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aacsbr: Check for envelope scalefactors overflowing

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This prevents various values from becoming stuck at NAN and
output to become silent
If someone knows a cleaner solution, thats welcome!

Fixes Ticket2335

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-03-08 14:00:22 +01:00
parent 199db97fbd
commit 8978c743fb
1 changed files with 19 additions and 3 deletions
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22
libavcodec/aacsbr.c
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@ -1132,7 +1132,12 @@ static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
float fac = temp1 / (1.0f + temp2);
float fac;
if (temp1 > 1E20) {
av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
temp1 = 1;
}
fac = temp1 / (1.0f + temp2);
sbr->data[0].env_facs[e][k] = fac;
sbr->data[1].env_facs[e][k] = fac * temp2;
}
@ -1141,7 +1146,12 @@ static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
for (k = 0; k < sbr->n_q; k++) {
float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
float fac = temp1 / (1.0f + temp2);
float fac;
if (temp1 > 1E20) {
av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
temp1 = 1;
}
fac = temp1 / (1.0f + temp2);
sbr->data[0].noise_facs[e][k] = fac;
sbr->data[1].noise_facs[e][k] = fac * temp2;
}
@ -1150,9 +1160,15 @@ static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
for (e = 1; e <= sbr->data[ch].bs_num_env; e++)
for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++){
sbr->data[ch].env_facs[e][k] =
exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
if (sbr->data[ch].env_facs[e][k] > 1E20) {
av_log(NULL, AV_LOG_ERROR, "envelope scalefactor overflow in dequant\n");
sbr->data[ch].env_facs[e][k] = 1;
}
}
for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
for (k = 0; k < sbr->n_q; k++)
sbr->data[ch].noise_facs[e][k] =