* Real Audio 1.0 (14.4K)
* Copyright (c) 2003 the ffmpeg project
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avcodec.h"
+#include "bitstream.h"
#include "ra144.h"
-#define DATABLOCK1 20 /* size of 14.4 input block in bytes */
-#define DATACHUNK1 1440 /* size of 14.4 input chunk in bytes */
-#define AUDIOBLOCK 160 /* size of output block in 16-bit words (320 bytes) */
-#define AUDIOBUFFER 12288 /* size of output buffer in 16-bit words (24576 bytes) */
-/* consts */
#define NBLOCKS 4 /* number of segments within a block */
#define BLOCKSIZE 40 /* (quarter) block size in 16-bit words (80 bytes) */
#define HALFBLOCK 20 /* BLOCKSIZE/2 */
/* internal globals */
typedef struct {
- unsigned int resetflag, val, oldval;
- unsigned int unpacked[28]; /* buffer for unpacked input */
- unsigned int *iptr; /* pointer to current input (from unpacked) */
- unsigned int gval;
- unsigned short *gsp;
- unsigned int gbuf1[8];
- unsigned short gbuf2[120];
- signed short output_buffer[40];
- unsigned int *decptr; /* decoder ptr */
- signed short *decsp;
-
- /* the swapped buffers */
- unsigned int swapb1a[10];
- unsigned int swapb2a[10];
- unsigned int swapb1b[10];
- unsigned int swapb2b[10];
- unsigned int *swapbuf1;
- unsigned int *swapbuf2;
- unsigned int *swapbuf1alt;
- unsigned int *swapbuf2alt;
-
- unsigned int buffer[5];
- unsigned short int buffer_2[148];
- unsigned short int buffer_a[40];
- unsigned short int buffer_b[40];
- unsigned short int buffer_c[40];
- unsigned short int buffer_d[40];
-
- unsigned short int work[50];
- unsigned short *sptr;
-
- int buffer1[10];
- int buffer2[10];
-
- signed short wavtable1[2304];
- unsigned short wavtable2[2304];
+ unsigned int oldval;
+ unsigned int gbuf1[8];
+ unsigned short gbuf2[120];
+ unsigned int *decptr; /* decoder ptr */
+ signed short *decsp;
+
+ /* the swapped buffers */
+ unsigned int swapbuffers[4][10];
+ unsigned int *swapbuf1;
+ unsigned int *swapbuf2;
+ unsigned int *swapbuf1alt;
+ unsigned int *swapbuf2alt;
+
+ unsigned int buffer[5];
+ unsigned short int buffer_2[148];
+
+ unsigned short *sptr;
} Real144_internal;
static int ra144_decode_init(AVCodecContext * avctx)
{
- Real144_internal *glob=avctx->priv_data;
-
- memset(glob,0,sizeof(Real144_internal));
- glob->resetflag=1;
- glob->swapbuf1=glob->swapb1a;
- glob->swapbuf2=glob->swapb2a;
- glob->swapbuf1alt=glob->swapb1b;
- glob->swapbuf2alt=glob->swapb2b;
+ Real144_internal *glob = avctx->priv_data;
- memcpy(glob->wavtable1,wavtable1,sizeof(wavtable1));
- memcpy(glob->wavtable2,wavtable2,sizeof(wavtable2));
+ glob->swapbuf1 = glob->swapbuffers[0];
+ glob->swapbuf2 = glob->swapbuffers[1];
+ glob->swapbuf1alt = glob->swapbuffers[2];
+ glob->swapbuf2alt = glob->swapbuffers[3];
- return 0;
+ return 0;
}
-static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len);
