avformat/utils: Move ff_get_extradata to demux_utils.c

It is only used by demuxers (although it is hypothetically
possible that some day e.g. a protocol might need it, but
that is unlikely given that they don't deal with AVCodecParameters).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/libavformat/demux_utils.c b/libavformat/demux_utils.c
index 8a1e4ff5c0..a59476e0da 100644
--- a/libavformat/demux_utils.c
+++ b/libavformat/demux_utils.c
@@ -25,6 +25,7 @@
 #include "libavcodec/bytestream.h"
 #include "libavcodec/packet_internal.h"
 #include "avformat.h"
+#include "avio_internal.h"
 #include "demux.h"
 #include "internal.h"
 
@@ -350,3 +351,19 @@ int ff_generate_avci_extradata(AVStream *st)
 
     return 0;
 }
+
+int ff_get_extradata(void *logctx, AVCodecParameters *par, AVIOContext *pb, int size)
+{
+    int ret = ff_alloc_extradata(par, size);
+    if (ret < 0)
+        return ret;
+    ret = ffio_read_size(pb, par->extradata, size);
+    if (ret < 0) {
+        av_freep(&par->extradata);
+        par->extradata_size = 0;
+        av_log(logctx, AV_LOG_ERROR, "Failed to read extradata of size %d\n", size);
+        return ret;
+    }
+
+    return ret;
+}