AV_CH_LAYOUT_2_2 does not need channel reordering for alsa output.

libavdevice/alsa-audio-common.c

@@ -134,7 +134,8 @@ static av_cold ff_reorder_func find_reorder_func(int codec_id,
     return
     codec_id == CODEC_ID_PCM_U16LE || codec_id == CODEC_ID_PCM_U16BE ||
     codec_id == CODEC_ID_PCM_S16LE || codec_id == CODEC_ID_PCM_S16BE ?
-        layout == AV_CH_LAYOUT_QUAD ? REORDER_DUMMY :
+        layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2 ?
+            REORDER_DUMMY :
         layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0 ?
             out ? alsa_reorder_int16_out_50 : NULL :
         layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1 ?
@@ -144,7 +145,8 @@ static av_cold ff_reorder_func find_reorder_func(int codec_id,
             NULL :
     codec_id == CODEC_ID_PCM_U32LE || codec_id == CODEC_ID_PCM_U32BE ||
     codec_id == CODEC_ID_PCM_S32LE || codec_id == CODEC_ID_PCM_S32BE ?
-        layout == AV_CH_LAYOUT_QUAD ? REORDER_DUMMY :
+        layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2 ?
+            REORDER_DUMMY :
         layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0 ?
             out ? alsa_reorder_int32_out_50 : NULL :
         layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1 ?
@@ -153,7 +155,8 @@ static av_cold ff_reorder_func find_reorder_func(int codec_id,
             out ? alsa_reorder_int32_out_71 : NULL :
             NULL :
     codec_id == CODEC_ID_PCM_F32LE || codec_id == CODEC_ID_PCM_F32BE ?
-        layout == AV_CH_LAYOUT_QUAD ? REORDER_DUMMY :
+        layout == AV_CH_LAYOUT_QUAD || layout == AV_CH_LAYOUT_2_2 ?
+            REORDER_DUMMY :
         layout == AV_CH_LAYOUT_5POINT0_BACK || layout == AV_CH_LAYOUT_5POINT0 ?
             out ? alsa_reorder_f32_out_50 : NULL :
         layout == AV_CH_LAYOUT_5POINT1_BACK || layout == AV_CH_LAYOUT_5POINT1 ?