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Code Issues Releases Activity

wmavoice: conceal clearly corrupted blocks

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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Luca Barbato 2013-06-29 05:29:54 +02:00
parent f5c48f5ada
commit d14a26edb7
1 changed files with 17 additions and 4 deletions
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19
libavcodec/wmavoice.c
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@ -1052,8 +1052,9 @@ static void aw_parse_coords(WMAVoiceContext *s, GetBitContext *gb,
* @param gb bit I/O context
* @param block_idx block index in frame [0, 1]
* @param fcb structure containing fixed codebook vector info
* @return -1 on error, 0 otherwise
*/
static void aw_pulse_set2(WMAVoiceContext *s, GetBitContext *gb,
static int aw_pulse_set2(WMAVoiceContext *s, GetBitContext *gb,
int block_idx, AMRFixed *fcb)
{
uint16_t use_mask_mem[9]; // only 5 are used, rest is padding
@ -1116,7 +1117,7 @@ static void aw_pulse_set2(WMAVoiceContext *s, GetBitContext *gb,
else if (use_mask[2]) idx = 0x2F;
else if (use_mask[3]) idx = 0x3F;
else if (use_mask[4]) idx = 0x4F;
else return;
else return -1;
idx -= av_log2_16bit(use_mask[idx >> 4]);
}
if (use_mask[idx >> 4] & (0x8000 >> (idx & 15))) {
@ -1133,6 +1134,7 @@ static void aw_pulse_set2(WMAVoiceContext *s, GetBitContext *gb,
/* set offset for next block, relative to start of that block */
n = (MAX_FRAMESIZE / 2 - start_off) % fcb->pitch_lag;
s->aw_next_pulse_off_cache = n ? fcb->pitch_lag - n : 0;
return 0;
}
/**
@ -1295,7 +1297,18 @@ static void synth_block_fcb_acb(WMAVoiceContext *s, GetBitContext *gb,
* (fixed) codebook pulses of the speech signal. */
if (frame_desc->fcb_type == FCB_TYPE_AW_PULSES) {
aw_pulse_set1(s, gb, block_idx, &fcb);
aw_pulse_set2(s, gb, block_idx, &fcb);
if (aw_pulse_set2(s, gb, block_idx, &fcb)) {
/* Conceal the block with silence and return.
* Skip the correct amount of bits to read the next
* block from the correct offset. */
int r_idx = pRNG(s->frame_cntr, block_idx, size);
for (n = 0; n < size; n++)
excitation[n] =
wmavoice_std_codebook[r_idx + n] * s->silence_gain;
skip_bits(gb, 7 + 1);
return;
}
} else /* FCB_TYPE_EXC_PULSES */ {
int offset_nbits = 5 - frame_desc->log_n_blocks;