+ if (avctx->channels > 1) {
+ av_log_missing_feature(avctx, "multi-channel AMR", 0);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ avctx->channels = 1;
+ avctx->channel_layout = AV_CH_LAYOUT_MONO;
+ avctx->sample_rate = 8000;
+ avctx->sample_fmt = AV_SAMPLE_FMT_FLT;