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libavcodec/h264.h

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00001 /*
00002  * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
00003  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00028 #ifndef AVCODEC_H264_H
00029 #define AVCODEC_H264_H
00030 
00031 #include "libavutil/intreadwrite.h"
00032 #include "dsputil.h"
00033 #include "cabac.h"
00034 #include "mpegvideo.h"
00035 #include "h264dsp.h"
00036 #include "h264pred.h"
00037 #include "rectangle.h"
00038 
00039 #define interlaced_dct interlaced_dct_is_a_bad_name
00040 #define mb_intra mb_intra_is_not_initialized_see_mb_type
00041 
00042 #define MAX_SPS_COUNT 32
00043 #define MAX_PPS_COUNT 256
00044 
00045 #define MAX_MMCO_COUNT 66
00046 
00047 #define MAX_DELAYED_PIC_COUNT 16
00048 
00049 #define MAX_MBPAIR_SIZE (256*1024) // a tighter bound could be calculated if someone cares about a few bytes
00050 
00051 /* Compiling in interlaced support reduces the speed
00052  * of progressive decoding by about 2%. */
00053 #define ALLOW_INTERLACE
00054 
00055 #define FMO 0
00056 
00061 #define MAX_SLICES 16
00062 
00063 #ifdef ALLOW_INTERLACE
00064 #define MB_MBAFF h->mb_mbaff
00065 #define MB_FIELD h->mb_field_decoding_flag
00066 #define FRAME_MBAFF h->mb_aff_frame
00067 #define FIELD_PICTURE (s->picture_structure != PICT_FRAME)
00068 #define LEFT_MBS 2
00069 #define LTOP 0
00070 #define LBOT 1
00071 #define LEFT(i) (i)
00072 #else
00073 #define MB_MBAFF 0
00074 #define MB_FIELD 0
00075 #define FRAME_MBAFF 0
00076 #define FIELD_PICTURE 0
00077 #undef  IS_INTERLACED
00078 #define IS_INTERLACED(mb_type) 0
00079 #define LEFT_MBS 1
00080 #define LTOP 0
00081 #define LBOT 0
00082 #define LEFT(i) 0
00083 #endif
00084 #define FIELD_OR_MBAFF_PICTURE (FRAME_MBAFF || FIELD_PICTURE)
00085 
00086 #ifndef CABAC
00087 #define CABAC h->pps.cabac
00088 #endif
00089 
00090 #define CHROMA422 (h->sps.chroma_format_idc == 2)
00091 #define CHROMA444 (h->sps.chroma_format_idc == 3)
00092 
00093 #define EXTENDED_SAR          255
00094 
00095 #define MB_TYPE_REF0       MB_TYPE_ACPRED //dirty but it fits in 16 bit
00096 #define MB_TYPE_8x8DCT     0x01000000
00097 #define IS_REF0(a)         ((a) & MB_TYPE_REF0)
00098 #define IS_8x8DCT(a)       ((a) & MB_TYPE_8x8DCT)
00099 
00104 #define DELAYED_PIC_REF 4
00105 
00106 #define QP_MAX_NUM (51 + 4*6)           // The maximum supported qp
00107 
00108 /* NAL unit types */
00109 enum {
00110     NAL_SLICE=1,
00111     NAL_DPA,
00112     NAL_DPB,
00113     NAL_DPC,
00114     NAL_IDR_SLICE,
00115     NAL_SEI,
00116     NAL_SPS,
00117     NAL_PPS,
00118     NAL_AUD,
00119     NAL_END_SEQUENCE,
00120     NAL_END_STREAM,
00121     NAL_FILLER_DATA,
00122     NAL_SPS_EXT,
00123     NAL_AUXILIARY_SLICE=19
00124 };
00125 
00129 typedef enum {
00130     SEI_BUFFERING_PERIOD             =  0, 
00131     SEI_TYPE_PIC_TIMING              =  1, 
00132     SEI_TYPE_USER_DATA_UNREGISTERED  =  5, 
00133     SEI_TYPE_RECOVERY_POINT          =  6  
00134 } SEI_Type;
00135 
00139 typedef enum {
00140     SEI_PIC_STRUCT_FRAME             = 0, 
00141     SEI_PIC_STRUCT_TOP_FIELD         = 1, 
00142     SEI_PIC_STRUCT_BOTTOM_FIELD      = 2, 
00143     SEI_PIC_STRUCT_TOP_BOTTOM        = 3, 
00144     SEI_PIC_STRUCT_BOTTOM_TOP        = 4, 
