/*

 * 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_CORE_H

#define AVCODEC_DCA_CORE_H

#include "libavutil/common.h"

#include "libavutil/float_dsp.h"

#include "libavutil/fixed_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 "dcadct.h"

#include "dcamath.h"

#include "dcahuff.h"

#include "fft.h"

#include "synth_filter.h"

#define DCA_CHANNELS            7

#define DCA_SUBBANDS            32

#define DCA_SUBBANDS_X96        64

#define DCA_SUBFRAMES           16

#define DCA_SUBBAND_SAMPLES     8

#define DCA_PCMBLOCK_SAMPLES    32

#define DCA_LFE_HISTORY         8

#define DCA_ABITS_MAX           26

#define DCA_CORE_CHANNELS_MAX       6

#define DCA_DMIX_CHANNELS_MAX       4

#define DCA_XXCH_CHANNELS_MAX       2

#define DCA_EXSS_CHANNELS_MAX       8

#define DCA_EXSS_CHSETS_MAX         4

#define DCA_FILTER_MODE_X96     0x01

#define DCA_FILTER_MODE_FIXED   0x02

enum DCACoreAudioMode {

    DCA_AMODE_MONO,             // Mode 0: A (mono)

    DCA_AMODE_MONO_DUAL,        // Mode 1: A + B (dual mono)

    DCA_AMODE_STEREO,           // Mode 2: L + R (stereo)

    DCA_AMODE_STEREO_SUMDIFF,   // Mode 3: (L+R) + (L-R) (sum-diff)

    DCA_AMODE_STEREO_TOTAL,     // Mode 4: LT + RT (left and right total)

    DCA_AMODE_3F,               // Mode 5: C + L + R

    DCA_AMODE_2F1R,             // Mode 6: L + R + S

    DCA_AMODE_3F1R,             // Mode 7: C + L + R + S

    DCA_AMODE_2F2R,             // Mode 8: L + R + SL + SR

    DCA_AMODE_3F2R,             // Mode 9: C + L + R + SL + SR

    DCA_AMODE_COUNT

};

enum DCACoreExtAudioType {

    DCA_EXT_AUDIO_XCH   = 0,

    DCA_EXT_AUDIO_X96   = 2,

    DCA_EXT_AUDIO_XXCH  = 6

};

enum DCACoreLFEFlag {

    DCA_LFE_FLAG_NONE,

    DCA_LFE_FLAG_128,

    DCA_LFE_FLAG_64,

    DCA_LFE_FLAG_INVALID

};

typedef struct DCADSPData {

    union {

        struct {

            DECLARE_ALIGNED(32, float, hist1)[1024];

            DECLARE_ALIGNED(32, float, hist2)[64];

        } flt;

        struct {

            DECLARE_ALIGNED(32, int32_t, hist1)[1024];

            DECLARE_ALIGNED(32, int32_t, hist2)[64];

        } fix;

    } u;

    int offset;

} DCADSPData;

typedef struct DCACoreDecoder {

    AVCodecContext  *avctx;

    GetBitContext   gb;

    GetBitContext   gb_in;

    // Bit stream header

    int     crc_present;        ///< CRC present flag

    int     npcmblocks;         ///< Number of PCM sample blocks

    int     frame_size;         ///< Primary frame byte size

    int     audio_mode;         ///< Audio channel arrangement

    int     sample_rate;        ///< Core audio sampling frequency

    int     bit_rate;           ///< Transmission bit rate

    int     drc_present;        ///< Embedded dynamic range flag

    int     ts_present;         ///< Embedded time stamp flag

    int     aux_present;        ///< Auxiliary data flag

    int     ext_audio_type;     ///< Extension audio descriptor flag

    int     ext_audio_present;  ///< Extended coding flag

    int     sync_ssf;           ///< Audio sync word insertion flag

    int     lfe_present;        ///< Low frequency effects flag

    int     predictor_history;  ///< Predictor history flag switch

    int     filter_perfect;     ///< Multirate interpolator switch

    int     source_pcm_res;     ///< Source PCM resolution

    int     es_format;          ///< Extended surround (ES) mastering flag

    int     sumdiff_front;      ///< Front sum/difference flag

    int     sumdiff_surround;   ///< Surround sum/difference flag

    // Primary audio coding header

    int         nsubframes;     ///< Number of subframes

    int         nchannels;      ///< Number of primary audio channels (incl. extension channels)

    int         ch_mask;        ///< Speaker layout mask (incl. LFE and extension channels)

    int8_t      nsubbands[DCA_CHANNELS];                ///< Subband activity count

    int8_t      subband_vq_start[DCA_CHANNELS];         ///< High frequency VQ start subband

    int8_t      joint_intensity_index[DCA_CHANNELS];    ///< Joint intensity coding index

    int8_t      transition_mode_sel[DCA_CHANNELS];      ///< Transient mode code book

    int8_t      scale_factor_sel[DCA_CHANNELS];         ///< Scale factor code book

    int8_t      bit_allocation_sel[DCA_CHANNELS];       ///< Bit allocation quantizer select

    int8_t      quant_index_sel[DCA_CHANNELS][DCA_CODE_BOOKS];  ///< Quantization index codebook select

    int32_t     scale_factor_adj[DCA_CHANNELS][DCA_CODE_BOOKS]; ///< Scale factor adjustment

