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Revert r13499, log:

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Make lpc coefficients 16 bit wide

Only one of my samples didn't decode bit-exact after this change,
but better be safe than sorry.

Originally committed as revision 13560 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-05-30 19:46:43 +00:00
parent 180b7026b9
commit 27f19ed501
1 changed files with 40 additions and 38 deletions
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78
libavcodec/ra144.c
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@ -21,7 +21,6 @@
#include "avcodec.h"
#include "bitstream.h"
#include "acelp_vectors.h"
#include "ra144.h"
#define NBLOCKS 4 /* number of segments within a block */
@ -35,12 +34,11 @@ typedef struct {
unsigned int old_energy; ///< previous frame energy
/* the swapped buffers */
unsigned int refl_tables[2][10];
int16_t coef_tables[2][10];
unsigned int lpc_tables[4][10];
unsigned int *lpc_refl; ///< LPC reflection coefficients
int16_t *lpc_coef; ///< LPC coefficients
unsigned int *lpc_coef; ///< LPC coefficients
unsigned int *lpc_refl_old; ///< previous frame LPC reflection coefs
int16_t *lpc_coef_old; ///< previous frame LPC coefficients
unsigned int *lpc_coef_old; ///< previous frame LPC coefficients
unsigned int buffer[5];
uint16_t adapt_cb[148]; ///< adaptive codebook
@ -50,10 +48,10 @@ static int ra144_decode_init(AVCodecContext * avctx)
{
RA144Context *ractx = avctx->priv_data;
ractx->lpc_refl = ractx->refl_tables[0];
ractx->lpc_coef = ractx->coef_tables[0];
ractx->lpc_refl_old = ractx->refl_tables[1];
ractx->lpc_coef_old = ractx->coef_tables[1];
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;
}
@ -74,17 +72,13 @@ static int t_sqrt(unsigned int x)
}
/* do 'voice' */
static void do_voice(const int *a1, int16_t *a2)
static void do_voice(const int *a1, int *a2)
{
int buffer[10];
int buffer2[10];
int *b1 = buffer;
int *b2 = buffer2;
int *b2 = a2;
int x, y;
for (x=0; x<10; x++)
buffer2[x] = a2[x];
for (x=0; x < 10; x++) {
b1[x] = a1[x] << 4;
@ -95,7 +89,7 @@ static void do_voice(const int *a1, int16_t *a2)
}
for (x=0; x < 10; x++)
a2[x] = buffer2[x] >> 4;
a2[x] >>= 4;
}
/* rotate block */
@ -242,6 +236,16 @@ static void do_output_subblock(RA144Context *ractx,
final(gsp, block, output_buffer, ractx->buffer, BLOCKSIZE);
}
static int dec1(int16_t *decsp, const int *data, const int *inp, int f)
{
int i;
for (i=0; i<30; i++)
*(decsp++) = *(inp++);
return rms(data, f);
}
static int eq(const int16_t *in, int *target)
{
int retval = 0;
@ -289,22 +293,22 @@ static int dec2(RA144Context *ractx, int16_t *decsp, int block_num,
int copynew, int f)
{
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
ff_acelp_weighted_vector_sum(decsp, ractx->lpc_coef, ractx->lpc_coef_old,
block_num + 1, 3 - block_num, 0, 2, 30);
for (x=0; x<30; x++)
decsp[x] = (a * ractx->lpc_coef[x] + b * ractx->lpc_coef_old[x])>> 2;
if (eq(decsp, work)) {
// The interpolated coefficients are unstable, copy either new or old
// coefficients
if (copynew) {
memcpy(decsp, ractx->lpc_coef, 30*sizeof(*decsp));
return rms(ractx->lpc_refl, f);
} else {
memcpy(decsp, ractx->lpc_coef_old, 30*sizeof(*decsp));
return rms(ractx->lpc_refl_old, f);
}
if (copynew)
return dec1(decsp, ractx->lpc_refl, ractx->lpc_coef, f);
else
return dec1(decsp, ractx->lpc_refl_old, ractx->lpc_coef_old, f);
} else {
return rms(work, f);
}
@ -316,16 +320,14 @@ static int ra144_decode_frame(AVCodecContext * avctx,
const uint8_t * buf, int buf_size)
{
static const uint8_t sizes[10] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
RA144Context *ractx = avctx->priv_data;
unsigned int refl_rms[4];
uint16_t coef_table[3][30];
uint16_t *gbuf2[4] =
{coef_table[0], coef_table[1], coef_table[2], ractx->lpc_coef};
unsigned int c;
unsigned int gbuf1[4];
uint16_t gbuf2[4][30];
unsigned int a, c;
int i;
int16_t *data = vdata;
unsigned int energy;
RA144Context *ractx = avctx->priv_data;
GetBitContext gb;
if(buf_size < 20) {
@ -342,16 +344,16 @@ static int ra144_decode_frame(AVCodecContext * avctx,
do_voice(ractx->lpc_refl, ractx->lpc_coef);
energy = decodeval[get_bits(&gb, 5) << 1]; // Useless table entries?
a = t_sqrt(energy*ractx->old_energy) >> 12;
refl_rms[0] = dec2(ractx, gbuf2[0], 0, 0, ractx->old_energy);
refl_rms[1] = dec2(ractx, gbuf2[1], 1, energy > ractx->old_energy,
t_sqrt(energy*ractx->old_energy) >> 12);
refl_rms[2] = dec2(ractx, gbuf2[2], 2, 1, energy);
refl_rms[3] = rms(ractx->lpc_refl, energy);
gbuf1[0] = dec2(ractx, gbuf2[0], 0, 0, ractx->old_energy);
gbuf1[1] = dec2(ractx, gbuf2[1], 1, energy > ractx->old_energy, a);
gbuf1[2] = dec2(ractx, gbuf2[2], 2, 1, energy);
gbuf1[3] = dec1(gbuf2[3], ractx->lpc_refl, ractx->lpc_coef, energy);
/* do output */
for (c=0; c<4; c++) {
do_output_subblock(ractx, gbuf2[c], refl_rms[c], data, &gb);
do_output_subblock(ractx, gbuf2[c], gbuf1[c], data, &gb);
for (i=0; i<BLOCKSIZE; i++) {
*data = av_clip_int16(*data << 2);
@ -362,7 +364,7 @@ static int ra144_decode_frame(AVCodecContext * avctx,
ractx->old_energy = energy;
FFSWAP(unsigned int *, ractx->lpc_refl_old, ractx->lpc_refl);
FFSWAP(int16_t * , ractx->lpc_coef_old, ractx->lpc_coef);
FFSWAP(unsigned int *, ractx->lpc_coef_old, ractx->lpc_coef);
*data_size = 2*160;
return 20;