00145     SEI_PIC_STRUCT_TOP_BOTTOM_TOP    = 5, 
00146     SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, 
00147     SEI_PIC_STRUCT_FRAME_DOUBLING    = 7, 
00148     SEI_PIC_STRUCT_FRAME_TRIPLING    = 8  
00149 } SEI_PicStructType;
00150 
00154 typedef struct SPS{
00155 
00156     int profile_idc;
00157     int level_idc;
00158     int chroma_format_idc;
00159     int transform_bypass;              
00160     int log2_max_frame_num;            
00161     int poc_type;                      
00162     int log2_max_poc_lsb;              
00163     int delta_pic_order_always_zero_flag;
00164     int offset_for_non_ref_pic;
00165     int offset_for_top_to_bottom_field;
00166     int poc_cycle_length;              
00167     int ref_frame_count;               
00168     int gaps_in_frame_num_allowed_flag;
00169     int mb_width;                      
00170     int mb_height;                     
00171     int frame_mbs_only_flag;
00172     int mb_aff;                        
00173     int direct_8x8_inference_flag;
00174     int crop;                   
00175     unsigned int crop_left;            
00176     unsigned int crop_right;           
00177     unsigned int crop_top;             
00178     unsigned int crop_bottom;          
00179     int vui_parameters_present_flag;
00180     AVRational sar;
00181     int video_signal_type_present_flag;
00182     int full_range;
00183     int colour_description_present_flag;
00184     enum AVColorPrimaries color_primaries;
00185     enum AVColorTransferCharacteristic color_trc;
00186     enum AVColorSpace colorspace;
00187     int timing_info_present_flag;
00188     uint32_t num_units_in_tick;
00189     uint32_t time_scale;
00190     int fixed_frame_rate_flag;
00191     short offset_for_ref_frame[256]; //FIXME dyn aloc?
00192     int bitstream_restriction_flag;
00193     int num_reorder_frames;
00194     int scaling_matrix_present;
00195     uint8_t scaling_matrix4[6][16];
00196     uint8_t scaling_matrix8[6][64];
00197     int nal_hrd_parameters_present_flag;
00198     int vcl_hrd_parameters_present_flag;
00199     int pic_struct_present_flag;
00200     int time_offset_length;
00201     int cpb_cnt;                       
00202     int initial_cpb_removal_delay_length; 
00203     int cpb_removal_delay_length;      
00204     int dpb_output_delay_length;       
00205     int bit_depth_luma;                
00206     int bit_depth_chroma;              
00207     int residual_color_transform_flag; 
00208     int constraint_set_flags;          
00209 }SPS;
00210 
00214 typedef struct PPS{
00215     unsigned int sps_id;
00216     int cabac;                  
00217     int pic_order_present;      
00218     int slice_group_count;      
00219     int mb_slice_group_map_type;
00220     unsigned int ref_count[2];  
00221     int weighted_pred;          
00222     int weighted_bipred_idc;
00223     int init_qp;                
00224     int init_qs;                
00225     int chroma_qp_index_offset[2];
00226     int deblocking_filter_parameters_present; 
00227     int constrained_intra_pred; 
00228     int redundant_pic_cnt_present; 
00229     int transform_8x8_mode;     
00230     uint8_t scaling_matrix4[6][16];
00231     uint8_t scaling_matrix8[6][64];
