2 * AVCodecParser prototypes and definitions
3 * Copyright (c) 2003 Fabrice Bellard.
4 * Copyright (c) 2003 Michael Niedermayer.
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #ifndef FFMPEG_PARSER_H
24 #define FFMPEG_PARSER_H
29 typedef struct ParseContext{
33 unsigned int buffer_size;
34 uint32_t state; ///< contains the last few bytes in MSB order
35 int frame_start_found;
36 int overread; ///< the number of bytes which where irreversibly read from the next frame
37 int overread_index; ///< the index into ParseContext.buffer of the overread bytes
40 struct MpegEncContext;
42 typedef struct ParseContext1{
44 /* XXX/FIXME PC1 vs. PC */
46 AVRational frame_rate;
47 int progressive_sequence;
50 /* XXX: suppress that, needed by MPEG4 */
51 struct MpegEncContext *enc;
55 #define END_NOT_FOUND (-100)
57 int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size);
58 int ff_mpeg4video_split(AVCodecContext *avctx, const uint8_t *buf,
60 void ff_parse_close(AVCodecParserContext *s);
61 void ff_parse1_close(AVCodecParserContext *s);
64 int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);
67 * Parses AC-3 frame header.
68 * Parses the header up to the lfeon element, which is the first 52 or 54 bits
69 * depending on the audio coding mode.
70 * @param buf[in] Array containing the first 7 bytes of the frame.
71 * @param hdr[out] Pointer to struct where header info is written.
72 * @return Returns 0 on success, -1 if there is a sync word mismatch,
73 * -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
74 * element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
76 int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr);
78 #endif /* !FFMPEG_PARSER_H */