third_party_ffmpeg/libavcodec/ra288.c

/*
 * RealAudio 2.0 (28.8K)
 * Copyright (c) 2003 the ffmpeg project
 *
 * This library 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 of the License, or (at your option) any later version.
 *
 * This library 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 this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "avcodec.h"
 
typedef struct {
	float	history[8];
	float	output[40];
	float	pr1[36];
	float	pr2[10];
	int	phase, phasep;

	float st1a[111],st1b[37],st1[37];
	float st2a[38],st2b[11],st2[11];
	float sb[41];
	float lhist[10];
} Real288_internal;

const float amptable[8]={ 0.515625, 0.90234375, 1.57910156, 2.76342773,
                         -0.515625,-0.90234375,-1.57910156,-2.76342773 };

const float codetable[640]={
	 0.326171875,	-1.4404296875,	-0.6123046875,	-0.8740234375,	-1.24658203125,
	-2.45703125,	-2.23486328125,	-0.51025390625,	 1.419921875,	 1.6201171875,
	-1.37646484375,	-1.30712890625,	-0.462890625,	-1.37939453125,	-2.1728515625,
	-3.26123046875,	-0.166015625,	 0.7236328125,	-0.623046875,	 0.6162109375,
	-0.2744140625,	-3.29931640625,	 0.62548828125,	 0.08740234375,	-0.6220703125,
	-1.2265625,	-3.4814453125,	-2.40478515625,	 3.37548828125,	 1.17724609375,
	-1.2099609375,	-0.076171875,	 2.28662109375,	-1.89111328125,	 0,
	-4.0078125,	 1.044921875,	-0.2333984375,	-1.35986328125,	 0.26025390625,
	 0.92236328125,	 1.34716796875,	 0.67431640625,	-3.39599609375,	-2.88720703125,
	 2.4814453125,	-1.201171875,	-2.8212890625,	 0.87744140625,	 0.27734375,
	-1.078125,	-1.61572265625,	-2.20849609375,	-3.044921875,	-3.66455078125,
	-1.32763671875,	 2.1279296875,	-1.458984375,	-0.56103515625,	 1.30078125,
	 0.61474609375,	 0.48583984375,	 1.32373046875,	-1.203125,	-5.0732421875,
	 0.8408203125,	-3.69580078125,	-1.3388671875,	 1.06005859375,	-1.13720703125,
	 0.50390625,	 0.36474609375,	-0.4189453125,	-3.8798828125,	-6.27099609375,
	 1.5166015625,	 2.37109375,	-2.04736328125,	-1.24072265625,	 0.50537109375,
	 0.9091796875,	-0.46875,	-3.236328125,	 0.2001953125,	 2.8720703125,
	-1.21728515625,	-1.283203125,	-1.953125,	-0.029296875,	 3.5166015625,
	-1.3046875,	 0.7060546875,	 0.75,		-1.87060546875,	 0.60205078125,
	-2.5888671875,	 3.375,		 0.77587890625,	-2.04443359375,	 1.78955078125,
	-1.6875,	-3.9892578125,	-3.76416015625,	 0.67578125,	 2.2939453125,
	-2.29443359375,	-3.03173828125,	-5.45703125,	 3.95703125,	 8.2177734375,
	 0.4541015625,	 3.419921875,	 0.61962890625,	-4.38330078125,	 1.25341796875,
	 2.27001953125,	 5.763671875,	 1.68017578125,	-2.76220703125,	 0.58544921875,
	 1.2412109375,	-0.08935546875,	-4.32568359375,	-3.89453125,	 1.5771484375,
	-1.40234375,	-0.98193359375,	-4.74267578125,	-4.09423828125,	 6.33935546875,
	 1.5068359375,	 1.044921875,	-1.796875,	-4.70849609375,	-1.4140625,
	-3.71533203125,	 3.18115234375,	-1.11474609375,	-1.2314453125,	 3.091796875,
	-1.62744140625,	-2.744140625,	-4.4580078125,	-5.43505859375,	 2.70654296875,
	-0.19873046875,	-3.28173828125,	-8.5283203125,	-1.41064453125,	 5.6484375,
	 1.802734375,	 3.318359375,	-0.1279296875,	-5.2958984375,	-0.90625,
	 3.55224609375,	 6.544921875,	-1.45947265625,	-5.17333984375,	 2.41015625,
	 0.119140625,	-1.08349609375,	 1.296875,	 1.84375,	-2.642578125,
	-1.97412109375,	-2.8974609375,	 1.04052734375,	 0.42138671875,	-1.3994140625,
	-1.6123046875,	 0.85107421875,	-0.9794921875,	-0.0625,	-1.001953125,
	-3.10595703125,	 1.6318359375,	-0.77294921875,	-0.01025390625,	 0.5576171875,
