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515 lines
12 KiB
515 lines
12 KiB
/* |
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* Real Audio 1.0 (14.4K) |
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* Copyright (c) 2003 the ffmpeg project |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "avcodec.h" |
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#include "ra144.h" |
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#define DATABLOCK1 20 /* size of 14.4 input block in bytes */ |
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#define DATACHUNK1 1440 /* size of 14.4 input chunk in bytes */ |
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#define AUDIOBLOCK 160 /* size of output block in 16-bit words (320 bytes) */ |
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#define AUDIOBUFFER 12288 /* size of output buffer in 16-bit words (24576 bytes) */ |
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/* consts */ |
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#define NBLOCKS 4 /* number of segments within a block */ |
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#define BLOCKSIZE 40 /* (quarter) block size in 16-bit words (80 bytes) */ |
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#define HALFBLOCK 20 /* BLOCKSIZE/2 */ |
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#define BUFFERSIZE 146 /* for do_output */ |
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/* internal globals */ |
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typedef struct { |
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unsigned int resetflag, val, oldval; |
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unsigned int unpacked[28]; /* buffer for unpacked input */ |
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unsigned int *iptr; /* pointer to current input (from unpacked) */ |
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unsigned int gval; |
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unsigned short *gsp; |
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unsigned int gbuf1[8]; |
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unsigned short gbuf2[120]; |
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signed short output_buffer[40]; |
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unsigned int *decptr; /* decoder ptr */ |
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signed short *decsp; |
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/* the swapped buffers */ |
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unsigned int swapb1a[10]; |
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unsigned int swapb2a[10]; |
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unsigned int swapb1b[10]; |
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unsigned int swapb2b[10]; |
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unsigned int *swapbuf1; |
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unsigned int *swapbuf2; |
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unsigned int *swapbuf1alt; |
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unsigned int *swapbuf2alt; |
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unsigned int buffer[5]; |
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unsigned short int buffer_2[148]; |
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unsigned short int buffer_a[40]; |
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unsigned short int buffer_b[40]; |
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unsigned short int buffer_c[40]; |
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unsigned short int buffer_d[40]; |
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unsigned short int work[50]; |
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unsigned short *sptr; |
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int buffer1[10]; |
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int buffer2[10]; |
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signed short wavtable1[2304]; |
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unsigned short wavtable2[2304]; |
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} Real144_internal; |
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static int ra144_decode_init(AVCodecContext * avctx) |
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{ |
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Real144_internal *glob=avctx->priv_data; |
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memset(glob,0,sizeof(Real144_internal)); |
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glob->resetflag=1; |
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glob->swapbuf1=glob->swapb1a; |
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glob->swapbuf2=glob->swapb2a; |
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glob->swapbuf1alt=glob->swapb1b; |
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glob->swapbuf2alt=glob->swapb2b; |
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memcpy(glob->wavtable1,wavtable1,sizeof(wavtable1)); |
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memcpy(glob->wavtable2,wavtable2,sizeof(wavtable2)); |
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return 0; |
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} |
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static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len); |
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static void add_wav(Real144_internal *glob, int n, int f, int m1, int m2, int m3, short *s1, short *s2, short *s3, short *dest); |
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static int irms(short *data, int factor); |
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static void rotate_block(short *source, short *target, int offset); |
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/* lookup square roots in table */ |
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static int t_sqrt(unsigned int x) |
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{ |
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int s=0; |
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while (x>0xfff) { s++; x=x>>2; } |
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return (sqrt_table[x]<<s)<<2; |
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} |
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/* do 'voice' */ |
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static void do_voice(int *a1, int *a2) |
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{ |
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int buffer[10]; |
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int *b1,*b2; |
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int x,y; |
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int *ptr,*tmp; |
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b1=buffer; |
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b2=a2; |
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for (x=0;x<10;x++) { |
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b1[x]=(*a1)<<4; |
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if(x>0) { |
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ptr=b2+x; |
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for (y=0;y<=x-1;y++) |
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b1[y]=(((*a1)*(*(--ptr)))>>12)+b2[y]; |
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} |
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tmp=b1; |
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b1=b2; |
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b2=tmp; |
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a1++; |
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} |
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ptr=a2+10; |
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while (ptr>a2) (*a2++)>>=4; |
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} |
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/* do quarter-block output */ |
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static void do_output_subblock(Real144_internal *glob, int x) |
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{ |
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int a,b,c,d,e,f,g; |
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if (x==1) memset(glob->buffer,0,20); |
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if ((*glob->iptr)==0) a=0; |
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else a=(*glob->iptr)+HALFBLOCK-1; |
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glob->iptr++; |
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b=*(glob->iptr++); |
