On 2/15/2022 8:50 AM, Anton Khirnov wrote:
Quoting James Almer (2022-01-13 03:09:07)
@@ -212,31 +212,31 @@ static int config_input(AVFilterLink *inlink)
          return AVERROR(ENOMEM);
      for (ch = 0;  ch < s->nb_in_channels; ch++)
          s->input_levels[ch] = s->level_in;
-    ch = av_get_channel_layout_channel_index(inlink->channel_layout, 
AV_CH_FRONT_CENTER);
+    ch = av_channel_layout_index_from_channel(&inlink->ch_layout, 
AV_CHAN_FRONT_CENTER);
      if (ch >= 0)
          s->input_levels[ch] *= s->fc_in;
-    ch = av_get_channel_layout_channel_index(inlink->channel_layout, 
AV_CH_FRONT_LEFT);
+    ch = av_channel_layout_index_from_channel(&inlink->ch_layout, 
AV_CHAN_FRONT_LEFT);
      if (ch >= 0)
          s->input_levels[ch] *= s->fl_in;
-    ch = av_get_channel_layout_channel_index(inlink->channel_layout, 
AV_CH_FRONT_RIGHT);
+    ch = av_channel_layout_index_from_channel(&inlink->ch_layout, 
AV_CHAN_FRONT_RIGHT);
      if (ch >= 0)
          s->input_levels[ch] *= s->fr_in;
-    ch = av_get_channel_layout_channel_index(inlink->channel_layout, 
AV_CH_SIDE_LEFT);
+    ch = av_channel_layout_index_from_channel(&inlink->ch_layout, 
AV_CHAN_SIDE_LEFT);
      if (ch >= 0)
          s->input_levels[ch] *= s->sl_in;
-    ch = av_get_channel_layout_channel_index(inlink->channel_layout, 
AV_CH_SIDE_RIGHT);
+    ch = av_channel_layout_index_from_channel(&inlink->ch_layout, 
AV_CHAN_SIDE_RIGHT);
      if (ch >= 0)
          s->input_levels[ch] *= s->sr_in;
-    ch = av_get_channel_layout_channel_index(inlink->channel_layout, 
AV_CH_BACK_LEFT);
+    ch = av_channel_layout_index_from_channel(&inlink->ch_layout, 
AV_CHAN_BACK_LEFT);
      if (ch >= 0)
          s->input_levels[ch] *= s->bl_in;
-    ch = av_get_channel_layout_channel_index(inlink->channel_layout, 
AV_CH_BACK_RIGHT);
+    ch = av_channel_layout_index_from_channel(&inlink->ch_layout, 
AV_CHAN_BACK_RIGHT);
      if (ch >= 0)
          s->input_levels[ch] *= s->br_in;
-    ch = av_get_channel_layout_channel_index(inlink->channel_layout, 
AV_CH_BACK_CENTER);
+    ch = av_channel_layout_index_from_channel(&inlink->ch_layout, 
AV_CHAN_BACK_CENTER);
      if (ch >= 0)
          s->input_levels[ch] *= s->bc_in;
-    ch = av_get_channel_layout_channel_index(inlink->channel_layout, 
AV_CH_LOW_FREQUENCY);
+    ch = av_channel_layout_index_from_channel(&inlink->ch_layout, 
AV_CHAN_LOW_FREQUENCY);
      if (ch >= 0)

Make all those compare to AV_CHAN_NONE

ch is an index, so either >= 0, or EINVAL.
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