mpv/libmpeg2/mpeg2_internal.h

/*
 * mpeg2_internal.h
 * Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
 *
 * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
 *
 * mpeg2dec is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * mpeg2dec 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/* macroblock modes */
#define MACROBLOCK_INTRA 1
#define MACROBLOCK_PATTERN 2
#define MACROBLOCK_MOTION_BACKWARD 4
#define MACROBLOCK_MOTION_FORWARD 8
#define MACROBLOCK_QUANT 16
#define DCT_TYPE_INTERLACED 32
/* motion_type */
#define MOTION_TYPE_MASK (3*64)
#define MOTION_TYPE_BASE 64
#define MC_FIELD (1*64)
#define MC_FRAME (2*64)
#define MC_16X8 (2*64)
#define MC_DMV (3*64)

/* picture structure */
#define TOP_FIELD 1
#define BOTTOM_FIELD 2
#define FRAME_PICTURE 3

/* picture coding type */
#define I_TYPE 1
#define P_TYPE 2
#define B_TYPE 3
#define D_TYPE 4

typedef struct motion_s {
    uint8_t * ref[2][3];
    int pmv[2][2];
    int f_code[2];
} motion_t;

typedef struct vo_frame_s {
    uint8_t * base[3];	/* pointer to 3 planes */
    void (* copy) (struct vo_frame_s * frame, uint8_t ** src);
    void* vo;
//    int slice;
//    void (* field) (struct vo_frame_s * frame, int flags);
//    void (* draw) (struct vo_frame_s * frame);
//    vo_instance_t * instance;
} vo_frame_t;

typedef struct picture_s {
    /* first, state that carries information from one macroblock to the */
    /* next inside a slice, and is never used outside of slice_process() */

    /* DCT coefficients - should be kept aligned ! */
    int16_t DCTblock[64];

    /* bit parsing stuff */
    uint32_t bitstream_buf;	/* current 32 bit working set of buffer */
    int bitstream_bits;		/* used bits in working set */
    uint8_t * bitstream_ptr;	/* buffer with stream data */

    /* Motion vectors */
    /* The f_ and b_ correspond to the forward and backward motion */
    /* predictors */
    motion_t b_motion;
    motion_t f_motion;

    /* predictor for DC coefficients in intra blocks */
    int16_t dc_dct_pred[3];

    int quantizer_scale;	/* remove */
    int current_field;		/* remove */
    int v_offset;		/* remove */


    /* now non-slice-specific information */

    /* sequence header stuff */
    uint8_t intra_quantizer_matrix [64];
    uint8_t non_intra_quantizer_matrix [64];

    /* The width and height of the picture snapped to macroblock units */
    int coded_picture_width;
    int coded_picture_height;

    /* picture header stuff */

    /* what type of picture this is (I, P, B, D) */
    int picture_coding_type;
	
    /* picture coding extension stuff */
	
    /* quantization factor for intra dc coefficients */
    int intra_dc_precision;
    /* top/bottom/both fields */
    int picture_structure;
    /* bool to indicate all predictions are frame based */
    int frame_pred_frame_dct;
    /* bool to indicate whether intra blocks have motion vectors */
    /* (for concealment) */
    int concealment_motion_vectors;
    /* bit to indicate which quantization table to use */
    int q_scale_type;
    /* bool to use different vlc tables */
    int intra_vlc_format;
    /* used for DMV MC */
    int top_field_first;

    /* stuff derived from bitstream */

    /* pointer to the zigzag scan we're supposed to be using */
    uint8_t * scan;

    struct vo_frame_s * current_frame;
    struct vo_frame_s * forward_reference_frame;
    struct vo_frame_s * backward_reference_frame;

    int second_field;

    int mpeg1;

    /* these things are not needed by the decoder */
    /* this is a temporary interface, we will build a better one later. */
    int aspect_ratio_information;
    int frame_rate_code;
    int progressive_sequence;
    int repeat_first_field;
    int progressive_frame;
    int bitrate;
    
    // added by A'rpi/ESP-team
    int display_picture_width;
    int display_picture_height;
    int pp_options;
    int repeat_count;

    struct vo_frame_s * display_frame;
    int slice;

} picture_t;

typedef struct mpeg2_config_s {
    /* Bit flags that enable various things */
    uint32_t flags;
} mpeg2_config_t;

/* The only global variable, */
/* the config struct */
extern mpeg2_config_t config;



/* slice.c */
void header_state_init (picture_t * picture);
int header_process_picture_header (picture_t * picture, uint8_t * buffer);
int header_process_sequence_header (picture_t * picture, uint8_t * buffer);
int header_process_extension (picture_t * picture, uint8_t * buffer);

/* idct.c */
void idct_init (void);

/* idct_mlib.c */
void idct_block_copy_mlib (int16_t * block, uint8_t * dest, int stride);
void idct_block_add_mlib (int16_t * block, uint8_t * dest, int stride);

/* idct_mmx.c */
void idct_block_copy_mmxext (int16_t *block, uint8_t * dest, int stride);
void idct_block_add_mmxext (int16_t *block, uint8_t * dest, int stride);
void idct_block_copy_mmx (int16_t *block, uint8_t * dest, int stride);
void idct_block_add_mmx (int16_t *block, uint8_t * dest, int stride);
void idct_mmx_init (void);

/* motion_comp.c */
void motion_comp_init (void);

typedef struct mc_functions_s
{
    void (* put [8]) (uint8_t *dst, uint8_t *, int32_t, int32_t);
    void (* avg [8]) (uint8_t *dst, uint8_t *, int32_t, int32_t);
} mc_functions_t;

#define MOTION_COMP_EXTERN(x) mc_functions_t mc_functions_##x =		\
{									\
    {MC_put_16_##x, MC_put_x16_##x, MC_put_y16_##x, MC_put_xy16_##x,	\
     MC_put_8_##x,  MC_put_x8_##x,  MC_put_y8_##x,  MC_put_xy8_##x},	\
    {MC_avg_16_##x, MC_avg_x16_##x, MC_avg_y16_##x, MC_avg_xy16_##x,	\
     MC_avg_8_##x,  MC_avg_x8_##x,  MC_avg_y8_##x,  MC_avg_xy8_##x}	\
};

extern mc_functions_t mc_functions_c;
extern mc_functions_t mc_functions_mmx;
extern mc_functions_t mc_functions_mmxext;
extern mc_functions_t mc_functions_3dnow;
extern mc_functions_t mc_functions_mlib;

/* slice.c */
int slice_process (picture_t *picture, uint8_t code, uint8_t * buffer);

/* stats.c */
void stats_header (uint8_t code, uint8_t * buffer);

void mpeg2_allocate_image_buffers(picture_t * picture);


#ifdef MPEG12_POSTPROC
#define MBC 48
#define MBR 36
extern int quant_store[MBR+1][MBC+1]; // [Review]
#endif