-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);
-static int irms(short *data, int factor);
-static void rotate_block(short *source, short *target, int offset);
+static void final(const short *i1, const short *i2, void *out, int *statbuf, int len);
+static void add_wav(int n, int f, int m1, int m2, int m3, const short *s1, const short *s2, const short *s3, short *dest);
+static int irms(const short *data, int factor);
+static void rotate_block(const short *source, short *target, int offset);
+
/* lookup square roots in table */
static int t_sqrt(unsigned int x)
{
- int s=0;
- while (x>0xfff) { s++; x=x>>2; }
- return (sqrt_table[x]<<s)<<2;
+ int s = 0;
+ while (x > 0xfff) {
+ s++;
+ x = x >> 2;
+ }
+
+ return (sqrt_table[x] << s) << 2;
}
/* do 'voice' */
-static void do_voice(int *a1, int *a2)
+static void do_voice(const int *a1, int *a2)
{
- int buffer[10];
- int *b1,*b2;
- int x,y;
- int *ptr,*tmp;
+ int buffer[10];
+ int *b1 = buffer;
+ int *b2 = a2;
+ int x, y;
- b1=buffer;
- b2=a2;
+ for (x=0; x < 10; x++) {
+ b1[x] = a1[x] << 4;
- for (x=0;x<10;x++) {
- b1[x]=(*a1)<<4;
+ for (y=0; y < x; y++)
+ b1[y] = ((a1[x] * b2[x-y-1]) >> 12) + b2[y];
- if(x>0) {
- ptr=b2+x;
- for (y=0;y<=x-1;y++)
- b1[y]=(((*a1)*(*(--ptr)))>>12)+b2[y];
+ FFSWAP(int *, b1, b2);
}
- tmp=b1;
- b1=b2;
- b2=tmp;
- a1++;
- }
- ptr=a2+10;
- while (ptr>a2) (*a2++)>>=4;
+
+ for (x=0; x < 10; x++)
+ a2[x] >>= 4;
}
/* do quarter-block output */
-static void do_output_subblock(Real144_internal *glob, unsigned int x)
+static void do_output_subblock(Real144_internal *glob, const unsigned short *gsp, unsigned int gval, signed short *output_buffer, GetBitContext *gb)
{
- int a,b,c,d,e,f,g;
-
- if (x==1) memset(glob->buffer,0,20);
- if ((*glob->iptr)==0) a=0;
- else a=(*glob->iptr)+HALFBLOCK-1;
- glob->iptr++;
- b=*(glob->iptr++);
- c=*(glob->iptr++);
- d=*(glob->iptr++);
- if (a) rotate_block(glob->buffer_2,glob->buffer_a,a);
- memcpy(glob->buffer_b,etable1+b*BLOCKSIZE,BLOCKSIZE*2);
- e=((ftable1[b]>>4)*glob->gval)>>8;
- memcpy(glob->buffer_c,etable2+c*BLOCKSIZE,BLOCKSIZE*2);
- f=((ftable2[c]>>4)*glob->gval)>>8;
- if (a) g=irms(glob->buffer_a,glob->gval)>>12;
- else g=0;
- add_wav(glob,d,a,g,e,f,glob->buffer_a,glob->buffer_b,glob->buffer_c,glob->buffer_d);
- memmove(glob->buffer_2,glob->buffer_2+BLOCKSIZE,(BUFFERSIZE-BLOCKSIZE)*2);
- memcpy(glob->buffer_2+BUFFERSIZE-BLOCKSIZE,glob->buffer_d,BLOCKSIZE*2);
- final(glob,glob->gsp,glob->buffer_d,glob->output_buffer,glob->buffer,BLOCKSIZE);
+ unsigned short int buffer_a[40];
+ unsigned short int buffer_d[40];
+ int e, f, g;
+ int a = get_bits(gb, 7);
+ int d = get_bits(gb, 8);
+ int b = get_bits(gb, 7);
+ int c = get_bits(gb, 7);
+
+ if (a) {
+ a += HALFBLOCK - 1;
+ rotate_block(glob->buffer_2, buffer_a, a);
+ }
+
+ e = ((ftable1[b] >> 4) * gval) >> 8;
+ f=((ftable2[c] >> 4) * gval) >> 8;
