libavcodec/ivi_common.h

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/*
 * common functions for Indeo Video Interactive codecs (Indeo4 and Indeo5)
 *
 * Copyright (c) 2009 Maxim Poliakovski
 *
 * 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_IVI_COMMON_H
#define AVCODEC_IVI_COMMON_H

#include "avcodec.h"
#include "get_bits.h"
#include <stdint.h>

#define IVI_VLC_BITS 13 
#define IVI4_STREAM_ANALYSER    0
#define IVI5_IS_PROTECTED       0x20

typedef struct {
    int32_t     num_rows;
    uint8_t     xbits[16];
} IVIHuffDesc;

typedef struct {
    int32_t     tab_sel;    

    VLC         *tab;       

    IVIHuffDesc cust_desc;  
    VLC         cust_tab;   
} IVIHuffTab;

enum {
    IVI_MB_HUFF   = 0,      
    IVI_BLK_HUFF  = 1       
};

extern VLC ff_ivi_mb_vlc_tabs [8]; 
extern VLC ff_ivi_blk_vlc_tabs[8]; 


extern const uint8_t ff_ivi_vertical_scan_8x8[64];
extern const uint8_t ff_ivi_horizontal_scan_8x8[64];
extern const uint8_t ff_ivi_direct_scan_4x4[16];


typedef void (InvTransformPtr)(const int32_t *in, int16_t *out, uint32_t pitch, const uint8_t *flags);
typedef void (DCTransformPtr) (const int32_t *in, int16_t *out, uint32_t pitch, int blk_size);


typedef struct {
    uint8_t     eob_sym; 
    uint8_t     esc_sym; 
    uint8_t     runtab[256];
    int8_t      valtab[256];
} RVMapDesc;

extern const RVMapDesc ff_ivi_rvmap_tabs[9];


typedef struct {
    int16_t     xpos;
    int16_t     ypos;
    uint32_t    buf_offs; 
    uint8_t     type;     
    uint8_t     cbp;      
    int8_t      q_delta;  
    int8_t      mv_x;     
    int8_t      mv_y;     
} IVIMbInfo;


typedef struct {
    int         xpos;
    int         ypos;
    int         width;
    int         height;
    int         mb_size;
    int         is_empty;  
    int         data_size; 
    int         num_MBs;   
    IVIMbInfo   *mbs;      
    IVIMbInfo   *ref_mbs;  
} IVITile;


typedef struct {
    int             plane;          
    int             band_num;       
    int             width;
    int             height;
    int             aheight;        
    const uint8_t   *data_ptr;      
    int             data_size;      
    int16_t         *buf;           
    int16_t         *ref_buf;       
    int16_t         *bufs[3];       
    int             pitch;          
    int             is_empty;       
    int             mb_size;        
    int             blk_size;       
    int             is_halfpel;     
    int             inherit_mv;     
    int             inherit_qdelta; 
    int             qdelta_present; 
    int             quant_mat;      
    int             glob_quant;     
    const uint8_t   *scan;          

    IVIHuffTab      blk_vlc;        

    int             num_corr;       
    uint8_t         corr[61*2];     
    int             rvmap_sel;      
    RVMapDesc       *rv_map;        
    int             num_tiles;      
    IVITile         *tiles;         
    InvTransformPtr *inv_transform;
    DCTransformPtr  *dc_transform;
    int             is_2d_trans;    
    int32_t         checksum;       
    int             checksum_present;
    int             bufsize;        
    const uint16_t  *intra_base;    
    const uint16_t  *inter_base;    
    const uint8_t   *intra_scale;   
    const uint8_t   *inter_scale;   
} IVIBandDesc;


typedef struct {
    uint16_t    width;
    uint16_t    height;
    uint8_t     num_bands;  
    IVIBandDesc *bands;     
} IVIPlaneDesc;


typedef struct {
    uint16_t    pic_width;
    uint16_t    pic_height;
    uint16_t    chroma_width;
    uint16_t    chroma_height;
    uint16_t    tile_width;
    uint16_t    tile_height;
    uint8_t     luma_bands;
    uint8_t     chroma_bands;
} IVIPicConfig;

typedef struct IVI45DecContext {
    GetBitContext   gb;
    AVFrame         frame;
    RVMapDesc       rvmap_tabs[9];   

    uint32_t        frame_num;
    int             frame_type;
    int             prev_frame_type; 
    uint32_t        data_size;       
    int             is_scalable;
    int             transp_status;   
    const uint8_t   *frame_data;     
    int             inter_scal;      
    uint32_t        frame_size;      
    uint32_t        pic_hdr_size;    
    uint8_t         frame_flags;
    uint16_t        checksum;        

