PeerStreamer

/*

 * DCA compatible decoder

 * Copyright (C) 2004 Gildas Bazin

 * Copyright (C) 2004 Benjamin Zores

 * Copyright (C) 2006 Benjamin Larsson

 * Copyright (C) 2007 Konstantin Shishkov

 *

 * 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

 */

#include <math.h>

#include <stddef.h>

#include <stdio.h>

#include "libavutil/intmath.h"

#include "libavutil/intreadwrite.h"

#include "avcodec.h"

#include "dsputil.h"

#include "fft.h"

#include "get_bits.h"

#include "put_bits.h"

#include "dcadata.h"

#include "dcahuff.h"

#include "dca.h"

#include "synth_filter.h"

#include "dcadsp.h"

//#define TRACE

#define DCA_PRIM_CHANNELS_MAX (7)

#define DCA_SUBBANDS (32)

#define DCA_ABITS_MAX (32)      /* Should be 28 */

#define DCA_SUBSUBFRAMES_MAX (4)

#define DCA_SUBFRAMES_MAX (16)

#define DCA_BLOCKS_MAX (16)

#define DCA_LFE_MAX (3)

enum DCAMode {

    DCA_MONO = 0,

    DCA_CHANNEL,

    DCA_STEREO,

    DCA_STEREO_SUMDIFF,

    DCA_STEREO_TOTAL,

    DCA_3F,

    DCA_2F1R,

    DCA_3F1R,

    DCA_2F2R,

    DCA_3F2R,

    DCA_4F2R

};

/* Tables for mapping dts channel configurations to libavcodec multichannel api.

 * Some compromises have been made for special configurations. Most configurations

 * are never used so complete accuracy is not needed.

 *

 * L = left, R = right, C = center, S = surround, F = front, R = rear, T = total, OV = overhead.

 * S  -> side, when both rear and back are configured move one of them to the side channel

 * OV -> center back

 * All 2 channel configurations -> CH_LAYOUT_STEREO

 */

static const int64_t dca_core_channel_layout[] = {

    CH_FRONT_CENTER,                                               ///< 1, A

    CH_LAYOUT_STEREO,                                              ///< 2, A + B (dual mono)

    CH_LAYOUT_STEREO,                                              ///< 2, L + R (stereo)

    CH_LAYOUT_STEREO,                                              ///< 2, (L+R) + (L-R) (sum-difference)

    CH_LAYOUT_STEREO,                                              ///< 2, LT +RT (left and right total)

    CH_LAYOUT_STEREO|CH_FRONT_CENTER,                              ///< 3, C+L+R

    CH_LAYOUT_STEREO|CH_BACK_CENTER,                               ///< 3, L+R+S

    CH_LAYOUT_STEREO|CH_FRONT_CENTER|CH_BACK_CENTER,               ///< 4, C + L + R+ S

    CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT,                   ///< 4, L + R +SL+ SR

    CH_LAYOUT_STEREO|CH_FRONT_CENTER|CH_SIDE_LEFT|CH_SIDE_RIGHT,   ///< 5, C + L + R+ SL+SR

    CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT|CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER,                 ///< 6, CL + CR + L + R + SL + SR

    CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT|CH_FRONT_CENTER|CH_BACK_CENTER,                                   ///< 6, C + L + R+ LR + RR + OV

    CH_FRONT_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_FRONT_LEFT_OF_CENTER|CH_BACK_CENTER|CH_BACK_LEFT|CH_BACK_RIGHT,   ///< 6, CF+ CR+LF+ RF+LR + RR

    CH_FRONT_LEFT_OF_CENTER|CH_FRONT_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT, ///< 7, CL + C + CR + L + R + SL + SR

    CH_FRONT_LEFT_OF_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT|CH_BACK_LEFT|CH_BACK_RIGHT, ///< 8, CL + CR + L + R + SL1 + SL2+ SR1 + SR2

    CH_FRONT_LEFT_OF_CENTER|CH_FRONT_CENTER|CH_FRONT_RIGHT_OF_CENTER|CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_BACK_CENTER|CH_SIDE_RIGHT, ///< 8, CL + C+ CR + L + R + SL + S+ SR

};

static const int8_t dca_lfe_index[] = {

    1,2,2,2,2,3,2,3,2,3,2,3,1,3,2,3

};

static const int8_t dca_channel_reorder_lfe[][9] = {

    { 0, -1, -1, -1, -1, -1, -1, -1, -1},

    { 0,  1, -1, -1, -1, -1, -1, -1, -1},

    { 0,  1, -1, -1, -1, -1, -1, -1, -1},

    { 0,  1, -1, -1, -1, -1, -1, -1, -1},

    { 0,  1, -1, -1, -1, -1, -1, -1, -1},

    { 2,  0,  1, -1, -1, -1, -1, -1, -1},

    { 0,  1,  3, -1, -1, -1, -1, -1, -1},

    { 2,  0,  1,  4, -1, -1, -1, -1, -1},

    { 0,  1,  3,  4, -1, -1, -1, -1, -1},

    { 2,  0,  1,  4,  5, -1, -1, -1, -1},

    { 3,  4,  0,  1,  5,  6, -1, -1, -1},

    { 2,  0,  1,  4,  5,  6, -1, -1, -1},

    { 0,  6,  4,  5,  2,  3, -1, -1, -1},

    { 4,  2,  5,  0,  1,  6,  7, -1, -1},

    { 5,  6,  0,  1,  7,  3,  8,  4, -1},

    { 4,  2,  5,  0,  1,  6,  8,  7, -1},

};

