PeerStreamer

/*

 * Generic DCT based hybrid video encoder

 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard

 * Copyright (c) 2002-2004 Michael Niedermayer

 *

 * 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

 */

/**

 * @file libavcodec/mpegvideo.h

 * mpegvideo header.

 */

#ifndef AVCODEC_MPEGVIDEO_H

#define AVCODEC_MPEGVIDEO_H

#include "dsputil.h"

#include "get_bits.h"

#include "put_bits.h"

#include "ratecontrol.h"

#include "parser.h"

#include "mpeg12data.h"

#include "rl.h"

#define FRAME_SKIPPED 100 ///< return value for header parsers if frame is not coded

enum OutputFormat {

    FMT_MPEG1,

    FMT_H261,

    FMT_H263,

    FMT_MJPEG,

    FMT_H264,

};

#define MPEG_BUF_SIZE (16 * 1024)

#define QMAT_SHIFT_MMX 16

#define QMAT_SHIFT 22

#define MAX_FCODE 7

#define MAX_MV 2048

#define MAX_THREADS 8

#define MAX_PICTURE_COUNT 32

#define ME_MAP_SIZE 64

#define ME_MAP_SHIFT 3

#define ME_MAP_MV_BITS 11

#define MAX_MB_BYTES (30*16*16*3/8 + 120)

#define INPLACE_OFFSET 16

/* Start codes. */

#define SEQ_END_CODE            0x000001b7

#define SEQ_START_CODE          0x000001b3

#define GOP_START_CODE          0x000001b8

#define PICTURE_START_CODE      0x00000100

#define SLICE_MIN_START_CODE    0x00000101

#define SLICE_MAX_START_CODE    0x000001af

#define EXT_START_CODE          0x000001b5

#define USER_START_CODE         0x000001b2

/**

 * Picture.

 */

typedef struct Picture{

    FF_COMMON_FRAME

    /**

     * halfpel luma planes.

     */

    uint8_t *interpolated[3];

    int16_t (*motion_val_base[2])[2];

    uint32_t *mb_type_base;

#define MB_TYPE_INTRA MB_TYPE_INTRA4x4 //default mb_type if there is just one type

#define IS_INTRA4x4(a)   ((a)&MB_TYPE_INTRA4x4)

#define IS_INTRA16x16(a) ((a)&MB_TYPE_INTRA16x16)

#define IS_PCM(a)        ((a)&MB_TYPE_INTRA_PCM)

#define IS_INTRA(a)      ((a)&7)

#define IS_INTER(a)      ((a)&(MB_TYPE_16x16|MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8))

#define IS_SKIP(a)       ((a)&MB_TYPE_SKIP)

#define IS_INTRA_PCM(a)  ((a)&MB_TYPE_INTRA_PCM)

#define IS_INTERLACED(a) ((a)&MB_TYPE_INTERLACED)

#define IS_DIRECT(a)     ((a)&MB_TYPE_DIRECT2)

#define IS_GMC(a)        ((a)&MB_TYPE_GMC)

#define IS_16X16(a)      ((a)&MB_TYPE_16x16)

#define IS_16X8(a)       ((a)&MB_TYPE_16x8)

#define IS_8X16(a)       ((a)&MB_TYPE_8x16)

#define IS_8X8(a)        ((a)&MB_TYPE_8x8)

#define IS_SUB_8X8(a)    ((a)&MB_TYPE_16x16) //note reused

#define IS_SUB_8X4(a)    ((a)&MB_TYPE_16x8)  //note reused

#define IS_SUB_4X8(a)    ((a)&MB_TYPE_8x16)  //note reused

#define IS_SUB_4X4(a)    ((a)&MB_TYPE_8x8)   //note reused

#define IS_ACPRED(a)     ((a)&MB_TYPE_ACPRED)

#define IS_QUANT(a)      ((a)&MB_TYPE_QUANT)

#define IS_DIR(a, part, list) ((a) & (MB_TYPE_P0L0<<((part)+2*(list))))

#define USES_LIST(a, list) ((a) & ((MB_TYPE_P0L0|MB_TYPE_P1L0)<<(2*(list)))) ///< does this mb use listX, note does not work if subMBs

#define HAS_CBP(a)        ((a)&MB_TYPE_CBP)

    int field_poc[2];           ///< h264 top/bottom POC

    int poc;                    ///< h264 frame POC

    int frame_num;              ///< h264 frame_num (raw frame_num from slice header)

    int pic_id;                 /**< h264 pic_num (short -> no wrap version of pic_num,

                                     pic_num & max_pic_num; long -> long_pic_num) */

    int long_ref;               ///< 1->long term reference 0->short term reference

    int ref_poc[2][2][16];      ///< h264 POCs of the frames used as reference (FIXME need per slice)

    int ref_count[2][2];        ///< number of entries in ref_poc              (FIXME need per slice)

    int mbaff;                  ///< h264 1 -> MBAFF frame 0-> not MBAFF

    int mb_var_sum;             ///< sum of MB variance for current frame

    int mc_mb_var_sum;          ///< motion compensated MB variance for current frame

    uint16_t *mb_var;           ///< Table for MB variances

    uint16_t *mc_mb_var;        ///< Table for motion compensated MB variances

    uint8_t *mb_mean;           ///< Table for MB luminance

    int32_t *mb_cmp_score;      ///< Table for MB cmp scores, for mb decision FIXME remove

    int b_frame_score;          /* */

} Picture;

struct MpegEncContext;

/**

 * Motion estimation context.