00232     uint8_t chroma_qp_table[2][QP_MAX_NUM+1];  
00233     int chroma_qp_diff;
00234 }PPS;
00235 
00239 typedef enum MMCOOpcode{
00240     MMCO_END=0,
00241     MMCO_SHORT2UNUSED,
00242     MMCO_LONG2UNUSED,
00243     MMCO_SHORT2LONG,
00244     MMCO_SET_MAX_LONG,
00245     MMCO_RESET,
00246     MMCO_LONG,
00247 } MMCOOpcode;
00248 
00252 typedef struct MMCO{
00253     MMCOOpcode opcode;
00254     int short_pic_num;  
00255     int long_arg;       
00256 } MMCO;
00257 
00261 typedef struct H264Context{
00262     MpegEncContext s;
00263     H264DSPContext h264dsp;
00264     int pixel_shift;    
00265     int chroma_qp[2]; //QPc
00266 
00267     int qp_thresh;      
00268 
00269     int prev_mb_skipped;
00270     int next_mb_skipped;
00271 
00272     //prediction stuff
00273     int chroma_pred_mode;
00274     int intra16x16_pred_mode;
00275 
00276     int topleft_mb_xy;
00277     int top_mb_xy;
00278     int topright_mb_xy;
00279     int left_mb_xy[LEFT_MBS];
00280 
00281     int topleft_type;
00282     int top_type;
00283     int topright_type;
00284     int left_type[LEFT_MBS];
00285 
00286     const uint8_t * left_block;
00287     int topleft_partition;
00288 
00289     int8_t intra4x4_pred_mode_cache[5*8];
00290     int8_t (*intra4x4_pred_mode);
00291     H264PredContext hpc;
00292     unsigned int topleft_samples_available;
00293     unsigned int top_samples_available;
00294     unsigned int topright_samples_available;
00295     unsigned int left_samples_available;
00296     uint8_t (*top_borders[2])[(16*3)*2];
00297 
00302     DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15*8];
00303 
00304     uint8_t (*non_zero_count)[48];
00305 
00309     DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5*8][2];
00310     DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5*8];
00311 #define LIST_NOT_USED -1 //FIXME rename?
00312 #define PART_NOT_AVAILABLE -2
00313 
00317     int neighbor_transform_size;
00318 
00323     int block_offset[2*(16*3)];
00324 
00325     uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
00326     uint32_t *mb2br_xy;
00327     int b_stride; //FIXME use s->b4_stride
00328 
00329     int mb_linesize;   
00330     int mb_uvlinesize;
00331 
00332     int emu_edge_width;
00333     int emu_edge_height;
00334 
00335     SPS sps; 
00336 
00340     PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?
00341 
00342     uint32_t dequant4_buffer[6][QP_MAX_NUM+1][16]; //FIXME should these be moved down?
00343     uint32_t dequant8_buffer[6][QP_MAX_NUM+1][64];
00344     uint32_t (*dequant4_coeff[6])[16];
00345     uint32_t (*dequant8_coeff[6])[64];
00346 
00347     int slice_num;
00348     uint16_t *slice_table;     
00349     int slice_type;
00350     int slice_type_nos;        
00351     int slice_type_fixed;
00352 
00353     //interlacing specific flags
00354     int mb_aff_frame;
00355     int mb_field_decoding_flag;
00356     int mb_mbaff;              
00357 
00358     DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
00359 
00360     //Weighted pred stuff
00361     int use_weight;
00362     int use_weight_chroma;
00363     int luma_log2_weight_denom;
00364     int chroma_log2_weight_denom;
00365     //The following 2 can be changed to int8_t but that causes 10cpu cycles speedloss
00366     int luma_weight[48][2][2];