+
+ if (a)
+ g = irms(buffer_a, gval) >> 12;
+ else
+ g = 0;
+
+ add_wav(d, a, g, e, f, buffer_a, etable1 + b*BLOCKSIZE,
+ etable2 + c*BLOCKSIZE, buffer_d);
+
+ memmove(glob->buffer_2, glob->buffer_2 + BLOCKSIZE, (BUFFERSIZE - BLOCKSIZE) * 2);
+ memcpy(glob->buffer_2 + BUFFERSIZE - BLOCKSIZE, buffer_d, BLOCKSIZE * 2);
+
+ final(gsp, buffer_d, output_buffer, glob->buffer, BLOCKSIZE);
}
/* rotate block */
-static void rotate_block(short *source, short *target, int offset)
+static void rotate_block(const short *source, short *target, int offset)
{
- short *end;
- short *ptr1;
- short *ptr2;
- short *ptr3;
- ptr2=source+BUFFERSIZE;
- ptr3=ptr1=ptr2-offset;
- end=target+BLOCKSIZE;
- while (target<end) {
- *(target++)=*(ptr3++);
- if (ptr3==ptr2) ptr3=ptr1;
- }
+ int i=0, k=0;
+ const short *ptr1 = source + BUFFERSIZE - offset;
+
+ while (i<BLOCKSIZE) {
+ target[i++] = ptr1[k++];
+
+ if (k == offset)
+ k = 0;
+ }
}
/* inverse root mean square */
-static int irms(short *data, int factor)
+static int irms(const short *data, int factor)
{
- short *p1,*p2;
- unsigned int sum;
- p2=(p1=data)+BLOCKSIZE;
- for (sum=0;p2>p1;p1++) sum+=(*p1)*(*p1);
- if (sum==0) return 0; /* OOPS - division by zero */
- return (0x20000000/(t_sqrt(sum)>>8))*factor;
+ const short *p1, *p2;
+ unsigned int sum;
+
+ p2 = (p1 = data) + BLOCKSIZE;
+ for (sum=0; p2 > p1; p1++)
+ sum += (*p1) * (*p1);
+
+ if (sum == 0)
+ return 0; /* OOPS - division by zero */
+
+ return (0x20000000 / (t_sqrt(sum) >> 8)) * factor;
}
/* multiply/add wavetable */
-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)
+static void add_wav(int n, int f, int m1, int m2, int m3, const short *s1,
+ const short *s2, const short *s3, short *dest)
{
- int a,b,c;
- short *ptr,*ptr2;
-
- ptr=glob->wavtable1+n*9;
- ptr2=glob->wavtable2+n*9;
- if (f!=0) {
- a=((*ptr)*m1)>>((*ptr2)+1);
- } else {
- a=0;
- }
- ptr++;ptr2++;
- b=((*ptr)*m2)>>((*ptr2)+1);
- ptr++;ptr2++;
- c=((*ptr)*m3)>>((*ptr2)+1);
- ptr2=(ptr=dest)+BLOCKSIZE;
- if (f!=0)
- while (ptr<ptr2)
- *(ptr++)=((*(s1++))*a+(*(s2++))*b+(*(s3++))*c)>>12;
- else
- while (ptr<ptr2)
- *(ptr++)=((*(s2++))*b+(*(s3++))*c)>>12;
-}
+ int a, b, c, i;
+ const short *ptr, *ptr2;
+ ptr = wavtable1 + n * 9;
+ ptr2 = wavtable2 + n * 9;
+
+ if (f != 0)
+ a = ((*ptr) * m1) >> ((*ptr2) + 1);
+ else
+ a = 0;
-static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len)
-{
- int x,sum;
- int buffer[10];
- short *ptr;
- short *ptr2;
-
- memcpy(glob->work,statbuf,20);
- memcpy(glob->work+10,i2,len*2);
-
- buffer[9]=i1[0];
- buffer[8]=i1[1];
- buffer[7]=i1[2];
- buffer[6]=i1[3];
- buffer[5]=i1[4];
- buffer[4]=i1[5];
- buffer[3]=i1[6];
- buffer[2]=i1[7];
- buffer[1]=i1[8];
- buffer[0]=i1[9];
-
- ptr2=(ptr=glob->work)+len;
- while (ptr<ptr2) {
- for(sum=0,x=0;x<=9;x++)
- sum+=buffer[x]*(ptr[x]);
- sum=sum>>12;
