[FFmpeg-cvslog] mjpegdec: support AVRn interlaced
Michael Niedermayer
git at videolan.org
Fri Aug 10 15:56:35 CEST 2012
ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Fri Aug 10 15:47:07 2012 +0200| [d9d0c1ccc3df39fecbbbb6b600c18542741c5a51] | committer: Michael Niedermayer
mjpegdec: support AVRn interlaced
Fixes Ticket1527
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d9d0c1ccc3df39fecbbbb6b600c18542741c5a51
---
libavcodec/mjpegdec.c | 19 ++++++++++++++++---
1 file changed, 16 insertions(+), 3 deletions(-)
diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 37e5fd6..4fb2f3e 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -1209,9 +1209,6 @@ int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
}else
prev_shift = point_transform = 0;
- for (i = 0; i < nb_components; i++)
- s->last_dc[i] = 1024;
-
if (nb_components > 1) {
/* interleaved stream */
s->mb_width = (s->width + s->h_max * block_size - 1) / (s->h_max * block_size);
@@ -1236,6 +1233,9 @@ int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
/* mjpeg-b can have padding bytes between sos and image data, skip them */
for (i = s->mjpb_skiptosod; i > 0; i--)
skip_bits(&s->gb, 8);
+next_field:
+ for (i = 0; i < nb_components; i++)
+ s->last_dc[i] = 1024;
if (s->lossless) {
av_assert0(s->picture_ptr == &s->picture);
@@ -1266,6 +1266,19 @@ int ff_mjpeg_decode_sos(MJpegDecodeContext *s, const uint8_t *mb_bitmask,
return -1;
}
}
+ if(s->interlaced && get_bits_left(&s->gb) > 32 && show_bits(&s->gb, 8) == 0xFF) {
+ GetBitContext bak= s->gb;
+ align_get_bits(&bak);
+ if(show_bits(&bak, 16) == 0xFFD1) {
+ av_log(s->avctx, AV_LOG_DEBUG, "AVRn ingterlaced picture\n");
+ s->gb = bak;
+ skip_bits(&s->gb, 16);
+ s->bottom_field ^= 1;
+
+ goto next_field;
+ }
+ }
+
emms_c();
return 0;
out_of_range:
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