channel_layout: add new channel positions supported by xHE-AAC

apichanges will be updated upon merging, as well as a version bump.

libavutil/channel_layout.c

@@ -75,6 +75,10 @@ static const struct channel_name channel_names[] = {
     [AV_CHAN_BOTTOM_FRONT_CENTER  ] = { "BFC",       "bottom front center"   },
     [AV_CHAN_BOTTOM_FRONT_LEFT    ] = { "BFL",       "bottom front left"     },
     [AV_CHAN_BOTTOM_FRONT_RIGHT   ] = { "BFR",       "bottom front right"    },
+    [AV_CHAN_SIDE_SURROUND_LEFT   ] = { "SSL",       "side surround left"    },
+    [AV_CHAN_SIDE_SURROUND_RIGHT  ] = { "SSR",       "side surround right"   },
+    [AV_CHAN_TOP_SURROUND_LEFT    ] = { "TTL",       "top surround left"     },
+    [AV_CHAN_TOP_SURROUND_RIGHT   ] = { "TTR",       "top surround right"    },
 };
 
 void av_channel_name_bprint(AVBPrint *bp, enum AVChannel channel_id)

libavutil/channel_layout.h

@@ -79,6 +79,10 @@ enum AVChannel {
     AV_CHAN_BOTTOM_FRONT_CENTER,
     AV_CHAN_BOTTOM_FRONT_LEFT,
     AV_CHAN_BOTTOM_FRONT_RIGHT,
+    AV_CHAN_SIDE_SURROUND_LEFT,     ///<  +90 degrees, Lss, SiL
+    AV_CHAN_SIDE_SURROUND_RIGHT,    ///<  -90 degrees, Rss, SiR
+    AV_CHAN_TOP_SURROUND_LEFT,      ///< +110 degrees, Lvs, TpLS
+    AV_CHAN_TOP_SURROUND_RIGHT,     ///< -110 degrees, Rvs, TpRS
 
     /** Channel is empty can be safely skipped. */
     AV_CHAN_UNUSED = 0x200,
@@ -195,6 +199,10 @@ enum AVChannelOrder {
 #define AV_CH_BOTTOM_FRONT_CENTER    (1ULL << AV_CHAN_BOTTOM_FRONT_CENTER  )
 #define AV_CH_BOTTOM_FRONT_LEFT      (1ULL << AV_CHAN_BOTTOM_FRONT_LEFT    )
 #define AV_CH_BOTTOM_FRONT_RIGHT     (1ULL << AV_CHAN_BOTTOM_FRONT_RIGHT   )
+#define AV_CH_SIDE_SURROUND_LEFT     (1ULL << AV_CHAN_SIDE_SURROUND_LEFT   )
+#define AV_CH_SIDE_SURROUND_RIGHT    (1ULL << AV_CHAN_SIDE_SURROUND_RIGHT  )
+#define AV_CH_TOP_SURROUND_LEFT      (1ULL << AV_CHAN_TOP_SURROUND_LEFT    )
+#define AV_CH_TOP_SURROUND_RIGHT     (1ULL << AV_CHAN_TOP_SURROUND_RIGHT   )
 
 /**
  * @}