- x=ptr[10]-sum;
- if (x<-32768 || x>32767)
- {
- memset(out,0,len*2);
- memset(statbuf,0,20);
- return;
- }
- ptr[10]=x;
ptr++;
- }
- memcpy(out,ptr+10-len,len*2);
- memcpy(statbuf,ptr,20);
+ ptr2++;
+ b = ((*ptr) * m2) >> ((*ptr2) + 1);
+ ptr++;
+ ptr2++;
+ c = ((*ptr) * m3) >> ((*ptr2) + 1);
+
+ if (f != 0)
+ for (i=0; i < BLOCKSIZE; i++)
+ dest[i] = ((*(s1++)) * a + (*(s2++)) * b + (*(s3++)) * c) >> 12;
+ else
+ for (i=0; i < BLOCKSIZE; i++)
+ dest[i] = ((*(s2++)) * b + (*(s3++)) * c) >> 12;
}
-/* Decode 20-byte input */
-static void unpack_input(unsigned char *input, unsigned int *output)
+
+static void final(const short *i1, const short *i2,
+ void *out, int *statbuf, int len)
{
- unsigned int outbuffer[28];
- unsigned short inbuffer[10];
- unsigned int x;
- unsigned int *ptr;
-
- /* fix endianness */
- for (x=0;x<20;x+=2)
- inbuffer[x/2]=(input[x]<<8)+input[x+1];
-
- /* unpack */
- ptr=outbuffer;
- *(ptr++)=27;
- *(ptr++)=(inbuffer[0]>>10)&0x3f;
- *(ptr++)=(inbuffer[0]>>5)&0x1f;
- *(ptr++)=inbuffer[0]&0x1f;
- *(ptr++)=(inbuffer[1]>>12)&0xf;
- *(ptr++)=(inbuffer[1]>>8)&0xf;
- *(ptr++)=(inbuffer[1]>>5)&7;
- *(ptr++)=(inbuffer[1]>>2)&7;
- *(ptr++)=((inbuffer[1]<<1)&6)|((inbuffer[2]>>15)&1);
- *(ptr++)=(inbuffer[2]>>12)&7;
- *(ptr++)=(inbuffer[2]>>10)&3;
- *(ptr++)=(inbuffer[2]>>5)&0x1f;
- *(ptr++)=((inbuffer[2]<<2)&0x7c)|((inbuffer[3]>>14)&3);
- *(ptr++)=(inbuffer[3]>>6)&0xff;
- *(ptr++)=((inbuffer[3]<<1)&0x7e)|((inbuffer[4]>>15)&1);
- *(ptr++)=(inbuffer[4]>>8)&0x7f;
- *(ptr++)=(inbuffer[4]>>1)&0x7f;
- *(ptr++)=((inbuffer[4]<<7)&0x80)|((inbuffer[5]>>9)&0x7f);
- *(ptr++)=(inbuffer[5]>>2)&0x7f;
- *(ptr++)=((inbuffer[5]<<5)&0x60)|((inbuffer[6]>>11)&0x1f);
- *(ptr++)=(inbuffer[6]>>4)&0x7f;
- *(ptr++)=((inbuffer[6]<<4)&0xf0)|((inbuffer[7]>>12)&0xf);
- *(ptr++)=(inbuffer[7]>>5)&0x7f;
- *(ptr++)=((inbuffer[7]<<2)&0x7c)|((inbuffer[8]>>14)&3);
- *(ptr++)=(inbuffer[8]>>7)&0x7f;
- *(ptr++)=((inbuffer[8]<<1)&0xfe)|((inbuffer[9]>>15)&1);
- *(ptr++)=(inbuffer[9]>>8)&0x7f;
- *(ptr++)=(inbuffer[9]>>1)&0x7f;
-
- *(output++)=outbuffer[11];
- for (x=1;x<11;*(output++)=outbuffer[x++]);
- ptr=outbuffer+12;
- for (x=0;x<16;x+=4)
- {
- *(output++)=ptr[x];
- *(output++)=ptr[x+2];
- *(output++)=ptr[x+3];
- *(output++)=ptr[x+1];
- }
+ int x, sum, i;
+ int buffer[10];
+ short *ptr;
+ short *ptr2;
+ unsigned short int work[50];
+
+ memcpy(work, statbuf,20);
+ memcpy(work + 10, i2, len * 2);
+
+ for(i=0; i<10; i++)
+ buffer[9-i] = i1[i];
+
+ ptr2 = (ptr = work) + len;
+
+ while (ptr < ptr2) {
+ for(sum=0, x=0; x<=9; x++)
+ sum += buffer[x] * (ptr[x]);
+
+ sum = sum >> 12;
+ x = ptr[10] - sum;
+
+ if (x<-32768 || x>32767) {
+ memset(out, 0, len * 2);
+ memset(statbuf, 0, 20);
+ return;
+ }
+
+ ptr[10] = x;
+ ptr++;
+ }
+ memcpy(out, ptr+10 - len, len * 2);
+ memcpy(statbuf, ptr, 20);
}