00367     int chroma_weight[48][2][2][2];
00368     int implicit_weight[48][48][2];
00369 
00370     int direct_spatial_mv_pred;
00371     int col_parity;
00372     int col_fieldoff;
00373     int dist_scale_factor[16];
00374     int dist_scale_factor_field[2][32];
00375     int map_col_to_list0[2][16+32];
00376     int map_col_to_list0_field[2][2][16+32];
00377 
00381     uint8_t *list_counts;            
00382     unsigned int ref_count[2];   
00383     unsigned int list_count;
00384     Picture ref_list[2][48];         
00387     int ref2frm[MAX_SLICES][2][64];  
00388 
00389     //data partitioning
00390     GetBitContext intra_gb;
00391     GetBitContext inter_gb;
00392     GetBitContext *intra_gb_ptr;
00393     GetBitContext *inter_gb_ptr;
00394 
00395     DECLARE_ALIGNED(16, DCTELEM, mb)[16*48*2]; 
00396     DECLARE_ALIGNED(16, DCTELEM, mb_luma_dc)[3][16*2];
00397     DCTELEM mb_padding[256*2];        
00398 
00402     CABACContext cabac;
00403     uint8_t      cabac_state[1024];
00404 
00405     /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */
00406     uint16_t     *cbp_table;
00407     int cbp;
00408     int top_cbp;
00409     int left_cbp;
00410     /* chroma_pred_mode for i4x4 or i16x16, else 0 */
00411     uint8_t     *chroma_pred_mode_table;
00412     int         last_qscale_diff;
00413     uint8_t     (*mvd_table[2])[2];
00414     DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5*8][2];
00415     uint8_t     *direct_table;
00416     uint8_t     direct_cache[5*8];
00417 
00418     uint8_t zigzag_scan[16];
00419     uint8_t zigzag_scan8x8[64];
00420     uint8_t zigzag_scan8x8_cavlc[64];
00421     uint8_t field_scan[16];
00422     uint8_t field_scan8x8[64];
00423     uint8_t field_scan8x8_cavlc[64];
00424     const uint8_t *zigzag_scan_q0;
00425     const uint8_t *zigzag_scan8x8_q0;
00426     const uint8_t *zigzag_scan8x8_cavlc_q0;
00427     const uint8_t *field_scan_q0;
00428     const uint8_t *field_scan8x8_q0;
00429     const uint8_t *field_scan8x8_cavlc_q0;
00430 
00431     int x264_build;
00432 
00433     int mb_xy;
00434 
00435     int is_complex;
00436 
00437     //deblock
00438     int deblocking_filter;         
00439     int slice_alpha_c0_offset;
00440     int slice_beta_offset;
00441 
00442 //=============================================================
00443     //Things below are not used in the MB or more inner code
00444 
00445     int nal_ref_idc;
00446     int nal_unit_type;
00447     uint8_t *rbsp_buffer[2];
00448     unsigned int rbsp_buffer_size[2];
00449 
00453     int is_avc; 
00454     int nal_length_size; 
00455     int got_first; 
00456 
00457     SPS *sps_buffers[MAX_SPS_COUNT];
00458     PPS *pps_buffers[MAX_PPS_COUNT];
00459 
00460     int dequant_coeff_pps;     
00461 
00462     uint16_t *slice_table_base;
00463 
00464 
00465     //POC stuff
00466     int poc_lsb;
00467     int poc_msb;
00468     int delta_poc_bottom;
00469     int delta_poc[2];
00470     int frame_num;
00471     int prev_poc_msb;             
00472     int prev_poc_lsb;             
00473     int frame_num_offset;         
00474     int prev_frame_num_offset;    
00475     int prev_frame_num;           
00476 
00480     int curr_pic_num;
00481 
00485     int max_pic_num;
00486 
00487     int redundant_pic_count;
