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/*
 * Wmapro compatible decoder
 * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion
 * Copyright (c) 2008 - 2009 Sascha Sommer, Benjamin Larsson
 *
 * 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  libavcodec/wmaprodec.c
 * @brief wmapro decoder implementation
 * Wmapro is an MDCT based codec comparable to wma standard or AAC.
 * The decoding therefore consists of the following steps:
 * - bitstream decoding
 * - reconstruction of per-channel data
 * - rescaling and inverse quantization
 * - IMDCT
 * - windowing and overlapp-add
 *
 * The compressed wmapro bitstream is split into individual packets.
 * Every such packet contains one or more wma frames.
 * The compressed frames may have a variable length and frames may
 * cross packet boundaries.
 * Common to all wmapro frames is the number of samples that are stored in
 * a frame.
 * The number of samples and a few other decode flags are stored
 * as extradata that has to be passed to the decoder.
 *
 * The wmapro frames themselves are again split into a variable number of
 * subframes. Every subframe contains the data for 2^N time domain samples
 * where N varies between 7 and 12.
 *
 * Example wmapro bitstream (in samples):
 *
 * ||   packet 0           || packet 1 || packet 2      packets
 * ---------------------------------------------------
 * || frame 0      || frame 1       || frame 2    ||    frames
 * ---------------------------------------------------
 * ||   |      |   ||   |   |   |   ||            ||    subframes of channel 0
 * ---------------------------------------------------
 * ||      |   |   ||   |   |   |   ||            ||    subframes of channel 1
 * ---------------------------------------------------
 *
 * The frame layouts for the individual channels of a wma frame does not need
 * to be the same.
 *
 * However, if the offsets and lengths of several subframes of a frame are the
 * same, the subframes of the channels can be grouped.
 * Every group may then use special coding techniques like M/S stereo coding
 * to improve the compression ratio. These channel transformations do not
 * need to be applied to a whole subframe. Instead, they can also work on
 * individual scale factor bands (see below).
 * The coefficients that carry the audio signal in the frequency domain
 * are transmitted as huffman-coded vectors with 4, 2 and 1 elements.
 * In addition to that, the encoder can switch to a runlevel coding scheme
 * by transmitting subframe_length / 128 zero coefficients.
 *
 * Before the audio signal can be converted to the time domain, the
 * coefficients have to be rescaled and inverse quantized.
 * A subframe is therefore split into several scale factor bands that get
 * scaled individually.
 * Scale factors are submitted for every frame but they might be shared
 * between the subframes of a channel. Scale factors are initially DPCM-coded.
 * Once scale factors are shared, the differences are transmitted as runlevel
 * codes.
 * Every subframe length and offset combination in the frame layout shares a
 * common quantization factor that can be adjusted for every channel by a
 * modifier.
 * After the inverse quantization, the coefficients get processed by an IMDCT.
 * The resulting values are then windowed with a sine window and the first half
 * of the values are added to the second half of the output from the previous
 * subframe in order to reconstruct the output samples.
 */

#include "ffmpeg_get_bits.h"
#include "ffmpeg_put_bits.h"
#include "wmaprodata.h"
#include "wma.h"
#include "wmaprodec.h"
//#include "wmapro_mdct.h"
#include "mdct_tables.h"
#include "quant.h"
#include "wmapro_math.h"
#include "codecs.h"
#include "codeclib.h"
#include "../libasf/asf.h"

/* Uncomment the following line to enable some debug output */
//#define WMAPRO_DUMP_CTX_EN

#undef DEBUGF
#ifdef WMAPRO_DUMP_CTX_EN
#   define DEBUGF printf
#else
#   define DEBUGF(...)
#endif

/* Some defines to make it compile */
#define AVERROR_INVALIDDATA  -1
#define AVERROR_PATCHWELCOME -2
#define av_log_ask_for_sample(...)

