PeerStreamer

/*

 * Generic DCT based hybrid video encoder

 * Copyright (c) 2000,2001 Gerard Lantau.

 *

 * This program 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.

 *

 * This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

/* Macros for picture code type. */

#define I_TYPE 1

#define P_TYPE 2

#define B_TYPE 3

enum OutputFormat {

    FMT_MPEG1,

    FMT_H263,

    FMT_MJPEG,

};

#define MPEG_BUF_SIZE (16 * 1024)

#define QMAT_SHIFT_MMX 19

#define QMAT_SHIFT 25

typedef struct MpegEncContext {

    struct AVCodecContext *avctx;

    /* the following parameters must be initialized before encoding */

    int width, height; /* picture size. must be a multiple of 16 */

    int gop_size;

    int frame_rate; /* number of frames per second */

    int intra_only; /* if true, only intra pictures are generated */

    int bit_rate;        /* wanted bit rate */

    enum OutputFormat out_format; /* output format */

    int h263_plus; /* h263 plus headers */

    int h263_rv10; /* use RV10 variation for H263 */

    int h263_pred; /* use mpeg4/h263 ac/dc predictions */

    int h263_msmpeg4; /* generate MSMPEG4 compatible stream */

    int h263_intel; /* use I263 intel h263 header */

    int fixed_qscale; /* fixed qscale if non zero */

    int encoding;     /* true if we are encoding (vs decoding) */

    /* the following fields are managed internally by the encoder */

    /* bit output */

    PutBitContext pb;

    /* sequence parameters */

    int context_initialized;

    int picture_number;

    int fake_picture_number; /* picture number at the bitstream frame rate */

    int gop_picture_number; /* index of the first picture of a GOP */

    int mb_width, mb_height;

    int linesize;              /* line size, in bytes, may be different from width */

    UINT8 *new_picture[3];     /* picture to be compressed */

    UINT8 *last_picture[3];    /* previous picture */

    UINT8 *last_picture_base[3]; /* real start of the picture */

    UINT8 *next_picture[3];    /* previous picture (for bidir pred) */

    UINT8 *next_picture_base[3]; /* real start of the picture */

    UINT8 *aux_picture[3];    /* aux picture (for B frames only) */

    UINT8 *aux_picture_base[3]; /* real start of the picture */

    UINT8 *current_picture[3]; /* buffer to store the decompressed current picture */

    int last_dc[3]; /* last DC values for MPEG1 */

    INT16 *dc_val[3]; /* used for mpeg4 DC prediction */

    int y_dc_scale, c_dc_scale;

    UINT8 *coded_block; /* used for coded block pattern prediction */

    INT16 (*ac_val[3])[16]; /* used for for mpeg4 AC prediction */

    int ac_pred;

    int mb_skiped;              /* MUST BE SET only during DECODING */

    UINT8 *mbskip_table;        /* used to avoid copy if macroblock

                                   skipped (for black regions for example) */

    UINT8 *mbintra_table;            /* used to kill a few memsets */

    int qscale;

    int pict_type;

    int frame_rate_index;

    /* motion compensation */

    int unrestricted_mv;

    int h263_long_vectors; /* use horrible h263v1 long vector mode */

    int f_code; /* resolution */

    INT16 (*motion_val)[2]; /* used for MV prediction */

    int full_search;

    int mv_dir;

#define MV_DIR_BACKWARD  1

#define MV_DIR_FORWARD   2

    int mv_type;

#define MV_TYPE_16X16       0   /* 1 vector for the whole mb */

#define MV_TYPE_8X8         1   /* 4 vectors (h263) */

#define MV_TYPE_16X8        2   /* 2 vectors, one per 16x8 block */ 

#define MV_TYPE_FIELD       3   /* 2 vectors, one per field */ 

#define MV_TYPE_DMV         4   /* 2 vectors, special mpeg2 Dual Prime Vectors */

    /* motion vectors for a macroblock 

       first coordinate : 0 = forward 1 = backward

       second "         : depend on type

       third  "         : 0 = x, 1 = y

    */

    int mv[2][4][2];

    int field_select[2][2];

    int last_mv[2][2][2];

    int has_b_frames;

    int no_rounding; /* apply no rounding to motion estimation (MPEG4) */

    /* macroblock layer */

    int mb_x, mb_y;

    int mb_incr;

    int mb_intra;

    /* matrix transmitted in the bitstream */

    UINT16 intra_matrix[64];

    UINT16 chroma_intra_matrix[64];

    UINT16 non_intra_matrix[64];

    UINT16 chroma_non_intra_matrix[64];

    /* precomputed matrix (combine qscale and DCT renorm) */

    int q_intra_matrix[64];

    int q_non_intra_matrix[64];

    /* identical to the above but for MMX & these are not permutated */

    UINT16 __align8 q_intra_matrix16[64] ;

    UINT16 __align8 q_non_intra_matrix16[64];

    int block_last_index[6];  /* last non zero coefficient in block */

    void *opaque; /* private data for the user */

    /* bit rate control */

    int I_frame_bits;    /* wanted number of bits per I frame */

    int P_frame_bits;    /* same for P frame */

    INT64 wanted_bits;

    INT64 total_bits;

    /* H.263 specific */

    int gob_number;

    int gob_index;

    int first_gob_line;

    /* H.263+ specific */

    int umvplus;

    int umvplus_dec;

    /* mpeg4 specific */

    int time_increment_bits;

    int shape;

    int vol_sprite_usage;

    int quant_precision;