static const int8_t dca_channel_reorder_lfe_xch[][9] = {

    { 0,  2, -1, -1, -1, -1, -1, -1, -1},

    { 0,  1,  3, -1, -1, -1, -1, -1, -1},

    { 0,  1,  3, -1, -1, -1, -1, -1, -1},

    { 0,  1,  3, -1, -1, -1, -1, -1, -1},

    { 0,  1,  3, -1, -1, -1, -1, -1, -1},

    { 2,  0,  1,  4, -1, -1, -1, -1, -1},

    { 0,  1,  3,  4, -1, -1, -1, -1, -1},

    { 2,  0,  1,  4,  5, -1, -1, -1, -1},

    { 0,  1,  4,  5,  3, -1, -1, -1, -1},

    { 2,  0,  1,  5,  6,  4, -1, -1, -1},

    { 3,  4,  0,  1,  6,  7,  5, -1, -1},

    { 2,  0,  1,  4,  5,  6,  7, -1, -1},

    { 0,  6,  4,  5,  2,  3,  7, -1, -1},

    { 4,  2,  5,  0,  1,  7,  8,  6, -1},

    { 5,  6,  0,  1,  8,  3,  9,  4,  7},

    { 4,  2,  5,  0,  1,  6,  9,  8,  7},

};

static const int8_t dca_channel_reorder_nolfe[][9] = {

    { 0, -1, -1, -1, -1, -1, -1, -1, -1},

    { 0,  1, -1, -1, -1, -1, -1, -1, -1},

    { 0,  1, -1, -1, -1, -1, -1, -1, -1},

    { 0,  1, -1, -1, -1, -1, -1, -1, -1},

    { 0,  1, -1, -1, -1, -1, -1, -1, -1},

    { 2,  0,  1, -1, -1, -1, -1, -1, -1},

    { 0,  1,  2, -1, -1, -1, -1, -1, -1},

    { 2,  0,  1,  3, -1, -1, -1, -1, -1},

    { 0,  1,  2,  3, -1, -1, -1, -1, -1},

    { 2,  0,  1,  3,  4, -1, -1, -1, -1},

    { 2,  3,  0,  1,  4,  5, -1, -1, -1},

    { 2,  0,  1,  3,  4,  5, -1, -1, -1},

    { 0,  5,  3,  4,  1,  2, -1, -1, -1},

    { 3,  2,  4,  0,  1,  5,  6, -1, -1},

    { 4,  5,  0,  1,  6,  2,  7,  3, -1},

    { 3,  2,  4,  0,  1,  5,  7,  6, -1},

};

static const int8_t dca_channel_reorder_nolfe_xch[][9] = {

    { 0,  1, -1, -1, -1, -1, -1, -1, -1},

    { 0,  1,  2, -1, -1, -1, -1, -1, -1},

    { 0,  1,  2, -1, -1, -1, -1, -1, -1},

    { 0,  1,  2, -1, -1, -1, -1, -1, -1},

    { 0,  1,  2, -1, -1, -1, -1, -1, -1},

    { 2,  0,  1,  3, -1, -1, -1, -1, -1},

    { 0,  1,  2,  3, -1, -1, -1, -1, -1},

    { 2,  0,  1,  3,  4, -1, -1, -1, -1},

    { 0,  1,  3,  4,  2, -1, -1, -1, -1},

    { 2,  0,  1,  4,  5,  3, -1, -1, -1},

    { 2,  3,  0,  1,  5,  6,  4, -1, -1},

    { 2,  0,  1,  3,  4,  5,  6, -1, -1},

    { 0,  5,  3,  4,  1,  2,  6, -1, -1},

    { 3,  2,  4,  0,  1,  6,  7,  5, -1},

    { 4,  5,  0,  1,  7,  2,  8,  3,  6},

    { 3,  2,  4,  0,  1,  5,  8,  7,  6},

};

#define DCA_DOLBY 101           /* FIXME */

#define DCA_CHANNEL_BITS 6

#define DCA_CHANNEL_MASK 0x3F

#define DCA_LFE 0x80

#define HEADER_SIZE 14

#define DCA_MAX_FRAME_SIZE 16384

/** Bit allocation */

typedef struct {

    int offset;                 ///< code values offset

    int maxbits[8];             ///< max bits in VLC

    int wrap;                   ///< wrap for get_vlc2()

    VLC vlc[8];                 ///< actual codes

} BitAlloc;

static BitAlloc dca_bitalloc_index;    ///< indexes for samples VLC select

static BitAlloc dca_tmode;             ///< transition mode VLCs

static BitAlloc dca_scalefactor;       ///< scalefactor VLCs

static BitAlloc dca_smpl_bitalloc[11]; ///< samples VLCs

static av_always_inline int get_bitalloc(GetBitContext *gb, BitAlloc *ba, int idx)

{

    return get_vlc2(gb, ba->vlc[idx].table, ba->vlc[idx].bits, ba->wrap) + ba->offset;

}

typedef struct {

    AVCodecContext *avctx;

