PeerStreamer

/*

 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder

 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>

 *

 * 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 h264.h

 * H.264 / AVC / MPEG4 part10 codec.

 * @author Michael Niedermayer <michaelni@gmx.at>

 */

#ifndef H264_H

#define H264_H

#include "dsputil.h"

#include "cabac.h"

#include "mpegvideo.h"

#define interlaced_dct interlaced_dct_is_a_bad_name

#define mb_intra mb_intra_is_not_initalized_see_mb_type

#define LUMA_DC_BLOCK_INDEX   25

#define CHROMA_DC_BLOCK_INDEX 26

#define CHROMA_DC_COEFF_TOKEN_VLC_BITS 8

#define COEFF_TOKEN_VLC_BITS           8

#define TOTAL_ZEROS_VLC_BITS           9

#define CHROMA_DC_TOTAL_ZEROS_VLC_BITS 3

#define RUN_VLC_BITS                   3

#define RUN7_VLC_BITS                  6

#define MAX_SPS_COUNT 32

#define MAX_PPS_COUNT 256

#define MAX_MMCO_COUNT 66

/* Compiling in interlaced support reduces the speed

 * of progressive decoding by about 2%. */

#define ALLOW_INTERLACE

#ifdef ALLOW_INTERLACE

#define MB_MBAFF h->mb_mbaff

#define MB_FIELD h->mb_field_decoding_flag

#define FRAME_MBAFF h->mb_aff_frame

#else

#define MB_MBAFF 0

#define MB_FIELD 0

#define FRAME_MBAFF 0

#undef  IS_INTERLACED

#define IS_INTERLACED(mb_type) 0

#endif

/**

 * Sequence parameter set

 */

typedef struct SPS{

    int profile_idc;

    int level_idc;

    int transform_bypass;              ///< qpprime_y_zero_transform_bypass_flag

    int log2_max_frame_num;            ///< log2_max_frame_num_minus4 + 4

    int poc_type;                      ///< pic_order_cnt_type

    int log2_max_poc_lsb;              ///< log2_max_pic_order_cnt_lsb_minus4

    int delta_pic_order_always_zero_flag;

    int offset_for_non_ref_pic;

    int offset_for_top_to_bottom_field;

    int poc_cycle_length;              ///< num_ref_frames_in_pic_order_cnt_cycle

    int ref_frame_count;               ///< num_ref_frames

    int gaps_in_frame_num_allowed_flag;

    int mb_width;                      ///< frame_width_in_mbs_minus1 + 1

    int mb_height;                     ///< frame_height_in_mbs_minus1 + 1

    int frame_mbs_only_flag;

    int mb_aff;                        ///<mb_adaptive_frame_field_flag

    int direct_8x8_inference_flag;

    int crop;                   ///< frame_cropping_flag

    int crop_left;              ///< frame_cropping_rect_left_offset

    int crop_right;             ///< frame_cropping_rect_right_offset

    int crop_top;               ///< frame_cropping_rect_top_offset

    int crop_bottom;            ///< frame_cropping_rect_bottom_offset

    int vui_parameters_present_flag;

    AVRational sar;

    int timing_info_present_flag;

    uint32_t num_units_in_tick;

    uint32_t time_scale;

    int fixed_frame_rate_flag;

    short offset_for_ref_frame[256]; //FIXME dyn aloc?

    int bitstream_restriction_flag;

    int num_reorder_frames;

    int scaling_matrix_present;

    uint8_t scaling_matrix4[6][16];

    uint8_t scaling_matrix8[2][64];

}SPS;

/**

 * Picture parameter set

 */

typedef struct PPS{

    unsigned int sps_id;

    int cabac;                  ///< entropy_coding_mode_flag

    int pic_order_present;      ///< pic_order_present_flag

    int slice_group_count;      ///< num_slice_groups_minus1 + 1

    int mb_slice_group_map_type;

    unsigned int ref_count[2];  ///< num_ref_idx_l0/1_active_minus1 + 1

    int weighted_pred;          ///< weighted_pred_flag

    int weighted_bipred_idc;

    int init_qp;                ///< pic_init_qp_minus26 + 26

    int init_qs;                ///< pic_init_qs_minus26 + 26

    int chroma_qp_index_offset;

    int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag

    int constrained_intra_pred; ///< constrained_intra_pred_flag

    int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag

    int transform_8x8_mode;     ///< transform_8x8_mode_flag

    uint8_t scaling_matrix4[6][16];

    uint8_t scaling_matrix8[2][64];

}PPS;

/**

 * Memory management control operation opcode.

