[FFmpeg-devel] [PATCH 2/2] Add another special case to the Cinepak video decoder so that it can handle the following file:
mike at multimedia.cx
mike at multimedia.cx
Wed Nov 16 08:06:48 CET 2011
From: Mike Melanson <mike at multimedia.cx>
http://samples.mplayerhq.hu/V-codecs/CVID/bad_cinepak_frame_size.mov
This fix works around another work around which handles a different type
of odd Cinepak data.
Thanks to Matthew Hoops (clone2727 - gmail.com) for the sample and fix.
---
libavcodec/cinepak.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/libavcodec/cinepak.c b/libavcodec/cinepak.c
index c5d47be..2eca87e 100644
--- a/libavcodec/cinepak.c
+++ b/libavcodec/cinepak.c
@@ -330,12 +330,13 @@ static int cinepak_decode (CinepakContext *s)
/* if this is the first frame, check for deviant Sega FILM data */
if (s->sega_film_skip_bytes == -1) {
- if (encoded_buf_size != s->size) {
+ if (encoded_buf_size != s->size && (s->size % encoded_buf_size) != 0) {
/* If the encoded frame size differs from the frame size as indicated
* by the container file, this data likely comes from a Sega FILM/CPK file.
* If the frame header is followed by the bytes FE 00 00 06 00 00 then
* this is probably one of the two known files that have 6 extra bytes
- * after the frame header. Else, assume 2 extra bytes. */
+ * after the frame header. Else, assume 2 extra bytes. The container size
+ * size also cannot be a multiple of the encoded size. */
if (s->size >= 16 &&
(s->data[10] == 0xFE) &&
(s->data[11] == 0x00) &&
--
1.7.4.1
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