmix (sample_t * samples, int acmod, int output); #define ROUND(x) ((int)((x) + ((x) > 0 ? 0.5 : -0.5))) #ifndef LIBDCA_FIXED typedef sample_t quantizer_t; #define SAMPLE(x) (x) #define LEVEL(x) (x) #define MUL(a,b) ((a) * (b)) #define MUL_L(a,b) ((a) * (b)) #define MUL_C(a,b) ((a) * (b)) #define DIV(a,b) ((a) / (b)) #define BIAS(x) ((x) + bias) #else /* LIBDCA_FIXED */ typedef int16_t quantizer_t; #define SAMPLE(x) (sample_t)((x) * (1 << 30)) #define LEVEL(x) (level_t)((x) * (1 << 26)) #if 0 #define MUL(a,b) ((int)(((int64_t)(a) * (b) + (1 << 29)) >> 30)) #define MUL_L(a,b) ((int)(((int64_t)(a) * (b) + (1 << 25)) >> 26)) #elif 1 #define MUL(a,b) \ ({ int32_t _ta=(a), _tb=(b), _tc; \ _tc=(_ta & 0xffff)*(_tb >> 16)+(_ta >> 16)*(_tb & 0xffff); (int32_t)(((_tc >> 14))+ (((_ta >> 16)*(_tb >> 16)) << 2 )); }) #define MUL_L(a,b) \ ({ int32_t _ta=(a), _tb=(b), _tc; \ _tc=(_ta & 0xffff)*(_tb >> 16)+(_ta >> 16)*(_tb & 0xffff); (int32_t)((_tc >> 10) + (((_ta >> 16)*(_tb >> 16)) << 6)); }) #else #define MUL(a,b) (((a) >> 15) * ((b) >> 15)) #define MUL_L(a,b) (((a) >> 13) * ((b) >> 13)) #endif #define MUL_C(a,b) MUL_L (a, LEVEL (b)) #define DIV(a,b) ((((int64_t)LEVEL (a)) << 26) / (b)) #define BIAS(x) (x) #endif