    /* RV10 specific */

    int rv10_version; /* RV10 version: 0 or 3 */

    int rv10_first_dc_coded[3];

    /* MJPEG specific */

    struct MJpegContext *mjpeg_ctx;

    /* MSMPEG4 specific */

    int mv_table_index;

    int rl_table_index;

    int rl_chroma_table_index;

    int dc_table_index;

    int use_skip_mb_code;

    int slice_height;      /* in macroblocks */

    int first_slice_line;  

    int flipflop_rounding;

    int bitrate;

    /* decompression specific */

    GetBitContext gb;

    /* MPEG2 specific - I wish I had not to support this mess. */

    int progressive_sequence;

    int mpeg_f_code[2][2];

    int picture_structure;

/* picture type */

#define PICT_TOP_FIELD     1

#define PICT_BOTTOM_FIELD  2

#define PICT_FRAME         3

    int intra_dc_precision;

    int frame_pred_frame_dct;

    int top_field_first;

    int concealment_motion_vectors;

    int q_scale_type;

    int intra_vlc_format;

    int alternate_scan;

    int repeat_first_field;

    int chroma_420_type;

    int progressive_frame;

    int mpeg2;

    int full_pel[2];

    int interlaced_dct;

    int last_qscale;

    int first_slice;

    /* RTP specific */

    int rtp_mode;

    int rtp_payload_size;

    UINT8 *ptr_lastgob;

    UINT8 *ptr_last_mb_line;

    UINT32 mb_line_avgsize;

    DCTELEM block[6][64] __align8;

    void (*dct_unquantize)(struct MpegEncContext *s, 

                           DCTELEM *block, int n, int qscale);

} MpegEncContext;

int MPV_common_init(MpegEncContext *s);

void MPV_common_end(MpegEncContext *s);

void MPV_decode_mb(MpegEncContext *s, DCTELEM block[6][64]);

void MPV_frame_start(MpegEncContext *s);

void MPV_frame_end(MpegEncContext *s);

#ifdef HAVE_MMX

void MPV_common_init_mmx(MpegEncContext *s);

#endif

/* motion_est.c */

int estimate_motion(MpegEncContext *s, 

                    int mb_x, int mb_y,

                    int *mx_ptr, int *my_ptr);

/* mpeg12.c */

extern INT16 default_intra_matrix[64];

extern INT16 default_non_intra_matrix[64];

void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);

void mpeg1_encode_mb(MpegEncContext *s,

                     DCTELEM block[6][64],

                     int motion_x, int motion_y);

/* h263enc.c */

/* run length table */

#define MAX_RUN    64

#define MAX_LEVEL  64

typedef struct RLTable {

    int n; /* number of entries of table_vlc minus 1 */

    int last; /* number of values for last = 0 */

    const UINT16 (*table_vlc)[2];

    const INT8 *table_run;

    const INT8 *table_level;

    UINT8 *index_run[2]; /* encoding only */

    INT8 *max_level[2]; /* encoding & decoding */

    INT8 *max_run[2];   /* encoding & decoding */

    VLC vlc;            /* decoding only */

} RLTable;

void init_rl(RLTable *rl);

void init_vlc_rl(RLTable *rl);

extern inline int get_rl_index(const RLTable *rl, int last, int run, int level)

{

    int index;

    index = rl->index_run[last][run];

    if (index >= rl->n)

        return rl->n;

    if (level > rl->max_level[last][run])

        return rl->n;

    return index + level - 1;

}

void h263_encode_mb(MpegEncContext *s, 

                    DCTELEM block[6][64],

                    int motion_x, int motion_y);

void h263_encode_picture_header(MpegEncContext *s, int picture_number);

int h263_encode_gob_header(MpegEncContext * s, int mb_line);

void h263_dc_scale(MpegEncContext *s);

INT16 *h263_pred_motion(MpegEncContext * s, int block, 

                        int *px, int *py);

void mpeg4_pred_ac(MpegEncContext * s, INT16 *block, int n, 

                   int dir);

void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);

void h263_encode_init_vlc(MpegEncContext *s);

void h263_decode_init_vlc(MpegEncContext *s);

int h263_decode_picture_header(MpegEncContext *s);

int h263_decode_gob_header(MpegEncContext *s);

int mpeg4_decode_picture_header(MpegEncContext * s);

int intel_h263_decode_picture_header(MpegEncContext *s);

int h263_decode_mb(MpegEncContext *s,

                   DCTELEM block[6][64]);

int h263_get_picture_format(int width, int height);

/* rv10.c */

void rv10_encode_picture_header(MpegEncContext *s, int picture_number);

int rv_decode_dc(MpegEncContext *s, int n);

/* msmpeg4.c */

void msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number);

void msmpeg4_encode_ext_header(MpegEncContext * s);

void msmpeg4_encode_mb(MpegEncContext * s, 

                       DCTELEM block[6][64],

                       int motion_x, int motion_y);

void msmpeg4_dc_scale(MpegEncContext * s);

int msmpeg4_decode_picture_header(MpegEncContext * s);

int msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);

int msmpeg4_decode_mb(MpegEncContext *s, 

                      DCTELEM block[6][64]);

int msmpeg4_decode_init_vlc(MpegEncContext *s);

/* mjpegenc.c */

int mjpeg_init(MpegEncContext *s);

void mjpeg_close(MpegEncContext *s);

void mjpeg_encode_mb(MpegEncContext *s, 

                     DCTELEM block[6][64]);

void mjpeg_picture_header(MpegEncContext *s);

void mjpeg_picture_trailer(MpegEncContext *s);