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src/io/source_avcodec.c: check if the uri is a network stream using av_url_split, call avformat_network_init() if needed

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

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

@@ -72,6 +72,21 @@

 void aubio_source_avcodec_reset_resampler(aubio_source_avcodec_t * s, uint_t multi);

 void aubio_source_avcodec_readframe(aubio_source_avcodec_t *s, uint_t * read_samples);

+uint_t aubio_source_avcodec_has_network_url(aubio_source_avcodec_t *s);

+

+uint_t aubio_source_avcodec_has_network_url(aubio_source_avcodec_t *s) {

+  char proto[20], authorization[256], hostname[128], uripath[256];

+  int proto_size = 20, authorization_size = 256, hostname_size = 128,

+      *port_ptr = 0, path_size = 256;

+  av_url_split(proto, proto_size, authorization, authorization_size, hostname,

+      hostname_size, port_ptr, uripath, path_size, s->path);

+  if (strlen(proto)) {

+    return 1;

+  }

+  return 0;

+}

+

+

 aubio_source_avcodec_t * new_aubio_source_avcodec(const char_t * path, uint_t samplerate, uint_t hop_size) {

   aubio_source_avcodec_t * s = AUBIO_NEW(aubio_source_avcodec_t);

   int err;

@@ -98,8 +113,9 @@

   // register all formats and codecs

   av_register_all();

-  // if path[0] != '/'

-  //avformat_network_init();

+  if (aubio_source_avcodec_has_network_url(s)) {

+    avformat_network_init();

+  }

   // try opening the file and get some info about it

   AVFormatContext *avFormatCtx = s->avFormatCtx;