*/
#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];
-} Real144_internal;
+ unsigned int old_energy; ///< previous frame energy
+
+ /* the swapped buffers */
+ unsigned int lpc_tables[4][10];
+ unsigned int *lpc_refl; ///< LPC reflection coefficients
+ unsigned int *lpc_coef; ///< LPC coefficients
+ unsigned int *lpc_refl_old; ///< previous frame LPC reflection coefs
+ unsigned int *lpc_coef_old; ///< previous frame LPC coefficients
+
+ unsigned int buffer[5];
+ uint16_t adapt_cb[148]; ///< adaptive codebook
+} RA144Context;
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;
+ RA144Context *ractx = avctx->priv_data;
- memcpy(glob->wavtable1,wavtable1,sizeof(wavtable1));
- memcpy(glob->wavtable2,wavtable2,sizeof(wavtable2));
+ ractx->lpc_refl = ractx->lpc_tables[0];
+ ractx->lpc_coef = ractx->lpc_tables[1];
+ ractx->lpc_refl_old = ractx->lpc_tables[2];
+ ractx->lpc_coef_old = ractx->lpc_tables[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);
-/* lookup square roots in table */
+/**
+ * Evaluate sqrt(x << 24). x must fit in 20 bits. This value is evaluated in an
+ * odd way to make the output identical to the binary decoder.
+ */
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 (ff_sqrt(x << 20) << s) << 2;
}
-/* do 'voice' */
-static void do_voice(int *a1, int *a2)
+/**
+ * Evaluate the LPC filter coefficients from the reflection coefficients.
+ * Does the inverse of the eval_refl() function.
+ */
+static void eval_coefs(const int *refl, int *coefs)
{
- int buffer[10];
- int *b1,*b2;
- int x,y;
- int *ptr,*tmp;
+ int buffer[10];
+ int *b1 = buffer;
+ int *b2 = coefs;
+ int x, y;
- b1=buffer;
- b2=a2;
+ for (x=0; x < 10; x++) {
+ b1[x] = refl[x] << 4;
- for (x=0;x<10;x++) {
- b1[x]=(*a1)<<4;
+ for (y=0; y < x; y++)
+ b1[y] = ((refl[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;
-}
-
-/* do quarter-block output */
-static void do_output_subblock(Real144_internal *glob, unsigned int x)
-{
- 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);
+ for (x=0; x < 10; x++)
+ coefs[x] >>= 4;
}
/* rotate block */
-static void rotate_block(short *source, short *target, int offset)
+static void rotate_block(const int16_t *source, int16_t *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;
+ source += BUFFERSIZE - offset;
+
+ while (i<BLOCKSIZE) {
+ target[i++] = source[k++];
+
+ if (k == offset)
+ k = 0;
+ }
}
/* inverse root mean square */
-static int irms(short *data, int factor)
+static int irms(const int16_t *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;
+ unsigned int i, sum = 0;
+
+ for (i=0; i < BLOCKSIZE; i++)
+ sum += data[i] * data[i];
+
+ 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 skip_first, int *m, const int16_t *s1,
+ const int8_t *s2, const int8_t *s3, int16_t *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 i;
+ int v[3];
+
+ v[0] = 0;
+ for (i=!skip_first; i<3; i++)
+ v[i] = (wavtable1[n][i] * m[i]) >> (wavtable2[n][i] + 1);
+
+ for (i=0; i < BLOCKSIZE; i++)
+ dest[i] = ((*(s1++))*v[0] + (*(s2++))*v[1] + (*(s3++))*v[2]) >> 12;
}
-static void final(Real144_internal *glob, short *i1, short *i2, void *out, int *statbuf, int len)