    /* Frame header */

    int frame_type;             ///< type of the current frame

    int samples_deficit;        ///< deficit sample count

    int crc_present;            ///< crc is present in the bitstream

    int sample_blocks;          ///< number of PCM sample blocks

    int frame_size;             ///< primary frame byte size

    int amode;                  ///< audio channels arrangement

    int sample_rate;            ///< audio sampling rate

    int bit_rate;               ///< transmission bit rate

    int bit_rate_index;         ///< transmission bit rate index

    int downmix;                ///< embedded downmix enabled

    int dynrange;               ///< embedded dynamic range flag

    int timestamp;              ///< embedded time stamp flag

    int aux_data;               ///< auxiliary data flag

    int hdcd;                   ///< source material is mastered in HDCD

    int ext_descr;              ///< extension audio descriptor flag

    int ext_coding;             ///< extended coding flag

    int aspf;                   ///< audio sync word insertion flag

    int lfe;                    ///< low frequency effects flag

    int predictor_history;      ///< predictor history flag

    int header_crc;             ///< header crc check bytes

    int multirate_inter;        ///< multirate interpolator switch

    int version;                ///< encoder software revision

    int copy_history;           ///< copy history

    int source_pcm_res;         ///< source pcm resolution

    int front_sum;              ///< front sum/difference flag

    int surround_sum;           ///< surround sum/difference flag

    int dialog_norm;            ///< dialog normalisation parameter

    /* Primary audio coding header */

    int subframes;              ///< number of subframes

    int total_channels;         ///< number of channels including extensions

    int prim_channels;          ///< number of primary audio channels

    int subband_activity[DCA_PRIM_CHANNELS_MAX];    ///< subband activity count

    int vq_start_subband[DCA_PRIM_CHANNELS_MAX];    ///< high frequency vq start subband

    int joint_intensity[DCA_PRIM_CHANNELS_MAX];     ///< joint intensity coding index

    int transient_huffman[DCA_PRIM_CHANNELS_MAX];   ///< transient mode code book

    int scalefactor_huffman[DCA_PRIM_CHANNELS_MAX]; ///< scale factor code book

    int bitalloc_huffman[DCA_PRIM_CHANNELS_MAX];    ///< bit allocation quantizer select

    int quant_index_huffman[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX]; ///< quantization index codebook select

    float scalefactor_adj[DCA_PRIM_CHANNELS_MAX][DCA_ABITS_MAX];   ///< scale factor adjustment

    /* Primary audio coding side information */

    int subsubframes[DCA_SUBFRAMES_MAX];           ///< number of subsubframes

    int partial_samples[DCA_SUBFRAMES_MAX];        ///< partial subsubframe samples count

    int prediction_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];    ///< prediction mode (ADPCM used or not)

    int prediction_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];      ///< prediction VQ coefs

    int bitalloc[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];           ///< bit allocation index

    int transition_mode[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];    ///< transition mode (transients)

    int scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][2];    ///< scale factors (2 if transient)

    int joint_huff[DCA_PRIM_CHANNELS_MAX];                       ///< joint subband scale factors codebook

    int joint_scale_factor[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS]; ///< joint subband scale factors

    int downmix_coef[DCA_PRIM_CHANNELS_MAX][2];                  ///< stereo downmix coefficients

    int dynrange_coef;                                           ///< dynamic range coefficient

    int high_freq_vq[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS];       ///< VQ encoded high frequency subbands

    float lfe_data[2 * DCA_LFE_MAX * (DCA_BLOCKS_MAX + 4)];      ///< Low frequency effect data

    int lfe_scale_factor;

    /* Subband samples history (for ADPCM) */

    float subband_samples_hist[DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][4];

    DECLARE_ALIGNED(16, float, subband_fir_hist)[DCA_PRIM_CHANNELS_MAX][512];

    DECLARE_ALIGNED(16, float, subband_fir_noidea)[DCA_PRIM_CHANNELS_MAX][32];

    int hist_index[DCA_PRIM_CHANNELS_MAX];

    DECLARE_ALIGNED(16, float, raXin)[32];

    int output;                 ///< type of output

    float add_bias;             ///< output bias

    float scale_bias;           ///< output scale

    DECLARE_ALIGNED(16, float, subband_samples)[DCA_BLOCKS_MAX][DCA_PRIM_CHANNELS_MAX][DCA_SUBBANDS][8];

    DECLARE_ALIGNED(16, float, samples)[(DCA_PRIM_CHANNELS_MAX+1)*256];

    const float *samples_chanptr[DCA_PRIM_CHANNELS_MAX+1];

    uint8_t dca_buffer[DCA_MAX_FRAME_SIZE];

    int dca_buffer_size;        ///< how much data is in the dca_buffer

    const int8_t* channel_order_tab;                             ///< channel reordering table, lfe and non lfe

    GetBitContext gb;

    /* Current position in DCA frame */

    int current_subframe;

    int current_subsubframe;

    /* XCh extension information */

    int xch_present;

    int xch_base_channel;       ///< index of first (only) channel containing XCH data

    int debug_flag;             ///< used for suppressing repeated error messages output

    DSPContext dsp;

    FFTContext imdct;

    SynthFilterContext synth;

    DCADSPContext dcadsp;

