xenia-project/FFmpeg
1
0
Fork 0
mirror of https://github.com/xenia-project/FFmpeg.git synced 2024-11-28 22:10:34 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

mxfenc: explicitly truncate continuity count.

Browse Source 
The field is intended to overflow and have only its low 16bits stored.
This commit avoids the implicit truncation and clarifies that its
intended and not a bug

S326m section 7.6 ("Continuity count"):
> The continuity count word consists of 2 bytes allow-
> ing a number to be created by a modulo 65536
> counter (bits C15 to C0 in figure 7). The continuity
> count shall increment by 1 for each newly transmit-
> ted content package with the same SDTI source and
> destination addresses. The continuity count may
> be used to detect whether the content package
> sequence has been broken by an operation such as
> a routing switch.

Approved-by: Tjoppen
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-10-15 15:58:44 +02:00
parent 1fe45903b8
commit 3896cd11a1
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libavformat/mxfenc.c
View File

@ -1820,7 +1820,7 @@ static void mxf_write_system_item(AVFormatContext *s)
avio_w8(pb, 0x04); // content package rate
avio_w8(pb, 0x00); // content package type
avio_wb16(pb, 0x00); // channel handle
avio_wb16(pb, mxf->tc.start + frame); // continuity count
avio_wb16(pb, (mxf->tc.start + frame) & 0xFFFF); // continuity count, supposed to overflow
if (mxf->essence_container_count > 1)
avio_write(pb, multiple_desc_ul, 16);
else {