+static void final(const int16_t *i1, const int16_t *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;
+ int x, i;
+ uint16_t work[50];
+ int16_t *ptr = work;
+
+ memcpy(work, statbuf,20);
+ memcpy(work + 10, i2, len * 2);
+
+ for (i=0; i<len; i++) {
+ int sum = 0;
+ int new_val;
+
+ for(x=0; x<10; x++)
+ sum += i1[9-x] * ptr[x];
+
+ sum >>= 12;
+
+ new_val = ptr[10] - sum;
+
+ if (new_val < -32768 || new_val > 32767) {
+ memset(out, 0, len * 2);
+ memset(statbuf, 0, 20);
+ return;
+ }
+
+ ptr[10] = new_val;
+ ptr++;
}
- ptr[10]=x;
- ptr++;
- }
- memcpy(out,ptr+10-len,len*2);
- memcpy(statbuf,ptr,20);
+
+ memcpy(out, work+10, len * 2);
+ memcpy(statbuf, work + 40, 20);
}
-/* Decode 20-byte input */
-static void unpack_input(unsigned char *input, unsigned int *output)
+static unsigned int rms(const int *data, int f, RA144Context *ractx)
{
- 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;
+ unsigned int res = 0x10000;
+ int b = 0;
+
+ for (x=0; x<10; x++) {
+ res = (((0x1000000 - (*data) * (*data)) >> 12) * res) >> 12;
+
+ if (res == 0)
+ return 0;
+
+ if (res > 0x10000) {
+ av_log(ractx, AV_LOG_ERROR, "Overflow. Broken sample?\n");
+ return 0;
+ }
+
+ while (res <= 0x3fff) {
+ b++;
+ res <<= 2;
+ }
+ data++;
+ }
+
+ if (res > 0)
+ res = t_sqrt(res);
+
+ res >>= (b + 10);
+ res = (res * f) >> 10;
+ return res;
}
-static unsigned int rms(int *data, int f)
+/* do quarter-block output */
+static void do_output_subblock(RA144Context *ractx,
+ const uint16_t *lpc_coefs, unsigned int gval,
+ int16_t *output_buffer, GetBitContext *gb)
{
- 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;
- }
+ uint16_t buffer_a[40];
+ uint16_t *block;
+ int cba_idx = get_bits(gb, 7); // index of the adaptive CB, 0 if none
+ int gain = get_bits(gb, 8);
+ int cb1_idx = get_bits(gb, 7);
+ int cb2_idx = get_bits(gb, 7);
+ int m[3];
+
+ if (cba_idx) {
+ cba_idx += HALFBLOCK - 1;
+ rotate_block(ractx->adapt_cb, buffer_a, cba_idx);
+ m[0] = irms(buffer_a, gval) >> 12;
} else {
- if (res>0x10000)
- return 0; /* We're screwed, might as well go out with a bang. :P */
+ m[0] = 0;
}
- c++;
- }
- if (res>0) res=t_sqrt(res);
- res>>=(b+10);
- res=(res*f)>>10;
- return res;
+ m[1] = ((ftable1[cb1_idx] >> 4) * gval) >> 8;
+ m[2] = ((ftable2[cb2_idx] >> 4) * gval) >> 8;
+
+ memmove(ractx->adapt_cb, ractx->adapt_cb + BLOCKSIZE,
+ (BUFFERSIZE - BLOCKSIZE) * 2);
+
+ block = ractx->adapt_cb + BUFFERSIZE - BLOCKSIZE;
+
+ add_wav(gain, cba_idx, m, buffer_a, etable1[cb1_idx], etable2[cb2_idx],
+ block);
+
+ final(lpc_coefs, block, output_buffer, ractx->buffer, BLOCKSIZE);
}
-static void dec1(Real144_internal *glob, int *data, int *inp, int n, int f)
+static void int_to_int16(int16_t *decsp, const int *inp)
{
- short *ptr,*end;
+ int i;
- *(glob->decptr++)=rms(data,f);
- glob->decptr++;
- end=(ptr=glob->decsp)+(n*10);
- while (ptr<end) *(ptr++)=*(inp++);
+ for (i=0; i<30; i++)
+ *(decsp++) = *(inp++);
}
-static int eq(Real144_internal *glob, short *in, int *target)
+/**
+ * Evaluate the reflection coefficients from the filter coefficients.
+ * Does the inverse of the eval_coefs() function.
+ *
+ * @return 1 if one of the reflection coefficients is of magnitude greater than
+ * 4095, 0 if not.
