[FFmpeg-cvslog] avcodec/h264: finish previous slices before switching to single thread mode

[Michael Niedermayer]

ffmpeg | branch: release/2.4 | Michael Niedermayer <michaelni at gmx.at> | Tue Apr  7 02:47:36 2015 +0200| [7493c54ad075920721c2b80a9b0d86cf02f41f4a] | committer: Michael Niedermayer

avcodec/h264: finish previous slices before switching to single thread mode

Fixes null pointer dereference
Fixes Ticket4438

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit c4b2017ba66e1623da9f527704c61c86a6e74844)

Conflicts:

	libavcodec/h264.c
(cherry picked from commit 09cc7aee3f4d1bd1d7107d38520f782c62c14036)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7493c54ad075920721c2b80a9b0d86cf02f41f4a
---

 libavcodec/h264.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 7b5c506..704c089 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -1730,6 +1730,12 @@ again:
                     av_log(h->avctx, AV_LOG_ERROR, "decode_slice_header error\n");
                 h->ref_count[0] = h->ref_count[1] = h->list_count = 0;
             } else if (err == SLICE_SINGLETHREAD) {
+                if (context_count > 1) {
+                    ret = ff_h264_execute_decode_slices(h, context_count - 1);
+                    if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
+                        goto end;
+                    context_count = 0;
+                }
                 /* Slice could not be decoded in parallel mode, copy down
                  * NAL unit stuff to context 0 and restart. Note that
                  * rbsp_buffer is not transferred, but since we no longer