simd int->float
[ffmpeg.git] / libavcodec / ac3dec.h
1 /*
2  * Common code between the AC-3 and E-AC-3 decoders
3  * Copyright (c) 2007 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21
22 /**
23  * @file ac3.h
24  * Common code between the AC-3 and E-AC-3 decoders.
25  */
26
27 #ifndef FFMPEG_AC3DEC_H
28 #define FFMPEG_AC3DEC_H
29
30 #include "libavutil/random.h"
31 #include "ac3tab.h"
32 #include "ac3.h"
33 #include "bitstream.h"
34 #include "dsputil.h"
35
36 /* override ac3.h to include coupling channel */
37 #undef AC3_MAX_CHANNELS
38 #define AC3_MAX_CHANNELS 7
39 #define CPL_CH 0
40
41 #define AC3_OUTPUT_LFEON  8
42
43 #define AC3_MAX_COEFS   256
44 #define AC3_BLOCK_SIZE  256
45 #define MAX_BLOCKS        6
46
47 typedef struct {
48     AVCodecContext *avctx;                  ///< parent context
49     GetBitContext gbc;                      ///< bitstream reader
50     uint8_t *input_buffer;                  ///< temp buffer to prevent overread
51
52 ///@defgroup bsi bit stream information
53 ///@{
54     int frame_type;                         ///< frame type                             (strmtyp)
55     int substreamid;                        ///< substream identification
56     int frame_size;                         ///< current frame size, in bytes
57     int bit_rate;                           ///< stream bit rate, in bits-per-second
58     int sample_rate;                        ///< sample frequency, in Hz
59     int num_blocks;                         ///< number of audio blocks
60     int channel_mode;                       ///< channel mode                           (acmod)
61     int lfe_on;                             ///< lfe channel in use
62     int channel_map;                        ///< custom channel map
63     int center_mix_level;                   ///< Center mix level index
64     int surround_mix_level;                 ///< Surround mix level index
65     int eac3;                               ///< indicates if current frame is E-AC-3
66 ///@}
67
68 ///@defgroup audfrm frame syntax parameters
69     int snr_offset_strategy;                ///< SNR offset strategy                    (snroffststr)
70     int block_switch_syntax;                ///< block switch syntax enabled            (blkswe)
71     int dither_flag_syntax;                 ///< dither flag syntax enabled             (dithflage)
72     int bit_allocation_syntax;              ///< bit allocation model syntax enabled    (bamode)
73     int fast_gain_syntax;                   ///< fast gain codes enabled                (frmfgaincode)
74     int dba_syntax;                         ///< delta bit allocation syntax enabled    (dbaflde)
75     int skip_syntax;                        ///< skip field syntax enabled              (skipflde)
76  ///@}
77
78 ///@defgroup cpl standard coupling
79     int cpl_in_use[MAX_BLOCKS];             ///< coupling in use                        (cplinu)
80     int cpl_strategy_exists[MAX_BLOCKS];    ///< coupling strategy exists               (cplstre)
81     int channel_in_cpl[AC3_MAX_CHANNELS];   ///< channel in coupling                    (chincpl)
82     int phase_flags_in_use;                 ///< phase flags in use                     (phsflginu)
83     int phase_flags[18];                    ///< phase flags                            (phsflg)
84     int num_cpl_subbands;                   ///< number of coupling sub bands           (ncplsubnd)
85     int num_cpl_bands;                      ///< number of coupling bands               (ncplbnd)
86     int cpl_band_struct[18];                ///< coupling band structure                (cplbndstrc)
87     int firstchincpl;                       ///< first channel in coupling
88     int first_cpl_coords[AC3_MAX_CHANNELS]; ///< first coupling coordinates states      (firstcplcos)
89     int cpl_coords[AC3_MAX_CHANNELS][18];   ///< coupling coordinates                   (cplco)
90 ///@}
91
92 ///@defgroup aht adaptive hybrid transform
93     int channel_uses_aht[AC3_MAX_CHANNELS];                         ///< channel AHT in use (chahtinu)
94     int pre_mantissa[AC3_MAX_CHANNELS][AC3_MAX_COEFS][MAX_BLOCKS];  ///< pre-IDCT mantissas
95 ///@}
96
97 ///@defgroup channel channel
98     int fbw_channels;                           ///< number of full-bandwidth channels
99     int channels;                               ///< number of total channels