	-1.87353515625,	-0.89404296875,	 3.12353515625,	 1.24267578125,	-1.390625,
	-4.556640625,	-3.1875,	 2.59228515625,	 0.9697265625,	-1.09619140625,
	-2.1923828125,	 0.365234375,	 0.94482421875,	-1.47802734375,	-0.24072265625,
	-4.51904296875,	 2.6201171875,	 1.55908203125,	-2.19384765625,	 0.87109375,
	 2.3359375,	-0.1806640625,	 0.9111328125,	 0.51611328125,	-0.92236328125,
	 3.5849609375,	-1.3134765625,	-1.25830078125,	 0.330078125,	-0.29833984375,
	-0.2451171875,	 1.09130859375,	-0.9033203125,	-0.86767578125,	-1.00048828125,
	 0.49365234375,	 1.89453125,	-1.20361328125,	 1.07861328125,	-0.07421875,
	 1.265625,	 1.38134765625,	 2.728515625,	 1.38623046875,	-3.5673828125,
	-1.48876953125,	-2.4013671875,	 2.90771484375,	 4.49267578125,	-2.17138671875,
	 0.34033203125,	 1.908203125,	 2.8310546875,	-2.17333984375,	-2.267578125,
	-1.03564453125,	 2.658203125,	-1.2548828125,	 0.15673828125,	-0.5869140625,
	 1.3896484375,	-1.0185546875,	 1.724609375,	 0.2763671875,	-0.345703125,
	-2.08935546875,	 0.4638671875,	 2.431640625,	 1.83056640625,	 0.220703125,
	-1.212890625,	 1.7099609375,	 0.83935546875,	-0.0830078125,	 0.1162109375,
	-1.67724609375,	 0.12841796875,	 1.0322265625,	-0.97900390625,	 1.15283203125,
	-3.5830078125,	-0.58984375,	 4.56396484375,	-0.59375,	-1.95947265625,
	-6.5908203125,	-0.21435546875,	 3.919921875,	-2.06640625,	 0.17626953125,
	-1.82080078125,	 2.65283203125,	 0.978515625,	-2.30810546875,	-0.61474609375,
	-1.9462890625,	 3.78076171875,	 4.11572265625,	-1.80224609375,	-0.48193359375,
	 2.5380859375,	-0.20654296875,	 0.5615234375,	-0.62548828125,	 0.3984375,
	 3.61767578125,	 2.00634765625,	-1.92822265625,	 1.3134765625,	 0.0146484384313,
	 0.6083984375,	 1.49169921875,	-0.01708984375,	-0.6689453125,	-0.1201171875,
	-0.72705078125,	 2.75146484375,	-0.3310546875,	-1.28271484375,	 1.5478515625,
	 2.3583984375,	-2.23876953125,	 0.98046875,	-0.5185546875,	 0.39013671875,
	-0.06298828125,	 0.35009765625,	 2.2431640625,	 7.29345703125,	 5.2275390625,
	 0.20361328125,	 1.34716796875,	 0.9033203125,	-2.46923828125,	-0.56298828125,
	-1.89794921875,	 3.59423828125,	-2.81640625,	 2.09228515625,	 0.3251953125,
	 0.70458984375,	-0.4580078125,	 0.009765625,	-1.03466796875,	-0.82861328125,
	-1.8125,	-1.6611328125,	-1.080078125,	 0.0537109375,	 1.04296875,
	-1.44140625,	 0.005859375,	-0.765625,	-1.708984375,	-0.90576171875,
	-0.64208984375,	-0.84521484375,	 0.56640625,	-0.2724609375,	 0.83447265625,
	 0.04296875,	-2.23095703125,	 0.0947265625,	-0.2216796875,	-1.44384765625,
	-1.38623046875,	-0.8134765625,	-0.13330078125,	 1.017578125,	-0.07568359375,
	-0.09228515625,	-1.16015625,	 0.81201171875,	-0.5078125,	-1.19580078125,
	-1.3876953125,	-0.66845703125,	 0.310546875,	-0.12109375,	-1.30712890625,
	 0.74072265625,	 0.03857421875,	-1.47119140625,	-1.79150390625,	-0.47509765625,
	 0.93408203125,	-1.21728515625,	-2.59375,	-0.36572265625,	 0.62060546875,
	-1.41748046875,	-1.623046875,	-1.833984375,	-1.8017578125,	-0.89306640625,
	-1.42236328125,	-0.75537109375,	-1.34765625,	-0.6865234375,	 0.548828125,
	 0.900390625,	-0.8955078125,	 0.22265625,	 0.3447265625,	-2.0859375,
	 0.22802734375,	-2.078125,	-0.93212890625,	 0.74267578125,	 0.5537109375,
	-0.06201171875,	-0.4853515625,	-0.31103515625,	-0.72802734375,	-3.1708984375,
	 0.42626953125,	-0.99853515625,	-1.869140625,	-1.36328125,	-0.2822265625,
	 1.12841796875,	-0.88720703125,	 1.28515625,	-1.490234375,	 0.9609375,
	 0.31298828125,	 0.5830078125,	 0.92431640625,	 2.00537109375,	 3.0966796875,
