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src/io/source_avcodec.c: fix for old libavcodec54

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

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

@@ -41,6 +41,7 @@

 // backward compatibility with libavcodec55

 #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55,28,1)

 #warning "libavcodec55 is deprecated"

+#define HAVE_AUBIO_LIBAVCODEC_DEPRECATED 1

 #define av_frame_alloc  avcodec_alloc_frame

 #define av_frame_free avcodec_free_frame

 #define av_packet_unref av_free_packet

@@ -512,7 +513,9 @@

   s->avCodecCtx = NULL;

   if (s->avFormatCtx != NULL) {

     avformat_close_input(&s->avFormatCtx);

+#ifndef HAVE_AUBIO_LIBAVCODEC_DEPRECATED // avoid crash on old libavcodec54

     avformat_free_context(s->avFormatCtx);

+#endif

     s->avFormatCtx = NULL;

   }

   av_packet_unref(&s->avPacket);