[FFmpeg-cvslog] aac: correctly map 7.1ch-wide AAC from FDK AAC encoder
nu774
git at videolan.org
Mon Jun 8 01:30:44 CEST 2015
ffmpeg | branch: master | nu774 <honeycomb77 at gmail.com> | Thu Jun 4 14:42:08 2015 +0900| [677c804aa3a78d61b21e6423165a252846c20f0e] | committer: Luca Barbato
aac: correctly map 7.1ch-wide AAC from FDK AAC encoder
FDK AAC encoder outputs SCE(front)+CPE(front)+CPE(back)+CPE(back) on
MODE_7_1_REAR_SURROUND configuration.
Since decoder couldn't properly map 4 back channels, decoding failed
unless -request_channel_layout 0x8000000000000000 has been specified.
Now we treat first CPE(back) as CPE(side) on channel mapping.
Signed-off-by: Luca Barbato <lu_zero at gentoo.org>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=677c804aa3a78d61b21e6423165a252846c20f0e
---
libavcodec/aacdec.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/aacdec.c b/libavcodec/aacdec.c
index 0c7e2c4..74628d6 100644
--- a/libavcodec/aacdec.c
+++ b/libavcodec/aacdec.c
@@ -291,6 +291,11 @@ static uint64_t sniff_channel_order(uint8_t (*layout_map)[3], int tags)
if (num_back_channels < 0)
return 0;
+ if (num_side_channels == 0 && num_back_channels >= 4) {
+ num_side_channels = 2;
+ num_back_channels -= 2;
+ }
+
i = 0;
if (num_front_channels & 1) {
e2c_vec[i] = (struct elem_to_channel) {
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