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ffmpeg / libavcodec / mpegvideo.h @ 13b54752

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1 de6d9b64 Fabrice Bellard
/*
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 * Generic DCT based hybrid video encoder
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 * Copyright (c) 2000,2001 Gerard Lantau.
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program 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
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 */
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/* Macros for picture code type. */
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#define I_TYPE 1
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#define P_TYPE 2
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#define B_TYPE 3
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enum OutputFormat {
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    FMT_MPEG1,
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    FMT_H263,
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    FMT_MJPEG,
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};
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#define MPEG_BUF_SIZE (16 * 1024)
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typedef struct MpegEncContext {
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    /* the following parameters must be initialized before encoding */
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    int width, height; /* picture size. must be a multiple of 16 */
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    int gop_size;
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    int frame_rate; /* number of frames per second */
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    int intra_only; /* if true, only intra pictures are generated */
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    int bit_rate;        /* wanted bit rate */
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    enum OutputFormat out_format; /* output format */
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    int h263_plus; /* h263 plus headers */
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    int h263_rv10; /* use RV10 variation for H263 */
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    int h263_pred; /* use OpenDIVX (aka mpeg4) ac/dc predictions */
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    int h263_msmpeg4; /* generate MSMPEG4 compatible stream */
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    int h263_intel; /* use I263 intel h263 header */
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    int fixed_qscale; /* fixed qscale if non zero */
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    int encoding;     /* true if we are encoding (vs decoding) */
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    /* the following fields are managed internally by the encoder */
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    /* bit output */
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    PutBitContext pb;
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    /* sequence parameters */
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    int context_initialized;
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    int picture_number;
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    int fake_picture_number; /* picture number at the bitstream frame rate */
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    int gop_picture_number; /* index of the first picture of a GOP */
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    int mb_width, mb_height;
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    int linesize;              /* line size, in bytes, may be different from width */
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    UINT8 *new_picture[3];     /* picture to be compressed */
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    UINT8 *last_picture[3];    /* previous picture */
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    UINT8 *last_picture_base[3]; /* real start of the picture */
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    UINT8 *next_picture[3];    /* previous picture (for bidir pred) */
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    UINT8 *next_picture_base[3]; /* real start of the picture */
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    UINT8 *aux_picture[3];    /* aux picture (for B frames only) */
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    UINT8 *aux_picture_base[3]; /* real start of the picture */
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    UINT8 *current_picture[3]; /* buffer to store the decompressed current picture */
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    int last_dc[3]; /* last DC values for MPEG1 */
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    INT16 *dc_val[3]; /* used for mpeg4 DC prediction */
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    int y_dc_scale, c_dc_scale;
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    UINT8 *coded_block; /* used for coded block pattern prediction */
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    INT16 (*ac_val[3])[16]; /* used for for mpeg4 AC prediction */
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    int ac_pred;
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    int mb_skiped;              /* MUST BE SET only during DECODING */
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    UINT8 *mbskip_table;        /* used to avoid copy if macroblock
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                                   skipped (for black regions for example) */
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    int qscale;
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    int pict_type;
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    int frame_rate_index;
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    /* motion compensation */
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    int unrestricted_mv;
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    int h263_long_vectors; /* use horrible h263v1 long vector mode */
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    int f_code; /* resolution */
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    INT16 (*motion_val)[2]; /* used for MV prediction */
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    int full_search;
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    int mv_dir;
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#define MV_DIR_BACKWARD  1
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#define MV_DIR_FORWARD   2
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    int mv_type;
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#define MV_TYPE_16X16       0   /* 1 vector for the whole mb */
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#define MV_TYPE_8X8         1   /* 4 vectors (h263) */
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#define MV_TYPE_16X8        2   /* 2 vectors, one per 16x8 block */ 
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#define MV_TYPE_FIELD       3   /* 2 vectors, one per field */ 
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#define MV_TYPE_DMV         4   /* 2 vectors, special mpeg2 Dual Prime Vectors */
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    /* motion vectors for a macroblock 
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       first coordinate : 0 = forward 1 = backward
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       second "         : depend on type
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       third  "         : 0 = x, 1 = y
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    */
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    int mv[2][4][2];
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    int field_select[2][2];
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    int last_mv[2][2][2];
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    int has_b_frames;
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    int no_rounding; /* apply no rounding to motion estimation (MPEG4) */
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    /* macroblock layer */
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    int mb_x, mb_y;
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    int mb_incr;
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    int mb_intra;
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    /* matrix transmitted in the bitstream */
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    UINT16 intra_matrix[64];
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    UINT16 chroma_intra_matrix[64];
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    UINT16 non_intra_matrix[64];
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    UINT16 chroma_non_intra_matrix[64];
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    /* precomputed matrix (combine qscale and DCT renorm) */
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    int q_intra_matrix[64];
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    int q_non_intra_matrix[64];
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    int block_last_index[6];  /* last non zero coefficient in block */
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    void *opaque; /* private data for the user */
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    /* bit rate control */
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    int I_frame_bits;    /* wanted number of bits per I frame */
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    int P_frame_bits;    /* same for P frame */
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    long long wanted_bits;
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    long long total_bits;
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    /* mpeg4 specific */
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    int time_increment_bits;
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    /* RV10 specific */
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    int rv10_version; /* RV10 version: 0 or 3 */
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    int rv10_first_dc_coded[3];
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    /* MJPEG specific */
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    struct MJpegContext *mjpeg_ctx;
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    /* MSMPEG4 specific */
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    int mv_table_index;
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    int rl_table_index;