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c=*(glob->iptr++); |
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d=*(glob->iptr++); |
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if (a) rotate_block(glob->buffer_2,glob->buffer_a,a); |
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memcpy(glob->buffer_b,etable1+b*BLOCKSIZE,BLOCKSIZE*2); |
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e=((ftable1[b]>>4)*glob->gval)>>8; |
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memcpy(glob->buffer_c,etable2+c*BLOCKSIZE,BLOCKSIZE*2); |
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f=((ftable2[c]>>4)*glob->gval)>>8; |
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if (a) g=irms(glob->buffer_a,glob->gval)>>12; |
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else g=0; |
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add_wav(glob,d,a,g,e,f,glob->buffer_a,glob->buffer_b,glob->buffer_c,glob->buffer_d); |
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memmove(glob->buffer_2,glob->buffer_2+BLOCKSIZE,(BUFFERSIZE-BLOCKSIZE)*2); |
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memcpy(glob->buffer_2+BUFFERSIZE-BLOCKSIZE,glob->buffer_d,BLOCKSIZE*2); |
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final(glob,glob->gsp,glob->buffer_d,glob->output_buffer,glob->buffer,BLOCKSIZE); |
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} |
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/* rotate block */ |
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static void rotate_block(short *source, short *target, int offset) |
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{ |
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short *end; |
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short *ptr1; |
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short *ptr2; |
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short *ptr3; |
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ptr2=source+BUFFERSIZE; |
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ptr3=ptr1=ptr2-offset; |
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end=target+BLOCKSIZE; |
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while (target<end) { |
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*(target++)=*(ptr3++); |
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if (ptr3==ptr2) ptr3=ptr1; |
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} |
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} |
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/* inverse root mean square */ |
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static int irms(short *data, int factor) |
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{ |
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short *p1,*p2; |
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unsigned int sum; |
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p2=(p1=data)+BLOCKSIZE; |
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for (sum=0;p2>p1;p1++) sum+=(*p1)*(*p1); |
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if (sum==0) return 0; /* OOPS - division by zero */ |
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return (0x20000000/(t_sqrt(sum)>>8))*factor; |
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} |
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/* multiply/add wavetable */ |
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static void add_wav(Real144_internal *glob, int n, int f, int m1, int m2, int m3, short *s1, short *s2, short *s3, short *dest) |
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{ |
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int a,b,c; |
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int x; |
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short *ptr,*ptr2; |
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ptr=glob->wavtable1+n*9; |
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ptr2=glob->wavtable2+n*9; |
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if (f!=0) { |
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a=((*ptr)*m1)>>((*ptr2)+1); |
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} else { |
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a=0; |
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} |
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ptr++;ptr2++; |
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b=((*ptr)*m2)>>((*ptr2)+1); |
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ptr++;ptr2++; |
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c=((*ptr)*m3)>>((*ptr2)+1); |
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ptr2=(ptr=dest)+BLOCKSIZE; |
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if (f!=0) |
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while (ptr<ptr2) |
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*(ptr++)=((*(s1++))*a+(*(s2++))*b+(*(s3++))*c)>>12; |
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else |
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while (ptr<ptr2) |
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*(ptr++)=((*(s2++))*b+(*(s3++))*c)>>12; |
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} |
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static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len) |
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{ |
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int x,sum; |
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int buffer[10]; |
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short *ptr; |
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short *ptr2; |
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memcpy(glob->work,statbuf,20); |
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memcpy(glob->work+10,i2,len*2); |
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buffer[9]=i1[0]; |
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buffer[8]=i1[1]; |
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buffer[7]=i1[2]; |
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buffer[6]=i1[3]; |
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buffer[5]=i1[4]; |
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buffer[4]=i1[5]; |
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buffer[3]=i1[6]; |
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buffer[2]=i1[7]; |
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buffer[1]=i1[8]; |
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buffer[0]=i1[9]; |
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ptr2=(ptr=glob->work)+len; |
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while (ptr<ptr2) { |
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for(sum=0,x=0;x<=9;x++) |
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sum+=buffer[x]*(ptr[x]); |
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sum=sum>>12; |
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x=ptr[10]-sum; |
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if (x<-32768 || x>32767) |
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{ |
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memset(out,0,len*2); |
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memset(statbuf,0,20); |
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return; |
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} |
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ptr[10]=x; |
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ptr++; |
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} |
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memcpy(out,ptr+10-len,len*2); |
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memcpy(statbuf,ptr,20); |
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} |
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/* Decode 20-byte input */ |
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static void unpack_input(unsigned char *input, unsigned int *output) |
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{ |
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unsigned int outbuffer[28]; |
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unsigned short inbuffer[10]; |
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unsigned int x; |
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unsigned int *ptr; |
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/* fix endianness */ |
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for (x=0;x<20;x+=2) |
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inbuffer[x/2]=(input[x]<<8)+input[x+1]; |
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/* unpack */ |
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ptr=outbuffer; |