} DCAContext;

static const uint16_t dca_vlc_offs[] = {

        0,   512,   640,   768,  1282,  1794,  2436,  3080,  3770,  4454,  5364,

     5372,  5380,  5388,  5392,  5396,  5412,  5420,  5428,  5460,  5492,  5508,

     5572,  5604,  5668,  5796,  5860,  5892,  6412,  6668,  6796,  7308,  7564,

     7820,  8076,  8620,  9132,  9388,  9910, 10166, 10680, 11196, 11726, 12240,

    12752, 13298, 13810, 14326, 14840, 15500, 16022, 16540, 17158, 17678, 18264,

    18796, 19352, 19926, 20468, 21472, 22398, 23014, 23622,

};

static av_cold void dca_init_vlcs(void)

{

    static int vlcs_initialized = 0;

    int i, j, c = 14;

    static VLC_TYPE dca_table[23622][2];

    if (vlcs_initialized)

        return;

    dca_bitalloc_index.offset = 1;

    dca_bitalloc_index.wrap = 2;

    for (i = 0; i < 5; i++) {

        dca_bitalloc_index.vlc[i].table = &dca_table[dca_vlc_offs[i]];

        dca_bitalloc_index.vlc[i].table_allocated = dca_vlc_offs[i + 1] - dca_vlc_offs[i];

        init_vlc(&dca_bitalloc_index.vlc[i], bitalloc_12_vlc_bits[i], 12,

                 bitalloc_12_bits[i], 1, 1,

                 bitalloc_12_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);

    }

    dca_scalefactor.offset = -64;

    dca_scalefactor.wrap = 2;

    for (i = 0; i < 5; i++) {

        dca_scalefactor.vlc[i].table = &dca_table[dca_vlc_offs[i + 5]];

        dca_scalefactor.vlc[i].table_allocated = dca_vlc_offs[i + 6] - dca_vlc_offs[i + 5];

        init_vlc(&dca_scalefactor.vlc[i], SCALES_VLC_BITS, 129,

                 scales_bits[i], 1, 1,

                 scales_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);

    }

    dca_tmode.offset = 0;

    dca_tmode.wrap = 1;

    for (i = 0; i < 4; i++) {

        dca_tmode.vlc[i].table = &dca_table[dca_vlc_offs[i + 10]];

        dca_tmode.vlc[i].table_allocated = dca_vlc_offs[i + 11] - dca_vlc_offs[i + 10];

        init_vlc(&dca_tmode.vlc[i], tmode_vlc_bits[i], 4,

                 tmode_bits[i], 1, 1,

                 tmode_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);

    }

    for (i = 0; i < 10; i++)

        for (j = 0; j < 7; j++){

            if (!bitalloc_codes[i][j]) break;

            dca_smpl_bitalloc[i+1].offset = bitalloc_offsets[i];

            dca_smpl_bitalloc[i+1].wrap = 1 + (j > 4);

            dca_smpl_bitalloc[i+1].vlc[j].table = &dca_table[dca_vlc_offs[c]];

            dca_smpl_bitalloc[i+1].vlc[j].table_allocated = dca_vlc_offs[c + 1] - dca_vlc_offs[c];

            init_vlc(&dca_smpl_bitalloc[i+1].vlc[j], bitalloc_maxbits[i][j],

                     bitalloc_sizes[i],

                     bitalloc_bits[i][j], 1, 1,

                     bitalloc_codes[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC);

            c++;

        }

    vlcs_initialized = 1;

}

static inline void get_array(GetBitContext *gb, int *dst, int len, int bits)

{

    while(len--)

        *dst++ = get_bits(gb, bits);

}

static int dca_parse_audio_coding_header(DCAContext * s, int base_channel)

{

    int i, j;

    static const float adj_table[4] = { 1.0, 1.1250, 1.2500, 1.4375 };

    static const int bitlen[11] = { 0, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3 };

    static const int thr[11] = { 0, 1, 3, 3, 3, 3, 7, 7, 7, 7, 7 };

    s->total_channels    = get_bits(&s->gb, 3) + 1 + base_channel;

    s->prim_channels     = s->total_channels;

    if (s->prim_channels > DCA_PRIM_CHANNELS_MAX)

        s->prim_channels = DCA_PRIM_CHANNELS_MAX;

    for (i = base_channel; i < s->prim_channels; i++) {

        s->subband_activity[i] = get_bits(&s->gb, 5) + 2;

        if (s->subband_activity[i] > DCA_SUBBANDS)

            s->subband_activity[i] = DCA_SUBBANDS;

    }

    for (i = base_channel; i < s->prim_channels; i++) {

        s->vq_start_subband[i] = get_bits(&s->gb, 5) + 1;

        if (s->vq_start_subband[i] > DCA_SUBBANDS)

            s->vq_start_subband[i] = DCA_SUBBANDS;

    }

    get_array(&s->gb, s->joint_intensity + base_channel,     s->prim_channels - base_channel, 3);

    get_array(&s->gb, s->transient_huffman + base_channel,   s->prim_channels - base_channel, 2);

    get_array(&s->gb, s->scalefactor_huffman + base_channel, s->prim_channels - base_channel, 3);

    get_array(&s->gb, s->bitalloc_huffman + base_channel,    s->prim_channels - base_channel, 3);

