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avcodec/exr: add support for scanline file where offsets are set to zero

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Dzung Hoang 2017-03-25 12:40:08 +01:00 committed by Paul B Mahol
parent 75afad774b
commit 68e3c9a3b6
1 changed files with 18 additions and 1 deletions
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19
libavcodec/exr.c
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@ -1647,7 +1647,10 @@ static int decode_frame(AVCodecContext *avctx, void *data,
int y, ret;
int out_line_size;
int nb_blocks;/* nb scanline or nb tile */
int nb_blocks; /* nb scanline or nb tile */
uint64_t *table; /* scanline offset table */
uint8_t *marker; /* used to recreate invalid scanline offset table */
uint8_t *head;
bytestream2_init(&s->gb, avpkt->data, avpkt->size);
@ -1733,6 +1736,20 @@ static int decode_frame(AVCodecContext *avctx, void *data,
if (bytestream2_get_bytes_left(&s->gb) < nb_blocks * 8)
return AVERROR_INVALIDDATA;
// check offset table and recreate it if need
if (!s->is_tile && bytestream2_peek_le64(&s->gb) == 0) {
head = avpkt->data;
table = (uint64_t *)s->gb.buffer;
marker = head + bytestream2_tell(&s->gb) + nb_blocks * 8;
av_log(s->avctx, AV_LOG_DEBUG, "recreating invalid scanline offset table\n");
for (y = 0; y < nb_blocks; y++) {
table[y] = marker - head;
marker += ((uint32_t *)marker)[1] + 8;
}
}
// save pointer we are going to use in decode_block
s->buf = avpkt->data;
s->buf_size = avpkt->size;