This is the same as
https://patchwork.ffmpeg.org/project/ffmpeg/patch/20240607002549.2259139-1-owata...@es.takushoku-u.ac.jp/
Signed-off-by: Osamu Watanabe <owata...@es.takushoku-u.ac.jp>
---
libavcodec/jpeg2000dec.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index d299c67cc7..395cf34bcd 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1097,6 +1097,7 @@ static inline void select_header(Jpeg2000DecoderContext
*s, const Jpeg2000Tile *
{
s->g = tile->tile_part[*tp_index].header_tpg;
if (bytestream2_get_bytes_left(&s->g) == 0 && s->bit_index == 8) {
+ av_log(s->avctx, AV_LOG_WARNING, "Packet header bytes in PPM marker
segment is too short.\n");
if (*tp_index < FF_ARRAY_ELEMS(tile->tile_part) - 1) {
s->g = tile->tile_part[++(*tp_index)].tpg;
}
@@ -1106,10 +1107,18 @@ static inline void select_header(Jpeg2000DecoderContext
*s, const Jpeg2000Tile *
static inline void select_stream(Jpeg2000DecoderContext *s, const Jpeg2000Tile
*tile,
int *tp_index, const Jpeg2000CodingStyle
*codsty)
{
+ int32_t is_endof_tp;
+
s->g = tile->tile_part[*tp_index].tpg;
- if (bytestream2_get_bytes_left(&s->g) == 0 && s->bit_index == 8) {
+ is_endof_tp = bytestream2_get_bytes_left(&s->g) == 0 && s->bit_index == 8;
+ // Following while loop is necessary because a tilepart may include only
SOD marker.
+ // Such a tilepart has neither packet header nor compressed data.
+ while (is_endof_tp) {
if (*tp_index < FF_ARRAY_ELEMS(tile->tile_part) - 1) {
s->g = tile->tile_part[++(*tp_index)].tpg;
+ is_endof_tp = bytestream2_get_bytes_left(&s->g) == 0 &&
s->bit_index == 8;
+ } else {
+ is_endof_tp = 0;
}
}
if (codsty->csty & JPEG2000_CSTY_SOP) {
--
2.34.1
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