a40b2c2a4b
Originally committed as revision 14038 to svn://svn.ffmpeg.org/ffmpeg/trunk
278 lines
6.6 KiB
C
278 lines
6.6 KiB
C
/*
|
|
* RealAudio 2.0 (28.8K)
|
|
* 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"
|
|
#define ALT_BITSTREAM_READER_LE
|
|
#include "bitstream.h"
|
|
#include "ra288.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;
|
|
|
|
/* initial decode */
|
|
static void unpack(unsigned short *tgt, const unsigned char *src,
|
|
unsigned int len)
|
|
{
|
|
int i = 0;
|
|
GetBitContext gb;
|
|
|
|
init_get_bits(&gb, src, len * 8);
|
|
|
|
while (get_bits_count(&gb) + 9 + (i&1) <= len*8) {
|
|
tgt[i] = get_bits(&gb, 9 + (i&1));
|
|
i++;
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
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;
|
|
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 */
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
static void * decode_block(AVCodecContext * avctx, const unsigned char *in,
|
|
signed short int *out, unsigned len)
|
|
{
|
|
int x, y;
|
|
Real288_internal *glob = avctx->priv_data;
|
|
unsigned short int buffer[len];
|
|
|
|
unpack(buffer, in, len);
|
|
|
|
for (x=0; x < 32; x++) {
|
|
glob->phasep = (glob->phase = x & 7) * 5;
|
|
decode(glob, buffer[x]);
|
|
|
|
for (y=0; y<5; *(out++) = 8 * glob->output[glob->phasep+(y++)]);
|
|
|
|
if (glob->phase == 3)
|
|
update(glob);
|
|
}
|
|
|
|
return out;
|
|
}
|
|
|
|
/* Decode a block (celp) */
|
|
static int ra288_decode_frame(AVCodecContext * avctx, void *data,
|
|
int *data_size, const uint8_t * buf,
|
|
int buf_size)
|
|
{
|
|
void *datao;
|
|
|
|
if (buf_size < avctx->block_align) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"ffra288: Error! Input buffer is too small [%d<%d]\n",
|
|
buf_size, avctx->block_align);
|
|
return 0;
|
|
}
|
|
|
|
datao = data;
|
|
data = decode_block(avctx, buf, (signed short *)data, avctx->block_align);
|
|
|
|
*data_size = (char *)data - (char *)datao;
|
|
return avctx->block_align;
|
|
}
|
|
|
|
AVCodec ra_288_decoder =
|
|
{
|
|
"real_288",
|
|
CODEC_TYPE_AUDIO,
|
|
CODEC_ID_RA_288,
|
|
sizeof(Real288_internal),
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
ra288_decode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("RealAudio 2.0 (28.8K)"),
|
|
};
|