/* Taken from avcodec.h */
#define FF_INPUT_BUFFER_PADDING_SIZE 8

/* Taken from libavutil/mem.h */
#define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (n))) v

/* Taken from libavutil/common.h */
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
#define FFMAX(a,b) ((a) > (b) ? (a) : (b))

/* Define some multiple used constants */
#define SQRT2_FRACT16   0x00016A0A /* 0x00016A0A = (sqrt(2)*(1<<16)) */
#define COS_PI4_FRACT16 0x0000B505 /* 0x0000B505 = (cos(pi/4)<<16) */
#define ONE_FRACT16     0x00010000 /* 0x00010000 = (1<<16) */

/* Enable multichannel for large-memory targets only */
#if (MEMORYSIZE > 2)
#define WMAPRO_MAX_CHANNELS    8                             ///< max number of handled channels
#else
#define WMAPRO_MAX_CHANNELS    2                             ///< max number of handled channels
#endif

/* Current decoder limitations */
#define MAX_SUBFRAMES  32                                    ///< max number of subframes per channel
#define MAX_BANDS      29                                    ///< max number of scale factor bands
#define MAX_FRAMESIZE  32768                                 ///< maximum compressed frame size

#define WMAPRO_BLOCK_MAX_BITS 12                                           ///< log2 of max block size
#define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS)                 ///< maximum block size
#define WMAPRO_BLOCK_SIZES    (WMAPRO_BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) ///< possible block sizes
#define WMAPRO_OUT_BUF_SIZE   (WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2)


#define VLCBITS            9
#define SCALEVLCBITS       8
#define VEC4MAXDEPTH    ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS)
#define VEC2MAXDEPTH    ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS)
#define VEC1MAXDEPTH    ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS)
#define SCALEMAXDEPTH   ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS)
#define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS)

static VLC              sf_vlc;           ///< scale factor DPCM vlc
static VLC              sf_rl_vlc;        ///< scale factor run length vlc
static VLC              vec4_vlc;         ///< 4 coefficients per symbol
static VLC              vec2_vlc;         ///< 2 coefficients per symbol
static VLC              vec1_vlc;         ///< 1 coefficient per symbol
static VLC              coef_vlc[2];      ///< coefficient run length vlc codes
//static float            sin64[33];        ///< sinus table for decorrelation

/* Global defined arrays to allow IRAM usage for some models. */
static int32_t g_tmp[WMAPRO_BLOCK_MAX_SIZE] IBSS_ATTR_WMAPRO_LARGE_IRAM;
static int32_t g_out_ch0[WMAPRO_OUT_BUF_SIZE] IBSS_ATTR;
static int32_t g_out_ch1[WMAPRO_OUT_BUF_SIZE] IBSS_ATTR_WMAPRO_LARGE_IRAM;
#if (WMAPRO_MAX_CHANNELS > 2)
    static int32_t g_out_multichannel[WMAPRO_MAX_CHANNELS-2][WMAPRO_OUT_BUF_SIZE];
#endif

/**
 * @brief frame specific decoder context for a single channel
 */
typedef struct {
    int16_t  prev_block_len;                          ///< length of the previous block
    uint8_t  transmit_coefs;
    uint8_t  num_subframes;
    uint16_t subframe_len[MAX_SUBFRAMES];             ///< subframe length in samples
    uint16_t subframe_offset[MAX_SUBFRAMES];          ///< subframe positions in the current frame
    uint8_t  cur_subframe;                            ///< current subframe number
    uint16_t decoded_samples;                         ///< number of already processed samples
    uint8_t  grouped;                                 ///< channel is part of a group
    int      quant_step;                              ///< quantization step for the current subframe
    int8_t   reuse_sf;                                ///< share scale factors between subframes
    int8_t   scale_factor_step;                       ///< scaling step for the current subframe
    int      max_scale_factor;                        ///< maximum scale factor for the current subframe
    int      saved_scale_factors[2][MAX_BANDS];       ///< resampled and (previously) transmitted scale factor values
    int8_t   scale_factor_idx;                        ///< index for the transmitted scale factor values (used for resampling)
    int*     scale_factors;                           ///< pointer to the scale factor values used for decoding
    uint8_t  table_idx;                               ///< index in sf_offsets for the scale factor reference block
    int32_t* coeffs;                                  ///< pointer to the subframe decode buffer
    int32_t* out;                                     ///< output buffer
} WMAProChannelCtx;

/**
 * @brief channel group for channel transformations
 */
typedef struct {
    uint8_t num_channels;                                     ///< number of channels in the group
    int8_t  transform;                                        ///< transform on / off
    int8_t  transform_band[MAX_BANDS];                        ///< controls if the transform is enabled for a certain band
    //float   decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS];
    int32_t*  channel_data[WMAPRO_MAX_CHANNELS];                ///< transformation coefficients
    int32_t   fixdecorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS];
} WMAProChannelGrp;

