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ffmpeg / libavcodec / mpegvideo.h @ bb71e317

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/*
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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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#define S_TYPE 4 //S(GMC)-VOP MPEG4
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#define FRAME_SKIPED 100 // return value for header parsers if frame is not coded
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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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#define QMAT_SHIFT_MMX 19
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#define QMAT_SHIFT 25
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#define MAX_FCODE 7
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#define MAX_MV 2048
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#define REORDER_BUFFER_SIZE (FF_MAX_B_FRAMES+2)
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typedef struct Predictor{
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    double coeff;
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    double count;
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    double decay;
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} Predictor;
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typedef struct RateControlEntry{
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    int pict_type;
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    int qscale;
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    int mv_bits;
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    int i_tex_bits;
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    int p_tex_bits;
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    int misc_bits;
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    uint64_t expected_bits;
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    int new_pict_type;
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    float new_qscale;
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}RateControlEntry;
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typedef struct RateControlContext{
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    FILE *stats_file;
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    int num_entries;
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    RateControlEntry *entry;
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}RateControlContext;
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typedef struct ReorderBuffer{
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    UINT8 *picture[3];
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    int pict_type;
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    int qscale;
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    int force_type;
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    int picture_number;
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    int picture_in_gop_number;
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} ReorderBuffer;
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typedef struct MpegEncContext {
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    struct AVCodecContext *avctx;
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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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    int bit_rate_tolerance; /* amount of +- bits (>0)*/
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    enum OutputFormat out_format; /* output format */
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    int h263_pred;    /* use mpeg4/h263 ac/dc predictions */
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/* the following codec id fields are deprecated in favor of codec_id */
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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_msmpeg4; /* generate MSMPEG4 compatible stream (deprecated, use msmpeg4_version instead)*/
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    int h263_intel; /* use I263 intel h263 header */
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    int codec_id;     /* see CODEC_ID_xxx */
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    int fixed_qscale; /* fixed qscale if non zero */
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    float qcompress;  /* amount of qscale change between easy & hard scenes (0.0-1.0) */
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    float qblur;      /* amount of qscale smoothing over time (0.0-1.0) */
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    int qmin;         /* min qscale */
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    int qmax;         /* max qscale */
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    int max_qdiff;    /* max qscale difference between frames */
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    int encoding;     /* true if we are encoding (vs decoding) */
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    int flags;        /* AVCodecContext.flags (HQ, MV4, ...) */
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    int force_input_type;/* 0= no force, otherwise I_TYPE, P_TYPE, ... */
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    int max_b_frames; /* max number of b-frames for encoding */
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    float b_quant_factor;/* qscale factor between ips and b frames */
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    int rc_strategy;
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    int b_frame_strategy;
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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 input_picture_number;
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    int input_picture_in_gop_number; /* 0-> first pic in gop, ... */
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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 based on fake_pic_num & mpeg1 specific */
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    int picture_in_gop_number; /* 0-> first pic in gop, ... */
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    int b_frames_since_non_b;  /* used for encoding, relative to not yet reordered input */
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    int mb_width, mb_height;   /* number of MBs horizontally & vertically */
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    int mb_num;                /* number of MBs of a picture */
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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 *picture_buffer[REORDER_BUFFER_SIZE][3]; /* internal buffers used for reordering of input pictures */
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    int picture_buffer_index;
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    ReorderBuffer coded_order[REORDER_BUFFER_SIZE];
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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 num_available_buffers;   /* is 0 at the start & after seeking, after the first I frame its 1 after next I/P 2 */
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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, all 3 arrays must be continuous */
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    int y_dc_scale, c_dc_scale;
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    UINT8 *coded_block;          /* used for coded block pattern prediction (msmpeg4v3, wmv1)*/
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    INT16 (*ac_val[3])[16];      /* used for for mpeg4 AC prediction, all 3 arrays must be continuous */
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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 skipped (for black regions for example) 
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                                   and used for b-frame encoding & decoding (contains skip table of next P Frame) */
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    UINT8 *mbintra_table;       /* used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding */
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    int input_qscale;           /* qscale prior to reordering of frames */
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    int input_pict_type;        /* pict_type prior to reordering of frames */
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    int force_type;             /* 0= no force, otherwise I_TYPE, P_TYPE, ... */
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    int qscale;                 /* QP */
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    int last_non_b_qscale;        /* QP of last non b frame used for b frame qscale*/
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    int pict_type;              /* I_TYPE, P_TYPE, B_TYPE, ... */
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    int last_non_b_pict_type;   /* used for mpeg4 gmc b-frames & ratecontrol */
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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; /* forward MV resolution */
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    int b_code; /* backward MV resolution for B Frames (mpeg4) */
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    INT16 (*motion_val)[2];            /* used for MV prediction (4MV per MB) */
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    INT16 (*p_mv_table)[2];            /* MV table (1MV per MB) p-frame encoding */
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    INT16 (*last_p_mv_table)[2];       /* MV table (1MV per MB) p-frame encoding */
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    INT16 (*b_forw_mv_table)[2];       /* MV table (1MV per MB) forward mode b-frame encoding */
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    INT16 (*b_back_mv_table)[2];       /* MV table (1MV per MB) backward mode b-frame encoding */
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    INT16 (*b_bidir_forw_mv_table)[2]; /* MV table (1MV per MB) bidir mode b-frame encoding */
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    INT16 (*b_bidir_back_mv_table)[2]; /* MV table (1MV per MB) bidir mode b-frame encoding */
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    INT16 (*b_direct_forw_mv_table)[2];/* MV table (1MV per MB) direct mode b-frame encoding */
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    INT16 (*b_direct_back_mv_table)[2];/* MV table (1MV per MB) direct mode b-frame encoding */
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    INT16 (*b_direct_mv_table)[2];     /* MV table (1MV per MB) direct mode b-frame encoding */
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    int me_method;                     /* ME algorithm */
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    uint8_t *me_scratchpad;            /* data area for the me algo, so that the ME doesnt need to malloc/free */
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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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#define MV_DIRECT        4 // bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4)
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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, mpeg4 4MV) */
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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];             /* last MV, used for MV prediction in MPEG1 & B-frame MPEG4 */
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    UINT16 (*mv_penalty)[MAX_MV*2+1]; /* amount of bits needed to encode a MV, used for ME */
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    UINT8 *fcode_tab; /* smallest fcode needed for each MV */
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    int has_b_frames;