    IVIPicConfig    pic_conf;
    IVIPlaneDesc    planes[3];       

    int             buf_switch;      
    int             dst_buf;         
    int             ref_buf;         
    int             ref2_buf;        

    IVIHuffTab      mb_vlc;          
    IVIHuffTab      blk_vlc;         

    uint8_t         rvmap_sel;
    uint8_t         in_imf;
    uint8_t         in_q;            
    uint8_t         pic_glob_quant;
    uint8_t         unknown1;

    uint16_t        gop_hdr_size;
    uint8_t         gop_flags;
    uint32_t        lock_word;

#if IVI4_STREAM_ANALYSER
    uint8_t         has_b_frames;
    uint8_t         has_transp;
    uint8_t         uses_tiling;
    uint8_t         uses_haar;
    uint8_t         uses_fullpel;
#endif

    int             (*decode_pic_hdr)  (struct IVI45DecContext *ctx, AVCodecContext *avctx);
    int             (*decode_band_hdr) (struct IVI45DecContext *ctx, IVIBandDesc *band, AVCodecContext *avctx);
    int             (*decode_mb_info)  (struct IVI45DecContext *ctx, IVIBandDesc *band, IVITile *tile, AVCodecContext *avctx);
    void            (*switch_buffers)  (struct IVI45DecContext *ctx);
    int             (*is_nonnull_frame)(struct IVI45DecContext *ctx);

    int gop_invalid;
} IVI45DecContext;

static inline int ivi_pic_config_cmp(IVIPicConfig *str1, IVIPicConfig *str2)
{
    return str1->pic_width    != str2->pic_width    || str1->pic_height    != str2->pic_height    ||
           str1->chroma_width != str2->chroma_width || str1->chroma_height != str2->chroma_height ||
           str1->tile_width   != str2->tile_width   || str1->tile_height   != str2->tile_height   ||
           str1->luma_bands   != str2->luma_bands   || str1->chroma_bands  != str2->chroma_bands;
}

#define IVI_NUM_TILES(stride, tile_size) (((stride) + (tile_size) - 1) / (tile_size))

#define IVI_MBs_PER_TILE(tile_width, tile_height, mb_size) \
    ((((tile_width) + (mb_size) - 1) / (mb_size)) * (((tile_height) + (mb_size) - 1) / (mb_size)))

#define IVI_TOSIGNED(val) (-(((val) >> 1) ^ -((val) & 1)))

static inline int ivi_scale_mv(int mv, int mv_scale)
{
    return (mv + (mv > 0) + (mv_scale - 1)) >> mv_scale;
}

int  ff_ivi_create_huff_from_desc(const IVIHuffDesc *cb, VLC *vlc, int flag);

void ff_ivi_init_static_vlc(void);

int  ff_ivi_dec_huff_desc(GetBitContext *gb, int desc_coded, int which_tab,
                          IVIHuffTab *huff_tab, AVCodecContext *avctx);

int  ff_ivi_huff_desc_cmp(const IVIHuffDesc *desc1, const IVIHuffDesc *desc2);

void ff_ivi_huff_desc_copy(IVIHuffDesc *dst, const IVIHuffDesc *src);

int  ff_ivi_init_planes(IVIPlaneDesc *planes, const IVIPicConfig *cfg);

void ff_ivi_free_buffers(IVIPlaneDesc *planes);

int  ff_ivi_init_tiles(IVIPlaneDesc *planes, int tile_width, int tile_height);

int  ff_ivi_dec_tile_data_size(GetBitContext *gb);

int  ff_ivi_decode_blocks(GetBitContext *gb, IVIBandDesc *band, IVITile *tile);

void ff_ivi_output_plane(IVIPlaneDesc *plane, uint8_t *dst, int dst_pitch);

uint16_t ivi_calc_band_checksum (IVIBandDesc *band);

int ivi_check_band (IVIBandDesc *band, const uint8_t *ref, int pitch);

int ff_ivi_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
                        AVPacket *avpkt);
av_cold int ff_ivi_decode_close(AVCodecContext *avctx);

#endif /* AVCODEC_IVI_COMMON_H */

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