/**
 * @brief main decoder context
 */
typedef struct WMAProDecodeCtx {
    /* generic decoder variables */
    uint8_t          frame_data[MAX_FRAMESIZE +
                      FF_INPUT_BUFFER_PADDING_SIZE];///< compressed frame data
    PutBitContext    pb;                            ///< context for filling the frame_data buffer
    int32_t*         tmp;                           ///< IMDCT input buffer

    /* frame size dependent frame information (set during initialization) */
    uint32_t         decode_flags;                  ///< used compression features
    uint8_t          len_prefix;                    ///< frame is prefixed with its length
    uint8_t          dynamic_range_compression;     ///< frame contains DRC data
    uint8_t          bits_per_sample;               ///< integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1.0])
    uint16_t         samples_per_frame;             ///< number of samples to output
    uint16_t         log2_frame_size;
    int8_t           num_channels;                  ///< number of channels in the stream (same as AVCodecContext.num_channels)
    int8_t           lfe_channel;                   ///< lfe channel index
    uint8_t          max_num_subframes;
    uint8_t          subframe_len_bits;             ///< number of bits used for the subframe length
    uint8_t          max_subframe_len_bit;          ///< flag indicating that the subframe is of maximum size when the first subframe length bit is 1
    uint16_t         min_samples_per_subframe;
    int8_t           num_sfb[WMAPRO_BLOCK_SIZES];   ///< scale factor bands per block size
    int16_t          sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS];                    ///< scale factor band offsets (multiples of 4)
    int8_t           sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor resample matrix
    int16_t          subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; ///< subwoofer cutoff values

    /* packet decode state */
    GetBitContext    pgb;                           ///< bitstream reader context for the packet
    uint8_t          packet_offset;                 ///< frame offset in the packet
    uint8_t          packet_sequence_number;        ///< current packet number
    int              num_saved_bits;                ///< saved number of bits
    int              frame_offset;                  ///< frame offset in the bit reservoir
    int              subframe_offset;               ///< subframe offset in the bit reservoir
    uint8_t          packet_loss;                   ///< set in case of bitstream error
    uint8_t          packet_done;                   ///< set when a packet is fully decoded

    /* frame decode state */
    uint32_t         frame_num;                     ///< current frame number
    GetBitContext    gb;                            ///< bitstream reader context
    int              buf_bit_size;                  ///< buffer size in bits
    int32_t          samples;
    int32_t*         samples_end;                   ///< maximum samplebuffer pointer
    uint8_t          drc_gain;                      ///< gain for the DRC tool
    int8_t           skip_frame;                    ///< skip output step
    int8_t           parsed_all_subframes;          ///< all subframes decoded?

    /* subframe/block decode state */
    int16_t          subframe_len;                  ///< current subframe length
    int8_t           channels_for_cur_subframe;     ///< number of channels that contain the subframe
    int8_t           channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS];
    int8_t           num_bands;                     ///< number of scale factor bands
    int16_t*         cur_sfb_offsets;               ///< sfb offsets for the current block
    uint8_t          table_idx;                     ///< index for the num_sfb, sfb_offsets, sf_offsets and subwoofer_cutoffs tables
    int8_t           esc_len;                       ///< length of escaped coefficients

    uint8_t          num_chgroups;                  ///< number of channel groups
    WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS];  ///< channel group information

    WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS];  ///< per channel data
} WMAProDecodeCtx;

/* static decode context, to avoid malloc */
static WMAProDecodeCtx globWMAProDecCtx;

/**
 *@brief helper function to print the most important members of the context
 *@param s context
 */
#ifdef WMAPRO_DUMP_CTX_EN
static void  dump_context(WMAProDecodeCtx *s)
{
#define PRINT(a, b)     printf(" %s = %d\n", a, b);
#define PRINT_HEX(a, b) printf(" %s = %x\n", a, b);

    PRINT("ed sample bit depth", s->bits_per_sample);
    PRINT_HEX("ed decode flags", s->decode_flags);
    PRINT("samples per frame",   s->samples_per_frame);
    PRINT("log2 frame size",     s->log2_frame_size);
    PRINT("max num subframes",   s->max_num_subframes);
    PRINT("len prefix",          s->len_prefix);
    PRINT("num channels",        s->num_channels);
}
#endif