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    int no_rounding; /* apply no rounding to motion compensation (MPEG4, msmpeg4, ...) 
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                        for b-frames rounding mode is allways 0 */
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    int hurry_up;     /* when set to 1 during decoding, b frames will be skiped
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                         when set to 2 idct/dequant will be skipped too */
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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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    UINT16 *mb_var;    /* Table for MB variances */
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    UINT8 *mb_type;    /* Table for MB type */
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#define MB_TYPE_INTRA    0x01
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#define MB_TYPE_INTER    0x02
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#define MB_TYPE_INTER4V  0x04
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#define MB_TYPE_SKIPED   0x08
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#define MB_TYPE_DIRECT   0x10
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#define MB_TYPE_FORWARD  0x20
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#define MB_TYPE_BACKWARD 0x40
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#define MB_TYPE_BIDIR    0x80
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    int block_index[6]; /* index to current MB in block based arrays with edges*/
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    int block_wrap[6];
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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 inter_matrix[64];
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    UINT16 chroma_inter_matrix[64];
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#define QUANT_BIAS_SHIFT 4
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    int intra_quant_bias;    /* bias for the quantizer */
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    int inter_quant_bias;    /* bias for the quantizer */
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    int min_qcoeff;          /* minimum encodable coefficient */
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    int max_qcoeff;          /* maximum encodable coefficient */
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    /* precomputed matrix (combine qscale and DCT renorm) */
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    int q_intra_matrix[32][64];
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    int q_inter_matrix[32][64];
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    /* identical to the above but for MMX & these are not permutated */
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    UINT16 __align8 q_intra_matrix16[32][64];
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    UINT16 __align8 q_inter_matrix16[32][64];
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    UINT16 __align8 q_intra_matrix16_bias[32][64];
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    UINT16 __align8 q_inter_matrix16_bias[32][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; //FIXME used in mpeg12 ...
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    int avg_mb_var;        /* average MB variance for current frame */
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    int mc_mb_var;         /* motion compensated MB variance for current frame */
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    int last_non_b_mc_mb_var;/* motion compensated MB variance for last non b frame */
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    INT64 wanted_bits;
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    INT64 total_bits;
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    int frame_bits;        /* bits used for the current frame */
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    int pb_frame_bits;     /* bits of the last b...bp group */
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    Predictor i_pred;
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    Predictor p_pred;
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    double qsum;         /* sum of qscales */
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    double qcount;       /* count of qscales */
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    double short_term_qsum;   /* sum of recent qscales */
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    double short_term_qcount; /* count of recent qscales */
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    RateControlContext rc_context;
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    /* statistics, used for 2-pass encoding */
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    int mv_bits;
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    int header_bits;
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    int i_tex_bits;
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    int p_tex_bits;
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    int i_count;
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    int p_count;
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    int skip_count;
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    int misc_bits; // cbp, mb_type
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    int last_bits; //temp var used for calculating the above vars
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    /* H.263 specific */
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    int gob_number;
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    int gob_index;
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    int first_gob_line;
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    /* H.263+ specific */
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    int umvplus;
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    int umvplus_dec;
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    int h263_aic; /* Advanded INTRA Coding (AIC) */
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    int h263_aic_dir; /* AIC direction: 0 = left, 1 = top */
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    /* mpeg4 specific */
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    int time_increment_resolution;
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    int time_increment_bits;        /* number of bits to represent the fractional part of time */
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    int last_time_base;
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    int time_base;                  /* time in seconds of last I,P,S Frame */
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    int64_t time;                   /* time of current frame */ 
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    int64_t last_non_b_time;
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    uint16_t pp_time;               /* time distance between the last 2 p,s,i frames */
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    uint16_t bp_time;               /* time distance between the last b and p,s,i frame */
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    int shape;
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    int vol_sprite_usage;
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    int sprite_width;
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    int sprite_height;
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    int sprite_left;
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    int sprite_top;
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    int sprite_brightness_change;
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    int num_sprite_warping_points;
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    int real_sprite_warping_points;
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    int sprite_offset[2][2];
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    int sprite_delta[2][2][2];
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    int sprite_shift[2][2];
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    int mcsel;
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    int quant_precision;
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    int quarter_sample;              /* 1->qpel, 0->half pel ME/MC */ 
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    int scalability;
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    int new_pred;
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    int reduced_res_vop;
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    int aspect_ratio_info;
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    int sprite_warping_accuracy;
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    int low_latency_sprite;
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    int data_partioning;
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    int resync_marker;
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    int resync_x_pos;
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    int low_delay;                   /* no reordering needed / has no b-frames */
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    int vo_type;
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    /* divx specific, used to workaround (many) bugs in divx5 */
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    int divx_version;
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    int divx_build;
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#define BITSTREAM_BUFFER_SIZE 1024*256
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    uint8_t *bitstream_buffer; //Divx 5.01 puts several frames in a single one, this is used to reorder them
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    int bitstream_buffer_size;
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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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    int mjpeg_vsample[3]; /* vertical sampling factors, default = {2, 1, 1} */
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    int mjpeg_hsample[3]; /* horizontal sampling factors, default = {2, 1, 1} */
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    int mjpeg_write_tables; /* do we want to have quantisation- and
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                               huffmantables in the jpeg file ? */
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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;  /* used in mpeg4 too to handle resync markers */
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    int flipflop_rounding;
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    int bitrate;
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    int msmpeg4_version;   /* 0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 */
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    /* decompression specific */
347
    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;
359
    int frame_pred_frame_dct;
360
    int top_field_first;
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    int concealment_motion_vectors;
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    int q_scale_type;
363
    int intra_vlc_format;
364
    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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374
    /* RTP specific */
375
    /* These are explained on avcodec.h */
376
    int rtp_mode;
377
    int rtp_payload_size;
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    void (*rtp_callback)(void *data, int size, int packet_number);
379
    UINT8 *ptr_lastgob;
380
    UINT8 *ptr_last_mb_line;
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    UINT32 mb_line_avgsize;
382
    
