avformat/(mpeg|mpegts|mxf|sup)enc: Use const uint8_t* to access pkt data

The packets muxers receive are not guaranteed to be writable,
so they must not be modified. Ergo only access the packet's data
via a const uint8_t*.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/libavformat/mxfenc.c b/libavformat/mxfenc.c
index 7041659143..2d08dd6d40 100644
--- a/libavformat/mxfenc.c
+++ b/libavformat/mxfenc.c
@@ -2806,8 +2806,8 @@ static void mxf_write_d10_audio_packet(AVFormatContext *s, AVStream *st, AVPacke
     MXFContext *mxf = s->priv_data;
     AVIOContext *pb = s->pb;
     int frame_size = pkt->size / st->codecpar->block_align;
-    uint8_t *samples = pkt->data;
-    uint8_t *end = pkt->data + pkt->size;
+    const uint8_t *samples = pkt->data;
+    const uint8_t *const end = pkt->data + pkt->size;
     int i;
 
     klv_encode_ber4_length(pb, 4 + frame_size*4*8);