	-0.02197265625,	 0.5849609375,	 1.0546875,	-0.70751953125,	 1.07568359375,
	-0.978515625,	 0.83642578125,	 1.7177734375,	 1.294921875,	 2.07568359375,
	 1.43359375,	-1.9375,	 0.625,		 0.06396484375,	-0.720703125,
	 1.38037109375,	 0.00390625,	-0.94140625,	 1.2978515625,	 1.71533203125,
	 1.56201171875,	-0.3984375,	 1.31201171875,	-0.85009765625,	-0.68701171875,
	 1.439453125,	 1.96728515625,	 0.1923828125,	-0.12353515625,	 0.6337890625,
	 2.0927734375,	 0.02490234375,	-2.20068359375,	-0.015625,	-0.32177734375,
	 1.90576171875,	 2.7568359375,	-2.728515625,	-1.265625,	 2.78662109375,
	-0.2958984375,	 0.6025390625,	-0.78466796875,	-2.53271484375,	 0.32421875,
	-0.25634765625,	 1.767578125,	-1.0703125,	-1.23388671875,	 0.83349609375,
	 2.09814453125,	-1.58740234375,	-1.11474609375,	 0.396484375,	-1.10546875,
	 2.81494140625,	 0.2578125,	-1.60498046875,	 0.66015625,	 0.81640625,
	 1.33544921875,	 0.60595703125,	-0.53857421875,	-1.59814453125,	-1.66357421875,
	 1.96923828125,	 0.8046875,	-1.44775390625,	-0.5732421875,	 0.705078125,
	 0.0361328125,	 0.4482421875,	 0.97607421875,	 0.44677734375,	-0.5009765625,
	-1.21875,	-0.78369140625,	 0.9931640625,	 1.4404296875,	 0.11181640625,
	-1.05859375,	 0.99462890625,	 0.00732421921566,-0.6171875,	-0.1015625,
	-1.734375,	 0.7470703125,	 0.28369140625,	 0.72802734375,	 0.4697265625,
	-1.27587890625,	-1.1416015625,	 1.76806640625,	-0.7265625,	-1.06689453125,
	-0.85302734375,	 0.03955078125,	 2.7041015625,	 0.69921875,	-1.10205078125,
	-0.49755859375,	 0.42333984375,	 0.1044921875,	-1.115234375,	-0.7373046875,
	-0.822265625,	 1.375,		-0.11181640625,	 1.24560546875,	-0.67822265625,
	 1.32177734375,	 0.24609375,	 0.23388671875,	 1.35888671875,	-0.49267578125,
	 1.22900390625,	-0.72607421875,	-0.779296875,	 0.30322265625,	 0.94189453125,
	-0.072265625,	 1.0771484375,	-2.09375,	 0.630859375,	-0.68408203125,
	-0.25732421875,	 0.60693359375,	-1.33349609375,	 0.93212890625,	 0.625,
	 1.04931640625,	-0.73291015625,	 1.80078125,	 0.2978515625,	-2.24169921875,
	 1.6142578125,	-1.64501953125,	 0.91552734375,	 1.775390625,	-0.59423828125,
	 1.2568359375,	 1.22705078125,	 0.70751953125,	-1.5009765625,	-2.43115234375,
	 0.3974609375,	 0.8916015625,	-1.21923828125,	 2.0673828125,	-1.99072265625,
	 0.8125,	-0.107421875,	 1.6689453125,	 0.4892578125,	 0.54443359375,
	 0.38134765625,	 0.8095703125,	 1.91357421875,	 2.9931640625,	 1.533203125,
	 0.560546875,	 1.98486328125,	 0.740234375,	 0.39794921875,	 0.09716796875,
	 0.58154296875,	 1.21533203125,	 1.25048828125,	 1.18212890625,	 1.19287109375,
	 0.3759765625,	-2.88818359375,	 2.69287109375,	-0.1796875,	-1.56201171875,
	 0.5810546875,	 0.51123046875,	 1.8271484375,	 3.38232421875,	-1.02001953125,
	 0.142578125,	 1.51318359375,	 2.103515625,	-0.3701171875,	-1.19873046875,
	 0.25537109375,	 1.91455078125,	 1.974609375,	 0.6767578125,	 0.04150390625,
	 2.13232421875,	 0.4912109375,	-0.611328125,	-0.7158203125,	-0.67529296875,
	 1.880859375,	 0.77099609375,	-0.03759765625,	 1.0078125,	 0.423828125,
	 2.49462890625,	 1.42529296875,	-0.0986328125,	 0.17529296875,	-0.24853515625,
	 1.7822265625,	 1.5654296875,	 1.12451171875,	 0.82666015625,	 0.6328125,
	 1.41845703125,	-1.90771484375,	 0.11181640625,	-0.583984375,	-1.138671875,
	 2.91845703125,	-1.75048828125,	 0.39306640625,	 1.86767578125,	-1.5322265625,
	 1.8291015625,	-0.2958984375,	 0.02587890625,	-0.13134765625,	-1.61181640625,
	 0.2958984375,	 0.9853515625,	-0.642578125,	 1.984375,	 0.1943359375
};

