avcodec/avcodec: Use the new API fields to validate the layout returned by decoders

This block was scheduled for removal, which means that no validation would have
taken place after the old API was removed.
It was algo going to mistakenly remove an unrelated bits_per_coded_sample
check.

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/avcodec.c

@@ -321,24 +321,12 @@ FF_DISABLE_DEPRECATION_WARNINGS
         avctx->channels = avctx->ch_layout.nb_channels;
         avctx->channel_layout = avctx->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
                                 avctx->ch_layout.u.mask : 0;
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
 
         /* validate channel layout from the decoder */
-        if (avctx->channel_layout) {
-            int channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
-            if (!avctx->channels)
-                avctx->channels = channels;
-            else if (channels != avctx->channels) {
-                char buf[512];
-                av_get_channel_layout_string(buf, sizeof(buf), -1, avctx->channel_layout);
-                av_log(avctx, AV_LOG_WARNING,
-                       "Channel layout '%s' with %d channels does not match specified number of channels %d: "
-                       "ignoring specified channel layout\n",
-                       buf, channels, avctx->channels);
-                avctx->channel_layout = 0;
-            }
-        }
-        if (avctx->channels && avctx->channels < 0 ||
-            avctx->channels > FF_SANE_NB_CHANNELS) {
+        if ((avctx->ch_layout.nb_channels && !av_channel_layout_check(&avctx->ch_layout)) ||
+            avctx->ch_layout.nb_channels > FF_SANE_NB_CHANNELS) {
             ret = AVERROR(EINVAL);
             goto free_and_end;
         }
@@ -346,8 +334,6 @@ FF_DISABLE_DEPRECATION_WARNINGS
             ret = AVERROR(EINVAL);
             goto free_and_end;
         }
-FF_ENABLE_DEPRECATION_WARNINGS
-#endif
 
 #if FF_API_AVCTX_TIMEBASE
         if (avctx->framerate.num > 0 && avctx->framerate.den > 0)