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Rename two context buffers: pr{1,2} -> {sp,gain}_lpc. Also add a few doxy

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Originally committed as revision 14437 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-07-27 20:58:29 +00:00
parent b211d3ae47
commit 0143ec2a7e
1 changed files with 16 additions and 15 deletions
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31
libavcodec/ra288.c
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@ -27,8 +27,8 @@
typedef struct {
float history[8];
float output[40];
float pr1[36];
float pr2[10];
float sp_lpc[36]; ///< LPC coefficients for speech data (spec: A)
float gain_lpc[10]; ///< LPC coefficients for gain (spec: GB)
int phase;
float sp_hist[111]; ///< Speech data history (spec: SB)
@ -72,10 +72,11 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
memmove(ractx->sb + 5, ractx->sb, 36 * sizeof(*ractx->sb));
for (x=4; x >= 0; x--)
ractx->sb[x] = -scalar_product_float(ractx->sb + x + 1, ractx->pr1, 36);
ractx->sb[x] = -scalar_product_float(ractx->sb + x + 1,
ractx->sp_lpc, 36);
/* convert log and do rms */
sum = 32. - scalar_product_float(ractx->pr2, ractx->lhist, 10);
sum = 32. - scalar_product_float(ractx->gain_lpc, ractx->lhist, 10);
sum = av_clipf(sum, 0, 60);
@ -95,7 +96,7 @@ static void decode(RA288Context *ractx, float gain, int cb_coef)
for (x=1; x < 5; x++)
for (y=x-1; y >= 0; y--)
buffer[x] -= ractx->pr1[x-y-1] * buffer[y];
buffer[x] -= ractx->sp_lpc[x-y-1] * buffer[y];
/* output */
for (x=0; x < 5; x++) {
@ -195,20 +196,20 @@ static void do_hybrid_window(int order, int n, int non_rec, const float *in,
*/
static void backward_filter(RA288Context *ractx)
{
float temp1[37];
float temp2[11];
float temp1[37]; // RTMP in the spec
float temp2[11]; // GPTPMP in the spec
do_hybrid_window(36, 40, 35, ractx->output, temp1, ractx->sp_hist, ractx->sp_rec,
syn_window);
do_hybrid_window(36, 40, 35, ractx->output, temp1, ractx->sp_hist,
ractx->sp_rec, syn_window);
if (!eval_lpc_coeffs(temp1, ractx->pr1, 36))
colmult(ractx->pr1, ractx->pr1, syn_bw_tab, 36);
if (!eval_lpc_coeffs(temp1, ractx->sp_lpc, 36))
colmult(ractx->sp_lpc, ractx->sp_lpc, syn_bw_tab, 36);
do_hybrid_window(10, 8, 20, ractx->history, temp2, ractx->gain_hist, ractx->gain_rec,
gain_window);
do_hybrid_window(10, 8, 20, ractx->history, temp2, ractx->gain_hist,
ractx->gain_rec, gain_window);
if (!eval_lpc_coeffs(temp2, ractx->pr2, 10))
colmult(ractx->pr2, ractx->pr2, gain_bw_tab, 10);
if (!eval_lpc_coeffs(temp2, ractx->gain_lpc, 10))
colmult(ractx->gain_lpc, ractx->gain_lpc, gain_bw_tab, 10);
}
/* Decode a block (celp) */