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ffmpeg / libavcodec / parser.h @ c53d2d90

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/*
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 * AVCodecParser prototypes and definitions
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 * Copyright (c) 2003 Fabrice Bellard.
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 * Copyright (c) 2003 Michael Niedermayer.
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef FFMPEG_PARSER_H
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#define FFMPEG_PARSER_H
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#include "avcodec.h"
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#include "ac3.h"
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typedef struct ParseContext{
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    uint8_t *buffer;
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    int index;
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    int last_index;
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    unsigned int buffer_size;
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    uint32_t state;             ///< contains the last few bytes in MSB order
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    int frame_start_found;
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    int overread;               ///< the number of bytes which where irreversibly read from the next frame
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    int overread_index;         ///< the index into ParseContext.buffer of the overread bytes
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} ParseContext;
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struct MpegEncContext;
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typedef struct ParseContext1{
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    ParseContext pc;
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/* XXX/FIXME PC1 vs. PC */
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    /* MPEG2 specific */
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    AVRational frame_rate;
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    int progressive_sequence;
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    int width, height;
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    /* XXX: suppress that, needed by MPEG4 */
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    struct MpegEncContext *enc;
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    int first_picture;
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} ParseContext1;
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#define END_NOT_FOUND (-100)
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int ff_combine_frame(ParseContext *pc, int next, const uint8_t **buf, int *buf_size);
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int ff_mpeg4video_split(AVCodecContext *avctx, const uint8_t *buf,
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                        int buf_size);
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void ff_parse_close(AVCodecParserContext *s);
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void ff_parse1_close(AVCodecParserContext *s);
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/* h263dec.c */
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int ff_mpeg4_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size);
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/**
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 * Parses AC-3 frame header.
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 * Parses the header up to the lfeon element, which is the first 52 or 54 bits
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 * depending on the audio coding mode.
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 * @param buf[in] Array containing the first 7 bytes of the frame.
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 * @param hdr[out] Pointer to struct where header info is written.
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 * @return Returns 0 on success, -1 if there is a sync word mismatch,
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 * -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
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 * element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
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 */
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int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr);
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#endif /* !FFMPEG_PARSER_H */