 */

typedef enum MMCOOpcode{

    MMCO_END=0,

    MMCO_SHORT2UNUSED,

    MMCO_LONG2UNUSED,

    MMCO_SHORT2LONG,

    MMCO_SET_MAX_LONG,

    MMCO_RESET,

    MMCO_LONG,

} MMCOOpcode;

/**

 * Memory management control operation.

 */

typedef struct MMCO{

    MMCOOpcode opcode;

    int short_frame_num;

    int long_index;

} MMCO;

/**

 * H264Context

 */

typedef struct H264Context{

    MpegEncContext s;

    int nal_ref_idc;

    int nal_unit_type;

    uint8_t *rbsp_buffer;

    unsigned int rbsp_buffer_size;

    /**

      * Used to parse AVC variant of h264

      */

    int is_avc; ///< this flag is != 0 if codec is avc1

    int got_avcC; ///< flag used to parse avcC data only once

    int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)

    int chroma_qp; //QPc

    int prev_mb_skipped;

    int next_mb_skipped;

    //prediction stuff

    int chroma_pred_mode;

    int intra16x16_pred_mode;

    int top_mb_xy;

    int left_mb_xy[2];

    int8_t intra4x4_pred_mode_cache[5*8];

    int8_t (*intra4x4_pred_mode)[8];

    void (*pred4x4  [9+3])(uint8_t *src, uint8_t *topright, int stride);//FIXME move to dsp?

    void (*pred8x8l [9+3])(uint8_t *src, int topleft, int topright, int stride);

    void (*pred8x8  [4+3])(uint8_t *src, int stride);

    void (*pred16x16[4+3])(uint8_t *src, int stride);

    unsigned int topleft_samples_available;

    unsigned int top_samples_available;

    unsigned int topright_samples_available;

    unsigned int left_samples_available;

    uint8_t (*top_borders[2])[16+2*8];

    uint8_t left_border[2*(17+2*9)];

    /**

     * non zero coeff count cache.

     * is 64 if not available.

     */

    DECLARE_ALIGNED_8(uint8_t, non_zero_count_cache[6*8]);

    uint8_t (*non_zero_count)[16];

    /**

     * Motion vector cache.

     */

    DECLARE_ALIGNED_8(int16_t, mv_cache[2][5*8][2]);

    DECLARE_ALIGNED_8(int8_t, ref_cache[2][5*8]);

#define LIST_NOT_USED -1 //FIXME rename?

#define PART_NOT_AVAILABLE -2

    /**

     * is 1 if the specific list MV&references are set to 0,0,-2.

     */

    int mv_cache_clean[2];

    /**

     * number of neighbors (top and/or left) that used 8x8 dct

     */

    int neighbor_transform_size;

    /**

     * block_offset[ 0..23] for frame macroblocks

     * block_offset[24..47] for field macroblocks

     */

    int block_offset[2*(16+8)];

    uint32_t *mb2b_xy; //FIXME are these 4 a good idea?

    uint32_t *mb2b8_xy;

    int b_stride; //FIXME use s->b4_stride

    int b8_stride;

    int mb_linesize;   ///< may be equal to s->linesize or s->linesize*2, for mbaff

    int mb_uvlinesize;

    int emu_edge_width;

    int emu_edge_height;

    int halfpel_flag;

    int thirdpel_flag;

    int unknown_svq3_flag;

    int next_slice_index;

    SPS *sps_buffers[MAX_SPS_COUNT];

    SPS sps; ///< current sps

    PPS *pps_buffers[MAX_PPS_COUNT];

    /**

     * current pps

     */

    PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?

    uint32_t dequant4_buffer[6][52][16];

    uint32_t dequant8_buffer[2][52][64];

    uint32_t (*dequant4_coeff[6])[16];

    uint32_t (*dequant8_coeff[2])[64];

    int dequant_coeff_pps;     ///< reinit tables when pps changes

    int slice_num;

    uint8_t *slice_table_base;

    uint8_t *slice_table;      ///< slice_table_base + 2*mb_stride + 1

    int slice_type;

    int slice_type_fixed;