    /* Get codebooks quantization indexes */

    if (!base_channel)

        memset(s->quant_index_huffman, 0, sizeof(s->quant_index_huffman));

    for (j = 1; j < 11; j++)

        for (i = base_channel; i < s->prim_channels; i++)

            s->quant_index_huffman[i][j] = get_bits(&s->gb, bitlen[j]);

    /* Get scale factor adjustment */

    for (j = 0; j < 11; j++)

        for (i = base_channel; i < s->prim_channels; i++)

            s->scalefactor_adj[i][j] = 1;

    for (j = 1; j < 11; j++)

        for (i = base_channel; i < s->prim_channels; i++)

            if (s->quant_index_huffman[i][j] < thr[j])

                s->scalefactor_adj[i][j] = adj_table[get_bits(&s->gb, 2)];

    if (s->crc_present) {

        /* Audio header CRC check */

        get_bits(&s->gb, 16);

    }

    s->current_subframe = 0;

    s->current_subsubframe = 0;

#ifdef TRACE

    av_log(s->avctx, AV_LOG_DEBUG, "subframes: %i\n", s->subframes);

    av_log(s->avctx, AV_LOG_DEBUG, "prim channels: %i\n", s->prim_channels);

    for (i = base_channel; i < s->prim_channels; i++){

        av_log(s->avctx, AV_LOG_DEBUG, "subband activity: %i\n", s->subband_activity[i]);

        av_log(s->avctx, AV_LOG_DEBUG, "vq start subband: %i\n", s->vq_start_subband[i]);

        av_log(s->avctx, AV_LOG_DEBUG, "joint intensity: %i\n", s->joint_intensity[i]);

        av_log(s->avctx, AV_LOG_DEBUG, "transient mode codebook: %i\n", s->transient_huffman[i]);

        av_log(s->avctx, AV_LOG_DEBUG, "scale factor codebook: %i\n", s->scalefactor_huffman[i]);

        av_log(s->avctx, AV_LOG_DEBUG, "bit allocation quantizer: %i\n", s->bitalloc_huffman[i]);

        av_log(s->avctx, AV_LOG_DEBUG, "quant index huff:");

        for (j = 0; j < 11; j++)

            av_log(s->avctx, AV_LOG_DEBUG, " %i",

                   s->quant_index_huffman[i][j]);

        av_log(s->avctx, AV_LOG_DEBUG, "\n");

        av_log(s->avctx, AV_LOG_DEBUG, "scalefac adj:");

        for (j = 0; j < 11; j++)

            av_log(s->avctx, AV_LOG_DEBUG, " %1.3f", s->scalefactor_adj[i][j]);

        av_log(s->avctx, AV_LOG_DEBUG, "\n");

    }

#endif

  return 0;

}

static int dca_parse_frame_header(DCAContext * s)

{

    init_get_bits(&s->gb, s->dca_buffer, s->dca_buffer_size * 8);

    /* Sync code */

    get_bits(&s->gb, 32);

    /* Frame header */

    s->frame_type        = get_bits(&s->gb, 1);

    s->samples_deficit   = get_bits(&s->gb, 5) + 1;

    s->crc_present       = get_bits(&s->gb, 1);

    s->sample_blocks     = get_bits(&s->gb, 7) + 1;

    s->frame_size        = get_bits(&s->gb, 14) + 1;

    if (s->frame_size < 95)

        return -1;

    s->amode             = get_bits(&s->gb, 6);

    s->sample_rate       = dca_sample_rates[get_bits(&s->gb, 4)];

    if (!s->sample_rate)

        return -1;

    s->bit_rate_index    = get_bits(&s->gb, 5);

    s->bit_rate          = dca_bit_rates[s->bit_rate_index];

    if (!s->bit_rate)

        return -1;

    s->downmix           = get_bits(&s->gb, 1);

    s->dynrange          = get_bits(&s->gb, 1);

    s->timestamp         = get_bits(&s->gb, 1);

    s->aux_data          = get_bits(&s->gb, 1);

    s->hdcd              = get_bits(&s->gb, 1);

    s->ext_descr         = get_bits(&s->gb, 3);

    s->ext_coding        = get_bits(&s->gb, 1);

    s->aspf              = get_bits(&s->gb, 1);

    s->lfe               = get_bits(&s->gb, 2);

    s->predictor_history = get_bits(&s->gb, 1);

    /* TODO: check CRC */

    if (s->crc_present)

        s->header_crc    = get_bits(&s->gb, 16);

    s->multirate_inter   = get_bits(&s->gb, 1);

    s->version           = get_bits(&s->gb, 4);

    s->copy_history      = get_bits(&s->gb, 2);

    s->source_pcm_res    = get_bits(&s->gb, 3);

    s->front_sum         = get_bits(&s->gb, 1);

    s->surround_sum      = get_bits(&s->gb, 1);

    s->dialog_norm       = get_bits(&s->gb, 4);

    /* FIXME: channels mixing levels */

    s->output = s->amode;

    if (s->lfe) s->output |= DCA_LFE;