00488 
00489     Picture *short_ref[32];
00490     Picture *long_ref[32];
00491     Picture default_ref_list[2][32]; 
00492     Picture *delayed_pic[MAX_DELAYED_PIC_COUNT+2]; //FIXME size?
00493     int last_pocs[MAX_DELAYED_PIC_COUNT];
00494     Picture *next_output_pic;
00495     int outputed_poc;
00496     int next_outputed_poc;
00497 
00501     MMCO mmco[MAX_MMCO_COUNT];
00502     int mmco_index;
00503     int mmco_reset;
00504 
00505     int long_ref_count;  
00506     int short_ref_count; 
00507 
00508     int          cabac_init_idc;
00509 
00514     struct H264Context *thread_context[MAX_THREADS];
00515 
00519     int current_slice;
00520 
00527     int max_contexts;
00528 
00533     int single_decode_warning;
00534 
00535     int last_slice_type;
00541     SEI_PicStructType sei_pic_struct;
00542 
00549     int prev_interlaced_frame;
00550 
00556     int sei_ct_type;
00557 
00561     int sei_dpb_output_delay;
00562 
00566     int sei_cpb_removal_delay;
00567 
00575     int sei_recovery_frame_cnt;
00582     int recovery_frame;
00583 
00584     int luma_weight_flag[2];   
00585     int chroma_weight_flag[2]; 
00586 
00587     // Timestamp stuff
00588     int sei_buffering_period_present;  
00589     int initial_cpb_removal_delay[32]; 
00590 
00591     int cur_chroma_format_idc;
00592 
00593     int16_t slice_row[MAX_SLICES]; 
00594 
00595     int sync;                      
00596 
00597     uint8_t parse_history[4];
00598     int parse_history_count;
00599     int parse_last_mb;
00600 }H264Context;
00601 
00602 
00603 extern const uint8_t ff_h264_chroma_qp[5][QP_MAX_NUM+1]; 
00604 
00608 int ff_h264_decode_sei(H264Context *h);
00609 
00613 int ff_h264_decode_seq_parameter_set(H264Context *h);
00614 
00618 int ff_h264_get_profile(SPS *sps);
00619 
00623 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length);
00624 
00632 const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length);
00633 
00637 av_cold void ff_h264_free_context(H264Context *h);
00638 
00642 int ff_h264_get_slice_type(const H264Context *h);
00643 
00648 int ff_h264_alloc_tables(H264Context *h);
00649 
00653 int ff_h264_fill_default_ref_list(H264Context *h);
00654 
00655 int ff_h264_decode_ref_pic_list_reordering(H264Context *h);
00656 void ff_h264_fill_mbaff_ref_list(H264Context *h);
00657 void ff_h264_remove_all_refs(H264Context *h);
00658 
00662 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count);
00663 
00664 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb);
00665 
00666 void ff_generate_sliding_window_mmcos(H264Context *h);
00667 
00668 
00672 int ff_h264_check_intra4x4_pred_mode(H264Context *h);
00673 
00674 int ff_h264_check_intra_pred_mode(H264Context *h, int mode, int is_chroma);
00675 
00676 void ff_h264_hl_decode_mb(H264Context *h);
00677 int ff_h264_frame_start(H264Context *h);
00678 int ff_h264_decode_extradata(H264Context *h, const uint8_t *buf, int size);
00679 av_cold int ff_h264_decode_init(AVCodecContext *avctx);
00680 av_cold int ff_h264_decode_end(AVCodecContext *avctx);
00681 av_cold void ff_h264_decode_init_vlc(void);
00682 
00687 int ff_h264_decode_mb_cavlc(H264Context *h);
00688 
00693 int ff_h264_decode_mb_cabac(H264Context *h);
00694 
00695 void ff_h264_init_cabac_states(H264Context *h);
00696 
00697 void ff_h264_direct_dist_scale_factor(H264Context * const h);
00698 void ff_h264_direct_ref_list_init(H264Context * const h);
00699 void ff_h264_pred_direct_motion(H264Context * const h, int *mb_type);
00700 
00701 void ff_h264_filter_mb_fast( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr, unsigned int linesize, unsigned int uvlinesize);
00702 void ff_h264_filter_mb( H264Context *h, int mb_x, int mb_y, uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr, unsigned int linesize, unsigned int uvlinesize);
00703 
00709 void ff_h264_reset_sei(H264Context *h);
00710 
00711 
00712 /*
00713 o-o o-o
00714  / / /
00715 o-o o-o
00716  ,---'
00717 o-o o-o
00718  / / /
00719 o-o o-o
00720 */
00721 
00722 /* Scan8 organization:
00723  *    0 1 2 3 4 5 6 7
00724  * 0  DY    y y y y y
00725  * 1        y Y Y Y Y
00726  * 2        y Y Y Y Y
00727  * 3        y Y Y Y Y
00728  * 4        y Y Y Y Y
00729  * 5  DU    u u u u u
00730  * 6        u U U U U
00731  * 7        u U U U U
00732  * 8        u U U U U
00733  * 9        u U U U U
00734  * 10 DV    v v v v v
00735  * 11       v V V V V
00736  * 12       v V V V V
00737  * 13       v V V V V
00738  * 14       v V V V V
00739  * DY/DU/DV are for luma/chroma DC.
