making act segmenter

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diff --git a/ffmpeg1/libavcodec/ac3dec.h b/ffmpeg1/libavcodec/ac3dec.h
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--- a/ffmpeg1/libavcodec/ac3dec.h
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-/*
- * Common code between the AC-3 and E-AC-3 decoders
- * Copyright (c) 2007 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * Common code between the AC-3 and E-AC-3 decoders.
- *
- * Summary of MDCT Coefficient Grouping:
- * The individual MDCT coefficient indices are often referred to in the
- * (E-)AC-3 specification as frequency bins.  These bins are grouped together
- * into subbands of 12 coefficients each.  The subbands are grouped together
- * into bands as defined in the bitstream by the band structures, which
- * determine the number of bands and the size of each band.  The full spectrum
- * of 256 frequency bins is divided into 1 DC bin + 21 subbands = 253 bins.
- * This system of grouping coefficients is used for channel bandwidth, stereo
- * rematrixing, channel coupling, enhanced coupling, and spectral extension.
- *
- * +-+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+-+
- * |1|  |12|  |  [12|12|12|12]  |  |  |  |  |  |  |  |  |  |  |  |  |3|
- * +-+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+-+
- * ~~~  ~~~~     ~~~~~~~~~~~~~                                      ~~~
- *  |     |            |                                             |
- *  |     |            |                    3 unused frequency bins--+
- *  |     |            |
- *  |     |            +--1 band containing 4 subbands
- *  |     |
- *  |     +--1 subband of 12 frequency bins
- *  |
- *  +--DC frequency bin
- */
-
-#ifndef AVCODEC_AC3DEC_H
-#define AVCODEC_AC3DEC_H
-
-#include "libavutil/float_dsp.h"
-#include "libavutil/lfg.h"
-#include "ac3.h"
-#include "ac3dsp.h"
-#include "get_bits.h"
-#include "dsputil.h"
-#include "fft.h"
-#include "fmtconvert.h"
-
-#define AC3_OUTPUT_LFEON  8
-
-#define SPX_MAX_BANDS    17
-
-/** Large enough for maximum possible frame size when the specification limit is ignored */
-#define AC3_FRAME_BUFFER_SIZE 32768
-
-typedef struct AC3DecodeContext {
-    AVClass        *class;                  ///< class for AVOptions
-    AVCodecContext *avctx;                  ///< parent context
-    GetBitContext gbc;                      ///< bitstream reader
-
-///@name Bit stream information
-///@{
-    int frame_type;                         ///< frame type                             (strmtyp)
-    int substreamid;                        ///< substream identification
-    int frame_size;                         ///< current frame size, in bytes
-    int bit_rate;                           ///< stream bit rate, in bits-per-second
-    int sample_rate;                        ///< sample frequency, in Hz
-    int num_blocks;                         ///< number of audio blocks
-    int bitstream_mode;                     ///< bitstream mode                         (bsmod)
-    int channel_mode;                       ///< channel mode                           (acmod)
-    int channel_layout;                     ///< channel layout
-    int lfe_on;                             ///< lfe channel in use
-    int channel_map;                        ///< custom channel map
-    int center_mix_level;                   ///< Center mix level index
-    int surround_mix_level;                 ///< Surround mix level index
-    int eac3;                               ///< indicates if current frame is E-AC-3
-///@}
-
-    int preferred_stereo_downmix;
-    float ltrt_center_mix_level;
-    float ltrt_surround_mix_level;
-    float loro_center_mix_level;
-    float loro_surround_mix_level;
-
-///@name Frame syntax parameters
-    int snr_offset_strategy;                ///< SNR offset strategy                    (snroffststr)
-    int block_switch_syntax;                ///< block switch syntax enabled            (blkswe)
-    int dither_flag_syntax;                 ///< dither flag syntax enabled             (dithflage)
