ac3_parser: add a public function for parsing the data required by the demuxer

[ffmpeg] / libavcodec / ac3_parser.h

diff --git a/libavcodec/ac3_parser.h b/libavcodec/ac3_parser.h
index e49492558ab7b67553d6c2521eeb5d3c052d549f..f78c461041a50accadbee9b932be3acb71ff2954 100644 (file)
--- a/libavcodec/ac3_parser.h
+++ b/libavcodec/ac3_parser.h
@@ -1,61 +1,36 @@
 /*
  * AC-3 parser prototypes
- * Copyright (c) 2003 Fabrice Bellard.
- * Copyright (c) 2003 Michael Niedermayer.
+ * Copyright (c) 2003 Fabrice Bellard
+ * Copyright (c) 2003 Michael Niedermayer
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; 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
+#ifndef AVCODEC_AC3_PARSER_H
+#define AVCODEC_AC3_PARSER_H
 
-#include "ac3.h"
-#include "bitstream.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,
-    AC3_PARSE_ERROR_FRAME_TYPE  = -5,
-    AC3_PARSE_ERROR_CRC         = -6,
-} AC3ParseError;
+#include <stddef.h>
+#include <stdint.h>
 
 /**
- * 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 gbc[in] BitContext containing the first 54 bits 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.
+ * Extract the bitstream ID and the frame size from AC-3 data.
  */
-int ff_ac3_parse_header(GetBitContext *gbc, AC3HeaderInfo *hdr);
+int av_ac3_parse_header(const uint8_t *buf, size_t size,
+                        uint8_t *bitstream_id, uint16_t *frame_size);
 
-/**
- * Parses AC-3 frame header and sets channel_map
- * Parses the header up to the lfeon (channel_map in E-AC-3)
- * element, which is the first 52, 54 or 104 bits depending
- * on the audio coding mode.
- * @param gbc[in] BitContext containing the first 54 bits of the frame.
- * @param hdr[out] Pointer to struct where header info is written.
- * @return value returned by ff_ac3_parse_header
- */
-int ff_ac3_parse_header_full(GetBitContext *gbc, AC3HeaderInfo *hdr);
 
-#endif /* FFMPEG_AC3_PARSER_H */
+#endif /* AVCODEC_AC3_PARSER_H */