00740  */
00741 
00742 #define LUMA_DC_BLOCK_INDEX   48
00743 #define CHROMA_DC_BLOCK_INDEX 49
00744 
00745 //This table must be here because scan8[constant] must be known at compiletime
00746 static const uint8_t scan8[16*3 + 3]={
00747  4+ 1*8, 5+ 1*8, 4+ 2*8, 5+ 2*8,
00748  6+ 1*8, 7+ 1*8, 6+ 2*8, 7+ 2*8,
00749  4+ 3*8, 5+ 3*8, 4+ 4*8, 5+ 4*8,
00750  6+ 3*8, 7+ 3*8, 6+ 4*8, 7+ 4*8,
00751  4+ 6*8, 5+ 6*8, 4+ 7*8, 5+ 7*8,
00752  6+ 6*8, 7+ 6*8, 6+ 7*8, 7+ 7*8,
00753  4+ 8*8, 5+ 8*8, 4+ 9*8, 5+ 9*8,
00754  6+ 8*8, 7+ 8*8, 6+ 9*8, 7+ 9*8,
00755  4+11*8, 5+11*8, 4+12*8, 5+12*8,
00756  6+11*8, 7+11*8, 6+12*8, 7+12*8,
00757  4+13*8, 5+13*8, 4+14*8, 5+14*8,
00758  6+13*8, 7+13*8, 6+14*8, 7+14*8,
00759  0+ 0*8, 0+ 5*8, 0+10*8
00760 };
00761 
00762 static av_always_inline uint32_t pack16to32(int a, int b){
00763 #if HAVE_BIGENDIAN
00764    return (b&0xFFFF) + (a<<16);
00765 #else
00766    return (a&0xFFFF) + (b<<16);
00767 #endif
00768 }
00769 
00770 static av_always_inline uint16_t pack8to16(int a, int b){
00771 #if HAVE_BIGENDIAN
00772    return (b&0xFF) + (a<<8);
00773 #else
00774    return (a&0xFF) + (b<<8);
00775 #endif
00776 }
00777 
00781 static av_always_inline int get_chroma_qp(H264Context *h, int t, int qscale){
00782     return h->pps.chroma_qp_table[t][qscale];
00783 }
00784 
00788 static av_always_inline int pred_intra_mode(H264Context *h, int n){
00789     const int index8= scan8[n];
00790     const int left= h->intra4x4_pred_mode_cache[index8 - 1];
00791     const int top = h->intra4x4_pred_mode_cache[index8 - 8];
00792     const int min= FFMIN(left, top);
00793 
00794     tprintf(h->s.avctx, "mode:%d %d min:%d\n", left ,top, min);
00795 
00796     if(min<0) return DC_PRED;
00797     else      return min;
00798 }
00799 
00800 static av_always_inline void write_back_intra_pred_mode(H264Context *h){
00801     int8_t *i4x4= h->intra4x4_pred_mode + h->mb2br_xy[h->mb_xy];
00802     int8_t *i4x4_cache= h->intra4x4_pred_mode_cache;
00803 
00804     AV_COPY32(i4x4, i4x4_cache + 4 + 8*4);
00805     i4x4[4]= i4x4_cache[7+8*3];
00806     i4x4[5]= i4x4_cache[7+8*2];
00807     i4x4[6]= i4x4_cache[7+8*1];
00808 }
00809 
00810 static av_always_inline void write_back_non_zero_count(H264Context *h){
00811     const int mb_xy= h->mb_xy;
00812     uint8_t *nnz = h->non_zero_count[mb_xy];
00813     uint8_t *nnz_cache = h->non_zero_count_cache;
00814 
00815     AV_COPY32(&nnz[ 0], &nnz_cache[4+8* 1]);
00816     AV_COPY32(&nnz[ 4], &nnz_cache[4+8* 2]);
00817     AV_COPY32(&nnz[ 8], &nnz_cache[4+8* 3]);
00818     AV_COPY32(&nnz[12], &nnz_cache[4+8* 4]);
00819     AV_COPY32(&nnz[16], &nnz_cache[4+8* 6]);
00820     AV_COPY32(&nnz[20], &nnz_cache[4+8* 7]);
00821     AV_COPY32(&nnz[32], &nnz_cache[4+8*11]);
00822     AV_COPY32(&nnz[36], &nnz_cache[4+8*12]);
00823 
00824     if(!h->s.chroma_y_shift){
00825         AV_COPY32(&nnz[24], &nnz_cache[4+8* 8]);
00826         AV_COPY32(&nnz[28], &nnz_cache[4+8* 9]);
00827         AV_COPY32(&nnz[40], &nnz_cache[4+8*13]);
00828         AV_COPY32(&nnz[44], &nnz_cache[4+8*14]);
00829     }
00830 }
00831 
