AV_CH_BACK_CENTER   88 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_2_1               (AV_CH_LAYOUT_STEREO|AV_CH_BACK_CENTER)
AV_CH_BACK_CENTER   91 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_4POINT0           (AV_CH_LAYOUT_SURROUND|AV_CH_BACK_CENTER)
AV_CH_BACK_CENTER   99 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_6POINT0           (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_CENTER)
AV_CH_BACK_CENTER  101 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_HEXAGONAL         (AV_CH_LAYOUT_5POINT0_BACK|AV_CH_BACK_CENTER)
AV_CH_BACK_CENTER  102 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_6POINT1           (AV_CH_LAYOUT_5POINT1|AV_CH_BACK_CENTER)
AV_CH_BACK_CENTER  103 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_6POINT1_BACK      (AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER)
AV_CH_BACK_CENTER  110 3rdparty/include/ffmpeg_/libavutil/channel_layout.h #define AV_CH_LAYOUT_OCTAGONAL         (AV_CH_LAYOUT_5POINT0|AV_CH_BACK_LEFT|AV_CH_BACK_CENTER|AV_CH_BACK_RIGHT)