dts_internal.h
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上传日期：2015-12-05
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- /*
- * dts_internal.h
- * Copyright (C) 2004 Gildas Bazin <gbazin@videolan.org>
- * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
- * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
- *
- * This file is part of dtsdec, a free DTS Coherent Acoustics stream decoder.
- * See http://www.videolan.org/dtsdec.html for updates.
- *
- * dtsdec 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.
- *
- * dtsdec 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #define DTS_SUBFRAMES_MAX (16)
- #define DTS_PRIM_CHANNELS_MAX (5)
- #define DTS_SUBBANDS (32)
- #define DTS_ABITS_MAX (32) /* Should be 28 */
- #define DTS_SUBSUBFAMES_MAX (4)
- #define DTS_LFE_MAX (3)
- struct dts_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[DTS_PRIM_CHANNELS_MAX];
- /* high frequency vq start subband */
- int vq_start_subband[DTS_PRIM_CHANNELS_MAX];
- /* joint intensity coding index */
- int joint_intensity[DTS_PRIM_CHANNELS_MAX];
- /* transient mode code book */
- int transient_huffman[DTS_PRIM_CHANNELS_MAX];
- /* scale factor code book */
- int scalefactor_huffman[DTS_PRIM_CHANNELS_MAX];
- /* bit allocation quantizer select */
- int bitalloc_huffman[DTS_PRIM_CHANNELS_MAX];
- /* quantization index codebook select */
- int quant_index_huffman[DTS_PRIM_CHANNELS_MAX][DTS_ABITS_MAX];
- /* scale factor adjustment */
- float scalefactor_adj[DTS_PRIM_CHANNELS_MAX][DTS_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[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
- /* prediction VQ coefs */
- int prediction_vq[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
- /* bit allocation index */
- int bitalloc[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
- /* transition mode (transients) */
- int transition_mode[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
- /* scale factors (2 if transient)*/
- int scale_factor[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS][2];
- /* joint subband scale factors codebook */
- int joint_huff[DTS_PRIM_CHANNELS_MAX];
- /* joint subband scale factors */
- int joint_scale_factor[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
- /* stereo downmix coefficients */
- int downmix_coef[DTS_PRIM_CHANNELS_MAX][2];
- /* dynamic range coefficient */
- int dynrange_coef;
- /* VQ encoded high frequency subbands */
- int high_freq_vq[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS];
- /* Low frequency effect data */
- double lfe_data[2*DTS_SUBSUBFAMES_MAX*DTS_LFE_MAX * 2 /*history*/];
- int lfe_scale_factor;
- /* Subband samples history (for ADPCM) */
- double subband_samples_hist[DTS_PRIM_CHANNELS_MAX][DTS_SUBBANDS][4];
- double subband_fir_hist[DTS_PRIM_CHANNELS_MAX][512];
- double subband_fir_noidea[DTS_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 dts_downmix_init (int input, int flags, level_t * level,
- level_t clev, level_t slev);
- int dts_downmix_coeff (level_t * coeff, int acmod, int output, level_t level,
- level_t clev, level_t slev);
- void dts_downmix (sample_t * samples, int acmod, int output, sample_t bias,
- level_t clev, level_t slev);
- void dts_upmix (sample_t * samples, int acmod, int output);
- #define ROUND(x) ((int)((x) + ((x) > 0 ? 0.5 : -0.5)))
- #ifndef LIBDTS_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 /* LIBDTS_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
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