 */

typedef struct MotionEstContext{

    AVCodecContext *avctx;

    int skip;                          ///< set if ME is skipped for the current MB

    int co_located_mv[4][2];           ///< mv from last P-frame for direct mode ME

    int direct_basis_mv[4][2];

    uint8_t *scratchpad;               ///< data area for the ME algo, so that the ME does not need to malloc/free

    uint8_t *best_mb;

    uint8_t *temp_mb[2];

    uint8_t *temp;

    int best_bits;

    uint32_t *map;                     ///< map to avoid duplicate evaluations

    uint32_t *score_map;               ///< map to store the scores

    int map_generation;

    int pre_penalty_factor;

    int penalty_factor;                /*!< an estimate of the bits required to

                                        code a given mv value, e.g. (1,0) takes

                                        more bits than (0,0). We have to

                                        estimate whether any reduction in

                                        residual is worth the extra bits. */

    int sub_penalty_factor;

    int mb_penalty_factor;

    int flags;

    int sub_flags;

    int mb_flags;

    int pre_pass;                      ///< = 1 for the pre pass

    int dia_size;

    int xmin;

    int xmax;

    int ymin;

    int ymax;

    int pred_x;

    int pred_y;

    uint8_t *src[4][4];

    uint8_t *ref[4][4];

    int stride;

    int uvstride;

    /* temp variables for picture complexity calculation */

    int mc_mb_var_sum_temp;

    int mb_var_sum_temp;

    int scene_change_score;

/*    cmp, chroma_cmp;*/

    op_pixels_func (*hpel_put)[4];

    op_pixels_func (*hpel_avg)[4];

    qpel_mc_func (*qpel_put)[16];

    qpel_mc_func (*qpel_avg)[16];

    uint8_t (*mv_penalty)[MAX_MV*2+1];  ///< amount of bits needed to encode a MV

    uint8_t *current_mv_penalty;

    int (*sub_motion_search)(struct MpegEncContext * s,

                                  int *mx_ptr, int *my_ptr, int dmin,

                                  int src_index, int ref_index,

                                  int size, int h);

}MotionEstContext;

/**

 * MpegEncContext.

 */

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 intra_only;   ///< if true, only intra pictures are generated

    int bit_rate;     ///< wanted bit rate

    enum OutputFormat out_format; ///< output format

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

    int pb_frame;     ///< PB frame mode (0 = none, 1 = base, 2 = improved)

/* the following codec id fields are deprecated in favor of codec_id */

    int h263_plus;    ///< h263 plus headers

    int h263_msmpeg4; ///< generate MSMPEG4 compatible stream (deprecated, use msmpeg4_version instead)

    int h263_flv;     ///< use flv h263 header

    enum CodecID codec_id;     /* see CODEC_ID_xxx */

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

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

    int flags;        ///< AVCodecContext.flags (HQ, MV4, ...)

    int flags2;       ///< AVCodecContext.flags2

    int max_b_frames; ///< max number of b-frames for encoding

    int luma_elim_threshold;

    int chroma_elim_threshold;

    int strict_std_compliance; ///< strictly follow the std (MPEG4, ...)

    int workaround_bugs;       ///< workaround bugs in encoders which cannot be detected automatically

    int codec_tag;             ///< internal codec_tag upper case converted from avctx codec_tag

    int stream_codec_tag;      ///< internal stream_codec_tag upper case converted from avctx stream_codec_tag

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

    /** bit output */

    PutBitContext pb;

    /* sequence parameters */

    int context_initialized;

    int input_picture_number;  ///< used to set pic->display_picture_number, should not be used for/by anything else

    int coded_picture_number;  ///< used to set pic->coded_picture_number, should not be used for/by anything else

    int picture_number;       //FIXME remove, unclear definition

    int picture_in_gop_number; ///< 0-> first pic in gop, ...

    int b_frames_since_non_b;  ///< used for encoding, relative to not yet reordered input

    int64_t user_specified_pts;///< last non zero pts from AVFrame which was passed into avcodec_encode_video()

    int mb_width, mb_height;   ///< number of MBs horizontally & vertically

    int mb_stride;             ///< mb_width+1 used for some arrays to allow simple addressing of left & top MBs without sig11

    int b8_stride;             ///< 2*mb_width+1 used for some 8x8 block arrays to allow simple addressing

    int b4_stride;             ///< 4*mb_width+1 used for some 4x4 block arrays to allow simple addressing

    int h_edge_pos, v_edge_pos;///< horizontal / vertical position of the right/bottom edge (pixel replication)

    int mb_num;                ///< number of MBs of a picture

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

    int uvlinesize;            ///< line size, for chroma in bytes, may be different from width

