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Further simplifications to mix_pitch_and_residual() (which no longer does

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anything that its name implies)
This commit is contained in:
Jean-Marc Valin 2009-10-06 20:08:49 -04:00
parent 8861955d86
commit f6dc1eba26
1 changed files with 14 additions and 27 deletions
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41
libcelt/vq.c
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@ -99,39 +99,19 @@ static void exp_rotation(celt_norm_t *X, int len, int dir, int stride, int K)
/** Takes the pitch vector and the decoded residual vector, computes the gain
that will give ||p+g*y||=1 and mixes the residual with the pitch. */
static void mix_pitch_and_residual(int * restrict iy, celt_norm_t * restrict X, int N, int K)
static void mix_pitch_and_residual(int * restrict iy, celt_norm_t * restrict X, int N, int K, celt_word32_t Ryy)
{
int i;
celt_word32_t Ryy;
celt_word32_t g;
VARDECL(celt_norm_t, y);
#ifdef FIXED_POINT
int yshift;
#endif
SAVE_STACK;
#ifdef FIXED_POINT
yshift = 13-celt_ilog2(K);
#endif
ALLOC(y, N, celt_norm_t);
g = celt_rsqrt(Ryy);
i=0;
Ryy = 0;
do {
y[i] = SHL16(iy[i],yshift);
Ryy = MAC16_16(Ryy, y[i], y[i]);
} while (++i < N);
g = MULT16_32_Q15(celt_sqrt(Ryy), celt_rcp(SHR32(Ryy,9)));
i=0;
do
X[i] = ROUND16(MULT16_16(y[i], g),11);
do
X[i] = MULT16_32_P15(g, SHL32(EXTEND32(iy[i]),14));
while (++i < N);
RESTORE_STACK;
}
void alg_quant(celt_norm_t *X, int N, int K, int spread, ec_enc *enc)
{
VARDECL(celt_norm_t, y);
@ -290,7 +270,7 @@ void alg_quant(celt_norm_t *X, int N, int K, int spread, ec_enc *enc)
/* Recompute the gain in one pass to reduce the encoder-decoder mismatch
due to the recursive computation used in quantisation. */
mix_pitch_and_residual(iy, X, N, K);
mix_pitch_and_residual(iy, X, N, K, EXTRACT16(SHR32(yy,2*yshift)));
if (spread)
exp_rotation(X, N, -1, spread, K);
RESTORE_STACK;
@ -301,12 +281,19 @@ void alg_quant(celt_norm_t *X, int N, int K, int spread, ec_enc *enc)
the final normalised signal in the current band. */
void alg_unquant(celt_norm_t *X, int N, int K, int spread, ec_dec *dec)
{
int i;
celt_word32_t Ryy;
VARDECL(int, iy);
SAVE_STACK;
K = get_pulses(K);
ALLOC(iy, N, int);
decode_pulses(iy, N, K, dec);
mix_pitch_and_residual(iy, X, N, K);
Ryy = 0;
i=0;
do {
Ryy = MAC16_16(Ryy, iy[i], iy[i]);
} while (++i < N);
mix_pitch_and_residual(iy, X, N, K, Ryy);
if (spread)
exp_rotation(X, N, -1, spread, K);
RESTORE_STACK;