[FFmpeg-cvslog] truehd_core: Disable 16-channel presentation

Andreas Rheinhardt git at videolan.org
Tue Jul 9 14:59:48 EEST 2019


ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Sat Jul  6 15:59:06 2019 +0200| [99c191151a716d8315e938297bd9b50a6a0902d3] | committer: Paul B Mahol

truehd_core: Disable 16-channel presentation

The most serious bit of the substream_info header field (in a mayor sync
packet) indicates whether a 16-channel presentation is present in the
bitstream. If set, the extended_substream_info header field contains
information about the 16-channel presentation. This presentation always
uses substream 3, a substream that is discarded by truehd_core. So
substream_info needs to be changed to no longer indicate the presence
of a 16-channel presentation in order for truehd_core's output to be
consistent. This is implemented in this commit.

This change also makes MediaInfo no longer display the presence of Atmos
in the output of truehd_core.

Also, set the (now irrelevant) extended_substream_info field to zero as
this seems to be the common value for ordinary TrueHD.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=99c191151a716d8315e938297bd9b50a6a0902d3
---

 libavcodec/truehd_core_bsf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/truehd_core_bsf.c b/libavcodec/truehd_core_bsf.c
index 9e3ee07eed..757d26a10d 100644
--- a/libavcodec/truehd_core_bsf.c
+++ b/libavcodec/truehd_core_bsf.c
@@ -121,7 +121,8 @@ static int truehd_core_filter(AVBSFContext *ctx, AVPacket *out)
             AV_WN64(out->data + out_size - 8, 0);
         if (have_header) {
             memcpy(out->data + 4, in->data + 4, 28);
-            out->data[16 + 4] = (out->data[16 + 4] & 0x0f) | (FFMIN(s->hdr.num_substreams, 3) << 4);
+            out->data[16 + 4] = (out->data[16 + 4] & 0x0c) | (FFMIN(s->hdr.num_substreams, 3) << 4);
+            out->data[17 + 4]&= 0x7f;
             out->data[25 + 4] = out->data[25 + 4] & 0xfe;
             out->data[26 + 4] = 0xff;
             out->data[27 + 4] = 0xff;



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