    Picture *picture;          ///< main picture buffer

    Picture **input_picture;   ///< next pictures on display order for encoding

    Picture **reordered_input_picture; ///< pointer to the next pictures in codedorder for encoding

    int start_mb_y;            ///< start mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)

    int end_mb_y;              ///< end   mb_y of this thread (so current thread should process start_mb_y <= row < end_mb_y)

    struct MpegEncContext *thread_context[MAX_THREADS];

    /**

     * copy of the previous picture structure.

     * note, linesize & data, might not match the previous picture (for field pictures)

     */

    Picture last_picture;

    /**

     * copy of the next picture structure.

     * note, linesize & data, might not match the next picture (for field pictures)

     */

    Picture next_picture;

    /**

     * copy of the source picture structure for encoding.

     * note, linesize & data, might not match the source picture (for field pictures)

     */

    Picture new_picture;

    /**

     * copy of the current picture structure.

     * note, linesize & data, might not match the current picture (for field pictures)

     */

    Picture current_picture;    ///< buffer to store the decompressed current picture

    Picture *last_picture_ptr;     ///< pointer to the previous picture.

    Picture *next_picture_ptr;     ///< pointer to the next picture (for bidir pred)

    Picture *current_picture_ptr;  ///< pointer to the current picture

    uint8_t *visualization_buffer[3]; //< temporary buffer vor MV visualization

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

    int16_t *dc_val_base;

    int16_t *dc_val[3];            ///< used for mpeg4 DC prediction, all 3 arrays must be continuous

    int16_t dc_cache[4*5];

    int y_dc_scale, c_dc_scale;

    const uint8_t *y_dc_scale_table;     ///< qscale -> y_dc_scale table

    const uint8_t *c_dc_scale_table;     ///< qscale -> c_dc_scale table

    const uint8_t *chroma_qscale_table;  ///< qscale -> chroma_qscale (h263)

    uint8_t *coded_block_base;

    uint8_t *coded_block;          ///< used for coded block pattern prediction (msmpeg4v3, wmv1)

    int16_t (*ac_val_base)[16];

    int16_t (*ac_val[3])[16];      ///< used for for mpeg4 AC prediction, all 3 arrays must be continuous

    int ac_pred;

    uint8_t *prev_pict_types;     ///< previous picture types in bitstream order, used for mb skip

#define PREV_PICT_TYPES_BUFFER_SIZE 256

    int mb_skipped;                ///< MUST BE SET only during DECODING

    uint8_t *mbskip_table;        /**< used to avoid copy if macroblock skipped (for black regions for example)

                                   and used for b-frame encoding & decoding (contains skip table of next P Frame) */

    uint8_t *mbintra_table;       ///< used to avoid setting {ac, dc, cbp}-pred stuff to zero on inter MB decoding

    uint8_t *cbp_table;           ///< used to store cbp, ac_pred for partitioned decoding

    uint8_t *pred_dir_table;      ///< used to store pred_dir for partitioned decoding

    uint8_t *allocated_edge_emu_buffer;

    uint8_t *edge_emu_buffer;     ///< points into the middle of allocated_edge_emu_buffer

    uint8_t *rd_scratchpad;       ///< scratchpad for rate distortion mb decision

    uint8_t *obmc_scratchpad;

    uint8_t *b_scratchpad;        ///< scratchpad used for writing into write only buffers

    int qscale;                 ///< QP

    int chroma_qscale;          ///< chroma QP

    unsigned int lambda;        ///< lagrange multipler used in rate distortion

    unsigned int lambda2;       ///< (lambda*lambda) >> FF_LAMBDA_SHIFT

    int *lambda_table;

    int adaptive_quant;         ///< use adaptive quantization

    int dquant;                 ///< qscale difference to prev qscale

    int pict_type;              ///< FF_I_TYPE, FF_P_TYPE, FF_B_TYPE, ...

    int last_pict_type; //FIXME removes

    int last_non_b_pict_type;   ///< used for mpeg4 gmc b-frames & ratecontrol

    int dropable;

    int frame_rate_index;

    int last_lambda_for[5];     ///< last lambda for a specific pict type

    int skipdct;                ///< skip dct and code zero residual

    /* motion compensation */

    int unrestricted_mv;        ///< mv can point outside of the coded picture

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

    int decode;                 ///< if 0 then decoding will be skipped (for encoding b frames for example)