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    DCTELEM (*block)[64]; /* points to one of the following blocks */
384
    DCTELEM blocks[2][6][64] __align8; // for HQ mode we need to keep the best block
385
    void (*dct_unquantize_mpeg1)(struct MpegEncContext *s, 
386
                           DCTELEM *block, int n, int qscale);
387
    void (*dct_unquantize_mpeg2)(struct MpegEncContext *s, 
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                           DCTELEM *block, int n, int qscale);
389
    void (*dct_unquantize_h263)(struct MpegEncContext *s, 
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                           DCTELEM *block, int n, int qscale);
391
    void (*dct_unquantize)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)
392
                           DCTELEM *block, int n, int qscale);
393
} MpegEncContext;
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395
int MPV_common_init(MpegEncContext *s);
396
void MPV_common_end(MpegEncContext *s);
397
void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64]);
398
void MPV_frame_start(MpegEncContext *s);
399
void MPV_frame_end(MpegEncContext *s);
400
#ifdef HAVE_MMX
401
void MPV_common_init_mmx(MpegEncContext *s);
402
#endif
403
int (*dct_quantize)(MpegEncContext *s, DCTELEM *block, int n, int qscale, int *overflow);
404
void (*draw_edges)(UINT8 *buf, int wrap, int width, int height, int w);
405

    
406
/* motion_est.c */
407
void ff_estimate_p_frame_motion(MpegEncContext * s,
408
                             int mb_x, int mb_y);
409
void ff_estimate_b_frame_motion(MpegEncContext * s,
410
                             int mb_x, int mb_y);
411
int ff_get_best_fcode(MpegEncContext * s, int16_t (*mv_table)[2], int type);
412
void ff_fix_long_p_mvs(MpegEncContext * s);
413
void ff_fix_long_b_mvs(MpegEncContext * s, int16_t (*mv_table)[2], int f_code, int type);
414