#ifdef TRACE

    av_log(s->avctx, AV_LOG_DEBUG, "frame type: %i\n", s->frame_type);

    av_log(s->avctx, AV_LOG_DEBUG, "samples deficit: %i\n", s->samples_deficit);

    av_log(s->avctx, AV_LOG_DEBUG, "crc present: %i\n", s->crc_present);

    av_log(s->avctx, AV_LOG_DEBUG, "sample blocks: %i (%i samples)\n",

           s->sample_blocks, s->sample_blocks * 32);

    av_log(s->avctx, AV_LOG_DEBUG, "frame size: %i bytes\n", s->frame_size);

    av_log(s->avctx, AV_LOG_DEBUG, "amode: %i (%i channels)\n",

           s->amode, dca_channels[s->amode]);

    av_log(s->avctx, AV_LOG_DEBUG, "sample rate: %i Hz\n",

           s->sample_rate);

    av_log(s->avctx, AV_LOG_DEBUG, "bit rate: %i bits/s\n",

           s->bit_rate);

    av_log(s->avctx, AV_LOG_DEBUG, "downmix: %i\n", s->downmix);

    av_log(s->avctx, AV_LOG_DEBUG, "dynrange: %i\n", s->dynrange);

    av_log(s->avctx, AV_LOG_DEBUG, "timestamp: %i\n", s->timestamp);

    av_log(s->avctx, AV_LOG_DEBUG, "aux_data: %i\n", s->aux_data);

    av_log(s->avctx, AV_LOG_DEBUG, "hdcd: %i\n", s->hdcd);

    av_log(s->avctx, AV_LOG_DEBUG, "ext descr: %i\n", s->ext_descr);

    av_log(s->avctx, AV_LOG_DEBUG, "ext coding: %i\n", s->ext_coding);

    av_log(s->avctx, AV_LOG_DEBUG, "aspf: %i\n", s->aspf);

    av_log(s->avctx, AV_LOG_DEBUG, "lfe: %i\n", s->lfe);

    av_log(s->avctx, AV_LOG_DEBUG, "predictor history: %i\n",

           s->predictor_history);

    av_log(s->avctx, AV_LOG_DEBUG, "header crc: %i\n", s->header_crc);

    av_log(s->avctx, AV_LOG_DEBUG, "multirate inter: %i\n",

           s->multirate_inter);

    av_log(s->avctx, AV_LOG_DEBUG, "version number: %i\n", s->version);

    av_log(s->avctx, AV_LOG_DEBUG, "copy history: %i\n", s->copy_history);

    av_log(s->avctx, AV_LOG_DEBUG,

           "source pcm resolution: %i (%i bits/sample)\n",

           s->source_pcm_res, dca_bits_per_sample[s->source_pcm_res]);

    av_log(s->avctx, AV_LOG_DEBUG, "front sum: %i\n", s->front_sum);

    av_log(s->avctx, AV_LOG_DEBUG, "surround sum: %i\n", s->surround_sum);

    av_log(s->avctx, AV_LOG_DEBUG, "dialog norm: %i\n", s->dialog_norm);

    av_log(s->avctx, AV_LOG_DEBUG, "\n");

#endif

    /* Primary audio coding header */

    s->subframes         = get_bits(&s->gb, 4) + 1;

    return dca_parse_audio_coding_header(s, 0);

}

static inline int get_scale(GetBitContext *gb, int level, int value)

{

   if (level < 5) {

       /* huffman encoded */

       value += get_bitalloc(gb, &dca_scalefactor, level);

   } else if (level < 8)

       value = get_bits(gb, level + 1);

   return value;

}

static int dca_subframe_header(DCAContext * s, int base_channel, int block_index)

{

    /* Primary audio coding side information */

    int j, k;

    if (!base_channel) {

        s->subsubframes[s->current_subframe] = get_bits(&s->gb, 2) + 1;

        s->partial_samples[s->current_subframe] = get_bits(&s->gb, 3);

    }

    for (j = base_channel; j < s->prim_channels; j++) {

        for (k = 0; k < s->subband_activity[j]; k++)

            s->prediction_mode[j][k] = get_bits(&s->gb, 1);

    }

    /* Get prediction codebook */

    for (j = base_channel; j < s->prim_channels; j++) {

        for (k = 0; k < s->subband_activity[j]; k++) {

            if (s->prediction_mode[j][k] > 0) {

                /* (Prediction coefficient VQ address) */

                s->prediction_vq[j][k] = get_bits(&s->gb, 12);

            }

        }

    }

    /* Bit allocation index */

    for (j = base_channel; j < s->prim_channels; j++) {

        for (k = 0; k < s->vq_start_subband[j]; k++) {

            if (s->bitalloc_huffman[j] == 6)

                s->bitalloc[j][k] = get_bits(&s->gb, 5);

            else if (s->bitalloc_huffman[j] == 5)

                s->bitalloc[j][k] = get_bits(&s->gb, 4);

            else if (s->bitalloc_huffman[j] == 7) {

                av_log(s->avctx, AV_LOG_ERROR,

                       "Invalid bit allocation index\n");

                return -1;

            } else {

                s->bitalloc[j][k] =

                    get_bitalloc(&s->gb, &dca_bitalloc_index, s->bitalloc_huffman[j]);

            }

            if (s->bitalloc[j][k] > 26) {

//                 av_log(s->avctx,AV_LOG_DEBUG,"bitalloc index [%i][%i] too big (%i)\n",

//                          j, k, s->bitalloc[j][k]);

                return -1;

