/*
  * Copyright (C) 2016 foo86
  *
  * 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
  */
 
 #ifndef AVCODEC_DCA_LBR_H
 #define AVCODEC_DCA_LBR_H
 
 #include "libavutil/common.h"
 #include "libavutil/float_dsp.h"
 #include "libavutil/mem.h"
 
 #include "avcodec.h"
 #include "internal.h"
 #include "get_bits.h"
 #include "dca.h"
 #include "dca_exss.h"
 #include "dcadsp.h"
 #include "fft.h"
 
 #define DCA_LBR_CHANNELS        6
 #define DCA_LBR_CHANNELS_TOTAL  32
 #define DCA_LBR_SUBBANDS        32
 #define DCA_LBR_TONES           512
 
 #define DCA_LBR_TIME_SAMPLES    128
 #define DCA_LBR_TIME_HISTORY    8
 

 enum DCALBRHeader {
     DCA_LBR_HEADER_SYNC_ONLY    = 1,
     DCA_LBR_HEADER_DECODER_INIT = 2
 };
 

 typedef struct DCALbrTone {
     uint8_t     x_freq;     ///< Spectral line offset
     uint8_t     f_delt;     ///< Difference between original and center frequency
     uint8_t     ph_rot;     ///< Phase rotation
     uint8_t     pad;        ///< Padding field
     uint8_t     amp[DCA_LBR_CHANNELS];  ///< Per-channel amplitude
     uint8_t     phs[DCA_LBR_CHANNELS];  ///< Per-channel phase
 } DCALbrTone;
 
 typedef struct DCALbrDecoder {
     AVCodecContext  *avctx;
     GetBitContext   gb;
 
     int     sample_rate;        ///< Sample rate of LBR audio
     int     ch_mask;            ///< LBR speaker mask
     int     flags;              ///< Flags for LBR decoder initialization
     int     bit_rate_orig;      ///< Original bit rate
     int     bit_rate_scaled;    ///< Scaled bit rate
 
     int     nchannels;          ///< Number of fullband channels to decode
     int     nchannels_total;    ///< Total number of fullband channels
     int     freq_range;         ///< Frequency range of LBR audio
     int     band_limit;         ///< Band limit factor
     int     limited_rate;       ///< Band limited sample rate
     int     limited_range;      ///< Band limited frequency range
     int     res_profile;        ///< Resolution profile
     int     nsubbands;          ///< Number of encoded subbands
     int     g3_avg_only_start_sb;   ///< Subband index where grid 3 scale factors end
     int     min_mono_subband;   ///< Subband index where mono encoding starts
     int     max_mono_subband;   ///< Subband index where mono encoding ends
 
     int     framenum;   ///< Lower 5 bits of current frame number
     int     lbr_rand;   ///< Seed for subband randomization
     int     warned;     ///< Flags for warning suppression
 
     uint8_t     quant_levels[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS];   ///< Quantization levels
     uint8_t     sb_indices[DCA_LBR_SUBBANDS];   ///< Subband reordering indices
 
     uint8_t     sec_ch_sbms[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS];    ///< Right channel inversion or mid/side decoding flags
     uint8_t     sec_ch_lrms[DCA_LBR_CHANNELS / 2][DCA_LBR_SUBBANDS];    ///< Flags indicating if left/right channel are swapped
     uint32_t    ch_pres[DCA_LBR_CHANNELS];  ///< Subband allocation flags
 
     uint8_t     grid_1_scf[DCA_LBR_CHANNELS][12][8];    ///< Grid 1 scale factors
     uint8_t     grid_2_scf[DCA_LBR_CHANNELS][3][64];    ///< Grid 2 scale factors
 
     int8_t      grid_3_avg[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS - 4];     ///< Grid 3 average values
     int8_t      grid_3_scf[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS - 4][8];  ///< Grid 3 scale factors
     uint32_t    grid_3_pres[DCA_LBR_CHANNELS];  ///< Grid 3 scale factors presence flags
 
     uint8_t     high_res_scf[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS][8];    ///< High-frequency resolution scale factors
 
     uint8_t     part_stereo[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS / 4][5]; ///< Partial stereo coefficients
     uint8_t     part_stereo_pres;   ///< Partial stereo coefficients presence flags
 
     float       lpc_coeff[2][DCA_LBR_CHANNELS][3][2][8];    ///< Predictor coefficients
 
     float       sb_scf[DCA_LBR_SUBBANDS];   ///< Subband randomization scale factors
 
     float       *time_samples[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS]; ///< Time samples
 
     float           *ts_buffer; ///< Time sample buffer base
     unsigned int    ts_size;    ///< Time sample buffer size
 
     DECLARE_ALIGNED(32, float, history)[DCA_LBR_CHANNELS][DCA_LBR_SUBBANDS * 4];    ///< IMDCT history
     DECLARE_ALIGNED(32, float, window)[DCA_LBR_SUBBANDS * 4];   ///< Long window for IMDCT
 
     DECLARE_ALIGNED(32, float, lfe_data)[64];       ///< Decimated LFE samples
     DECLARE_ALIGNED(32, float, lfe_history)[5][2];  ///< LFE IIR filter history
     float lfe_scale;    ///< Scale factor of LFE samples before IIR filter
 
     uint8_t     tonal_scf[6];           ///< Tonal scale factors
     uint16_t    tonal_bounds[5][32][2]; ///< Per-group per-subframe start/end positions of tones
     DCALbrTone  tones[DCA_LBR_TONES];   ///< Circular buffer of tones
     int         ntones;                 ///< Circular buffer head position
 
     FFTContext          imdct;
     AVFloatDSPContext   *fdsp;
     DCADSPContext       *dcadsp;
 } DCALbrDecoder;
 
 int ff_dca_lbr_parse(DCALbrDecoder *s, uint8_t *data, DCAExssAsset *asset);
 int ff_dca_lbr_filter_frame(DCALbrDecoder *s, AVFrame *frame);
 av_cold void ff_dca_lbr_flush(DCALbrDecoder *s);
 av_cold int ff_dca_lbr_init(DCALbrDecoder *s);
 av_cold void ff_dca_lbr_close(DCALbrDecoder *s);
 
 #endif