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    int rl_chroma_table_index;
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    int dc_table_index;
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    int use_skip_mb_code;
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    int slice_height;      /* in macroblocks */
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    int first_slice_line;  
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    /* decompression specific */
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    GetBitContext gb;
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    /* MPEG2 specific - I wish I had not to support this mess. */
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    int progressive_sequence;
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    int mpeg_f_code[2][2];
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    int picture_structure;
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/* picture type */
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#define PICT_TOP_FIELD     1
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#define PICT_BOTTOM_FIELD  2
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#define PICT_FRAME         3
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    int intra_dc_precision;
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    int frame_pred_frame_dct;
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    int top_field_first;
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    int concealment_motion_vectors;
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    int q_scale_type;
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    int intra_vlc_format;
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    int alternate_scan;
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    int repeat_first_field;
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    int chroma_420_type;
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    int progressive_frame;
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    int mpeg2;
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    int full_pel[2];
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    int interlaced_dct;
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    int last_qscale;
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    int first_slice;
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    DCTELEM block[6][64] __align8;
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    void (*dct_unquantize)(struct MpegEncContext *s, 
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                           DCTELEM *block, int n, int qscale);
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} MpegEncContext;
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//const 
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extern UINT8 zigzag_direct[64];
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int MPV_common_init(MpegEncContext *s);
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void MPV_common_end(MpegEncContext *s);
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void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64]);
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void MPV_frame_start(MpegEncContext *s);
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void MPV_frame_end(MpegEncContext *s);
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#ifdef HAVE_MMX
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void MPV_common_init_mmx(MpegEncContext *s);
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#endif
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/* motion_est.c */
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int estimate_motion(MpegEncContext *s, 
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                    int mb_x, int mb_y,
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                    int *mx_ptr, int *my_ptr);
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/* mpeg12.c */
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extern const UINT8 default_intra_matrix[64];
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extern const UINT8 default_non_intra_matrix[64];
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void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
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void mpeg1_encode_mb(MpegEncContext *s,
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                     DCTELEM block[6][64],
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                     int motion_x, int motion_y);
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/* h263enc.c */
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/* run length table */
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#define MAX_RUN    64
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#define MAX_LEVEL  64
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typedef struct RLTable {
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    int n; /* number of entries of table_vlc minus 1 */
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    int last; /* number of values for last = 0 */
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    const UINT16 (*table_vlc)[2];
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    const INT8 *table_run;
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    const INT8 *table_level;
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    UINT8 *index_run[2]; /* encoding only */
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    INT8 *max_level[2]; /* encoding & decoding */
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    INT8 *max_run[2];   /* encoding & decoding */
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    VLC vlc;            /* decoding only */
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} RLTable;
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void init_rl(RLTable *rl);
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void init_vlc_rl(RLTable *rl);
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extern inline int get_rl_index(const RLTable *rl, int last, int run, int level)
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{
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    int index;
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    index = rl->index_run[last][run];
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    if (index >= rl->n)
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        return rl->n;
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    if (level > rl->max_level[last][run])
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        return rl->n;
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    return index + level - 1;
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}
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void h263_encode_mb(MpegEncContext *s, 
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                    DCTELEM block[6][64],
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                    int motion_x, int motion_y);
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void h263_encode_picture_header(MpegEncContext *s, int picture_number);
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void h263_dc_scale(MpegEncContext *s);
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INT16 *h263_pred_motion(MpegEncContext * s, int block, 
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                        int *px, int *py);
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void mpeg4_pred_ac(MpegEncContext * s, INT16 *block, int n, 
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                   int dir);
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void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
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void h263_encode_init_vlc(MpegEncContext *s);
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void h263_decode_init_vlc(MpegEncContext *s);
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int h263_decode_picture_header(MpegEncContext *s);
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int mpeg4_decode_picture_header(MpegEncContext * s);
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int intel_h263_decode_picture_header(MpegEncContext *s);
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int h263_decode_mb(MpegEncContext *s,
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                   DCTELEM block[6][64]);
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int h263_get_picture_format(int width, int height);
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extern UINT8 ff_alternate_horizontal_scan[64];
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extern UINT8 ff_alternate_vertical_scan[64];
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/* rv10.c */
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void rv10_encode_picture_header(MpegEncContext *s, int picture_number);
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int rv_decode_dc(MpegEncContext *s, int n);
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/* msmpeg4.c */
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void msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number);
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void msmpeg4_encode_mb(MpegEncContext * s, 
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                       DCTELEM block[6][64],
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                       int motion_x, int motion_y);
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void msmpeg4_dc_scale(MpegEncContext * s);
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int msmpeg4_decode_picture_header(MpegEncContext * s);
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int msmpeg4_decode_mb(MpegEncContext *s, 
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                      DCTELEM block[6][64]);
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int msmpeg4_decode_init_vlc(MpegEncContext *s);
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/* mjpegenc.c */
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int mjpeg_init(MpegEncContext *s);
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void mjpeg_close(MpegEncContext *s);
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void mjpeg_encode_mb(MpegEncContext *s, 
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                     DCTELEM block[6][64]);
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void mjpeg_picture_header(MpegEncContext *s);
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void mjpeg_picture_trailer(MpegEncContext *s);