mpegvideo.h

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/*
 * 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 mpegvideo.h
 * mpegvideo header.
 */

#ifndef FFMPEG_MPEGVIDEO_H
#define FFMPEG_MPEGVIDEO_H

#include "dsputil.h"
#include "bitstream.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][16];         ///< h264 POCs of the frames used as reference
    int ref_count[2];           ///< number of entries in ref_poc

    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

/* 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_resilience;

    ParseContext parse_context;

    /* H.263 specific */
    int gob_index;
    int obmc;                       ///< overlapped block motion compensation

    /* 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;
    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

    /* 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;