            }

        }

    }

    /* Transition mode */

    for (j = base_channel; j < s->prim_channels; j++) {

        for (k = 0; k < s->subband_activity[j]; k++) {

            s->transition_mode[j][k] = 0;

            if (s->subsubframes[s->current_subframe] > 1 &&

                k < s->vq_start_subband[j] && s->bitalloc[j][k] > 0) {

                s->transition_mode[j][k] =

                    get_bitalloc(&s->gb, &dca_tmode, s->transient_huffman[j]);

            }

        }

    }

    for (j = base_channel; j < s->prim_channels; j++) {

        const uint32_t *scale_table;

        int scale_sum;

        memset(s->scale_factor[j], 0, s->subband_activity[j] * sizeof(s->scale_factor[0][0][0]) * 2);

        if (s->scalefactor_huffman[j] == 6)

            scale_table = scale_factor_quant7;

        else

            scale_table = scale_factor_quant6;

        /* When huffman coded, only the difference is encoded */

        scale_sum = 0;

        for (k = 0; k < s->subband_activity[j]; k++) {

            if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0) {

                scale_sum = get_scale(&s->gb, s->scalefactor_huffman[j], scale_sum);

                s->scale_factor[j][k][0] = scale_table[scale_sum];

            }

            if (k < s->vq_start_subband[j] && s->transition_mode[j][k]) {

                /* Get second scale factor */

                scale_sum = get_scale(&s->gb, s->scalefactor_huffman[j], scale_sum);

                s->scale_factor[j][k][1] = scale_table[scale_sum];

            }

        }

    }

    /* Joint subband scale factor codebook select */

    for (j = base_channel; j < s->prim_channels; j++) {

        /* Transmitted only if joint subband coding enabled */

        if (s->joint_intensity[j] > 0)

            s->joint_huff[j] = get_bits(&s->gb, 3);

    }

    /* Scale factors for joint subband coding */

    for (j = base_channel; j < s->prim_channels; j++) {

        int source_channel;

        /* Transmitted only if joint subband coding enabled */

        if (s->joint_intensity[j] > 0) {

            int scale = 0;

            source_channel = s->joint_intensity[j] - 1;

            /* When huffman coded, only the difference is encoded

             * (is this valid as well for joint scales ???) */

            for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++) {

                scale = get_scale(&s->gb, s->joint_huff[j], 0);

                scale += 64;    /* bias */

                s->joint_scale_factor[j][k] = scale;    /*joint_scale_table[scale]; */

            }

            if (!(s->debug_flag & 0x02)) {

                av_log(s->avctx, AV_LOG_DEBUG,

                       "Joint stereo coding not supported\n");

                s->debug_flag |= 0x02;

            }

        }

    }

    /* Stereo downmix coefficients */

    if (!base_channel && s->prim_channels > 2) {

        if (s->downmix) {

            for (j = base_channel; j < s->prim_channels; j++) {

                s->downmix_coef[j][0] = get_bits(&s->gb, 7);

                s->downmix_coef[j][1] = get_bits(&s->gb, 7);

            }

        } else {

            int am = s->amode & DCA_CHANNEL_MASK;

            for (j = base_channel; j < s->prim_channels; j++) {

                s->downmix_coef[j][0] = dca_default_coeffs[am][j][0];

                s->downmix_coef[j][1] = dca_default_coeffs[am][j][1];

            }

        }

    }

    /* Dynamic range coefficient */

    if (s->dynrange)

        s->dynrange_coef = get_bits(&s->gb, 8);

    /* Side information CRC check word */

    if (s->crc_present) {

        get_bits(&s->gb, 16);

    }

    /*

     * Primary audio data arrays

     */

    /* VQ encoded high frequency subbands */

    for (j = base_channel; j < s->prim_channels; j++)

        for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)

            /* 1 vector -> 32 samples */

            s->high_freq_vq[j][k] = get_bits(&s->gb, 10);

    /* Low frequency effect data */

    if (!base_channel && s->lfe) {

        /* LFE samples */

        int lfe_samples = 2 * s->lfe * (4 + block_index);

        int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

        float lfe_scale;

        for (j = lfe_samples; j < lfe_end_sample; j++) {

            /* Signed 8 bits int */

            s->lfe_data[j] = get_sbits(&s->gb, 8);

        }

        /* Scale factor index */

        s->lfe_scale_factor = scale_factor_quant7[get_bits(&s->gb, 8)];

        /* Quantization step size * scale factor */

        lfe_scale = 0.035 * s->lfe_scale_factor;

        for (j = lfe_samples; j < lfe_end_sample; j++)

            s->lfe_data[j] *= lfe_scale;

    }

#ifdef TRACE

    av_log(s->avctx, AV_LOG_DEBUG, "subsubframes: %i\n", s->subsubframes[s->current_subframe]);

    av_log(s->avctx, AV_LOG_DEBUG, "partial samples: %i\n",

           s->partial_samples[s->current_subframe]);

    for (j = base_channel; j < s->prim_channels; j++) {

        av_log(s->avctx, AV_LOG_DEBUG, "prediction mode:");

        for (k = 0; k < s->subband_activity[j]; k++)

            av_log(s->avctx, AV_LOG_DEBUG, " %i", s->prediction_mode[j][k]);

        av_log(s->avctx, AV_LOG_DEBUG, "\n");