00832 static av_always_inline void write_back_motion_list(H264Context *h, MpegEncContext * const s, int b_stride,
00833                                                     int b_xy, int b8_xy, int mb_type, int list )
00834 {
00835     int16_t (*mv_dst)[2] = &s->current_picture.f.motion_val[list][b_xy];
00836     int16_t (*mv_src)[2] = &h->mv_cache[list][scan8[0]];
00837     AV_COPY128(mv_dst + 0*b_stride, mv_src + 8*0);
00838     AV_COPY128(mv_dst + 1*b_stride, mv_src + 8*1);
00839     AV_COPY128(mv_dst + 2*b_stride, mv_src + 8*2);
00840     AV_COPY128(mv_dst + 3*b_stride, mv_src + 8*3);
00841     if( CABAC ) {
00842         uint8_t (*mvd_dst)[2] = &h->mvd_table[list][FMO ? 8*h->mb_xy : h->mb2br_xy[h->mb_xy]];
00843         uint8_t (*mvd_src)[2] = &h->mvd_cache[list][scan8[0]];
00844         if(IS_SKIP(mb_type))
00845             AV_ZERO128(mvd_dst);
00846         else{
00847             AV_COPY64(mvd_dst, mvd_src + 8*3);
00848             AV_COPY16(mvd_dst + 3 + 3, mvd_src + 3 + 8*0);
00849             AV_COPY16(mvd_dst + 3 + 2, mvd_src + 3 + 8*1);
00850             AV_COPY16(mvd_dst + 3 + 1, mvd_src + 3 + 8*2);
00851         }
00852     }
00853 
00854     {
00855         int8_t *ref_index = &s->current_picture.f.ref_index[list][b8_xy];
00856         int8_t *ref_cache = h->ref_cache[list];
00857         ref_index[0+0*2]= ref_cache[scan8[0]];
00858         ref_index[1+0*2]= ref_cache[scan8[4]];
00859         ref_index[0+1*2]= ref_cache[scan8[8]];
00860         ref_index[1+1*2]= ref_cache[scan8[12]];
00861     }
00862 }
00863 
00864 static av_always_inline void write_back_motion(H264Context *h, int mb_type){
00865     MpegEncContext * const s = &h->s;
00866     const int b_stride = h->b_stride;
00867     const int b_xy = 4*s->mb_x + 4*s->mb_y*h->b_stride; //try mb2b(8)_xy
00868     const int b8_xy= 4*h->mb_xy;
00869 
00870     if(USES_LIST(mb_type, 0)){
00871         write_back_motion_list(h, s, b_stride, b_xy, b8_xy, mb_type, 0);
00872     }else{
00873         fill_rectangle(&s->current_picture.f.ref_index[0][b8_xy],
00874                        2, 2, 2, (uint8_t)LIST_NOT_USED, 1);
00875     }
00876     if(USES_LIST(mb_type, 1)){
00877         write_back_motion_list(h, s, b_stride, b_xy, b8_xy, mb_type, 1);
00878     }
00879 
00880     if(h->slice_type_nos == AV_PICTURE_TYPE_B && CABAC){
00881         if(IS_8X8(mb_type)){
00882             uint8_t *direct_table = &h->direct_table[4*h->mb_xy];
00883             direct_table[1] = h->sub_mb_type[1]>>1;
00884             direct_table[2] = h->sub_mb_type[2]>>1;
00885             direct_table[3] = h->sub_mb_type[3]>>1;
00886         }
00887     }
00888 }
00889 
00890 static av_always_inline int get_dct8x8_allowed(H264Context *h){
00891     if(h->sps.direct_8x8_inference_flag)
00892         return !(AV_RN64A(h->sub_mb_type) & ((MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8                )*0x0001000100010001ULL));
00893     else
00894         return !(AV_RN64A(h->sub_mb_type) & ((MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_8x8|MB_TYPE_DIRECT2)*0x0001000100010001ULL));
00895 }
00896 
00897 #endif /* AVCODEC_H264_H */
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