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src/io/source_avcodec.c: avoid seeking in closed file

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

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

@@ -477,10 +477,17 @@

   int64_t min_ts = MAX(resampled_pos - 2000, 0);

   int64_t max_ts = MIN(resampled_pos + 2000, INT64_MAX);

   int seek_flags = AVSEEK_FLAG_FRAME | AVSEEK_FLAG_ANY;

-  int ret = avformat_seek_file(s->avFormatCtx, s->selected_stream,

+  int ret = AUBIO_FAIL;

+  if (s->avFormatCtx != NULL && s->avr != NULL) {

+    ret = AUBIO_OK;

+  } else {

+    AUBIO_ERR("source_avcodec: failed seeking in %s (file not opened?)", s->path);

+    return ret;

+  }

+  ret = avformat_seek_file(s->avFormatCtx, s->selected_stream,

       min_ts, resampled_pos, max_ts, seek_flags);

   if (ret < 0) {

-    AUBIO_ERR("Failed seeking to %d in file %s", pos, s->path);

+    AUBIO_ERR("source_avcodec: failed seeking to %d in file %s", pos, s->path);

   }

   // reset read status

   s->eof = 0;