mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
f863bee841
patch by Vitor Sessak, vitor1001 gmail com Originally committed as revision 13109 to svn://svn.ffmpeg.org/ffmpeg/trunk
544 lines
13 KiB
C
544 lines
13 KiB
C
/*
|
|
* Real Audio 1.0 (14.4K)
|
|
* Copyright (c) 2003 the ffmpeg project
|
|
*
|
|
* 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 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* 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 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 */
|
|
#define BUFFERSIZE 146 /* for do_output */
|
|
|
|
|
|
/* 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;
|
|
|
|
static int ra144_decode_init(AVCodecContext * avctx)
|
|
{
|
|
Real144_internal *glob = avctx->priv_data;
|
|
|
|
glob->resetflag = 1;
|
|
glob->swapbuf1 = glob->swapb1a;
|
|
glob->swapbuf2 = glob->swapb2a;
|
|
glob->swapbuf1alt = glob->swapb1b;
|
|
glob->swapbuf2alt = glob->swapb2b;
|
|
|
|
memcpy(glob->wavtable1, wavtable1, sizeof(wavtable1));
|
|
memcpy(glob->wavtable2, wavtable2, sizeof(wavtable2));
|
|
|
|
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 */
|
|
static int t_sqrt(unsigned int x)
|
|
{
|
|
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)
|
|
{
|
|
int buffer[10];
|
|
int *b1, *b2;
|
|
int x, y;
|
|
int *ptr, *tmp;
|
|
|
|
b1 = buffer;
|
|
b2 = a2;
|
|
|
|
for (x=0; x < 10; x++) {
|
|
b1[x] = (*a1) << 4;
|
|
|
|
if(x > 0) {
|
|
ptr = b2 + x;
|
|
for (y=0; y <= x - 1; y++)
|
|
b1[y] = (((*a1) * (*(--ptr))) >> 12) + b2[y];
|
|
}
|
|
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);
|
|
}
|
|
|
|
/* rotate block */
|
|
static void rotate_block(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;
|
|
}
|
|
}
|
|
|
|
/* inverse root mean square */
|
|
static int irms(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;
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
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;
|
|
}
|
|
|
|
|
|
static void final(Real144_internal *glob, short *i1, short *i2, void *out,
|
|
int *statbuf, int len)
|
|
{
|
|
int x, sum, i;
|
|
int buffer[10];
|
|
short *ptr;
|
|
short *ptr2;
|
|
|
|
memcpy(glob->work, statbuf,20);
|
|
memcpy(glob->work + 10, i2, len * 2);
|
|
|
|
for(i=0; i<10; i++)
|
|
buffer[9-i] = i1[i];
|
|
|
|
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);
|
|
}
|
|
|
|
/* Decode 20-byte input */
|
|
static void unpack_input(const unsigned char *input, unsigned int *output)
|
|
{
|
|
int i;
|
|
static const uint8_t sizes[10] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
|
|
|
|
GetBitContext gb;
|
|
|
|
init_get_bits(&gb, input, 20 * 8);
|
|
|
|
for (i=0; i<10; i++)
|
|
output[i+1] = get_bits(&gb, sizes[i]);
|
|
|
|
output[0] = get_bits(&gb, 5);
|
|
|
|
output += 11;
|
|
for (i=0; i<4; i++) {
|
|
output[0] = get_bits(&gb, 7);
|
|
output[3] = get_bits(&gb, 8);
|
|
output[1] = get_bits(&gb, 7);
|
|
output[2] = get_bits(&gb, 7);
|
|
output += 4;
|
|
}
|
|
}
|
|
|
|
static unsigned int rms(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 */
|
|
}
|
|
c++;
|
|
}
|
|
|
|
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)
|
|
{
|
|
short *ptr,*end;
|
|
|
|
*(glob->decptr++) = rms(data, f);
|
|
glob->decptr++;
|
|
end = (ptr = glob->decsp) + (n * 10);
|
|
|
|
while (ptr < end)
|
|
*(ptr++) = *(inp++);
|
|
}
|
|
|
|
static int eq(Real144_internal *glob, 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;
|
|
}
|
|
|
|
static void dec2(Real144_internal *glob, int *data, int *inp, int n, int f,
|
|
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;
|
|
}
|
|
|
|
/* Uncompress one block (20 bytes -> 160*2 bytes) */
|
|
static int ra144_decode_frame(AVCodecContext * avctx,
|
|
void *vdata, int *data_size,
|
|
const uint8_t * buf, int buf_size)
|
|
{
|
|
unsigned int a, b, c;
|
|
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;
|
|
|
|
datao = data;
|
|
unpack_input(buf, glob->unpacked);
|
|
|
|
glob->iptr = glob->unpacked;
|
|
glob->val = decodetable[0][(*(glob->iptr++)) << 1];
|
|
|
|
dptr = decodetable + 1;
|
|
lptr = glob->swapbuf1;
|
|
|
|
while (lptr<glob->swapbuf1 + 10)
|
|
*(lptr++) = (*(dptr++))[(*(glob->iptr++)) << 1];
|
|
|
|
do_voice(glob->swapbuf1, glob->swapbuf2);
|
|
|
|
a = t_sqrt(glob->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);
|
|
} 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);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* 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)
|
|
*data++ = av_clip_int16(*(shptr++) << 2);
|
|
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;
|
|
}
|
|
|
|
|
|
AVCodec ra_144_decoder =
|
|
{
|
|
"real_144",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_RA_144,
|
|
sizeof(Real144_internal),
|
|
ra144_decode_init,
|
|
NULL,
|
|
NULL,
|
|
ra144_decode_frame,
|
|
.long_name = "RealAudio 1.0 (14.4K)",
|
|
};
|