/*

 * Opus decoder/demuxer common functions

 * Copyright (c) 2012 Andrew D'Addesio

 * Copyright (c) 2013-2014 Mozilla Corporation

 * Copyright (c) 2016 Rostislav Pehlivanov <atomnuker@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

 */

#ifndef AVCODEC_OPUS_CELT_H

#define AVCODEC_OPUS_CELT_H

#include <float.h>

#include "opus.h"

#include "opus_pvq.h"

#include "opusdsp.h"

#include "mdct15.h"

#include "libavutil/float_dsp.h"

#include "libavutil/libm.h"

#include "libavutil/mem_internal.h"

#define CELT_VECTORS                 11

#define CELT_ALLOC_STEPS             6

#define CELT_FINE_OFFSET             21

#define CELT_MAX_FINE_BITS           8

#define CELT_NORM_SCALE              16384

#define CELT_QTHETA_OFFSET           4

#define CELT_QTHETA_OFFSET_TWOPHASE  16

#define CELT_POSTFILTER_MINPERIOD    15

#define CELT_ENERGY_SILENCE          (-28.0f)

typedef struct CeltPVQ CeltPVQ;

enum CeltSpread {

    CELT_SPREAD_NONE,

    CELT_SPREAD_LIGHT,

    CELT_SPREAD_NORMAL,

    CELT_SPREAD_AGGRESSIVE

};

enum CeltBlockSize {

    CELT_BLOCK_120,

    CELT_BLOCK_240,

    CELT_BLOCK_480,

    CELT_BLOCK_960,

    CELT_BLOCK_NB

};

typedef struct CeltBlock {

    float energy[CELT_MAX_BANDS];

    float lin_energy[CELT_MAX_BANDS];

    float error_energy[CELT_MAX_BANDS];

    float prev_energy[2][CELT_MAX_BANDS];

    uint8_t collapse_masks[CELT_MAX_BANDS];

    /* buffer for mdct output + postfilter */

    DECLARE_ALIGNED(32, float, buf)[2048];

    DECLARE_ALIGNED(32, float, coeffs)[CELT_MAX_FRAME_SIZE];

    /* Used by the encoder */

    DECLARE_ALIGNED(32, float, overlap)[FFALIGN(CELT_OVERLAP, 16)];

    DECLARE_ALIGNED(32, float, samples)[FFALIGN(CELT_MAX_FRAME_SIZE, 16)];

    /* postfilter parameters */

    int   pf_period_new;

    float pf_gains_new[3];

    int   pf_period;

    float pf_gains[3];

    int   pf_period_old;

    float pf_gains_old[3];

    float emph_coeff;

} CeltBlock;

struct CeltFrame {

    // constant values that do not change during context lifetime

    AVCodecContext      *avctx;

    MDCT15Context       *imdct[4];

    AVFloatDSPContext   *dsp;

    CeltBlock           block[2];

    CeltPVQ             *pvq;

    OpusDSP             opusdsp;

    int channels;

    int output_channels;

    int apply_phase_inv;

    enum CeltBlockSize size;

    int start_band;

    int end_band;

    int coded_bands;

    int transient;

    int pfilter;

    int skip_band_floor;

    int tf_select;

    int alloc_trim;

    int alloc_boost[CELT_MAX_BANDS];

    int blocks;        /* number of iMDCT blocks in the frame, depends on transient */

    int blocksize;     /* size of each block */

    int silence;       /* Frame is filled with silence */

    int anticollapse_needed; /* Whether to expect an anticollapse bit */

    int anticollapse;  /* Encoded anticollapse bit */

    int intensity_stereo;

    int dual_stereo;

    int flushed;

    uint32_t seed;

    enum CeltSpread spread;

    /* Encoder PF coeffs */

    int pf_octave;

    int pf_period;

    int pf_tapset;

    float pf_gain;

    /* Bit allocation */

    int framebits;

    int remaining;

    int remaining2;

    int caps         [CELT_MAX_BANDS];

    int fine_bits    [CELT_MAX_BANDS];

    int fine_priority[CELT_MAX_BANDS];

    int pulses       [CELT_MAX_BANDS];

    int tf_change    [CELT_MAX_BANDS];

};

/* LCG for noise generation */

{

}

{

    int i;

int ff_celt_init(AVCodecContext *avctx, CeltFrame **f, int output_channels,

                 int apply_phase_inv);

void ff_celt_free(CeltFrame **f);

void ff_celt_flush(CeltFrame *f);

int ff_celt_decode_frame(CeltFrame *f, OpusRangeCoder *rc, float **output,

                         int coded_channels, int frame_size, int startband, int endband);

#endif /* AVCODEC_OPUS_CELT_H */