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Code Issues Releases Activity

avcodec/movtextdec: Add support for large boxes(>32 bit)

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Signed-off-by: Niklesh <niklesh.lalwani@iitb.ac.in>
This commit is contained in:
Niklesh
2015-05-21 21:25:39 +05:30
committed by Philip Langdale
parent 3b176af001
commit 337aa17e61
1 changed files with 15 additions and 4 deletions
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19
libavcodec/movtextdec.c
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@@ -96,12 +96,13 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
char *ptr = avpkt->data;
char *end;
//char *ptr_temp;
int text_length, tsmb_type, style_entries, tsmb_size, tracksize;
int text_length, tsmb_type, style_entries;
uint64_t tsmb_size, tracksize;
int **style_start = {0,};
int **style_end = {0,};
int **style_flags = {0,};
const uint8_t *tsmb;
int index, i;
int index, i, size_var;
int *flag;
int *style_pos;
@@ -147,17 +148,27 @@ static int mov_text_decode_frame(AVCodecContext *avctx,
tsmb_type = AV_RB32(tsmb);
tsmb += 4;
if (tsmb_size == 1) {
if (tracksize + 16 > avpkt->size)
break;
tsmb_size = AV_RB64(tsmb);
tsmb += 8;
size_var = 18;
} else
size_var = 10;
//size_var is equal to 10 or 18 depending on the size of box
if (tracksize + tsmb_size > avpkt->size)
break;
if (tsmb_type == MKBETAG('s','t','y','l')) {
if (tracksize + 10 > avpkt->size)
if (tracksize + size_var > avpkt->size)
break;
style_entries = AV_RB16(tsmb);
tsmb += 2;
// A single style record is of length 12 bytes.
if (tracksize + 10 + style_entries * 12 > avpkt->size)
if (tracksize + size_var + style_entries * 12 > avpkt->size)
break;
for(i = 0; i < style_entries; i++) {