virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
Code Issues Releases Activity

Use lpc_coef[2] instead of lpc_coef and lpc_coef_old

Browse Source 
Originally committed as revision 13946 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-06-24 18:38:55 +00:00
parent ae70f874ba
commit 73cc419b27
1 changed files with 19 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
libavcodec/ra144.c
View File

@ -32,10 +32,12 @@ typedef struct {
unsigned int old_energy; ///< previous frame energy
unsigned int lpc_tables[2][10];
unsigned int *lpc_coef; ///< LPC coefficients
unsigned int *lpc_coef_old; ///< previous frame LPC coefficients
unsigned int lpc_refl_rms;
unsigned int lpc_refl_rms_old;
/** LPC coefficients: lpc_coef[0] is the coefficients of the current frame
* and lpc_coef[1] of the previous one */
unsigned int *lpc_coef[2];
unsigned int lpc_refl_rms[2];
/** the current subblock padded by the last 10 values of the previous one*/
int16_t curr_sblock[50];
@ -49,8 +51,8 @@ static int ra144_decode_init(AVCodecContext * avctx)
{
RA144Context *ractx = avctx->priv_data;
ractx->lpc_coef = ractx->lpc_tables[0];
ractx->lpc_coef_old = ractx->lpc_tables[1];
ractx->lpc_coef[0] = ractx->lpc_tables[0];
ractx->lpc_coef[1] = ractx->lpc_tables[1];
return 0;
}
@ -310,17 +312,17 @@ static int interp(RA144Context *ractx, int16_t *out, int block_num,
// Interpolate block coefficients from the this frame forth block and
// last frame forth block
for (x=0; x<30; x++)
out[x] = (a * ractx->lpc_coef[x] + b * ractx->lpc_coef_old[x])>> 2;
out[x] = (a * ractx->lpc_coef[0][x] + b * ractx->lpc_coef[1][x])>> 2;
if (eval_refl(work, out, ractx)) {
// The interpolated coefficients are unstable, copy either new or old
// coefficients
if (copynew) {
int_to_int16(out, ractx->lpc_coef);
return rescale_rms(ractx->lpc_refl_rms, energy);
int_to_int16(out, ractx->lpc_coef[0]);
return rescale_rms(ractx->lpc_refl_rms[0], energy);
} else {
int_to_int16(out, ractx->lpc_coef_old);
return rescale_rms(ractx->lpc_refl_rms_old, energy);
int_to_int16(out, ractx->lpc_coef[1]);
return rescale_rms(ractx->lpc_refl_rms[1], energy);
}
} else {
return rescale_rms(rms(work), energy);
@ -354,8 +356,8 @@ static int ra144_decode_frame(AVCodecContext * avctx,
for (i=0; i<10; i++)
lpc_refl[i] = lpc_refl_cb[i][get_bits(&gb, sizes[i])];
eval_coefs(ractx->lpc_coef, lpc_refl);
ractx->lpc_refl_rms = rms(lpc_refl);
eval_coefs(ractx->lpc_coef[0], lpc_refl);
ractx->lpc_refl_rms[0] = rms(lpc_refl);
energy = energy_tab[get_bits(&gb, 5)];
@ -363,9 +365,9 @@ static int ra144_decode_frame(AVCodecContext * avctx,
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] = rescale_rms(ractx->lpc_refl_rms, energy);
refl_rms[3] = rescale_rms(ractx->lpc_refl_rms[0], energy);
int_to_int16(block_coefs[3], ractx->lpc_coef);
int_to_int16(block_coefs[3], ractx->lpc_coef[0]);
for (c=0; c<4; c++) {
do_output_subblock(ractx, block_coefs[c], refl_rms[c], &gb);
@ -375,9 +377,9 @@ static int ra144_decode_frame(AVCodecContext * avctx,
}
ractx->old_energy = energy;
ractx->lpc_refl_rms_old = ractx->lpc_refl_rms;
ractx->lpc_refl_rms[1] = ractx->lpc_refl_rms[0];
FFSWAP(unsigned int *, ractx->lpc_coef_old, ractx->lpc_coef);
FFSWAP(unsigned int *, ractx->lpc_coef[0], ractx->lpc_coef[1]);
*data_size = 2*160;
return 20;