    DSPContext dsp;             ///< pointers for accelerated dsp functions

    int f_code;                 ///< forward MV resolution

    int b_code;                 ///< backward MV resolution for B Frames (mpeg4)

    int16_t (*p_mv_table_base)[2];

    int16_t (*b_forw_mv_table_base)[2];

    int16_t (*b_back_mv_table_base)[2];

    int16_t (*b_bidir_forw_mv_table_base)[2];

    int16_t (*b_bidir_back_mv_table_base)[2];

    int16_t (*b_direct_mv_table_base)[2];

    int16_t (*p_field_mv_table_base[2][2])[2];

    int16_t (*b_field_mv_table_base[2][2][2])[2];

    int16_t (*p_mv_table)[2];            ///< MV table (1MV per MB) p-frame encoding

    int16_t (*b_forw_mv_table)[2];       ///< MV table (1MV per MB) forward mode b-frame encoding

    int16_t (*b_back_mv_table)[2];       ///< MV table (1MV per MB) backward mode b-frame encoding

    int16_t (*b_bidir_forw_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding

    int16_t (*b_bidir_back_mv_table)[2]; ///< MV table (1MV per MB) bidir mode b-frame encoding

    int16_t (*b_direct_mv_table)[2];     ///< MV table (1MV per MB) direct mode b-frame encoding

    int16_t (*p_field_mv_table[2][2])[2];   ///< MV table (2MV per MB) interlaced p-frame encoding

    int16_t (*b_field_mv_table[2][2][2])[2];///< MV table (4MV per MB) interlaced b-frame encoding

    uint8_t (*p_field_select_table[2]);

    uint8_t (*b_field_select_table[2][2]);

    int me_method;                       ///< ME algorithm

    int mv_dir;

#define MV_DIR_FORWARD   1

#define MV_DIR_BACKWARD  2

#define MV_DIRECT        4 ///< bidirectional mode where the difference equals the MV of the last P/S/I-Frame (mpeg4)

    int mv_type;

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

#define MV_TYPE_8X8         1   ///< 4 vectors (h263, mpeg4 4MV)

#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];             ///< last MV, used for MV prediction in MPEG1 & B-frame MPEG4

    uint8_t *fcode_tab;               ///< smallest fcode needed for each MV

    int16_t direct_scale_mv[2][64];   ///< precomputed to avoid divisions in ff_mpeg4_set_direct_mv

    MotionEstContext me;

    int no_rounding;  /**< apply no rounding to motion compensation (MPEG4, msmpeg4, ...)

                        for b-frames rounding mode is always 0 */

    int hurry_up;     /**< when set to 1 during decoding, b frames will be skipped

                         when set to 2 idct/dequant will be skipped too */

    /* macroblock layer */

    int mb_x, mb_y;

    int mb_skip_run;

    int mb_intra;

    uint16_t *mb_type;           ///< Table for candidate MB types for encoding

#define CANDIDATE_MB_TYPE_INTRA    0x01

#define CANDIDATE_MB_TYPE_INTER    0x02

#define CANDIDATE_MB_TYPE_INTER4V  0x04

#define CANDIDATE_MB_TYPE_SKIPPED   0x08

//#define MB_TYPE_GMC      0x10

#define CANDIDATE_MB_TYPE_DIRECT   0x10

#define CANDIDATE_MB_TYPE_FORWARD  0x20

#define CANDIDATE_MB_TYPE_BACKWARD 0x40

#define CANDIDATE_MB_TYPE_BIDIR    0x80

#define CANDIDATE_MB_TYPE_INTER_I    0x100

#define CANDIDATE_MB_TYPE_FORWARD_I  0x200

#define CANDIDATE_MB_TYPE_BACKWARD_I 0x400

#define CANDIDATE_MB_TYPE_BIDIR_I    0x800

#define CANDIDATE_MB_TYPE_DIRECT0    0x1000

    int block_index[6]; ///< index to current MB in block based arrays with edges

    int block_wrap[6];

    uint8_t *dest[3];

    int *mb_index2xy;        ///< mb_index -> mb_x + mb_y*mb_stride

    /** matrix transmitted in the bitstream */

    uint16_t intra_matrix[64];

    uint16_t chroma_intra_matrix[64];

    uint16_t inter_matrix[64];

    uint16_t chroma_inter_matrix[64];

#define QUANT_BIAS_SHIFT 8

    int intra_quant_bias;    ///< bias for the quantizer

    int inter_quant_bias;    ///< bias for the quantizer

    int min_qcoeff;          ///< minimum encodable coefficient

    int max_qcoeff;          ///< maximum encodable coefficient

    int ac_esc_length;       ///< num of bits needed to encode the longest esc

    uint8_t *intra_ac_vlc_length;

    uint8_t *intra_ac_vlc_last_length;

    uint8_t *inter_ac_vlc_length;

    uint8_t *inter_ac_vlc_last_length;

    uint8_t *luma_dc_vlc_length;

    uint8_t *chroma_dc_vlc_length;

#define UNI_AC_ENC_INDEX(run,level) ((run)*128 + (level))

    int coded_score[8];