    }

    for (j = base_channel; j < s->prim_channels; j++) {

        for (k = 0; k < s->subband_activity[j]; k++)

                av_log(s->avctx, AV_LOG_DEBUG,

                       "prediction coefs: %f, %f, %f, %f\n",

                       (float) adpcm_vb[s->prediction_vq[j][k]][0] / 8192,

                       (float) adpcm_vb[s->prediction_vq[j][k]][1] / 8192,

                       (float) adpcm_vb[s->prediction_vq[j][k]][2] / 8192,

                       (float) adpcm_vb[s->prediction_vq[j][k]][3] / 8192);

    }

    for (j = base_channel; j < s->prim_channels; j++) {

        av_log(s->avctx, AV_LOG_DEBUG, "bitalloc index: ");

        for (k = 0; k < s->vq_start_subband[j]; k++)

            av_log(s->avctx, AV_LOG_DEBUG, "%2.2i ", s->bitalloc[j][k]);

        av_log(s->avctx, AV_LOG_DEBUG, "\n");

    }

    for (j = base_channel; j < s->prim_channels; j++) {

        av_log(s->avctx, AV_LOG_DEBUG, "Transition mode:");

        for (k = 0; k < s->subband_activity[j]; k++)

            av_log(s->avctx, AV_LOG_DEBUG, " %i", s->transition_mode[j][k]);

        av_log(s->avctx, AV_LOG_DEBUG, "\n");

    }

    for (j = base_channel; j < s->prim_channels; j++) {

        av_log(s->avctx, AV_LOG_DEBUG, "Scale factor:");

        for (k = 0; k < s->subband_activity[j]; k++) {

            if (k >= s->vq_start_subband[j] || s->bitalloc[j][k] > 0)

                av_log(s->avctx, AV_LOG_DEBUG, " %i", s->scale_factor[j][k][0]);

            if (k < s->vq_start_subband[j] && s->transition_mode[j][k])

                av_log(s->avctx, AV_LOG_DEBUG, " %i(t)", s->scale_factor[j][k][1]);

        }

        av_log(s->avctx, AV_LOG_DEBUG, "\n");

    }

    for (j = base_channel; j < s->prim_channels; j++) {

        if (s->joint_intensity[j] > 0) {

            int source_channel = s->joint_intensity[j] - 1;

            av_log(s->avctx, AV_LOG_DEBUG, "Joint scale factor index:\n");

            for (k = s->subband_activity[j]; k < s->subband_activity[source_channel]; k++)

                av_log(s->avctx, AV_LOG_DEBUG, " %i", s->joint_scale_factor[j][k]);

            av_log(s->avctx, AV_LOG_DEBUG, "\n");

        }

    }

    if (!base_channel && s->prim_channels > 2 && s->downmix) {

        av_log(s->avctx, AV_LOG_DEBUG, "Downmix coeffs:\n");

        for (j = 0; j < s->prim_channels; j++) {

            av_log(s->avctx, AV_LOG_DEBUG, "Channel 0,%d = %f\n", j, dca_downmix_coeffs[s->downmix_coef[j][0]]);

            av_log(s->avctx, AV_LOG_DEBUG, "Channel 1,%d = %f\n", j, dca_downmix_coeffs[s->downmix_coef[j][1]]);

        }

        av_log(s->avctx, AV_LOG_DEBUG, "\n");

    }

    for (j = base_channel; j < s->prim_channels; j++)

        for (k = s->vq_start_subband[j]; k < s->subband_activity[j]; k++)

            av_log(s->avctx, AV_LOG_DEBUG, "VQ index: %i\n", s->high_freq_vq[j][k]);

    if (!base_channel && s->lfe) {

        int lfe_samples = 2 * s->lfe * (4 + block_index);

        int lfe_end_sample = 2 * s->lfe * (4 + block_index + s->subsubframes[s->current_subframe]);

        av_log(s->avctx, AV_LOG_DEBUG, "LFE samples:\n");

        for (j = lfe_samples; j < lfe_end_sample; j++)

            av_log(s->avctx, AV_LOG_DEBUG, " %f", s->lfe_data[j]);

        av_log(s->avctx, AV_LOG_DEBUG, "\n");

    }

#endif

    return 0;

}

static void qmf_32_subbands(DCAContext * s, int chans,

                            float samples_in[32][8], float *samples_out,

                            float scale, float bias)

{

    const float *prCoeff;

    int i;

    int sb_act = s->subband_activity[chans];

    int subindex;

    scale *= sqrt(1/8.0);

    /* Select filter */

    if (!s->multirate_inter)    /* Non-perfect reconstruction */

        prCoeff = fir_32bands_nonperfect;

    else                        /* Perfect reconstruction */

        prCoeff = fir_32bands_perfect;

    /* Reconstructed channel sample index */

    for (subindex = 0; subindex < 8; subindex++) {

        /* Load in one sample from each subband and clear inactive subbands */

        for (i = 0; i < sb_act; i++){

            uint32_t v = AV_RN32A(&samples_in[i][subindex]) ^ ((i-1)&2)<<30;

            AV_WN32A(&s->raXin[i], v);

        }

        for (; i < 32; i++)

            s->raXin[i] = 0.0;

        s->synth.synth_filter_float(&s->imdct,

                              s->subband_fir_hist[chans], &s->hist_index[chans],

                              s->subband_fir_noidea[chans], prCoeff,

                              samples_out, s->raXin, scale, bias);

        samples_out+= 32;

    }

}