+ */
+static int eval_refl(const int16_t *coefs, int *refl, RA144Context *ractx)
{
- 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 = 0;
+ int b, c, i;
+ unsigned int u;
+ int buffer1[10];
+ int buffer2[10];
+ int *bp1 = buffer1;
+ int *bp2 = buffer2;
+
+ for (i=0; i < 10; i++)
+ buffer2[i] = coefs[i];
+
+ u = refl[9] = bp2[9];
+
+ if (u + 0x1000 > 0x1fff) {
+ av_log(ractx, AV_LOG_ERROR, "Overflow. Broken sample?\n");
+ return 0;
+ }
+
+ for (c=8; c >= 0; c--) {
+ if (u == 0x1000)
+ u++;
+
+ if (u == 0xfffff000)
+ u--;
+
+ b = 0x1000-((u * u) >> 12);
+
+ if (b == 0)
+ b++;
+
+ for (u=0; u<=c; u++)
+ bp1[u] = ((bp2[u] - ((refl[c+1] * bp2[c-u]) >> 12)) * (0x1000000 / b)) >> 12;
+
+ refl[c] = 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 int interp(RA144Context *ractx, int16_t *decsp, int block_num,
+ int copynew, int energy)
{
- 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;
+ int work[10];
+ int a = block_num + 1;
+ int b = NBLOCKS - a;
+ int x;
+
+ // Interpolate block coefficients from the this frame forth block and
+ // last frame forth block
+ for (x=0; x<30; x++)
+ decsp[x] = (a * ractx->lpc_coef[x] + b * ractx->lpc_coef_old[x])>> 2;
+
+ if (eval_refl(decsp, work, ractx)) {
+ // The interpolated coefficients are unstable, copy either new or old
+ // coefficients
+ if (copynew) {
+ int_to_int16(decsp, ractx->lpc_coef);
+ return rms(ractx->lpc_refl, energy, ractx);
+ } else {
+ int_to_int16(decsp, ractx->lpc_coef_old);
+ return rms(ractx->lpc_refl_old, energy, ractx);
+ }
+ } else {
+ return rms(work, energy, ractx);
+ }
}
/* 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)
+ void *vdata, int *data_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;
+ static const uint8_t sizes[10] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
+ unsigned int refl_rms[4]; // RMS of the reflection coefficients
+ uint16_t block_coefs[4][30]; // LPC coefficients of each sub-block
+ int i, c;
+ int16_t *data = vdata;
+ unsigned int energy;
+
+ RA144Context *ractx = avctx->priv_data;
+ GetBitContext gb;
+
+ if(buf_size < 20) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Frame too small (%d bytes). Truncated file?\n", buf_size);
+ return buf_size;
+ }
+ init_get_bits(&gb, buf, 20 * 8);
- if(buf_size==0)
- return 0;
+ for (i=0; i<10; i++)
+ // "<< 1"? Doesn't this make one value out of two of the table useless?
+ ractx->lpc_refl[i] = decodetable[i][get_bits(&gb, sizes[i]) << 1];
- datao = data;
- unpack_input(buf,glob->unpacked);
+ eval_coefs(ractx->lpc_refl, ractx->lpc_coef);
- glob->iptr=glob->unpacked;
- glob->val=decodetable[0][(*(glob->iptr++))<<1];
+ energy = decodeval[get_bits(&gb, 5) << 1]; // Useless table entries?
- dptr=decodetable+1;
- lptr=glob->swapbuf1;
- while (lptr<glob->swapbuf1+10)
- *(lptr++)=(*(dptr++))[(*(glob->iptr++))<<1];
+ refl_rms[0] = interp(ractx, block_coefs[0], 0, 0, ractx->old_energy);
+ refl_rms[1] = interp(ractx, block_coefs[1], 1, energy > ractx->old_energy,
+ t_sqrt(energy*ractx->old_energy) >> 12);
+ refl_rms[2] = interp(ractx, block_coefs[2], 2, 1, energy);
+ refl_rms[3] = rms(ractx->lpc_refl, energy, ractx);
- do_voice(glob->swapbuf1,glob->swapbuf2);
+ int_to_int16(block_coefs[3], ractx->lpc_coef);
- a=t_sqrt(glob->val*glob->oldval)>>12;
+ /* do output */
+ for (c=0; c<4; c++) {
+ do_output_subblock(ractx, block_coefs[c], refl_rms[c], data, &gb);
- 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);
- } 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,glob->val,glob->swapbuf2alt,c);
+ for (i=0; i<BLOCKSIZE; i++) {
+ *data = av_clip_int16(*data << 2);
+ data++;
}
- }
}
- }
-
- /* 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=av_clip_int16(s);
- data++;
- }
- 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;
+
+ ractx->old_energy = energy;
+
+ FFSWAP(unsigned int *, ractx->lpc_refl_old, ractx->lpc_refl);
+ FFSWAP(unsigned int *, ractx->lpc_coef_old, ractx->lpc_coef);
+
+ *data_size = 2*160;
+ return 20;
}
"real_144",
CODEC_TYPE_AUDIO,
CODEC_ID_RA_144,
- sizeof(Real144_internal),
+ sizeof(RA144Context),
ra144_decode_init,
NULL,
NULL,
ra144_decode_frame,
+ .long_name = "RealAudio 1.0 (14.4K)",
};
projects / ffmpeg / blobdiff