1 files changed, 47 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/ac3_parser.h b/contrib/ffmpeg/libavcodec/ac3_parser.h
new file mode 100644
index 000000000..ffac6190f
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/ac3_parser.h
@@ -0,0 +1,47 @@
+/*
+ * AC3 parser prototypes
+ * Copyright (c) 2003 Fabrice Bellard.
+ * Copyright (c) 2003 Michael Niedermayer.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef FFMPEG_AC3_PARSER_H
+#define FFMPEG_AC3_PARSER_H
+
+#include "ac3.h"
+
+typedef enum {
+    AC3_PARSE_ERROR_SYNC        = -1,
+    AC3_PARSE_ERROR_BSID        = -2,
+    AC3_PARSE_ERROR_SAMPLE_RATE = -3,
+    AC3_PARSE_ERROR_FRAME_SIZE  = -4,
+} AC3ParseError;
+
+/**
+ * Parses AC-3 frame header.
+ * Parses the header up to the lfeon element, which is the first 52 or 54 bits
+ * depending on the audio coding mode.
+ * @param buf[in] Array containing the first 7 bytes of the frame.
+ * @param hdr[out] Pointer to struct where header info is written.
+ * @return Returns 0 on success, -1 if there is a sync word mismatch,
+ * -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
+ * element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
+ */
+int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr);
+
+#endif /* FFMPEG_AC3_PARSER_H */