    
415
/* mpeg12.c */
416
extern INT16 default_intra_matrix[64];
417
extern INT16 default_non_intra_matrix[64];
418

    
419
void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
420
void mpeg1_encode_mb(MpegEncContext *s,
421
                     DCTELEM block[6][64],
422
                     int motion_x, int motion_y);
423
void mpeg1_encode_init(MpegEncContext *s);
424

    
425
/* h263enc.c */
426

    
427
/* run length table */
428
#define MAX_RUN    64
429
#define MAX_LEVEL  64
430

    
431
typedef struct RLTable {
432
    int n; /* number of entries of table_vlc minus 1 */
433
    int last; /* number of values for last = 0 */
434
    const UINT16 (*table_vlc)[2];
435
    const INT8 *table_run;
436
    const INT8 *table_level;
437
    UINT8 *index_run[2]; /* encoding only */
438
    INT8 *max_level[2]; /* encoding & decoding */
439
    INT8 *max_run[2];   /* encoding & decoding */
440
    VLC vlc;            /* decoding only */
441
} RLTable;
442

    
443
void init_rl(RLTable *rl);
444
void init_vlc_rl(RLTable *rl);
445

    
446
static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
447
{
448
    int index;
449
    index = rl->index_run[last][run];
450
    if (index >= rl->n)
451
        return rl->n;
452
    if (level > rl->max_level[last][run])
453
        return rl->n;
454
    return index + level - 1;
455
}
456

    
457
void h263_encode_mb(MpegEncContext *s, 
458
                    DCTELEM block[6][64],
459
                    int motion_x, int motion_y);
460
void mpeg4_encode_mb(MpegEncContext *s, 
461
                    DCTELEM block[6][64],
462
                    int motion_x, int motion_y);
463
void h263_encode_picture_header(MpegEncContext *s, int picture_number);
464
int h263_encode_gob_header(MpegEncContext * s, int mb_line);
465
void h263_dc_scale(MpegEncContext *s);
466
INT16 *h263_pred_motion(MpegEncContext * s, int block, 
467
                        int *px, int *py);
468
void mpeg4_pred_ac(MpegEncContext * s, INT16 *block, int n, 
469
                   int dir);
470
void ff_set_mpeg4_time(MpegEncContext * s, int picture_number);
471
void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);
472
void h263_encode_init(MpegEncContext *s);
473

    
474
void h263_decode_init_vlc(MpegEncContext *s);
475
int h263_decode_picture_header(MpegEncContext *s);
476
int h263_decode_gob_header(MpegEncContext *s);
477
int mpeg4_decode_picture_header(MpegEncContext * s);
478
int intel_h263_decode_picture_header(MpegEncContext *s);
479
int h263_decode_mb(MpegEncContext *s,
480
                   DCTELEM block[6][64]);
481
int h263_get_picture_format(int width, int height);
482

    
483
/* rv10.c */
484
void rv10_encode_picture_header(MpegEncContext *s, int picture_number);
485
int rv_decode_dc(MpegEncContext *s, int n);
486

    
487
/* msmpeg4.c */
488
void msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number);
489
void msmpeg4_encode_ext_header(MpegEncContext * s);
490
void msmpeg4_encode_mb(MpegEncContext * s, 
491
                       DCTELEM block[6][64],
492
                       int motion_x, int motion_y);
493
int msmpeg4_decode_picture_header(MpegEncContext * s);
494
int msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);
495
int msmpeg4_decode_mb(MpegEncContext *s, 
496
                      DCTELEM block[6][64]);
497
int msmpeg4_decode_init_vlc(MpegEncContext *s);
498

    
499
/* mjpegenc.c */
500

    
501
int mjpeg_init(MpegEncContext *s);
502
void mjpeg_close(MpegEncContext *s);
503
void mjpeg_encode_mb(MpegEncContext *s, 
504
                     DCTELEM block[6][64]);
505
void mjpeg_picture_header(MpegEncContext *s);
506
void mjpeg_picture_trailer(MpegEncContext *s);
507

    
508
/* rate control */
509
int ff_rate_control_init(MpegEncContext *s);
510
int ff_rate_estimate_qscale(MpegEncContext *s);
511
int ff_rate_estimate_qscale_pass2(MpegEncContext *s);
512
void ff_write_pass1_stats(MpegEncContext *s);
513
void ff_rate_control_uninit(MpegEncContext *s);
514

    
515

    
516

    
517