avcodec/g722enc: force mono channel layout

Signed-off-by: Kyle Swanson <k@ylo.ph>

libavcodec/g722enc.c

@@ -61,11 +61,6 @@ static av_cold int g722_encode_init(AVCodecContext * avctx)
     G722Context *c = avctx->priv_data;
     int ret;
 
-    if (avctx->channels != 1) {
-        av_log(avctx, AV_LOG_ERROR, "Only mono tracks are allowed.\n");
-        return AVERROR_INVALIDDATA;
-    }
-
     c->band[0].scale_factor = 8;
     c->band[1].scale_factor = 2;
     c->prev_samples_pos = 22;
@@ -390,6 +385,6 @@ AVCodec ff_adpcm_g722_encoder = {
     .close           = g722_encode_close,
     .encode2         = g722_encode_frame,
     .capabilities    = AV_CODEC_CAP_SMALL_LAST_FRAME,
-    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
-                                                     AV_SAMPLE_FMT_NONE },
+    .sample_fmts     = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE },
+    .channel_layouts = (const uint64_t[]){ AV_CH_LAYOUT_MONO, 0 },
 };