/**
 *@brief Initialize the decoder.
 *@param avctx codec context
 *@return 0 on success, -1 otherwise
 */
int decode_init(asf_waveformatex_t *wfx)
{
    memset(&globWMAProDecCtx, 0, sizeof(WMAProDecodeCtx));
    WMAProDecodeCtx *s = &globWMAProDecCtx;
    uint8_t *edata_ptr = wfx->data;
    unsigned int channel_mask;
    int i;
    int log2_max_num_subframes;
    int num_possible_block_sizes;
    
    /* Use globally defined array. Allows IRAM usage for models with large IRAM. */
    s->tmp = g_tmp;
    
    /* Use globally defined arrays. Allows IRAM usage for up to 2 channels. */
    s->channel[0].out = g_out_ch0;
    s->channel[1].out = g_out_ch1;
#if (WMAPRO_MAX_CHANNELS > 2)
    for (i=2; i<WMAPRO_MAX_CHANNELS; ++i)
        s->channel[i].out = g_out_multichannel[i-2];
#endif

#if defined(CPU_COLDFIRE)
    coldfire_set_macsr(EMAC_FRACTIONAL | EMAC_SATURATE);
#endif

    init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);

    if (wfx->datalen >= 18) {
        s->decode_flags    = AV_RL16(edata_ptr+14);
        channel_mask       = AV_RL32(edata_ptr+2);
        s->bits_per_sample = AV_RL16(edata_ptr);
        /** dump the extradata */
        for (i = 0; i < wfx->datalen; i++)
            DEBUGF("[%x] ", wfx->data[i]);
        DEBUGF("\n");

    } else {
        DEBUGF("Unknown extradata size\n");
        return AVERROR_INVALIDDATA;
    }

    /** generic init */
    s->log2_frame_size = av_log2(wfx->blockalign) + 4;

    /** frame info */
    s->skip_frame  = 1; /** skip first frame */
    s->packet_loss = 1;
    s->len_prefix  = (s->decode_flags & 0x40);

    if (!s->len_prefix) {
        DEBUGF("no length prefix\n");
        return AVERROR_INVALIDDATA;
    }

    /** get frame len */
    s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(wfx->rate,
                                                          3, s->decode_flags);

    /** init previous block len */
    for (i = 0; i < wfx->channels; i++)
        s->channel[i].prev_block_len = s->samples_per_frame;

    /** subframe info */
    log2_max_num_subframes       = ((s->decode_flags & 0x38) >> 3);
    s->max_num_subframes         = 1 << log2_max_num_subframes;
    if (s->max_num_subframes == 16)
        s->max_subframe_len_bit = 1;
    s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1;

    num_possible_block_sizes     = log2_max_num_subframes + 1;
    s->min_samples_per_subframe  = s->samples_per_frame / s->max_num_subframes;
    s->dynamic_range_compression = (s->decode_flags & 0x80);

    if (s->max_num_subframes > MAX_SUBFRAMES) {
        DEBUGF("invalid number of subframes %i\n",
               s->max_num_subframes);
        return AVERROR_INVALIDDATA;
    }

    s->num_channels = wfx->channels;

    /** extract lfe channel position */
    s->lfe_channel = -1;

    if (channel_mask & 8) {
        unsigned int mask;
        for (mask = 1; mask < 16; mask <<= 1) {
            if (channel_mask & mask)
                ++s->lfe_channel;
        }
    }

    if (s->num_channels < 0) {
        DEBUGF("invalid number of channels %d\n", s->num_channels);
        return AVERROR_INVALIDDATA;
    } else if (s->num_channels > WMAPRO_MAX_CHANNELS) {
        DEBUGF("unsupported number of channels\n");
        return AVERROR_PATCHWELCOME;
    }

    INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE,
                    scale_huffbits, 1, 1,
                    scale_huffcodes, 2, 2, 616);

    INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE,
                    scale_rl_huffbits, 1, 1,
                    scale_rl_huffcodes, 4, 4, 1406);

    INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE,
                    coef0_huffbits, 1, 1,
                    coef0_huffcodes, 4, 4, 2108);

    INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE,
                    coef1_huffbits, 1, 1,
                    coef1_huffcodes, 4, 4, 3912);

    INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE,
                    vec4_huffbits, 1, 1,
                    vec4_huffcodes, 2, 2, 604);

    INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE,
                    vec2_huffbits, 1, 1,
                    vec2_huffcodes, 2, 2, 562);

    INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE,
                    vec1_huffbits, 1, 1,
                    vec1_huffcodes, 2, 2, 562);

    /** calculate number of scale factor bands and their offsets
        for every possible block size */
    for (i = 0; i < num_possible_block_sizes; i++) {
        int subframe_len = s->samples_per_frame >> i;
        int x;
        int band = 1;

        s->sfb_offsets[i][0] = 0;

        for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) {
            int offset = (subframe_len * 2 * critical_freq[x])
                          / wfx->rate + 2;
            offset &= ~3;
            if (offset > s->sfb_offsets[i][band - 1])
                s->sfb_offsets[i][band++] = offset;
        }
        s->sfb_offsets[i][band - 1] = subframe_len;
        s->num_sfb[i]               = band - 1;
    }


    /** Scale factors can be shared between blocks of different size
        as every block has a different scale factor band layout.
        The matrix sf_offsets is needed to find the correct scale factor.
     */

    for (i = 0; i < num_possible_block_sizes; i++) {
        int b;
        for (b = 0; b < s->num_sfb[i]; b++) {
            int x;
            int offset = ((s->sfb_offsets[i][b]
                           + s->sfb_offsets[i][b + 1] - 1) << i) >> 1;
            for (x = 0; x < num_possible_block_sizes; x++) {
                int v = 0;
                while (s->sfb_offsets[x][v + 1] << x < offset)
                    ++v;
                s->sf_offsets[i][x][b] = v;
            }
        }
    }

    /** calculate subwoofer cutoff values */
    for (i = 0; i < num_possible_block_sizes; i++) {
        int block_size = s->samples_per_frame >> i;
        int cutoff = (440*block_size + 3 * (wfx->rate >> 1) - 1)
                     / wfx->rate;
        s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size);
    }
    
#if 0
    /** calculate sine values for the decorrelation matrix */
    for (i = 0; i < 33; i++)
        sin64[i] = sin(i*M_PI / 64.0);
#endif 

#ifdef WMAPRO_DUMP_CTX_EN
    dump_context(s);
#endif
    return 0;
}

/**
 *@brief Decode the subframe length.
 *@param s context
 *@param offset sample offset in the frame
 *@return decoded subframe length on success, < 0 in case of an error
 */
static int decode_subframe_length(WMAProDecodeCtx *s, int offset)
{
    int frame_len_shift = 0;
    int subframe_len;

    /** no need to read from the bitstream when only one length is possible */
    if (offset == s->samples_per_frame - s->min_samples_per_subframe)
        return s->min_samples_per_subframe;

    /** 1 bit indicates if the subframe is of maximum length */
    if (s->max_subframe_len_bit) {
        if (get_bits1(&s->gb))
            frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1);
    } else
        frame_len_shift = get_bits(&s->gb, s->subframe_len_bits);

    subframe_len = s->samples_per_frame >> frame_len_shift;

    /** sanity check the length */
    if (subframe_len < s->min_samples_per_subframe ||
        subframe_len > s->samples_per_frame) {
        DEBUGF("broken frame: subframe_len %i\n",
               subframe_len);
        return AVERROR_INVALIDDATA;
    }
    return subframe_len;
}

/**
 *@brief Decode how the data in the frame is split into subframes.
 *       Every WMA frame contains the encoded data for a fixed number of
 *       samples per channel. The data for every channel might be split
 *       into several subframes. This function will reconstruct the list of
 *       subframes for every channel.
 *
 *       If the subframes are not evenly split, the algorithm estimates the
 *       channels with the lowest number of total samples.
 *       Afterwards, for each of these channels a bit is read from the
 *       bitstream that indicates if the channel contains a subframe with the
 *       next subframe size that is going to be read from the bitstream or not.
 *       If a channel contains such a subframe, the subframe size gets added to
 *       the channel's subframe list.
 *       The algorithm repeats these steps until the frame is properly divided
 *       between the individual channels.
 *
 *@param s context
 *@return 0 on success, < 0 in case of an error
 */
static int decode_tilehdr(WMAProDecodeCtx *s)
{
    uint16_t num_samples[WMAPRO_MAX_CHANNELS];        /** sum of samples for all currently known subframes of a channel */
    uint8_t  contains_subframe[WMAPRO_MAX_CHANNELS];  /** flag indicating if a channel contains the current subframe */
    int channels_for_cur_subframe = s->num_channels;  /** number of channels that contain the current subframe */
    int fixed_channel_layout = 0;                     /** flag indicating that all channels use the same subframe offsets and sizes */
    int min_channel_len = 0;                          /** smallest sum of samples (channels with this length will be processed first) */
    int c;