100     int lfe_ch;                                 ///< index of LFE channel
101     float downmix_coeffs[AC3_MAX_CHANNELS][2];  ///< stereo downmix coefficients
102     int downmixed;                              ///< indicates if coeffs are currently downmixed
103     int output_mode;                            ///< output channel configuration
104     int out_channels;                           ///< number of output channels
105 ///@}
106
107 ///@defgroup dynrng dynamic range
108     float dynamic_range[2];                 ///< dynamic range
109 ///@}
110
111 ///@defgroup bandwidth bandwidth
112     int start_freq[AC3_MAX_CHANNELS];       ///< start frequency bin                    (strtmant)
113     int end_freq[AC3_MAX_CHANNELS];         ///< end frequency bin                      (endmant)
114 ///@}
115
116 ///@defgroup rematrixing rematrixing
117     int num_rematrixing_bands;              ///< number of rematrixing bands            (nrematbnd)
118     int rematrixing_flags[4];               ///< rematrixing flags                      (rematflg)
119 ///@}
120
121 ///@defgroup exponents exponents
122     int num_exp_groups[AC3_MAX_CHANNELS];           ///< Number of exponent groups      (nexpgrp)
123     int8_t dexps[AC3_MAX_CHANNELS][AC3_MAX_COEFS];  ///< decoded exponents
124     int exp_strategy[MAX_BLOCKS][AC3_MAX_CHANNELS]; ///< exponent strategies            (expstr)
125 ///@}
126
127 ///@defgroup bitalloc bit allocation
128     AC3BitAllocParameters bit_alloc_params;         ///< bit allocation parameters
129     int first_cpl_leak;                             ///< first coupling leak state      (firstcplleak)
130     int snr_offset[AC3_MAX_CHANNELS];               ///< signal-to-noise ratio offsets  (snroffst)
131     int fast_gain[AC3_MAX_CHANNELS];                ///< fast gain values/SMR's         (fgain)
132     uint8_t bap[AC3_MAX_CHANNELS][AC3_MAX_COEFS];   ///< bit allocation pointers
133     int16_t psd[AC3_MAX_CHANNELS][AC3_MAX_COEFS];   ///< scaled exponents
134     int16_t band_psd[AC3_MAX_CHANNELS][50];         ///< interpolated exponents
135     int16_t mask[AC3_MAX_CHANNELS][50];             ///< masking curve values
136     int dba_mode[AC3_MAX_CHANNELS];                 ///< delta bit allocation mode
137     int dba_nsegs[AC3_MAX_CHANNELS];                ///< number of delta segments
138     uint8_t dba_offsets[AC3_MAX_CHANNELS][8];       ///< delta segment offsets
139     uint8_t dba_lengths[AC3_MAX_CHANNELS][8];       ///< delta segment lengths
140     uint8_t dba_values[AC3_MAX_CHANNELS][8];        ///< delta values for each segment
141 ///@}
142
143 ///@defgroup dithering zero-mantissa dithering
144     int dither_all;                         ///< true if all channels are dithered
145     int dither_flag[AC3_MAX_CHANNELS];      ///< dither flags                           (dithflg)
146     AVRandomState dith_state;               ///< for dither generation
147 ///@}
148
149 ///@defgroup imdct IMDCT
150     int block_switch[AC3_MAX_CHANNELS];     ///< block switch flags                     (blksw)
151     MDCTContext imdct_512;                  ///< for 512 sample IMDCT
152     MDCTContext imdct_256;                  ///< for 256 sample IMDCT
153 ///@}
154
155 ///@defgroup opt optimization
156     DSPContext dsp;                         ///< for optimization
157     float add_bias;                         ///< offset for float_to_int16 conversion
158     float mul_bias;                         ///< scaling for float_to_int16 conversion
159 ///@}
160
161     DECLARE_ALIGNED_16(int, fixed_coeffs[AC3_MAX_CHANNELS][AC3_MAX_COEFS]);  ///> fixed-point transform coefficients
162
163 ///@defgroup arrays aligned arrays
164     DECLARE_ALIGNED_16(float, transform_coeffs[AC3_MAX_CHANNELS][AC3_MAX_COEFS]);   ///< transform coefficients
165     DECLARE_ALIGNED_16(float, delay[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE]);             ///< delay - added to the next block
166     DECLARE_ALIGNED_16(float, window[AC3_BLOCK_SIZE]);                              ///< window coefficients
167     DECLARE_ALIGNED_16(float, tmp_output[AC3_BLOCK_SIZE]);                          ///< temporary storage for output before windowing
168     DECLARE_ALIGNED_16(float, output[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE]);            ///< output after imdct transform and windowing
169 ///@}
170 } AC3DecodeContext;
171
172 #endif /* FFMPEG_AC3DEC_H */