[FFmpeg-cvslog] wmaprodec: require block_align to be set.

[Anton Khirnov]

ffmpeg | branch: release/0.7 | Anton Khirnov <anton at khirnov.net> | Wed Mar  6 09:58:00 2013 +0100| [280998b13cb8f8c8f771fbdf9257c6a8694577da] | committer: Reinhard Tartler

wmaprodec: require block_align to be set.

Avoids an infinite loop in the calling programs with decoder not
consuming any input and not returning output.

CC:libav-stable at libav.org
(cherry picked from commit cacad1c058f66558ec727faac3b277d2dee264d4)

Signed-off-by: Reinhard Tartler <siretart at tauware.de>
(cherry picked from commit 20373a66ec68d958c266f643a7d0e5ec254c0fcc)

Signed-off-by: Reinhard Tartler <siretart at tauware.de>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=280998b13cb8f8c8f771fbdf9257c6a8694577da
---

 libavcodec/wmaprodec.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index 2dfdde7..3c21d53 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -277,6 +277,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
     int log2_max_num_subframes;
     int num_possible_block_sizes;
 
+    if (!avctx->block_align) {
+        av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
+        return AVERROR(EINVAL);
+    }
+
     s->avctx = avctx;
     dsputil_init(&s->dsp, avctx);
     init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);