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-rw-r--r--ext/mpeg2enc/gstmpeg2encstreamwriter.cc9
1 files changed, 7 insertions, 2 deletions
diff --git a/ext/mpeg2enc/gstmpeg2encstreamwriter.cc b/ext/mpeg2enc/gstmpeg2encstreamwriter.cc
index 50c70cdf..ba59f3d4 100644
--- a/ext/mpeg2enc/gstmpeg2encstreamwriter.cc
+++ b/ext/mpeg2enc/gstmpeg2encstreamwriter.cc
@@ -47,8 +47,13 @@ void
GstMpeg2EncStreamWriter::PutBits (guint32 val,
gint n)
{
- /* only relevant bits */
- val &= ~(0xffffffffU << n);
+ /* only relevant bits. Note that (according to Andrew),
+ * some CPUs do bitshifts modulo wordsize (32), which
+ * means that we have to check for n != 32 before
+ * bitshifting to the relevant bits (i.e. 0xffffffff <<
+ * 32 == 0xffffffff). */
+ if (n != 32)
+ val &= ~(0xffffffffU << n);
/* write data */
while (n >= outcnt) {