    /* Should never consume more than 3073 bits (256 iterations for the
     * while loop when always the minimum amount of 128 samples is substracted
     * from missing samples in the 8 channel case).
     * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS  + 4)
     */

    /** reset tiling information */
    for (c = 0; c < s->num_channels; c++)
        s->channel[c].num_subframes = 0;

    memset(num_samples, 0, sizeof(num_samples));

    if (s->max_num_subframes == 1 || get_bits1(&s->gb))
        fixed_channel_layout = 1;

    /** loop until the frame data is split between the subframes */
    do {
        int subframe_len;

        /** check which channels contain the subframe */
        for (c = 0; c < s->num_channels; c++) {
            if (num_samples[c] == min_channel_len) {
                if (fixed_channel_layout || channels_for_cur_subframe == 1 ||
                   (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe))
                    contains_subframe[c] = 1;
                else
                    contains_subframe[c] = get_bits1(&s->gb);
            } else
                contains_subframe[c] = 0;
        }

        /** get subframe length, subframe_len == 0 is not allowed */
        if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0)
            return AVERROR_INVALIDDATA;

        /** add subframes to the individual channels and find new min_channel_len */
        min_channel_len += subframe_len;
        for (c = 0; c < s->num_channels; c++) {
            WMAProChannelCtx* chan = &s->channel[c];

            if (contains_subframe[c]) {
                if (chan->num_subframes >= MAX_SUBFRAMES) { 
                    DEBUGF("broken frame: num subframes > 31\n");
                    return AVERROR_INVALIDDATA;
                }
                chan->subframe_len[chan->num_subframes] = subframe_len;
                num_samples[c] += subframe_len;
                ++chan->num_subframes;
                if (num_samples[c] > s->samples_per_frame) {
                    DEBUGF("broken frame: "
                           "channel len > samples_per_frame\n");
                    return AVERROR_INVALIDDATA;
                }
            } else if (num_samples[c] <= min_channel_len) {
                if (num_samples[c] < min_channel_len) {
                    channels_for_cur_subframe = 0;
                    min_channel_len = num_samples[c];
                }
                ++channels_for_cur_subframe;
            }
        }
    } while (min_channel_len < s->samples_per_frame);

    for (c = 0; c < s->num_channels; c++) {
        int i;
        int offset = 0;
        for (i = 0; i < s->channel[c].num_subframes; i++) {
            DEBUGF("frame[%i] channel[%i] subframe[%i]"
                    " len %i\n", s->frame_num, c, i,
                    s->channel[c].subframe_len[i]);
            s->channel[c].subframe_offset[i] = offset;
            offset += s->channel[c].subframe_len[i];
        }
    }

    return 0;
}

#if 0
/**
 *@brief Calculate a decorrelation matrix from the bitstream parameters.
 *@param s codec context
 *@param chgroup channel group for which the matrix needs to be calculated
 */
static void decode_decorrelation_matrix(WMAProDecodeCtx *s,
                                        WMAProChannelGrp *chgroup)
{
    int i;
    int offset = 0;
    int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS];
    memset(chgroup->decorrelation_matrix, 0, s->num_channels *
           s->num_channels * sizeof(*chgroup->decorrelation_matrix));

    for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++)
        rotation_offset[i] = get_bits(&s->gb, 6);

    for (i = 0; i < chgroup->num_channels; i++) {
        chgroup->decorrelation_matrix[chgroup->num_channels * i + i] =
            get_bits1(&s->gb) ? 1.0 : -1.0;
            
        if(chgroup->decorrelation_matrix[chgroup->num_channels * i + i] > 0)
            chgroup->fixdecorrelation_matrix[chgroup->num_channels * i + i] =  ONE_FRACT16;
        else
            chgroup->fixdecorrelation_matrix[chgroup->num_channels * i + i] = -ONE_FRACT16;
    }