-static unsigned int rms(int *data, int f)
+static unsigned int rms(const int *data, int f)
{
- int *c;
- int x;
- unsigned int res;
- int b;
-
- c=data;
- b=0;
- res=0x10000;
- for (x=0;x<10;x++)
- {
- res=(((0x1000000-(*c)*(*c))>>12)*res)>>12;
- if (res==0) return 0;
- if (res<=0x3fff)
- {
- while (res<=0x3fff)
- {
- b++;
- res<<=2;
- }
- } else {
- if (res>0x10000)
- return 0; /* We're screwed, might as well go out with a bang. :P */
+ const int *c;
+ int x;
+ unsigned int res;
+ int b;
+
+ c = data;
+ b = 0;
+ res = 0x10000;
+ for (x=0; x<10; x++) {
+ res = (((0x1000000 - (*c) * (*c)) >> 12) * res) >> 12;
+
+ if (res == 0)
+ return 0;
+
+ if (res <= 0x3fff) {
+ while (res <= 0x3fff) {
+ b++;
+ res <<= 2;
+ }
+ } else {
+ if (res > 0x10000)
+ return 0; /* We're screwed, might as well go out with a bang. :P */
+ }
+ c++;
}
- c++;
- }
- if (res>0) res=t_sqrt(res);
- res>>=(b+10);
- res=(res*f)>>10;
- return res;
+ if (res > 0)
+ res = t_sqrt(res);
+
+ res >>= (b + 10);
+ res = (res * f) >> 10;
+ return res;
}
-static void dec1(Real144_internal *glob, int *data, int *inp, int n, int f)
+static void dec1(Real144_internal *glob, const int *data, const int *inp,
+ int n, int f)
{
- short *ptr,*end;
+ short *ptr,*end;
+
+ *(glob->decptr++) = rms(data, f);
+ glob->decptr++;
+ end = (ptr = glob->decsp) + (n * 10);
- *(glob->decptr++)=rms(data,f);
- glob->decptr++;
- end=(ptr=glob->decsp)+(n*10);
- while (ptr<end) *(ptr++)=*(inp++);
+ while (ptr < end)
+ *(ptr++) = *(inp++);
}
-static int eq(Real144_internal *glob, short *in, int *target)
+static int eq(const short *in, int *target)
{
- int retval;
- int a;
- int b;
- int c;
- unsigned int u;
- short *sptr;
- int *ptr1,*ptr2,*ptr3;
- int *bp1,*bp2,*temp;
-
- retval=0;
- bp1=glob->buffer1;
- bp2=glob->buffer2;
- ptr2=(ptr3=glob->buffer2)+9;
- sptr=in;
- while (ptr2>=ptr3)
- *(ptr3++)=*(sptr++);
-
- target+=9;
- a=bp2[9];
- *target=a;
- if (a+0x1000>0x1fff)
- return 0; /* We're screwed, might as well go out with a bang. :P */
- c=8;u=a;
- while (c>=0)
- {
- if (u==0x1000) u++;
- if (u==0xfffff000) u--;
- b=0x1000-((u*u)>>12);
- if (b==0) b++;
- ptr2=bp1;
- ptr1=(ptr3=bp2)+c;
- for (u=0;u<=c;u++)
- *(ptr2++)=((*(ptr3++)-(((*target)*(*(ptr1--)))>>12))*(0x1000000/b))>>12;
- *(--target)=u=bp1[(c--)];
- if ((u+0x1000)>0x1fff) retval=1;
- temp=bp2;
- bp2=bp1;
- bp1=temp;
- }
- return retval;
+ int retval;
+ int a;
+ int b;
+ int c;
+ unsigned int u;
+ const short *sptr;
+ int *ptr1, *ptr2, *ptr3;
+ int *bp1, *bp2;
+ int buffer1[10];
+ int buffer2[10];
+
+ retval = 0;
+ bp1 = buffer1;
+ bp2 = buffer2;
+ ptr2 = (ptr3 = buffer2) + 9;
+ sptr = in;
+
+ while (ptr2 >= ptr3)
+ *(ptr3++) = *(sptr++);
+
+ target += 9;
+ a = bp2[9];
+ *target = a;
+
+ if (a + 0x1000 > 0x1fff)
+ return 0; /* We're screwed, might as well go out with a bang. :P */
+
+ c = 8;
+ u = a;
+
