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jpegdec: actually search for and parse RSTn

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Fixes decoding of MJPEG files produced by some UVC Logitec web cameras,
such as "Notebook Pro" and "HD C910".

References:
http://trac.videolan.org/vlc/ticket/4215
http://ffmpeg.org/trac/ffmpeg/ticket/267

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Reviewed-by: Kostya <kostya.shishkov@gmail.com>
(cherry picked from commit 8c0fa61a9713a1306fca7997dd04d72ea1f060ea)
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Michael Niedermayer 2011-06-09 03:35:50 +02:00 committed by Reinhard Tartler
parent 394c3e78d5
commit feca20021c
1 changed files with 5 additions and 2 deletions
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7
libavcodec/mjpegdec.c
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@ -839,9 +839,12 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, i
}
}
if (s->restart_interval && !--s->restart_count) {
if (s->restart_interval && show_bits(&s->gb, 8) == 0xFF){ /* skip RSTn */
--s->restart_count;
align_get_bits(&s->gb);
skip_bits(&s->gb, 16); /* skip RSTn */
while(show_bits(&s->gb, 8) == 0xFF)
skip_bits(&s->gb, 8);
skip_bits(&s->gb, 8);
for (i=0; i<nb_components; i++) /* reset dc */
s->last_dc[i] = 1024;
}