-    int bit_allocation_syntax;              ///< bit allocation model syntax enabled    (bamode)
-    int fast_gain_syntax;                   ///< fast gain codes enabled                (frmfgaincode)
-    int dba_syntax;                         ///< delta bit allocation syntax enabled    (dbaflde)
-    int skip_syntax;                        ///< skip field syntax enabled              (skipflde)
- ///@}
-
-///@name Standard coupling
-    int cpl_in_use[AC3_MAX_BLOCKS];         ///< coupling in use                        (cplinu)
-    int cpl_strategy_exists[AC3_MAX_BLOCKS];///< coupling strategy exists               (cplstre)
-    int channel_in_cpl[AC3_MAX_CHANNELS];   ///< channel in coupling                    (chincpl)
-    int phase_flags_in_use;                 ///< phase flags in use                     (phsflginu)
-    int phase_flags[AC3_MAX_CPL_BANDS];     ///< phase flags                            (phsflg)
-    int num_cpl_bands;                      ///< number of coupling bands               (ncplbnd)
-    uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band
-    int firstchincpl;                       ///< first channel in coupling
-    int first_cpl_coords[AC3_MAX_CHANNELS]; ///< first coupling coordinates states      (firstcplcos)
-    int cpl_coords[AC3_MAX_CHANNELS][AC3_MAX_CPL_BANDS]; ///< coupling coordinates      (cplco)
-///@}
-
-///@name Spectral extension
-///@{
-    int spx_in_use;                             ///< spectral extension in use              (spxinu)
-    uint8_t channel_uses_spx[AC3_MAX_CHANNELS]; ///< channel uses spectral extension        (chinspx)
-    int8_t spx_atten_code[AC3_MAX_CHANNELS];    ///< spx attenuation code                   (spxattencod)
-    int spx_src_start_freq;                     ///< spx start frequency bin
-    int spx_dst_end_freq;                       ///< spx end frequency bin
-    int spx_dst_start_freq;                     ///< spx starting frequency bin for copying (copystartmant)
-                                                ///< the copy region ends at the start of the spx region.
-    int num_spx_bands;                          ///< number of spx bands                    (nspxbnds)
-    uint8_t spx_band_sizes[SPX_MAX_BANDS];      ///< number of bins in each spx band
-    uint8_t first_spx_coords[AC3_MAX_CHANNELS]; ///< first spx coordinates states           (firstspxcos)
-    float spx_noise_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS]; ///< spx noise blending factor  (nblendfact)
-    float spx_signal_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS];///< spx signal blending factor (sblendfact)
-///@}
-
-///@name Adaptive hybrid transform
-    int channel_uses_aht[AC3_MAX_CHANNELS];                         ///< channel AHT in use (chahtinu)
-    int pre_mantissa[AC3_MAX_CHANNELS][AC3_MAX_COEFS][AC3_MAX_BLOCKS];  ///< pre-IDCT mantissas
-///@}
-
-///@name Channel
-    int fbw_channels;                           ///< number of full-bandwidth channels
-    int channels;                               ///< number of total channels
-    int lfe_ch;                                 ///< index of LFE channel
-    float downmix_coeffs[AC3_MAX_CHANNELS][2];  ///< stereo downmix coefficients
-    int downmixed;                              ///< indicates if coeffs are currently downmixed
-    int output_mode;                            ///< output channel configuration
-    int out_channels;                           ///< number of output channels
-///@}
-
-///@name Dynamic range
-    float dynamic_range[2];                 ///< dynamic range
-    float drc_scale;                        ///< percentage of dynamic range compression to be applied
-///@}
-
-///@name Bandwidth
-    int start_freq[AC3_MAX_CHANNELS];       ///< start frequency bin                    (strtmant)
-    int end_freq[AC3_MAX_CHANNELS];         ///< end frequency bin                      (endmant)
-///@}
-
-///@name Rematrixing
-    int num_rematrixing_bands;              ///< number of rematrixing bands            (nrematbnd)