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

    int (*q_intra_matrix)[64];

    int (*q_inter_matrix)[64];

    /** identical to the above but for MMX & these are not permutated, second 64 entries are bias*/

    uint16_t (*q_intra_matrix16)[2][64];

    uint16_t (*q_inter_matrix16)[2][64];

    int block_last_index[12];  ///< last non zero coefficient in block

    /* scantables */

    DECLARE_ALIGNED_8(ScanTable, intra_scantable);

    ScanTable intra_h_scantable;

    ScanTable intra_v_scantable;

    ScanTable inter_scantable; ///< if inter == intra then intra should be used to reduce tha cache usage

    /* noise reduction */

    int (*dct_error_sum)[64];

    int dct_count[2];

    uint16_t (*dct_offset)[64];

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

    /* bit rate control */

    int64_t wanted_bits;

    int64_t total_bits;

    int frame_bits;                ///< bits used for the current frame

    int next_lambda;               ///< next lambda used for retrying to encode a frame

    RateControlContext rc_context; ///< contains stuff only accessed in ratecontrol.c

    /* statistics, used for 2-pass encoding */

    int mv_bits;

    int header_bits;

    int i_tex_bits;

    int p_tex_bits;

    int i_count;

    int f_count;

    int b_count;

    int skip_count;

    int misc_bits; ///< cbp, mb_type

    int last_bits; ///< temp var used for calculating the above vars

    /* error concealment / resync */

    int error_count;

    uint8_t *error_status_table;       ///< table of the error status of each MB

#define VP_START            1          ///< current MB is the first after a resync marker

#define AC_ERROR            2

#define DC_ERROR            4

#define MV_ERROR            8

#define AC_END              16

#define DC_END              32

#define MV_END              64

//FIXME some prefix?

    int resync_mb_x;                 ///< x position of last resync marker

    int resync_mb_y;                 ///< y position of last resync marker

    GetBitContext last_resync_gb;    ///< used to search for the next resync marker

    int mb_num_left;                 ///< number of MBs left in this video packet (for partitioned Slices only)

    int next_p_frame_damaged;        ///< set if the next p frame is damaged, to avoid showing trashed b frames

    int error_recognition;

    ParseContext parse_context;

    /* H.263 specific */

    int gob_index;

    int obmc;                       ///< overlapped block motion compensation

    int showed_packed_warning;      ///< flag for having shown the warning about divxs invalid b frames

    /* H.263+ specific */

    int umvplus;                    ///< == H263+ && unrestricted_mv

    int h263_aic;                   ///< Advanded INTRA Coding (AIC)

    int h263_aic_dir;               ///< AIC direction: 0 = left, 1 = top

    int h263_slice_structured;

    int alt_inter_vlc;              ///< alternative inter vlc

    int modified_quant;

    int loop_filter;

    int custom_pcf;

    /* mpeg4 specific */

    int time_increment_bits;        ///< number of bits to represent the fractional part of time

    int last_time_base;

    int time_base;                  ///< time in seconds of last I,P,S Frame

    int64_t time;                   ///< time of current frame

    int64_t last_non_b_time;

    uint16_t pp_time;               ///< time distance between the last 2 p,s,i frames

    uint16_t pb_time;               ///< time distance between the last b and p,s,i frame

    uint16_t pp_field_time;

    uint16_t pb_field_time;         ///< like above, just for interlaced

    int shape;

    int vol_sprite_usage;

    int sprite_width;

    int sprite_height;

    int sprite_left;

    int sprite_top;

    int sprite_brightness_change;

    int num_sprite_warping_points;

    int real_sprite_warping_points;

    uint16_t sprite_traj[4][2];      ///< sprite trajectory points

    int sprite_offset[2][2];         ///< sprite offset[isChroma][isMVY]

    int sprite_delta[2][2];          ///< sprite_delta [isY][isMVY]

    int sprite_shift[2];             ///< sprite shift [isChroma]

    int mcsel;

    int quant_precision;

    int quarter_sample;              ///< 1->qpel, 0->half pel ME/MC

    int scalability;

    int hierachy_type;

    int enhancement_type;

    int new_pred;

    int reduced_res_vop;

    int aspect_ratio_info; //FIXME remove

    int sprite_warping_accuracy;

    int low_latency_sprite;

    int data_partitioning;           ///< data partitioning flag from header

    int partitioned_frame;           ///< is current frame partitioned

    int rvlc;                        ///< reversible vlc

    int resync_marker;               ///< could this stream contain resync markers

    int low_delay;                   ///< no reordering needed / has no b-frames

    int vo_type;

    int vol_control_parameters;      ///< does the stream contain the low_delay flag, used to workaround buggy encoders

    int intra_dc_threshold;          ///< QP above whch the ac VLC should be used for intra dc

    int use_intra_dc_vlc;

