eden-emu/opus
19
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Decision on whether to use pitch is now taken only based on energy in the

Browse source 
first three bands (instead of total MDCT window energy)
This commit is contained in:
Jean-Marc Valin 2008-03-26 08:10:27 +11:00
parent d9584dbafc
commit bd2828f64b
4 changed files with 15 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

19
libcelt/celt.c
View file

@ -153,10 +153,9 @@ static inline celt_int16_t SIG2INT16(celt_sig_t x)
}
/** Apply window and compute the MDCT for all sub-frames and all channels in a frame */
static celt_word32_t compute_mdcts(const mdct_lookup *lookup, const celt_word16_t * restrict window, celt_sig_t * restrict in, celt_sig_t * restrict out, int N, int overlap, int C)
static void compute_mdcts(const mdct_lookup *lookup, const celt_word16_t * restrict window, celt_sig_t * restrict in, celt_sig_t * restrict out, int N, int overlap, int C)
{
int c, N4;
celt_word32_t E = 0;
VARDECL(celt_word32_t, x);
VARDECL(celt_word32_t, tmp);
SAVE_STACK;
@ -183,15 +182,12 @@ static celt_word32_t compute_mdcts(const mdct_lookup *lookup, const celt_word16_
x[j] = 0;
x[2*N-j-1] = 0;
}
for (j=0;j<2*N;j++)
E += MULT16_16(EXTRACT16(SHR32(x[j],SIG_SHIFT+4)),EXTRACT16(SHR32(x[j],SIG_SHIFT+4)));
mdct_forward(lookup, x, tmp);
/* Interleaving the sub-frames */
for (j=0;j<N;j++)
out[C*j+c] = tmp[j];
}
RESTORE_STACK;
return E;
}
/** Compute the IMDCT and apply window for all sub-frames and all channels in a frame */
@ -266,7 +262,7 @@ int EXPORT celt_encode(CELTEncoder *st, celt_int16_t *pcm, unsigned char *compre
/*for (i=0;i<(B+1)*C*N;i++) printf ("%f(%d) ", in[i], i); printf ("\n");*/
/* Compute MDCTs */
curr_power = compute_mdcts(&st->mode->mdct, st->mode->window, in, freq, N, st->overlap, C);
compute_mdcts(&st->mode->mdct, st->mode->window, in, freq, N, st->overlap, C);
#if 0 /* Mask disabled until it can be made to do something useful */
compute_mdct_masking(X, mask, B*C*N, st->Fs);
@ -299,7 +295,7 @@ int EXPORT celt_encode(CELTEncoder *st, celt_int16_t *pcm, unsigned char *compre
/*for (i=0;i<N*B*C;i++)printf("%f ", X[i]);printf("\n");*/
/* Compute MDCTs of the pitch part */
pitch_power = compute_mdcts(&st->mode->mdct, st->mode->window, st->out_mem+pitch_index*C, freq, N, st->overlap, C);
compute_mdcts(&st->mode->mdct, st->mode->window, st->out_mem+pitch_index*C, freq, N, st->overlap, C);
quant_energy(st->mode, bandE, st->oldBandE, nbCompressedBytes*8/3, &st->enc);
@ -309,15 +305,18 @@ int EXPORT celt_encode(CELTEncoder *st, celt_int16_t *pcm, unsigned char *compre
stereo_mix(st->mode, X, bandE, 1);
}
/* Check if we can safely use the pitch (i.e. effective gain isn't too high) */
if (MULT16_32_Q15(QCONST16(.1f, 15),curr_power) + SHR16(10000,8) < pitch_power)
{
/* Normalise the pitch vector as well (discard the energies) */
VARDECL(celt_ener_t, bandEp);
ALLOC(bandEp, st->mode->nbEBands*st->mode->nbChannels, celt_ener_t);
compute_band_energies(st->mode, freq, bandEp);
normalise_bands(st->mode, freq, P, bandEp);
pitch_power = bandEp[0]+bandEp[1]+bandEp[2];
}
curr_power = bandE[0]+bandE[1]+bandE[2];
/* Check if we can safely use the pitch (i.e. effective gain isn't too high) */
if (MULT16_32_Q15(QCONST16(.1f, 15),curr_power) + QCONST32(10.f,ENER_SHIFT) < pitch_power)
{
if (C==2)
stereo_mix(st->mode, P, bandE, 1);
/* Simulates intensity stereo */