    for (i = 1; i < chgroup->num_channels; i++) {
        int x;
        for (x = 0; x < i; x++) {
            int y;
            for (y = 0; y < i + 1; y++) {
                float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y];
                float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y];
                int32_t f1 = chgroup->fixdecorrelation_matrix[x * chgroup->num_channels + y];
                int32_t f2 = chgroup->fixdecorrelation_matrix[i * chgroup->num_channels + y];
                int n = rotation_offset[offset + x];
                float sinv;
                float cosv;
                int32_t fixsinv;
                int32_t fixcosv;

                if (n < 32) {
                    sinv = sin64[n];
                    cosv = sin64[32 - n];
                    fixsinv = fixed_sin64[n];
                    fixcosv = fixed_sin64[32-n];
                } else {
                    sinv =  sin64[64 -  n];
                    cosv = -sin64[n  - 32];
                    fixsinv = fixed_sin64[64-n];
                    fixcosv = -fixed_sin64[n-32];
                }

                chgroup->decorrelation_matrix[y + x * chgroup->num_channels] =
                                               (v1 * sinv) - (v2 * cosv);
                chgroup->decorrelation_matrix[y + i * chgroup->num_channels] =
                                               (v1 * cosv) + (v2 * sinv);
                chgroup->fixdecorrelation_matrix[y + x * chgroup->num_channels] =
                                               fixmul31(f1, fixsinv) - fixmul31(f2, fixcosv);
                chgroup->fixdecorrelation_matrix[y + i * chgroup->num_channels] =
                                               fixmul31(f1, fixcosv) + fixmul31(f2, fixsinv);
                                               
            }
        }
        offset += i;
    }
}
#endif

/**
 *@brief Decode channel transformation parameters
 *@param s codec context
 *@return 0 in case of success, < 0 in case of bitstream errors
 */
static int decode_channel_transform(WMAProDecodeCtx* s)
{
    int i;
    /* should never consume more than 1921 bits for the 8 channel case
     * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS
     * + MAX_CHANNELS + MAX_BANDS + 1)
     */

    /** in the one channel case channel transforms are pointless */
    s->num_chgroups = 0;
    if (s->num_channels > 1) {
        int remaining_channels = s->channels_for_cur_subframe;

        if (get_bits1(&s->gb)) {
                                 DEBUGF("unsupported channel transform bit\n");
            return AVERROR_INVALIDDATA;
        }

        for (s->num_chgroups = 0; remaining_channels &&
             s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) {
            WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups];
            int32_t** channel_data = chgroup->channel_data;
            chgroup->num_channels = 0;
            chgroup->transform = 0;

            /** decode channel mask */
            if (remaining_channels > 2) {
                for (i = 0; i < s->channels_for_cur_subframe; i++) {
                    int channel_idx = s->channel_indexes_for_cur_subframe[i];
                    if (!s->channel[channel_idx].grouped
                        && get_bits1(&s->gb)) {
                        ++chgroup->num_channels;
                        s->channel[channel_idx].grouped = 1;
                        *channel_data++    = s->channel[channel_idx].coeffs;
                    }
                }
            } else {
                chgroup->num_channels = remaining_channels;
                for (i = 0; i < s->channels_for_cur_subframe; i++) {
                    int channel_idx = s->channel_indexes_for_cur_subframe[i];
                    if (!s->channel[channel_idx].grouped)
                        *channel_data++    = s->channel[channel_idx].coeffs;
                    s->channel[channel_idx].grouped = 1;
                }
            }

            /** decode transform type */
            if (chgroup->num_channels == 2) {
                if (get_bits1(&s->gb)) {
                    if (get_bits1(&s->gb)) {
                        DEBUGF("unsupported channel transform type\n");
                    }
                } else {
                    chgroup->transform = 1;
                    if (s->num_channels == 2) {
                        chgroup->fixdecorrelation_matrix[0] =  ONE_FRACT16;
                        chgroup->fixdecorrelation_matrix[1] = -ONE_FRACT16;
                        chgroup->fixdecorrelation_matrix[2] =  ONE_FRACT16;
                        chgroup->fixdecorrelation_matrix[3] =  ONE_FRACT16;


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