    PutBitContext tex_pb;            ///< used for data partitioned VOPs

    PutBitContext pb2;               ///< used for data partitioned VOPs

    int mpeg_quant;

    int t_frame;                       ///< time distance of first I -> B, used for interlaced b frames

    int padding_bug_score;             ///< used to detect the VERY common padding bug in MPEG4

    int cplx_estimation_trash_i;

    int cplx_estimation_trash_p;

    int cplx_estimation_trash_b;

    /* divx specific, used to workaround (many) bugs in divx5 */

    int divx_version;

    int divx_build;

    int divx_packed;

    uint8_t *bitstream_buffer; //Divx 5.01 puts several frames in a single one, this is used to reorder them

    int bitstream_buffer_size;

    unsigned int allocated_bitstream_buffer_size;

    int xvid_build;

    /* lavc specific stuff, used to workaround bugs in libavcodec */

    int lavc_build;

    /* RV10 specific */

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

    int rv10_first_dc_coded[3];

    /* MJPEG specific */

    struct MJpegContext *mjpeg_ctx;

    int mjpeg_vsample[3];       ///< vertical sampling factors, default = {2, 1, 1}

    int mjpeg_hsample[3];       ///< horizontal sampling factors, default = {2, 1, 1}

    /* 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;  ///< used in mpeg4 too to handle resync markers

    int flipflop_rounding;

    int msmpeg4_version;   ///< 0=not msmpeg4, 1=mp41, 2=mp42, 3=mp43/divx3 4=wmv1/7 5=wmv2/8

    int per_mb_rl_table;

    int esc3_level_length;

    int esc3_run_length;

    /** [mb_intra][isChroma][level][run][last] */

    int (*ac_stats)[2][MAX_LEVEL+1][MAX_RUN+1][2];

    int inter_intra_pred;

    int mspel;

    /* decompression specific */

    GetBitContext gb;

    /* Mpeg1 specific */

    int gop_picture_number;  ///< index of the first picture of a GOP based on fake_pic_num & mpeg1 specific

    int last_mv_dir;         ///< last mv_dir, used for b frame encoding

    int broken_link;         ///< no_output_of_prior_pics_flag

    uint8_t *vbv_delay_ptr;  ///< pointer to vbv_delay in the bitstream

    /* MPEG-2-specific - I wished not to have 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 chroma_format;

#define CHROMA_420 1

#define CHROMA_422 2

#define CHROMA_444 3

    int chroma_x_shift;//depend on pix_format, that depend on chroma_format

    int chroma_y_shift;

    int progressive_frame;

    int full_pel[2];

    int interlaced_dct;

    int first_slice;

    int first_field;         ///< is 1 for the first field of a field picture 0 otherwise

    /* RTP specific */

    int rtp_mode;

    uint8_t *ptr_lastgob;

    int swap_uv;             //vcr2 codec is an MPEG-2 variant with U and V swapped

    DCTELEM (*pblocks[12])[64];

    DCTELEM (*block)[64]; ///< points to one of the following blocks

    DCTELEM (*blocks)[8][64]; // for HQ mode we need to keep the best block

    int (*decode_mb)(struct MpegEncContext *s, DCTELEM block[6][64]); // used by some codecs to avoid a switch()

#define SLICE_OK         0

#define SLICE_ERROR     -1

#define SLICE_END       -2 ///<end marker found

#define SLICE_NOEND     -3 ///<no end marker or error found but mb count exceeded

    void (*dct_unquantize_mpeg1_intra)(struct MpegEncContext *s,

                           DCTELEM *block/*align 16*/, int n, int qscale);

    void (*dct_unquantize_mpeg1_inter)(struct MpegEncContext *s,

                           DCTELEM *block/*align 16*/, int n, int qscale);

    void (*dct_unquantize_mpeg2_intra)(struct MpegEncContext *s,

                           DCTELEM *block/*align 16*/, int n, int qscale);

    void (*dct_unquantize_mpeg2_inter)(struct MpegEncContext *s,

                           DCTELEM *block/*align 16*/, int n, int qscale);

    void (*dct_unquantize_h263_intra)(struct MpegEncContext *s,

                           DCTELEM *block/*align 16*/, int n, int qscale);

    void (*dct_unquantize_h263_inter)(struct MpegEncContext *s,

                           DCTELEM *block/*align 16*/, int n, int qscale);

    void (*dct_unquantize_h261_intra)(struct MpegEncContext *s,

                           DCTELEM *block/*align 16*/, int n, int qscale);

    void (*dct_unquantize_h261_inter)(struct MpegEncContext *s,

                           DCTELEM *block/*align 16*/, int n, int qscale);

    void (*dct_unquantize_intra)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)

                           DCTELEM *block/*align 16*/, int n, int qscale);

    void (*dct_unquantize_inter)(struct MpegEncContext *s, // unquantizer to use (mpeg4 can use both)

