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src/io/source_avcodec.c: give up reading file if number of channel changes during stream (closes #137)

--- a/src/io/source_avcodec.c

+++ b/src/io/source_avcodec.c

@@ -425,6 +425,13 @@

     goto beach;

   }

+  if (avFrame->channels != (sint_t)s->input_channels) {

+    AUBIO_WRN ("source_avcodec: trying to read from %d channel(s),"

+        "but configured for %d; is '%s' corrupt?\n", avFrame->channels,

+        s->input_channels, s->path);

+    goto beach;

+  }

+

 #ifdef HAVE_AVRESAMPLE

   in_linesize = 0;

   av_samples_get_buffer_size(&in_linesize, avCodecCtx->channels,