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src/io/source_avcodec.c: add backward compatibility for libavcodec55

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

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

@@ -38,6 +38,14 @@

 #include <libavutil/opt.h>

 #include <stdlib.h>

+// backward compatibility with libavcodec55

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

+#warning "libavcodec55 is deprecated"

+#define av_frame_alloc  avcodec_alloc_frame

+#define av_frame_free avcodec_free_frame

+#define av_packet_unref av_free_packet

+#endif

+

 #include "aubio_priv.h"

 #include "fvec.h"

 #include "fmat.h"

@@ -507,11 +515,7 @@

     avformat_free_context(s->avFormatCtx);

     s->avFormatCtx = NULL;

   }

-#if FF_API_LAVF_AVCTX

   av_packet_unref(&s->avPacket);

-#else

-  av_free_packet(&s->avPacket);

-#endif

   return AUBIO_OK;

 }