                           DCTELEM *block/*align 16*/, int n, int qscale);

    int (*dct_quantize)(struct MpegEncContext *s, DCTELEM *block/*align 16*/, int n, int qscale, int *overflow);

    int (*fast_dct_quantize)(struct MpegEncContext *s, DCTELEM *block/*align 16*/, int n, int qscale, int *overflow);

    void (*denoise_dct)(struct MpegEncContext *s, DCTELEM *block);

} MpegEncContext;

void MPV_decode_defaults(MpegEncContext *s);

int MPV_common_init(MpegEncContext *s);

void MPV_common_end(MpegEncContext *s);

void MPV_decode_mb(MpegEncContext *s, DCTELEM block[12][64]);

int MPV_frame_start(MpegEncContext *s, AVCodecContext *avctx);

void MPV_frame_end(MpegEncContext *s);

int MPV_encode_init(AVCodecContext *avctx);

int MPV_encode_end(AVCodecContext *avctx);

int MPV_encode_picture(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data);

void MPV_common_init_mmx(MpegEncContext *s);

void MPV_common_init_axp(MpegEncContext *s);

void MPV_common_init_mlib(MpegEncContext *s);

void MPV_common_init_mmi(MpegEncContext *s);

void MPV_common_init_arm(MpegEncContext *s);

void MPV_common_init_altivec(MpegEncContext *s);

void ff_clean_intra_table_entries(MpegEncContext *s);

void ff_draw_horiz_band(MpegEncContext *s, int y, int h);

void ff_mpeg_flush(AVCodecContext *avctx);

void ff_print_debug_info(MpegEncContext *s, AVFrame *pict);

void ff_write_quant_matrix(PutBitContext *pb, uint16_t *matrix);

int ff_find_unused_picture(MpegEncContext *s, int shared);

void ff_denoise_dct(MpegEncContext *s, DCTELEM *block);

void ff_update_duplicate_context(MpegEncContext *dst, MpegEncContext *src);

const uint8_t *ff_find_start_code(const uint8_t *p, const uint8_t *end, uint32_t *state);

void ff_er_frame_start(MpegEncContext *s);

void ff_er_frame_end(MpegEncContext *s);

void ff_er_add_slice(MpegEncContext *s, int startx, int starty, int endx, int endy, int status);

int ff_dct_common_init(MpegEncContext *s);

void ff_convert_matrix(DSPContext *dsp, int (*qmat)[64], uint16_t (*qmat16)[2][64],

                       const uint16_t *quant_matrix, int bias, int qmin, int qmax, int intra);

void ff_init_block_index(MpegEncContext *s);

void ff_copy_picture(Picture *dst, Picture *src);

extern const enum PixelFormat ff_pixfmt_list_420[];

extern const enum PixelFormat ff_hwaccel_pixfmt_list_420[];

static inline void ff_update_block_index(MpegEncContext *s){

    const int block_size= 8>>s->avctx->lowres;

    s->block_index[0]+=2;

    s->block_index[1]+=2;

    s->block_index[2]+=2;

    s->block_index[3]+=2;

    s->block_index[4]++;

    s->block_index[5]++;

    s->dest[0]+= 2*block_size;

    s->dest[1]+= block_size;

    s->dest[2]+= block_size;

}

static inline int get_bits_diff(MpegEncContext *s){

    const int bits= put_bits_count(&s->pb);

    const int last= s->last_bits;

    s->last_bits = bits;

    return bits - last;

}

static inline int ff_h263_round_chroma(int x){

    static const uint8_t h263_chroma_roundtab[16] = {

    //  0  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15

        0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,

    };

    return h263_chroma_roundtab[x & 0xf] + (x >> 3);

}

/* motion_est.c */

void ff_estimate_p_frame_motion(MpegEncContext * s,

                             int mb_x, int mb_y);

void ff_estimate_b_frame_motion(MpegEncContext * s,

                             int mb_x, int mb_y);

int ff_get_best_fcode(MpegEncContext * s, int16_t (*mv_table)[2], int type);

void ff_fix_long_p_mvs(MpegEncContext * s);

void ff_fix_long_mvs(MpegEncContext * s, uint8_t *field_select_table, int field_select,

                     int16_t (*mv_table)[2], int f_code, int type, int truncate);

int ff_init_me(MpegEncContext *s);

int ff_pre_estimate_p_frame_motion(MpegEncContext * s, int mb_x, int mb_y);

int ff_epzs_motion_search(MpegEncContext * s, int *mx_ptr, int *my_ptr,

                             int P[10][2], int src_index, int ref_index, int16_t (*last_mv)[2],

                             int ref_mv_scale, int size, int h);

int ff_get_mb_score(MpegEncContext * s, int mx, int my, int src_index,

                               int ref_index, int size, int h, int add_rate);

/* mpeg12.c */

extern const uint8_t ff_mpeg1_dc_scale_table[128];

