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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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c5a17000b6
The decoder seems to default to 6 channels max, downmixing 7.1 to 5.1.
Disable the channel limit to expose all channels to GStreamer.
In addition, none of the standard configurations use ACT_SIDE channels.
The rear channels of the 7.1 configuration have to be taken from
ACT_BACK. See the table in aacenc_lib.h, reproduced here:
----------------------------------------------------------------------------------------
ChannelMode | ChCfg | Height | front_El | side_El | back_El | lfe_El
-----------------------+-------+--------+---------------+----------+----------+---------
MODE_1 | 1 | NORM | SCE | | |
MODE_2 | 2 | NORM | CPE | | |
MODE_1_2 | 3 | NORM | SCE, CPE | | |
MODE_1_2_1 | 4 | NORM | SCE, CPE | | SCE |
MODE_1_2_2 | 5 | NORM | SCE, CPE | | CPE |
MODE_1_2_2_1 | 6 | NORM | SCE, CPE | | CPE | LFE
MODE_1_2_2_2_1 | 7 | NORM | SCE, CPE, CPE | | CPE | LFE
MODE_6_1 | 11 | NORM | SCE, CPE | | CPE, SCE | LFE
MODE_7_1_BACK | 12 | NORM | SCE, CPE | | CPE, CPE | LFE
-----------------------+-------+--------+---------------+----------+----------+---------
MODE_7_1_TOP_FRONT | 14 | NORM | SCE, CPE | | CPE | LFE
| | TOP | CPE | | |
-----------------------+-------+--------+---------------+----------+----------+---------
MODE_7_1_REAR_SURROUND | 0 | NORM | SCE, CPE | | CPE, CPE | LFE
MODE_7_1_FRONT_CENTER | 0 | NORM | SCE, CPE, CPE | | CPE | LFE
----------------------------------------------------------------------------------------
- NORM: Normal Height Layer. - TOP: Top Height Layer. - BTM: Bottom Height Layer.
- SCE: Single Channel Element. - CPE: Channel Pair. - LFE: Low Frequency Element.
Restores 8 channels to
https://www2.iis.fraunhofer.de/AAC/7.1auditionOutLeader_v2_rtb.mp4
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| .. | ||
| aom | ||
| assrender | ||
| bs2b | ||
| bz2 | ||
| chromaprint | ||
| closedcaption | ||
| colormanagement | ||
| curl | ||
| dash | ||
| dc1394 | ||
| directfb | ||
| dtls | ||
| dts | ||
| faac | ||
| faad | ||
| fdkaac | ||
| flite | ||
| fluidsynth | ||
| gl | ||
| gme | ||
| gsm | ||
| hls | ||
| iqa | ||
| kate | ||
| ladspa | ||
| libde265 | ||
| libmms | ||
| lv2 | ||
| modplug | ||
| mpeg2enc | ||
| mplex | ||
| musepack | ||
| neon | ||
| ofa | ||
| openal | ||
| opencv | ||
| openexr | ||
| openh264 | ||
| openjpeg | ||
| openmpt | ||
| openni2 | ||
| opus | ||
| resindvd | ||
| rsvg | ||
| rtmp | ||
| sbc | ||
| sctp | ||
| smoothstreaming | ||
| sndfile | ||
| soundtouch | ||
| spandsp | ||
| srt | ||
| srtp | ||
| teletextdec | ||
| ttml | ||
| voaacenc | ||
| voamrwbenc | ||
| vulkan | ||
| wayland | ||
| webp | ||
| webrtc | ||
| webrtcdsp | ||
| wildmidi | ||
| wpe | ||
| x265 | ||
| zbar | ||
| Makefile.am | ||
| meson.build | ||