Move ff_flac_write_header() to flacenc.h, which removes the Matroska muxer's

dependency on flacenc.o and fixes the unnecessary dependency on vorbiscomment.o.

Originally committed as revision 22639 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 25 insertions, 2 deletions

diff --git a/libavformat/flacenc.h b/libavformat/flacenc.h
index 748c68ea89..471376692a 100644
--- a/libavformat/flacenc.h
+++ b/libavformat/flacenc.h
@@ -22,9 +22,32 @@
 #ifndef AVFORMAT_FLACENC_H
 #define AVFORMAT_FLACENC_H
 
+#include "libavcodec/flac.h"
+#include "libavcodec/bytestream.h"
 #include "avformat.h"
 
-int ff_flac_write_header(ByteIOContext *pb, AVCodecContext *codec,
-                         int last_block);
+static int ff_flac_write_header(ByteIOContext *pb, AVCodecContext *codec,
+                                int last_block)
+{
+    uint8_t header[8] = {
+        0x66, 0x4C, 0x61, 0x43, 0x00, 0x00, 0x00, 0x22
+    };
+    uint8_t *streaminfo;
+    enum FLACExtradataFormat format;
+
+    header[4] = last_block ? 0x80 : 0x00;
+    if (!ff_flac_is_extradata_valid(codec, &format, &streaminfo))
+        return -1;
+
+    /* write "fLaC" stream marker and first metadata block header if needed */
+    if (format == FLAC_EXTRADATA_FORMAT_STREAMINFO) {
+        put_buffer(pb, header, 8);
+    }
+
+    /* write STREAMINFO or full header */
+    put_buffer(pb, codec->extradata, codec->extradata_size);
+
+    return 0;
+}
 
 #endif /* AVFORMAT_FLACENC_H */