[FFmpeg-cvslog] avformat/movenc: limit ISOBMFF AC-3 mapping to bsids <=8

[Jan Ekström]

ffmpeg | branch: master | Jan Ekström <jan.ekstrom at 24i.com> | Wed Jun 22 09:58:27 2022 +0300| [5eb8da6a81a11909d3908b47a9620096b8f3d654] | committer: Jan Ekström

avformat/movenc: limit ISOBMFF AC-3 mapping to bsids <=8

This leaves out RealAudio DolbyNet, which utilizes bsids 9 and 10,

It is not clear whether the interpreted bit rate value (divided by
2 or 4 depending on the variant), or the original bit rate value
should be utilized to receive the bit_rate_code index.

Signed-off-by: Jan Ekström <jan.ekstrom at 24i.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=5eb8da6a81a11909d3908b47a9620096b8f3d654
---

 libavformat/movenc.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index a942271beb..0ef6b3c76e 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -374,6 +374,14 @@ static int mov_write_ac3_tag(AVFormatContext *s, AVIOContext *pb, MOVTrack *trac
         return AVERROR(EINVAL);
     }
 
+    if (info->substream[0].bsid > 8) {
+        av_log(s, AV_LOG_ERROR,
+               "RealAudio AC-3/DolbyNet with bsid %d is not defined by the "
+               "ISOBMFF specification in ETSI TS 102 366!\n",
+               info->substream[0].bsid);
+        return AVERROR(EINVAL);
+    }
+
     if (info->ac3_bit_rate_code < 0) {
         av_log(s, AV_LOG_ERROR,
                "No valid AC3 bit rate code for data rate of %d!\n",