Change prototype to match upstream change from ffmpeg trunk to fix bu…

…ild with system ffmpeg.

Declare the url_write buffer parameter as const
BUG=45821
TEST=Build with use_system_ffmpeg on and off (1/0).


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@49139 0039d316-1c4b-4281-b951-d872f2087c98

AUTHORS

@@ -78,3 +78,4 @@ Benjamin Jemlich <pcgod99@gmail.com>
 Ningxin Hu <ningxin.hu@intel.com>
 Jared Wein <weinjared@gmail.com>
 Mingmin Xie <melvinxie@gmail.com>
+Michael Gilbert <floppymaster@gmail.com>

media/ffmpeg/file_protocol.cc

@@ -51,7 +51,11 @@ int ReadContext(URLContext* h, unsigned char* buf, int size) {
   return HANDLE_EINTR(read(GetHandle(h), buf, size));
 }
 
+#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(52, 68, 0)
+int WriteContext(URLContext* h, const unsigned char* buf, int size) {
+#else
 int WriteContext(URLContext* h, unsigned char* buf, int size) {
+#endif
   return HANDLE_EINTR(write(GetHandle(h), buf, size));
 }
 

media/filters/ffmpeg_glue.cc

@@ -34,7 +34,11 @@ int ReadContext(URLContext* h, unsigned char* buf, int size) {
   return result;
 }
 
+#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(52, 68, 0)
+int WriteContext(URLContext* h, const unsigned char* buf, int size) {
+#else
 int WriteContext(URLContext* h, unsigned char* buf, int size) {
+#endif
   // We don't support writing.
   return AVERROR_IO;
 }