    // Primary audio coding side information

    int8_t      nsubsubframes[DCA_SUBFRAMES];   ///< Subsubframe count for each subframe

    int8_t      prediction_mode[DCA_CHANNELS][DCA_SUBBANDS_X96];            ///< Prediction mode

    int16_t     prediction_vq_index[DCA_CHANNELS][DCA_SUBBANDS_X96];        ///< Prediction coefficients VQ address

    int8_t      bit_allocation[DCA_CHANNELS][DCA_SUBBANDS_X96];             ///< Bit allocation index

    int8_t      transition_mode[DCA_SUBFRAMES][DCA_CHANNELS][DCA_SUBBANDS]; ///< Transition mode

    int32_t     scale_factors[DCA_CHANNELS][DCA_SUBBANDS][2];               ///< Scale factors (2x for transients and X96)

    int8_t      joint_scale_sel[DCA_CHANNELS];                              ///< Joint subband codebook select

    int32_t     joint_scale_factors[DCA_CHANNELS][DCA_SUBBANDS_X96];        ///< Scale factors for joint subband coding

    // Auxiliary data

    int     prim_dmix_embedded; ///< Auxiliary dynamic downmix flag

    int     prim_dmix_type;     ///< Auxiliary primary channel downmix type

    int     prim_dmix_coeff[DCA_DMIX_CHANNELS_MAX * DCA_CORE_CHANNELS_MAX]; ///< Dynamic downmix code coefficients

    // Core extensions

    int     ext_audio_mask;     ///< Bit mask of fully decoded core extensions

    // XCH extension data

    int     xch_pos;    ///< Bit position of XCH frame in core substream

    // XXCH extension data

    int     xxch_crc_present;       ///< CRC presence flag for XXCH channel set header

    int     xxch_mask_nbits;        ///< Number of bits for loudspeaker mask

    int     xxch_core_mask;         ///< Core loudspeaker activity mask

    int     xxch_spkr_mask;         ///< Loudspeaker layout mask

    int     xxch_dmix_embedded;     ///< Downmix already performed by encoder

    int     xxch_dmix_scale_inv;    ///< Downmix scale factor

    int     xxch_dmix_mask[DCA_XXCH_CHANNELS_MAX];  ///< Downmix channel mapping mask

    int     xxch_dmix_coeff[DCA_XXCH_CHANNELS_MAX * DCA_CORE_CHANNELS_MAX];     ///< Downmix coefficients

    int     xxch_pos;   ///< Bit position of XXCH frame in core substream

    // X96 extension data

    int     x96_rev_no;         ///< X96 revision number

    int     x96_crc_present;    ///< CRC presence flag for X96 channel set header

    int     x96_nchannels;      ///< Number of primary channels in X96 extension

    int     x96_high_res;       ///< X96 high resolution flag

    int     x96_subband_start;  ///< First encoded subband in X96 extension

    int     x96_rand;           ///< Random seed for generating samples for unallocated X96 subbands

    int     x96_pos;            ///< Bit position of X96 frame in core substream

    // Sample buffers

    unsigned int    x96_subband_size;

    int32_t         *x96_subband_buffer;    ///< X96 subband sample buffer base

    int32_t         *x96_subband_samples[DCA_CHANNELS][DCA_SUBBANDS_X96];   ///< X96 subband samples

    unsigned int    subband_size;

    int32_t         *subband_buffer;    ///< Subband sample buffer base

    int32_t         *subband_samples[DCA_CHANNELS][DCA_SUBBANDS];   ///< Subband samples

    int32_t         *lfe_samples;    ///< Decimated LFE samples

    // DSP contexts

    DCADSPData              dcadsp_data[DCA_CHANNELS];    ///< FIR history buffers

    DCADSPContext           *dcadsp;

    DCADCTContext           dcadct;

    FFTContext              imdct[2];

    SynthFilterContext      synth;

    AVFloatDSPContext       *float_dsp;

    AVFixedDSPContext       *fixed_dsp;

    // PCM output data

    unsigned int    output_size;

    void            *output_buffer;                         ///< PCM output buffer base

    int32_t         *output_samples[DCA_SPEAKER_COUNT];     ///< PCM output for fixed point mode

    int32_t         output_history_lfe_fixed;               ///< LFE PCM history for X96 filter

    float           output_history_lfe_float;               ///< LFE PCM history for X96 filter

    int     ch_remap[DCA_SPEAKER_COUNT];   ///< Channel to speaker map

    int     request_mask;   ///< Requested channel layout (for stereo downmix)

    int     npcmsamples;    ///< Number of PCM samples per channel

    int     output_rate;    ///< Output sample rate (1x or 2x header rate)

    int     filter_mode;    ///< Previous filtering mode for detecting changes

} DCACoreDecoder;

{

}

                                          int32_t step_size, int32_t scale, int residual, int len)

{

    // Account for quantizer step size

    // Limit scale factor resolution to 22 bits

    }

    // Scale the samples

    } else {

    }

int ff_dca_core_parse(DCACoreDecoder *s, uint8_t *data, int size);

int ff_dca_core_parse_exss(DCACoreDecoder *s, uint8_t *data, DCAExssAsset *asset);

int ff_dca_core_filter_fixed(DCACoreDecoder *s, int x96_synth);

int ff_dca_core_filter_frame(DCACoreDecoder *s, AVFrame *frame);

av_cold void ff_dca_core_flush(DCACoreDecoder *s);

av_cold int ff_dca_core_init(DCACoreDecoder *s);

av_cold void ff_dca_core_close(DCACoreDecoder *s);

#endif