const float table1[111]={
	0.576690972,	0.580838025,	0.585013986,	0.589219987,	0.59345597,	0.597723007,
	0.602020264,	0.606384277,	0.610748291,	0.615142822,	0.619598389,	0.624084473,
	0.628570557,	0.633117676,	0.637695313,	0.642272949,	0.646911621,	0.651580811,
	0.656280518,	0.66104126,	0.665802002,	0.670593262,	0.675445557,	0.680328369,
	0.685241699,	0.690185547,	0.695159912,	0.700164795,	0.705230713,	0.710327148,
	0.715454102,	0.720611572,	0.725830078,	0.731048584,	0.736328125,	0.741638184,
	0.747009277,	0.752380371,	0.7578125,	0.763305664,	0.768798828,	0.774353027,
	0.779937744,	0.785583496,	0.791229248,	0.796936035,	0.802703857,	0.808502197,
	0.814331055,	0.820220947,	0.826141357,	0.832092285,	0.838104248,	0.844146729,
	0.850250244,	0.856384277,	0.862548828,	0.868774414,	0.875061035,	0.881378174,
	0.88772583,	0.894134521,	0.900604248,	0.907104492,	0.913635254,	0.920227051,
	0.926879883,	0.933563232,	0.940307617,	0.94708252,	0.953918457,	0.96081543,
	0.96774292,	0.974731445,	0.981781006,	0.988861084,	0.994842529,	0.998565674,
	0.999969482,	0.99911499,	0.996002197,	0.990600586,	0.982910156,	0.973022461,
	0.960876465,	0.946533203,	0.930053711,	0.911437988,	0.89074707,	0.868041992,
	0.843322754,	0.816680908,	0.788208008,	0.757904053,	0.725891113,	0.692199707,
	0.656921387,	0.620178223,	0.582000732,	0.542480469,	0.501739502,	0.459838867,
	0.416900635,	0.373016357,	0.328277588,	0.282775879,	0.236663818,	0.189971924,
	0.142852783,	0.0954284668,	0.0477600098
};

