[FFmpeg-cvslog] avcodec/mjpegdec: Reinitialize IDCT on BPP changes

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michael at niedermayer.cc> | Wed Nov  4 21:27:04 2015 +0100| [5d9bee34f9ae5fae996defda0fd9ccd1ca2b1f9c] | committer: Michael Niedermayer

avcodec/mjpegdec: Reinitialize IDCT on BPP changes

Fixes misaligned access
Fixes: dc9262a469f6f315f74c087a7b3a7f35/signal_sigsegv_2e95bcd_9_9c0f9f4a9ba82aa9b3ab2b91ce4d5277.jpg

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit cc35f6f4768ffe57cc4fcfa56ecb89aee409e3d5)

Conflicts:

	libavcodec/mjpegdec.c
(cherry picked from commit f82c4777ee7a319fe2aa36f413a61943313b4abc)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5d9bee34f9ae5fae996defda0fd9ccd1ca2b1f9c
---

 libavcodec/mjpegdec.c |   19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 5cea6a6..59cbd25 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -96,6 +96,15 @@ static void parse_avid(MJpegDecodeContext *s, uint8_t *buf, int len)
         av_log(s->avctx, AV_LOG_INFO, "AVID: len:%d %d\n", len, len > 14 ? buf[12] : -1);
 }
 
+static void init_idct(AVCodecContext *avctx)
+{
+    MJpegDecodeContext *s = avctx->priv_data;
+
+    ff_idctdsp_init(&s->idsp, avctx);
+    ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
+                      ff_zigzag_direct);
+}
+
 av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
 {
     MJpegDecodeContext *s = avctx->priv_data;
@@ -110,9 +119,7 @@ av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
     s->avctx = avctx;
     ff_blockdsp_init(&s->bdsp, avctx);
     ff_hpeldsp_init(&s->hdsp, avctx->flags);
-    ff_idctdsp_init(&s->idsp, avctx);
-    ff_init_scantable(s->idsp.idct_permutation, &s->scantable,
-                      ff_zigzag_direct);
+    init_idct(avctx);
     s->buffer_size   = 0;
     s->buffer        = NULL;
     s->start_code    = -1;
@@ -254,9 +261,13 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
 
     /* XXX: verify len field validity */
     len     = get_bits(&s->gb, 16);
-    s->avctx->bits_per_raw_sample =
     bits    = get_bits(&s->gb, 8);
 
+    if (s->avctx->bits_per_raw_sample != bits) {
+        av_log(s->avctx, AV_LOG_INFO, "Changeing bps to %d\n", bits);
+        s->avctx->bits_per_raw_sample = bits;
+        init_idct(s->avctx);
+    }
     if (s->pegasus_rct)
         bits = 9;
     if (bits == 9 && !s->pegasus_rct)