    //interlacing specific flags

    int mb_aff_frame;

    int mb_field_decoding_flag;

    int mb_mbaff;              ///< mb_aff_frame && mb_field_decoding_flag

    unsigned int sub_mb_type[4];

    //POC stuff

    int poc_lsb;

    int poc_msb;

    int delta_poc_bottom;

    int delta_poc[2];

    int frame_num;

    int prev_poc_msb;             ///< poc_msb of the last reference pic for POC type 0

    int prev_poc_lsb;             ///< poc_lsb of the last reference pic for POC type 0

    int frame_num_offset;         ///< for POC type 2

    int prev_frame_num_offset;    ///< for POC type 2

    int prev_frame_num;           ///< frame_num of the last pic for POC type 1/2

    /**

     * frame_num for frames or 2*frame_num for field pics.

     */

    int curr_pic_num;

    /**

     * max_frame_num or 2*max_frame_num for field pics.

     */

    int max_pic_num;

    //Weighted pred stuff

    int use_weight;

    int use_weight_chroma;

    int luma_log2_weight_denom;

    int chroma_log2_weight_denom;

    int luma_weight[2][48];

    int luma_offset[2][48];

    int chroma_weight[2][48][2];

    int chroma_offset[2][48][2];

    int implicit_weight[48][48];

    //deblock

    int deblocking_filter;         ///< disable_deblocking_filter_idc with 1<->0

    int slice_alpha_c0_offset;

    int slice_beta_offset;

    int redundant_pic_count;

    int direct_spatial_mv_pred;

    int dist_scale_factor[16];

    int dist_scale_factor_field[32];

    int map_col_to_list0[2][16];

    int map_col_to_list0_field[2][32];

    /**

     * num_ref_idx_l0/1_active_minus1 + 1

     */

    unsigned int ref_count[2];   ///< counts frames or fields, depending on current mb mode

    unsigned int list_count;

    Picture *short_ref[32];

    Picture *long_ref[32];

    Picture default_ref_list[2][32];

    Picture ref_list[2][48];     ///< 0..15: frame refs, 16..47: mbaff field refs

    Picture *delayed_pic[18]; //FIXME size?

    Picture *delayed_output_pic;

    /**

     * memory management control operations buffer.

     */

    MMCO mmco[MAX_MMCO_COUNT];

    int mmco_index;

    int long_ref_count;  ///< number of actual long term references

    int short_ref_count; ///< number of actual short term references

    //data partitioning

    GetBitContext intra_gb;

    GetBitContext inter_gb;

    GetBitContext *intra_gb_ptr;

    GetBitContext *inter_gb_ptr;

    DECLARE_ALIGNED_8(DCTELEM, mb[16*24]);

    DCTELEM mb_padding[256];        ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either check that i is not to large or ensure that there is some unused stuff after mb

    /**

     * Cabac

     */

    CABACContext cabac;

    uint8_t      cabac_state[460];

    int          cabac_init_idc;

    /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */

    uint16_t     *cbp_table;

    int cbp;

    int top_cbp;

    int left_cbp;

    /* chroma_pred_mode for i4x4 or i16x16, else 0 */

    uint8_t     *chroma_pred_mode_table;

    int         last_qscale_diff;

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

    DECLARE_ALIGNED_8(int16_t, mvd_cache[2][5*8][2]);

    uint8_t     *direct_table;

    uint8_t     direct_cache[5*8];

    uint8_t zigzag_scan[16];

    uint8_t zigzag_scan8x8[64];

    uint8_t zigzag_scan8x8_cavlc[64];

    uint8_t field_scan[16];

    uint8_t field_scan8x8[64];

    uint8_t field_scan8x8_cavlc[64];

    const uint8_t *zigzag_scan_q0;

    const uint8_t *zigzag_scan8x8_q0;

    const uint8_t *zigzag_scan8x8_cavlc_q0;

    const uint8_t *field_scan_q0;

    const uint8_t *field_scan8x8_q0;

    const uint8_t *field_scan8x8_cavlc_q0;

    int x264_build;

}H264Context;

#endif /* H264_H */