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*(ptr++)=27; |
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*(ptr++)=(inbuffer[0]>>10)&0x3f; |
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*(ptr++)=(inbuffer[0]>>5)&0x1f; |
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*(ptr++)=inbuffer[0]&0x1f; |
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*(ptr++)=(inbuffer[1]>>12)&0xf; |
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*(ptr++)=(inbuffer[1]>>8)&0xf; |
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*(ptr++)=(inbuffer[1]>>5)&7; |
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*(ptr++)=(inbuffer[1]>>2)&7; |
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*(ptr++)=((inbuffer[1]<<1)&6)|((inbuffer[2]>>15)&1); |
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*(ptr++)=(inbuffer[2]>>12)&7; |
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*(ptr++)=(inbuffer[2]>>10)&3; |
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*(ptr++)=(inbuffer[2]>>5)&0x1f; |
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*(ptr++)=((inbuffer[2]<<2)&0x7c)|((inbuffer[3]>>14)&3); |
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*(ptr++)=(inbuffer[3]>>6)&0xff; |
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*(ptr++)=((inbuffer[3]<<1)&0x7e)|((inbuffer[4]>>15)&1); |
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*(ptr++)=(inbuffer[4]>>8)&0x7f; |
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*(ptr++)=(inbuffer[4]>>1)&0x7f; |
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*(ptr++)=((inbuffer[4]<<7)&0x80)|((inbuffer[5]>>9)&0x7f); |
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*(ptr++)=(inbuffer[5]>>2)&0x7f; |
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*(ptr++)=((inbuffer[5]<<5)&0x60)|((inbuffer[6]>>11)&0x1f); |
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*(ptr++)=(inbuffer[6]>>4)&0x7f; |
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*(ptr++)=((inbuffer[6]<<4)&0xf0)|((inbuffer[7]>>12)&0xf); |
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*(ptr++)=(inbuffer[7]>>5)&0x7f; |
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*(ptr++)=((inbuffer[7]<<2)&0x7c)|((inbuffer[8]>>14)&3); |
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*(ptr++)=(inbuffer[8]>>7)&0x7f; |
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*(ptr++)=((inbuffer[8]<<1)&0xfe)|((inbuffer[9]>>15)&1); |
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*(ptr++)=(inbuffer[9]>>8)&0x7f; |
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*(ptr++)=(inbuffer[9]>>1)&0x7f; |
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*(output++)=outbuffer[11]; |
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for (x=1;x<11;*(output++)=outbuffer[x++]); |
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ptr=outbuffer+12; |
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for (x=0;x<16;x+=4) |
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{ |
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*(output++)=ptr[x]; |
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*(output++)=ptr[x+2]; |
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*(output++)=ptr[x+3]; |
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*(output++)=ptr[x+1]; |
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} |
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} |
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static unsigned int rms(int *data, int f) |
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{ |
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int *c; |
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int x; |
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int d; |
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unsigned int res; |
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int b; |
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c=data; |
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b=0; |
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res=0x10000; |
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for (x=0;x<10;x++) |
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{ |
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res=(((0x1000000-(*c)*(*c))>>12)*res)>>12; |
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if (res==0) return 0; |
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if (res<=0x3fff) |
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{ |
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while (res<=0x3fff) |
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{ |
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b++; |
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res<<=2; |
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} |
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} else { |
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if (res>0x10000) |
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return 0; /* We're screwed, might as well go out with a bang. :P */ |
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} |
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c++; |
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} |
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if (res>0) res=t_sqrt(res); |
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res>>=(b+10); |
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res=(res*f)>>10; |
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return res; |
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} |
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static void dec1(Real144_internal *glob, int *data, int *inp, int n, int f) |
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{ |
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short *ptr,*end; |
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*(glob->decptr++)=rms(data,f); |
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glob->decptr++; |
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end=(ptr=glob->decsp)+(n*10); |
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while (ptr<end) *(ptr++)=*(inp++); |
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} |
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static int eq(Real144_internal *glob, short *in, int *target) |
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{ |
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int retval; |
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int a; |
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int b; |
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int c; |
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unsigned int u; |
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short *sptr; |
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int *ptr1,*ptr2,*ptr3; |
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int *bp1,*bp2,*temp; |
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retval=0; |
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bp1=glob->buffer1; |
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bp2=glob->buffer2; |
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ptr2=(ptr3=glob->buffer2)+9; |
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sptr=in; |
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while (ptr2>=ptr3) |
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*(ptr3++)=*(sptr++); |
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target+=9; |
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a=bp2[9]; |
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*target=a; |
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if (a+0x1000>0x1fff) |
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return 0; /* We're screwed, might as well go out with a bang. :P */ |
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c=8;u=a; |
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while (c>=0) |
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{ |
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if (u==0x1000) u++; |
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if (u==0xfffff000) u--; |
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b=0x1000-((u*u)>>12); |
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if (b==0) b++; |
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ptr2=bp1; |
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ptr1=(ptr3=bp2)+c; |
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for (u=0;u<=c;u++) |
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*(ptr2++)=((*(ptr3++)-(((*target)*(*(ptr1--)))>>12))*(0x1000000/b))>>12; |
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*(--target)=u=bp1[(c--)]; |
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if ((u+0x1000)>0x1fff) retval=1; |