+ while (c >= 0) {
+ if (u == 0x1000)
+ u++;
+
+ if (u == 0xfffff000)
+ u--;
+
+ b = 0x1000-((u * u) >> 12);
+
+ if (b == 0)
+ b++;
+
+ ptr2 = bp1;
+ ptr1 = (ptr3 = bp2) + c;
+
+ for (u=0; u<=c; u++)
+ *(ptr2++) = ((*(ptr3++) - (((*target) * (*(ptr1--))) >> 12)) * (0x1000000 / b)) >> 12;
+
+ *(--target) = u = bp1[(c--)];
+
+ if ((u + 0x1000) > 0x1fff)
+ retval = 1;
+
+ FFSWAP(int *, bp1, bp2);
+ }
+ return retval;
}
-static void dec2(Real144_internal *glob, int *data, int *inp, int n, int f, int *inp2, int l)
+static void dec2(Real144_internal *glob, const int *data, const int *inp,
+ int n, int f, const int *inp2, int l)
{
- unsigned int *ptr1,*ptr2;
- int work[10];
- int a,b;
- int x;
- int result;
-
- if(l+1<NBLOCKS/2) a=NBLOCKS-(l+1);
- else a=l+1;
- b=NBLOCKS-a;
- if (l==0)
- {
- glob->decsp=glob->sptr=glob->gbuf2;
- glob->decptr=glob->gbuf1;
- }
- ptr1=inp;
- ptr2=inp2;
- for (x=0;x<10*n;x++)
- *(glob->sptr++)=(a*(*ptr1++)+b*(*ptr2++))>>2;
- result=eq(glob,glob->decsp,work);
- if (result==1)
- {
- dec1(glob,data,inp,n,f);
- } else {
- *(glob->decptr++)=rms(work,f);
- glob->decptr++;
- }
- glob->decsp+=n*10;
+ unsigned const int *ptr1,*ptr2;
+ int work[10];
+ int a,b;
+ int x;
+ int result;
+
+ if(l + 1 < NBLOCKS / 2)
+ a = NBLOCKS - (l + 1);
+ else
+ a = l + 1;
+
+ b = NBLOCKS - a;
+
+ if (l == 0) {
+ glob->decsp = glob->sptr = glob->gbuf2;
+ glob->decptr = glob->gbuf1;
+ }
+ ptr1 = inp;
+ ptr2 = inp2;
+
+ for (x=0; x<10*n; x++)
+ *(glob->sptr++) = (a * (*ptr1++) + b * (*ptr2++)) >> 2;
+
+ result = eq(glob->decsp, work);
+
+ if (result == 1) {
+ dec1(glob, data, inp, n, f);
+ } else {
+ *(glob->decptr++) = rms(work, f);
+ glob->decptr++;
+ }
+ glob->decsp += n * 10;
}
/* Uncompress one block (20 bytes -> 160*2 bytes) */
static int ra144_decode_frame(AVCodecContext * avctx,
void *vdata, int *data_size,
- uint8_t * buf, int buf_size)
+ const uint8_t * buf, int buf_size)
{
- unsigned int a,b,c;
- long s;
- signed short *shptr;
- unsigned int *lptr,*temp;
- const short **dptr;
- int16_t *datao;
- int16_t *data = vdata;
- Real144_internal *glob=avctx->priv_data;
-
- if(buf_size==0)
- return 0;
+ static const uint8_t sizes[10] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
+ unsigned int a, b, c;
+ int i;
+ signed short *shptr;
+ int16_t *datao;
+ int16_t *data = vdata;
+ unsigned int val;
+
+ Real144_internal *glob = avctx->priv_data;
+ GetBitContext gb;
+
+ if(buf_size == 0)
+ return 0;
- datao = data;
- unpack_input(buf,glob->unpacked);
+ datao = data;
- glob->iptr=glob->unpacked;
- glob->val=decodetable[0][(*(glob->iptr++))<<1];
+ init_get_bits(&gb, buf, 20 * 8);
- dptr=decodetable+1;
- lptr=glob->swapbuf1;
- while (lptr<glob->swapbuf1+10)
- *(lptr++)=(*(dptr++))[(*(glob->iptr++))<<1];
+ for (i=0; i<10; i++)
+ // "<< 1"? Doesn't this make one value out of two of the table useless?