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);

void ff_mpeg1_encode_init(MpegEncContext *s);

void ff_mpeg1_encode_slice_header(MpegEncContext *s);

void ff_mpeg1_clean_buffers(MpegEncContext *s);

int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);

extern const uint8_t ff_mpeg4_y_dc_scale_table[32];

extern const uint8_t ff_mpeg4_c_dc_scale_table[32];

extern const uint8_t ff_aic_dc_scale_table[32];

extern const int16_t ff_mpeg4_default_intra_matrix[64];

extern const int16_t ff_mpeg4_default_non_intra_matrix[64];

extern const uint8_t ff_h263_chroma_qscale_table[32];

extern const uint8_t ff_h263_loop_filter_strength[32];

/* h261.c */

void ff_h261_loop_filter(MpegEncContext *s);

void ff_h261_reorder_mb_index(MpegEncContext* s);

void ff_h261_encode_mb(MpegEncContext *s,

                    DCTELEM block[6][64],

                    int motion_x, int motion_y);

void ff_h261_encode_picture_header(MpegEncContext * s, int picture_number);

void ff_h261_encode_init(MpegEncContext *s);

int ff_h261_get_picture_format(int width, int height);

/* h263.c, h263dec.c */

int ff_h263_decode_init(AVCodecContext *avctx);

int ff_h263_decode_frame(AVCodecContext *avctx,

                             void *data, int *data_size,

                             AVPacket *avpkt);

int ff_h263_decode_end(AVCodecContext *avctx);

void h263_encode_mb(MpegEncContext *s,

                    DCTELEM block[6][64],

                    int motion_x, int motion_y);

void mpeg4_encode_mb(MpegEncContext *s,

                    DCTELEM block[6][64],

                    int motion_x, int motion_y);

void h263_encode_picture_header(MpegEncContext *s, int picture_number);

void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number);

void h263_encode_gob_header(MpegEncContext * s, int mb_line);

int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir,

                        int *px, int *py);

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

                   int dir);

void ff_set_mpeg4_time(MpegEncContext * s);

void mpeg4_encode_picture_header(MpegEncContext *s, int picture_number);

void h263_encode_init(MpegEncContext *s);

void h263_decode_init_vlc(MpegEncContext *s);

int h263_decode_picture_header(MpegEncContext *s);

int ff_h263_decode_gob_header(MpegEncContext *s);

int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb);

void ff_h263_update_motion_val(MpegEncContext * s);

void ff_h263_loop_filter(MpegEncContext * s);

void ff_set_qscale(MpegEncContext * s, int qscale);

int ff_h263_decode_mba(MpegEncContext *s);

void ff_h263_encode_mba(MpegEncContext *s);

int intel_h263_decode_picture_header(MpegEncContext *s);

int flv_h263_decode_picture_header(MpegEncContext *s);

int ff_h263_decode_mb(MpegEncContext *s,

                      DCTELEM block[6][64]);

int ff_mpeg4_decode_mb(MpegEncContext *s,

                      DCTELEM block[6][64]);

int h263_get_picture_format(int width, int height);

void ff_mpeg4_encode_video_packet_header(MpegEncContext *s);

void ff_mpeg4_clean_buffers(MpegEncContext *s);

void ff_mpeg4_stuffing(PutBitContext * pbc);

void ff_mpeg4_init_partitions(MpegEncContext *s);

void ff_mpeg4_merge_partitions(MpegEncContext *s);

void ff_clean_mpeg4_qscales(MpegEncContext *s);

void ff_clean_h263_qscales(MpegEncContext *s);

int ff_mpeg4_decode_partitions(MpegEncContext *s);

int ff_mpeg4_get_video_packet_prefix_length(MpegEncContext *s);

int ff_h263_resync(MpegEncContext *s);

const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);

int ff_h263_get_gob_height(MpegEncContext *s);

void ff_mpeg4_init_direct_mv(MpegEncContext *s);

int ff_mpeg4_set_direct_mv(MpegEncContext *s, int mx, int my);

void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);

/* rv10.c */

void rv10_encode_picture_header(MpegEncContext *s, int picture_number);

int rv_decode_dc(MpegEncContext *s, int n);

void rv20_encode_picture_header(MpegEncContext *s, int picture_number);

/* 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);

int msmpeg4_decode_picture_header(MpegEncContext * s);

int msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size);

int ff_msmpeg4_decode_init(MpegEncContext *s);

void ff_msmpeg4_encode_init(MpegEncContext *s);

int ff_wmv2_decode_picture_header(MpegEncContext * s);

int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s);

void ff_wmv2_add_mb(MpegEncContext *s, DCTELEM block[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr);

void ff_mspel_motion(MpegEncContext *s,

                               uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,

                               uint8_t **ref_picture, op_pixels_func (*pix_op)[4],

                               int motion_x, int motion_y, int h);

int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number);

void ff_wmv2_encode_mb(MpegEncContext * s,

                       DCTELEM block[6][64],

                       int motion_x, int motion_y);

#endif /* AVCODEC_MPEGVIDEO_H */