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FFmpeg/libavcodec/ra288.c
Nick Kurshev 0b15bfe7cc some useful warning 
Originally committed as revision 1961 to svn://svn.ffmpeg.org/ffmpeg/trunk
2003-06-16 08:28:43 +00:00

465 lines
19 KiB
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/*
* 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[38];
for (x=0;x<len;tgt[x++]=0)
buffer[x]=9+(x&1);
for (x=y=z=0;x<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;
}
}
#ifndef max
#define max(a,b) ((a)>(b)?(a):(b))
#endif
/* Decode a block (celp) */
static int ra288_decode_frame(AVCodecContext * avctx,
void *data, int *data_size,
uint8_t * buf, int buf_size)
{
int x,y,z,bret;
unsigned short int buffer[buf_size];
unsigned char b[buf_size],*bp;
void *datao;
Real288_internal *glob=avctx->priv_data;
if(avctx->extradata_size>=6)
{
int w=avctx->block_align;
int h=((short*)(avctx->extradata))[1];
int cfs=((short*)(avctx->extradata))[3]; /* coded frame size */
int i,j;
if(buf_size<w*h)
{
fprintf(stderr,"ffra288: warning! Context was not interleaved [%d<%d]\n",buf_size,w*h);
goto no_interleave;
}
bp = buf;
for (j = 0; j < h; j++)
for (i = 0; i < h/2; i++)
{
memcpy(&b[i*2*w+j*cfs], bp, cfs);
bp += cfs;
if(bp-buf>buf_size)
{
fprintf(stderr,"ffra288: warning! Context was partly interleaved [%d<%d]\n",buf_size,w*h);
break;
}
}
bret=bp-buf;
bp = b;
}
else
{
fprintf(stderr,"ffra288: warning! Context was not interleaved [%d<%d]\n",avctx->extradata_size,6);
no_interleave:
bret=buf_size;
bp = buf;
}
datao = data;
z=0;
while(z<bret)
{
unpack(buffer,&bp[z],32);
for (x=0;x<32;x++)
{
glob->phasep=(glob->phase=x&7)*5;
decode(glob,buffer[x]);
for (y=0;y<5;*(((int16_t *)data)++)=8*glob->output[glob->phasep+(y++)]);
if (glob->phase==3) update(glob);
}
z+=32;
}
*data_size = data - datao;
return bret;
}
AVCodec ra_288_decoder =
{
"real_288",
CODEC_TYPE_AUDIO,
CODEC_ID_RA_288,
sizeof(Real288_internal),
ra288_decode_init,
NULL,
NULL,
ra288_decode_frame,
};
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