[FFmpeg-cvslog] lavf/img2dec: Improve jpeg auto-detection.
Carl Eugen Hoyos
git at videolan.org
Sat Sep 12 19:01:23 CEST 2015
ffmpeg | branch: master | Carl Eugen Hoyos <cehoyos at ag.or.at> | Sat Sep 12 19:00:02 2015 +0200| [e3e55758dcf6e7801e9402df2cb734c19d0ea314] | committer: Carl Eugen Hoyos
lavf/img2dec: Improve jpeg auto-detection.
Fixes ticket #4841.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e3e55758dcf6e7801e9402df2cb734c19d0ea314
---
libavformat/img2dec.c | 26 ++++++++++++++++++++------
1 file changed, 20 insertions(+), 6 deletions(-)
diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
index cf848ce..70f0b09 100644
--- a/libavformat/img2dec.c
+++ b/libavformat/img2dec.c
@@ -660,18 +660,14 @@ static int j2k_probe(AVProbeData *p)
static int jpeg_probe(AVProbeData *p)
{
const uint8_t *b = p->buf;
- int i, state = 0xD8, exif_size = 0;
+ int i, state = 0xD8;
if (AV_RB16(b) != 0xFFD8 ||
AV_RB32(b) == 0xFFD8FFF7)
return 0;
b += 2;
- if (AV_RB16(b) == 0xFFE1 && AV_RB32(b + 4) == AV_RB32("Exif")) {
- exif_size = AV_RB16(b + 2) + 2;
- b += exif_size;
- }
- for (i = 0; i + exif_size < p->buf_size - 2; i++) {
+ for (i = 0; i < p->buf_size - 3; i++) {
int c;
if (b[i] != 0xFF)
continue;
@@ -700,6 +696,24 @@ static int jpeg_probe(AVProbeData *p)
return 0;
state = 0xD9;
break;
+ case 0xE0:
+ case 0xE1:
+ case 0xE2:
+ case 0xE3:
+ case 0xE4:
+ case 0xE5:
+ case 0xE6:
+ case 0xE7:
+ case 0xE8:
+ case 0xE9:
+ case 0xEA:
+ case 0xEB:
+ case 0xEC:
+ case 0xED:
+ case 0xEE:
+ case 0xEF:
+ i += AV_RB16(&b[i + 2]) + 1;
+ break;
default:
if ( (c >= 0x02 && c <= 0xBF)
|| c == 0xC8)
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