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qdm2: Conceal broken samples

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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Luca Barbato 2013-07-09 14:59:33 +02:00
parent adadc3f244
commit 4ecdb5ed44
1 changed files with 10 additions and 3 deletions
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13
libavcodec/qdm2.c
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@ -525,8 +525,8 @@ static void build_sb_samples_from_noise(QDM2Context *q, int sb)
* @param channels number of channels * @param channels number of channels
* @param coding_method q->coding_method[0][0][0] * @param coding_method q->coding_method[0][0][0]
*/ */
static void fix_coding_method_array(int sb, int channels, static int fix_coding_method_array(int sb, int channels,
sb_int8_array coding_method) sb_int8_array coding_method)
{ {
int j, k; int j, k;
int ch; int ch;
@ -534,6 +534,8 @@ static void fix_coding_method_array(int sb, int channels,
for (ch = 0; ch < channels; ch++) { for (ch = 0; ch < channels; ch++) {
for (j = 0; j < 64; ) { for (j = 0; j < 64; ) {
if (coding_method[ch][sb][j] < 8)
return -1;
if ((coding_method[ch][sb][j] - 8) > 22) { if ((coding_method[ch][sb][j] - 8) > 22) {
run = 1; run = 1;
case_val = 8; case_val = 8;
@ -579,6 +581,7 @@ static void fix_coding_method_array(int sb, int channels,
j += run; j += run;
} }
} }
return 0;
} }
/** /**
@ -840,7 +843,11 @@ static void synthfilt_build_sb_samples(QDM2Context *q, GetBitContext *gb,
if (q->coding_method[1][sb][j] > q->coding_method[0][sb][j]) if (q->coding_method[1][sb][j] > q->coding_method[0][sb][j])
q->coding_method[0][sb][j] = q->coding_method[1][sb][j]; q->coding_method[0][sb][j] = q->coding_method[1][sb][j];
fix_coding_method_array(sb, q->nb_channels, q->coding_method); if (fix_coding_method_array(sb, q->nb_channels,
q->coding_method)) {
build_sb_samples_from_noise(q, sb);
continue;
}
channels = 1; channels = 1;
} }