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Makes bandwidth detection less aggressive.

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The original code was causing parts of a sine sweep to be completely dropped
due to the 300 Hz margin and the hysteresis. Also, fixes scaling for the
analysis downmix when the input is 16-bit PCM.
This commit is contained in:
Jean-Marc Valin 2013-03-12 11:24:53 -04:00
parent f982b84d1e
commit c5e04e4aa4
2 changed files with 7 additions and 5 deletions
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10
src/analysis.c
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@ -376,8 +376,8 @@ void tonality_analysis(TonalityAnalysisState *tonal, AnalysisInfo *info_out, con
float E=0;
int band_start, band_end;
/* Keep a margin of 300 Hz for aliasing */
band_start = extra_bands[b]+3;
band_end = extra_bands[b+1]+3;
band_start = extra_bands[b];
band_end = extra_bands[b+1];
for (i=band_start;i<band_end;i++)
{
float binE = out[i].r*out[i].r + out[N-i].r*out[N-i].r
@ -569,11 +569,11 @@ void tonality_analysis(TonalityAnalysisState *tonal, AnalysisInfo *info_out, con
printf("%f ", features[i]);
printf("\n");*/
if (bandwidth<=12 || (bandwidth==13 && tonal->opus_bandwidth == OPUS_BANDWIDTH_NARROWBAND))
if (bandwidth<=12)
tonal->opus_bandwidth = OPUS_BANDWIDTH_NARROWBAND;
else if (bandwidth<=14 || (bandwidth==15 && tonal->opus_bandwidth == OPUS_BANDWIDTH_MEDIUMBAND))
else if (bandwidth<=14)
tonal->opus_bandwidth = OPUS_BANDWIDTH_MEDIUMBAND;
else if (bandwidth<=16 || (bandwidth==17 && tonal->opus_bandwidth == OPUS_BANDWIDTH_WIDEBAND))
else if (bandwidth<=16)
tonal->opus_bandwidth = OPUS_BANDWIDTH_WIDEBAND;
else if (bandwidth<=18)
tonal->opus_bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND;

2
src/opus_encoder.c
View file

@ -695,6 +695,8 @@ void downmix_int(const void *_x, float *sub, int subframe, int offset, int C)
for (c=1;c<C;c++)
for (j=0;j<subframe;j++)
sub[j] += x[(j+offset)*C+c];
for (j=0;j<subframe;j++)
sub[j] *= (1.f/32768);
}
int optimize_framesize(const opus_val16 *x, int len, int C, opus_int32 Fs,