+ glob->swapbuf1[i] = decodetable[i][get_bits(&gb, sizes[i]) << 1];
- do_voice(glob->swapbuf1,glob->swapbuf2);
+ do_voice(glob->swapbuf1, glob->swapbuf2);
- a=t_sqrt(glob->val*glob->oldval)>>12;
+ val = decodeval[get_bits(&gb, 5) << 1]; // Useless table entries?
+ a = t_sqrt(val*glob->oldval) >> 12;
- for (c=0;c<NBLOCKS;c++) {
- if (c==(NBLOCKS-1)) {
- dec1(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val);
- } else {
- if (c*2==(NBLOCKS-2)) {
- if (glob->oldval<glob->val) {
- dec2(glob,glob->swapbuf1,glob->swapbuf2,3,a,glob->swapbuf2alt,c);
+ for (c=0; c < NBLOCKS; c++) {
+ if (c == (NBLOCKS - 1)) {
+ dec1(glob, glob->swapbuf1, glob->swapbuf2, 3, val);
} else {
- dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,a,glob->swapbuf2,c);
+ if (c * 2 == (NBLOCKS - 2)) {
+ if (glob->oldval < val) {
+ dec2(glob, glob->swapbuf1, glob->swapbuf2, 3, a, glob->swapbuf2alt, c);
+ } else {
+ dec2(glob, glob->swapbuf1alt, glob->swapbuf2alt, 3, a, glob->swapbuf2, c);
+ }
+ } else {
+ if (c * 2 < (NBLOCKS - 2)) {
+ dec2(glob, glob->swapbuf1alt, glob->swapbuf2alt, 3, glob->oldval, glob->swapbuf2, c);
+ } else {
+ dec2(glob, glob->swapbuf1, glob->swapbuf2, 3, val, glob->swapbuf2alt, c);
+ }
+ }
}
- } else {
- if (c*2<(NBLOCKS-2)) {
- dec2(glob,glob->swapbuf1alt,glob->swapbuf2alt,3,glob->oldval,glob->swapbuf2,c);
- } else {
- dec2(glob,glob->swapbuf1,glob->swapbuf2,3,glob->val,glob->swapbuf2alt,c);
- }
- }
}
- }
-
- /* do output */
- for (b=0,c=0;c<4;c++) {
- glob->gval=glob->gbuf1[c*2];
- glob->gsp=glob->gbuf2+b;
- do_output_subblock(glob,glob->resetflag);
- glob->resetflag=0;
-
- shptr=glob->output_buffer;
- while (shptr<glob->output_buffer+BLOCKSIZE) {
- s=*(shptr++)<<2;
- *data=s;
- if (s>32767) *data=32767;
- if (s<-32767) *data=-32768;
- data++;
+
+ /* do output */
+ for (b=0, c=0; c<4; c++) {
+ unsigned int gval = glob->gbuf1[c * 2];
+ unsigned short *gsp = glob->gbuf2 + b;
+ signed short output_buffer[40];
+
+ do_output_subblock(glob, gsp, gval, output_buffer, &gb);
+
+ shptr = output_buffer;
+ while (shptr < output_buffer + BLOCKSIZE)
+ *data++ = av_clip_int16(*(shptr++) << 2);
+ b += 30;
}
- b+=30;
- }
-
- glob->oldval=glob->val;
- temp=glob->swapbuf1alt;
- glob->swapbuf1alt=glob->swapbuf1;
- glob->swapbuf1=temp;
- temp=glob->swapbuf2alt;
- glob->swapbuf2alt=glob->swapbuf2;
- glob->swapbuf2=temp;
- *data_size=(data-datao)*sizeof(*data);
- return 20;
+
+ glob->oldval = val;
+
+ FFSWAP(unsigned int *, glob->swapbuf1alt, glob->swapbuf1);
+ FFSWAP(unsigned int *, glob->swapbuf2alt, glob->swapbuf2);
+
+ *data_size = (data-datao)*sizeof(*data);
+ return 20;
}
NULL,
NULL,
ra144_decode_frame,
+ .long_name = "RealAudio 1.0 (14.4K)",
};
projects / ffmpeg / blobdiff