Updating Opus to a pre-release of 1.1
This CL updates Opus to a pre-release of the coming Opus 1.1 version. The code is extracted from http://git.xiph.org/?p=opus.git, commit aee4d8057632ea0cfc1d55d88acf8466b47b7b4b from October 1st 2013.
This version includes both algorithmic and platform optimizations, as well an important fix for a denorm problem when the input goes silent after active audio. The problem causes high CPU usage.
Review URL: https://codereview.chromium.org/28553003
git-svn-id: svn://svn.chromium.org/chrome/trunk/deps/third_party/opus@230378 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/celt/quant_bands.c b/celt/quant_bands.c
index 66f1f5f..79685e1 100644
--- a/celt/quant_bands.c
+++ b/celt/quant_bands.c
@@ -40,8 +40,8 @@
#include "rate.h"
#ifdef FIXED_POINT
-/* Mean energy in each band quantized in Q6 */
-static const signed char eMeans[25] = {
+/* Mean energy in each band quantized in Q4 */
+const signed char eMeans[25] = {
103,100, 92, 85, 81,
77, 72, 70, 78, 75,
73, 71, 78, 74, 69,
@@ -49,8 +49,8 @@
60, 60, 60, 60, 60
};
#else
-/* Mean energy in each band quantized in Q6 and converted back to float */
-static const opus_val16 eMeans[25] = {
+/* Mean energy in each band quantized in Q4 and converted back to float */
+const opus_val16 eMeans[25] = {
6.437500f, 6.250000f, 5.750000f, 5.312500f, 5.062500f,
4.812500f, 4.500000f, 4.375000f, 4.875000f, 4.687500f,
4.562500f, 4.437500f, 4.875000f, 4.625000f, 4.312500f,
@@ -157,7 +157,7 @@
const opus_val16 *eBands, opus_val16 *oldEBands,
opus_int32 budget, opus_int32 tell,
const unsigned char *prob_model, opus_val16 *error, ec_enc *enc,
- int C, int LM, int intra, opus_val16 max_decay)
+ int C, int LM, int intra, opus_val16 max_decay, int lfe)
{
int i, c;
int badness = 0;
@@ -222,6 +222,8 @@
if (bits_left < 16)
qi = IMAX(-1, qi);
}
+ if (lfe && i>=2)
+ qi = IMIN(qi, 0);
if (budget-tell >= 15)
{
int pi;
@@ -253,13 +255,13 @@
prev[c] = prev[c] + SHL32(q,7) - MULT16_16(beta,PSHR32(q,8));
} while (++c < C);
}
- return badness;
+ return lfe ? 0 : badness;
}
void quant_coarse_energy(const CELTMode *m, int start, int end, int effEnd,
const opus_val16 *eBands, opus_val16 *oldEBands, opus_uint32 budget,
opus_val16 *error, ec_enc *enc, int C, int LM, int nbAvailableBytes,
- int force_intra, opus_val32 *delayedIntra, int two_pass, int loss_rate)
+ int force_intra, opus_val32 *delayedIntra, int two_pass, int loss_rate, int lfe)
{
int intra;
opus_val16 max_decay;
@@ -280,9 +282,6 @@
if (tell+3 > budget)
two_pass = intra = 0;
- /* Encode the global flags using a simple probability model
- (first symbols in the stream) */
-
max_decay = QCONST16(16.f,DB_SHIFT);
if (end-start>10)
{
@@ -292,6 +291,8 @@
max_decay = MIN32(max_decay, .125f*nbAvailableBytes);
#endif
}
+ if (lfe)
+ max_decay=3;
enc_start_state = *enc;
ALLOC(oldEBands_intra, C*m->nbEBands, opus_val16);
@@ -301,7 +302,7 @@
if (two_pass || intra)
{
badness1 = quant_coarse_energy_impl(m, start, end, eBands, oldEBands_intra, budget,
- tell, e_prob_model[LM][1], error_intra, enc, C, LM, 1, max_decay);
+ tell, e_prob_model[LM][1], error_intra, enc, C, LM, 1, max_decay, lfe);
}
if (!intra)
@@ -328,7 +329,7 @@
*enc = enc_start_state;
badness2 = quant_coarse_energy_impl(m, start, end, eBands, oldEBands, budget,
- tell, e_prob_model[LM][intra], error, enc, C, LM, 0, max_decay);
+ tell, e_prob_model[LM][intra], error, enc, C, LM, 0, max_decay, lfe);
if (two_pass && (badness1 < badness2 || (badness1 == badness2 && ((opus_int32)ec_tell_frac(enc))+intra_bias > tell_intra)))
{
@@ -535,25 +536,6 @@
}
}
-void log2Amp(const CELTMode *m, int start, int end,
- celt_ener *eBands, const opus_val16 *oldEBands, int C)
-{
- int c, i;
- c=0;
- do {
- for (i=0;i<start;i++)
- eBands[i+c*m->nbEBands] = 0;
- for (;i<end;i++)
- {
- opus_val16 lg = ADD16(oldEBands[i+c*m->nbEBands],
- SHL16((opus_val16)eMeans[i],6));
- eBands[i+c*m->nbEBands] = PSHR32(celt_exp2(lg),4);
- }
- for (;i<m->nbEBands;i++)
- eBands[i+c*m->nbEBands] = 0;
- } while (++c < C);
-}
-
void amp2Log2(const CELTMode *m, int effEnd, int end,
celt_ener *bandE, opus_val16 *bandLogE, int C)
{