const float table2[38]={
	0.505699992,	0.524200022,	0.54339999,	0.563300014,	0.583953857,	0.60534668,
	0.627502441,	0.650482178,	0.674316406,	0.699005127,	0.724578857,	0.75112915,
	0.778625488,	0.807128906,	0.836669922,	0.86730957,	0.899078369,	0.932006836,
	0.961486816,	0.982757568,	0.995635986,	1,		0.995819092,	0.983154297,
	0.96206665,	0.932769775,	0.895507813,	0.850585938,	0.798400879,	0.739379883,
	0.674072266,	0.602996826,	0.526763916,	0.446014404,	0.361480713,	0.273834229,
	0.183868408,	0.0923461914
};

const float table1a[36]={
	0.98828125,	0.976699829,	0.965254128,	0.953942537,	0.942763507,	0.931715488,
	0.920796931,	0.910006344,	0.899342179,	0.888803005,	0.878387332,	0.868093729,
	0.857920766,	0.847867012,	0.837931097,	0.828111589,	0.818407178,	0.808816493,
	0.799338162,	0.789970934,	0.780713439,	0.771564424,	0.762522638,	0.753586829,
	0.744755745,	0.736028135,	0.727402806,	0.718878567,	0.710454226,	0.702128589,
	0.693900526,	0.685768902,	0.677732527,	0.669790328,	0.66194123,	0.654184103
};

const float table2a[10]={
	0.90625,	0.821289063,	0.74432373,	0.674499512,	0.61126709,
	0.553955078,	0.50201416,	0.454956055,	0.41229248,	0.373657227
};


static int ra288_decode_init(AVCodecContext * avctx)
{
	Real288_internal *glob=avctx->priv_data;
	memset(glob,0,sizeof(Real288_internal));
	return 0;
}

static void prodsum(float *tgt, float *src, int len, int n);
static void co(int n, int i, int j, float *in, float *out, float *st1, float *st2, const float *table);
static int pred(float *in, float *tgt, int n);
static void colmult(float *tgt, float *m1, const float *m2, int n);


/* initial decode */
static void unpack(unsigned short *tgt, unsigned char *src, int len)
{
  int x,y,z;
  int n,temp;
  int buffer[len];

  for (x=0;x<len;tgt[x++]=0)
    buffer[x]=9+(x&1);

  for (x=y=z=0;x<len/*was 38*/;x++) {
    n=buffer[y]-z;
    temp=src[x];
    if (n<8) temp&=255>>(8-n);
    tgt[y]+=temp<<z;
    if (n<=8) {
      tgt[++y]+=src[x]>>n;
      z=8-n;
    } else z+=8;
  }
}

static void update(Real288_internal *glob)
{
  int x,y;
  float buffer1[40],temp1[37];
  float buffer2[8],temp2[11];

  for (x=0,y=glob->phasep+5;x<40;buffer1[x++]=glob->output[(y++)%40]);
  co(36,40,35,buffer1,temp1,glob->st1a,glob->st1b,table1);
  if (pred(temp1,glob->st1,36))
    colmult(glob->pr1,glob->st1,table1a,36);

  for (x=0,y=glob->phase+1;x<8;buffer2[x++]=glob->history[(y++)%8]);
  co(10,8,20,buffer2,temp2,glob->st2a,glob->st2b,table2);
  if (pred(temp2,glob->st2,10))
    colmult(glob->pr2,glob->st2,table2a,10);
}

/* Decode and produce output */
static void decode(Real288_internal *glob, unsigned int input)
{
  unsigned int x,y;
  float f;
  double sum,sumsum;
  float *p1,*p2;
  float buffer[5];
  const float *table;

  for (x=36;x--;glob->sb[x+5]=glob->sb[x]);
  for (x=5;x--;) {
    p1=glob->sb+x;p2=glob->pr1;
    for (sum=0,y=36;y--;sum-=(*(++p1))*(*(p2++)));
    glob->sb[x]=sum;
  }

  f=amptable[input&7];
  table=codetable+(input>>3)*5;

  /* convert log and do rms */
  for (sum=32,x=10;x--;sum-=glob->pr2[x]*glob->lhist[x]);
  if (sum<0) sum=0; else if (sum>60) sum=60;

  sumsum=exp(sum*0.1151292546497)*f;	/* pow(10.0,sum/20)*f */
  for (sum=0,x=5;x--;) { buffer[x]=table[x]*sumsum; sum+=buffer[x]*buffer[x]; }
  if ((sum/=5)<1) sum=1;

  /* shift and store */
  for (x=10;--x;glob->lhist[x]=glob->lhist[x-1]);
  *glob->lhist=glob->history[glob->phase]=10*log10(sum)-32;

  for (x=1;x<5;x++) for (y=x;y--;buffer[x]-=glob->pr1[x-y-1]*buffer[y]);

  /* output */
  for (x=0;x<5;x++) {
    f=glob->sb[4-x]+buffer[x];
    if (f>4095) f=4095; else if (f<-4095) f=-4095;
    glob->output[glob->phasep+x]=glob->sb[4-x]=f;
  }
}