-    int rematrixing_flags[4];               ///< rematrixing flags                      (rematflg)
-///@}
-
-///@name Exponents
-    int num_exp_groups[AC3_MAX_CHANNELS];           ///< Number of exponent groups      (nexpgrp)
-    int8_t dexps[AC3_MAX_CHANNELS][AC3_MAX_COEFS];  ///< decoded exponents
-    int exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS]; ///< exponent strategies        (expstr)
-///@}
-
-///@name Bit allocation
-    AC3BitAllocParameters bit_alloc_params;         ///< bit allocation parameters
-    int first_cpl_leak;                             ///< first coupling leak state      (firstcplleak)
-    int snr_offset[AC3_MAX_CHANNELS];               ///< signal-to-noise ratio offsets  (snroffst)
-    int fast_gain[AC3_MAX_CHANNELS];                ///< fast gain values/SMR's         (fgain)
-    uint8_t bap[AC3_MAX_CHANNELS][AC3_MAX_COEFS];   ///< bit allocation pointers
-    int16_t psd[AC3_MAX_CHANNELS][AC3_MAX_COEFS];   ///< scaled exponents
-    int16_t band_psd[AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS]; ///< interpolated exponents
-    int16_t mask[AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS];     ///< masking curve values
-    int dba_mode[AC3_MAX_CHANNELS];                 ///< delta bit allocation mode
-    int dba_nsegs[AC3_MAX_CHANNELS];                ///< number of delta segments
-    uint8_t dba_offsets[AC3_MAX_CHANNELS][8];       ///< delta segment offsets
-    uint8_t dba_lengths[AC3_MAX_CHANNELS][8];       ///< delta segment lengths
-    uint8_t dba_values[AC3_MAX_CHANNELS][8];        ///< delta values for each segment
-///@}
-
-///@name Zero-mantissa dithering
-    int dither_flag[AC3_MAX_CHANNELS];      ///< dither flags                           (dithflg)
-    AVLFG dith_state;                       ///< for dither generation
-///@}
-
-///@name IMDCT
-    int block_switch[AC3_MAX_CHANNELS];     ///< block switch flags                     (blksw)
-    FFTContext imdct_512;                   ///< for 512 sample IMDCT
-    FFTContext imdct_256;                   ///< for 256 sample IMDCT
-///@}
-
-///@name Optimization
-    DSPContext dsp;                         ///< for optimization
-    AVFloatDSPContext fdsp;
-    AC3DSPContext ac3dsp;
-    FmtConvertContext fmt_conv;             ///< optimized conversion functions
-///@}
-
-    float *outptr[AC3_MAX_CHANNELS];
-    float *xcfptr[AC3_MAX_CHANNELS];
-    float *dlyptr[AC3_MAX_CHANNELS];
-
-///@name Aligned arrays
-    DECLARE_ALIGNED(16, int,   fixed_coeffs)[AC3_MAX_CHANNELS][AC3_MAX_COEFS];       ///< fixed-point transform coefficients
-    DECLARE_ALIGNED(32, float, transform_coeffs)[AC3_MAX_CHANNELS][AC3_MAX_COEFS];   ///< transform coefficients
-    DECLARE_ALIGNED(32, float, delay)[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE];             ///< delay - added to the next block
-    DECLARE_ALIGNED(32, float, window)[AC3_BLOCK_SIZE];                              ///< window coefficients
-    DECLARE_ALIGNED(32, float, tmp_output)[AC3_BLOCK_SIZE];                          ///< temporary storage for output before windowing
-    DECLARE_ALIGNED(32, float, output)[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE];            ///< output after imdct transform and windowing
-    DECLARE_ALIGNED(32, uint8_t, input_buffer)[AC3_FRAME_BUFFER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; ///< temp buffer to prevent overread
-///@}
-} AC3DecodeContext;
-
-/**
- * Parse the E-AC-3 frame header.
- * This parses both the bit stream info and audio frame header.
- */
-int ff_eac3_parse_header(AC3DecodeContext *s);
-
-/**
- * Decode mantissas in a single channel for the entire frame.
- * This is used when AHT mode is enabled.
- */
-void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch);
-
-/**
- * Apply spectral extension to each channel by copying lower frequency
- * coefficients to higher frequency bins and applying side information to
- * approximate the original high frequency signal.
- */
-void ff_eac3_apply_spectral_extension(AC3DecodeContext *s);
-
-#endif /* AVCODEC_AC3DEC_H */