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temp=bp2; |
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bp2=bp1; |
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bp1=temp; |
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} |
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return retval; |
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} |
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static void dec2(Real144_internal *glob, int *data, int *inp, int n, int f, int *inp2, int l) |
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{ |
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unsigned int *ptr1,*ptr2; |
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int work[10]; |
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int a,b; |
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int x; |
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int result; |
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if(l+1<NBLOCKS/2) a=NBLOCKS-(l+1); |
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else a=l+1; |
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b=NBLOCKS-a; |
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if (l==0) |
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{ |
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glob->decsp=glob->sptr=glob->gbuf2; |
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glob->decptr=glob->gbuf1; |
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} |
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ptr1=inp; |
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ptr2=inp2; |
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for (x=0;x<10*n;x++) |
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*(glob->sptr++)=(a*(*ptr1++)+b*(*ptr2++))>>2; |
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result=eq(glob,glob->decsp,work); |
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if (result==1) |
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{ |
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dec1(glob,data,inp,n,f); |
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} else { |
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*(glob->decptr++)=rms(work,f); |
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glob->decptr++; |
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} |
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glob->decsp+=n*10; |
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} |
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/* Uncompress one block (20 bytes -> 160*2 bytes) */ |
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static int ra144_decode_frame(AVCodecContext * avctx, |
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void *data, int *data_size, |
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uint8_t * buf, int buf_size) |
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{ |
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unsigned int a,b,c; |
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long s; |
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signed short *shptr; |
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unsigned int *lptr,*temp; |
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const short **dptr; |
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void *datao; |
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Real144_internal *glob=avctx->priv_data; |
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datao = data; |
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unpack_input(buf,glob->unpacked); |
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glob->iptr=glob->unpacked; |
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glob->val=decodetable[0][(*(glob->iptr++))<<1]; |
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dptr=decodetable+1; |
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lptr=glob->swapbuf1; |
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while (lptr<glob->swapbuf1+10) |
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*(lptr++)=(*(dptr++))[(*(glob->iptr++))<<1]; |
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do_voice(glob->swapbuf1,glob->swapbuf2); |
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a=t_sqrt(glob->val*glob->oldval)>>12; |
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for (c=0;c<NBLOCKS;c++) { |
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if (c==(NBLOCKS-1)) { |
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dec1(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val); |
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} else { |
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if (c*2==(NBLOCKS-2)) { |
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if (glob->oldval<glob->val) { |
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dec2(glob,glob->swapbuf1,glob->swapbuf2,3,a,glob->swapbuf2alt,c); |
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} else { |
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dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,a,glob->swapbuf2,c); |
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} |
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} else { |
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if (c*2<(NBLOCKS-2)) { |
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dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,glob->oldval,glob->swapbuf2,c); |
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} else { |
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dec2(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val,glob->swapbuf2alt,c); |
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} |
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} |
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} |
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} |
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/* do output */ |
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for (b=0,c=0;c<4;c++) { |
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glob->gval=glob->gbuf1[c*2]; |
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glob->gsp=glob->gbuf2+b; |
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do_output_subblock(glob,glob->resetflag); |
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glob->resetflag=0; |
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shptr=glob->output_buffer; |
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while (shptr<glob->output_buffer+BLOCKSIZE) { |
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s=*(shptr++)<<2; |
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*((int16_t *)data)=s; |
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if (s>32767) *((int16_t *)data)=32767; |
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if (s<-32767) *((int16_t *)data)=-32768; |
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((int16_t *)data)++; |
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} |
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b+=30; |
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} |
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glob->oldval=glob->val; |
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temp=glob->swapbuf1alt; |
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glob->swapbuf1alt=glob->swapbuf1; |
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glob->swapbuf1=temp; |
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temp=glob->swapbuf2alt; |
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glob->swapbuf2alt=glob->swapbuf2; |
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glob->swapbuf2=temp; |
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*data_size=data-datao; |
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return 20; |
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} |
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AVCodec ra_144_decoder = |
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{ |
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"real_144", |
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CODEC_TYPE_AUDIO, |
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CODEC_ID_RA_144, |
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sizeof(Real144_internal), |
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ra144_decode_init, |
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NULL, |
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NULL, |
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ra144_decode_frame, |
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};
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