/* column multiply */
static void colmult(float *tgt, float *m1, const float *m2, int n)
{
  while (n--)
    *(tgt++)=(*(m1++))*(*(m2++));
}

static int pred(float *in, float *tgt, int n)
{
  int x,y;
  float *p1,*p2;
  double f0,f1,f2;
  float temp;

  if (in[n]==0) return 0;
  if ((f0=*in)<=0) return 0;

  for (x=1;;x++) {
    if (n<x) return 1;

    p1=in+x;
    p2=tgt;
    f1=*(p1--);
    for (y=x;--y;f1+=(*(p1--))*(*(p2++)));

    p1=tgt+x-1;
    p2=tgt;
    *(p1--)=f2=-f1/f0;
    for (y=x>>1;y--;) {
      temp=*p2+*p1*f2;
      *(p1--)+=*p2*f2;
      *(p2++)=temp;
    }
    if ((f0+=f1*f2)<0) return 0;
  }
}

static void co(int n, int i, int j, float *in, float *out, float *st1, float *st2, const float *table)
{
  int a,b,c;
  unsigned int x;
  float *fp,*fp2;
  float buffer1[37];
  float buffer2[37];
  float work[111];

  /* rotate and multiply */
  c=(b=(a=n+i)+j)-i;
  fp=st1+i;
  for (x=0;x<b;x++) {
    if (x==c) fp=in;
    work[x]=*(table++)*(*(st1++)=*(fp++));
  }
  
  prodsum(buffer1,work+n,i,n);
  prodsum(buffer2,work+a,j,n);

  for (x=0;x<=n;x++) {
    *st2=*st2*(0.5625)+buffer1[x];
    out[x]=*(st2++)+buffer2[x];
  }
  *out*=1.00390625; /* to prevent clipping */
}

/* product sum (lsf) */
static void prodsum(float *tgt, float *src, int len, int n)
{
  unsigned int x;
  float *p1,*p2;
  double sum;

  while (n>=0)
  {
    p1=(p2=src)-n;
    for (sum=0,x=len;x--;sum+=(*p1++)*(*p2++));
    tgt[n--]=sum;
  }
}

void * decode_block(AVCodecContext * avctx, unsigned char *in, signed short int *out,unsigned len)
{
  int x,y;
  Real288_internal *glob=avctx->priv_data;
  unsigned short int buffer[len];

  unpack(buffer,in,len);
  for (x=0;x<32;x++)
  {
    glob->phasep=(glob->phase=x&7)*5;
    decode(glob,buffer[x]);
    for (y=0;y<5;*(out++)=8*glob->output[glob->phasep+(y++)]);
    if (glob->phase==3) update(glob);
  }
  return out;
}

/* Decode a block (celp) */
static int ra288_decode_frame(AVCodecContext * avctx,
            void *data, int *data_size,
            uint8_t * buf, int buf_size)
{
  if(avctx->extradata_size>=6)
  {
//((short*)(avctx->extradata))[0]; /* subpacket size */
//((short*)(avctx->extradata))[1]; /* subpacket height */
//((short*)(avctx->extradata))[2]; /* subpacket flavour */
//((short*)(avctx->extradata))[3]; /* coded frame size */
//((short*)(avctx->extradata))[4]; /* codec's data length  */
//((short*)(avctx->extradata))[5...] /* codec's data */
    int bret;
    void *datao;
    int w=avctx->block_align; /* 228 */
    int h=((short*)(avctx->extradata))[1]; /* 12 */
    int cfs=((short*)(avctx->extradata))[3]; /* coded frame size 38 */
    int i,j;
    if(buf_size<w*h)
    {
	fprintf(stderr,"ffra288: Error! Input buffer is too small [%d<%d]\n",buf_size,w*h);
	return 0;
    }
    datao = data;
    bret = 0;
    for (j = 0; j < h/2; j++)
	for (i = 0; i < h; i++)
    {
	    data=decode_block(avctx,&buf[j*cfs+cfs*i*h/2],(signed short *)data,cfs);
	    bret += cfs;
    }
    *data_size = data - datao;
    return bret;
  }
  else
  {
    fprintf(stderr,"ffra288: Error: need extra data!!!\n");
    return 0;
  }
}

AVCodec ra_288_decoder =
{
    "real_288",
    CODEC_TYPE_AUDIO,
    CODEC_ID_RA_288,
    sizeof(Real288_internal),
    ra288_decode_init,
    NULL,
    NULL,
    ra288_decode_frame,
};