cbs_jpeg.h

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/*
 * 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 AVCODEC_CBS_JPEG_H
#define AVCODEC_CBS_JPEG_H

#include <stddef.h>
#include <stdint.h>

#include "libavutil/buffer.h"


enum {
    JPEG_MARKER_SOF0    = 0xc0,
    JPEG_MARKER_SOF1    = 0xc1,
    JPEG_MARKER_SOF2    = 0xc2,
    JPEG_MARKER_SOF3    = 0xc3,

    JPEG_MARKER_DHT     = 0xc4,
    JPEG_MARKER_SOI     = 0xd8,
    JPEG_MARKER_EOI     = 0xd9,
    JPEG_MARKER_SOS     = 0xda,
    JPEG_MARKER_DQT     = 0xdb,

    JPEG_MARKER_APPN    = 0xe0,
    JPEG_MARKER_JPGN    = 0xf0,
    JPEG_MARKER_COM     = 0xfe,
};

enum {
    JPEG_MAX_COMPONENTS = 255,

    JPEG_MAX_HEIGHT = 65535,
    JPEG_MAX_WIDTH  = 65535,
};


typedef struct JPEGRawFrameHeader {
    uint16_t Lf;
    uint8_t  P;
    uint16_t Y;
    uint16_t X;
    uint16_t Nf;

    uint8_t  C [JPEG_MAX_COMPONENTS];
    uint8_t  H [JPEG_MAX_COMPONENTS];
    uint8_t  V [JPEG_MAX_COMPONENTS];
    uint8_t  Tq[JPEG_MAX_COMPONENTS];
} JPEGRawFrameHeader;

typedef struct JPEGRawScanHeader {
    uint16_t Ls;
    uint8_t  Ns;

    uint8_t  Cs[JPEG_MAX_COMPONENTS];
    uint8_t  Td[JPEG_MAX_COMPONENTS];
    uint8_t  Ta[JPEG_MAX_COMPONENTS];

    uint8_t  Ss;
    uint8_t  Se;
    uint8_t  Ah;
    uint8_t  Al;
} JPEGRawScanHeader;

typedef struct JPEGRawScan {
    JPEGRawScanHeader header;
    uint8_t          *data;
    size_t            data_size;
    AVBufferRef      *data_ref;
} JPEGRawScan;

typedef struct JPEGRawQuantisationTable {
    uint8_t  Pq;
    uint8_t  Tq;
    uint16_t Q[64];
} JPEGRawQuantisationTable;

typedef struct JPEGRawQuantisationTableSpecification {
    uint16_t Lq;
    JPEGRawQuantisationTable table[4];
} JPEGRawQuantisationTableSpecification;

typedef struct JPEGRawHuffmanTable {
    uint8_t  Tc;
    uint8_t  Th;
    uint8_t  L[16];
    uint8_t  V[224];
} JPEGRawHuffmanTable;

typedef struct JPEGRawHuffmanTableSpecification {
    uint16_t Lh;
    JPEGRawHuffmanTable table[8];
} JPEGRawHuffmanTableSpecification;

typedef struct JPEGRawApplicationData {
    uint16_t     Lp;
    uint8_t     *Ap;
    AVBufferRef *Ap_ref;
} JPEGRawApplicationData;

typedef struct JPEGRawComment {
    uint16_t     Lc;
    uint8_t     *Cm;
    AVBufferRef *Cm_ref;
} JPEGRawComment;


typedef struct CodedBitstreamJPEGContext {
    // Write buffer.
    uint8_t *write_buffer;
    size_t write_buffer_size;
} CodedBitstreamJPEGContext;


#endif /* AVCODEC_CBS_JPEG_H */