H264 解码器源码

/* * 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.c * H.264 / AVC / MPEG4 part10 codec. * @author Michael Niedermayer <michaelni@gmx.at> */ #include "dsputil.h" #include "avcodec.h" #include "mpegvideo.h" #include "h264.h" #include "h264data.h" #include "h264_parser.h" #include "golomb.h" #include "rectangle.h" #include "define.h" #include "internal.h" #include "cabac.h" #ifdef ARCH_X86 #include "i386/h264_i386.h" #endif //#undef NDEBUG #include <assert.h> /** * Value of Picture.reference when Picture is not a reference picture, but * is held for delayed output. */ #define DELAYED_PIC_REF 4 static VLC coeff_token_vlc[4]; static VLC chroma_dc_coeff_token_vlc; static VLC total_zeros_vlc[15]; static VLC chroma_dc_total_zeros_vlc[3]; static VLC run_vlc[6]; static VLC run7_vlc; static void svq3_luma_dc_dequant_idct_c(DCTELEM *block, int qp); static void svq3_add_idct_c(uint8_t *dst, DCTELEM *block, int stride, int qp, int dc); static void 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); static void 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); static av_always_inline uint32_t pack16to32(int a, int b){ #ifdef WORDS_BIGENDIAN return (b&0xFFFF) + (a<<16); #else return (a&0xFFFF) + (b<<16); #endif } const uint8_t ff_rem6[52]={ 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, }; const uint8_t ff_log2_tab[256]={ 0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 }; const uint8_t ff_div6[52]={ 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, }; static void fill_caches(H264Context *h, int mb_type, int for_deblock){ MpegEncContext * const s = &h->s; const int mb_xy= h->mb_xy; int topleft_xy, top_xy, topright_xy, left_xy[2]; int topleft_type, top_type, topright_type, left_type[2]; int left_block[8]; int topleft_partition= -1; int i; top_xy = mb_xy - (s->mb_stride << FIELD_PICTURE); //FIXME deblocking could skip the intra and nnz parts. if(for_deblock && (h->slice_num == 1 || h->slice_table[mb_xy] == h->slice_table[top_xy]) && !FRAME_MBAFF) return; /* Wow, what a mess, why didn't they simplify the interlacing & intra * stuff, I can't imagine that these complex rules are worth it. */ topleft_xy = top_xy - 1; topright_xy= top_xy + 1; left_xy[1] = left_xy[0] = mb_xy-1; left_block[0]= 0; left_block[1]= 1; left_block[2]= 2; left_block[3]= 3; left_block[4]= 7; left_block[5]= 10; left_block[6]= 8; left_block[7]= 11; if(FRAME_MBAFF){ const int pair_xy = s->mb_x + (s->mb_y & ~1)*s->mb_stride; const int top_pair_xy = pair_xy - s->mb_stride; const int topleft_pair_xy = top_pair_xy - 1; const int topright_pair_xy = top_pair_xy + 1; const int topleft_mb_frame_flag = !IS_INTERLACED(s->current_picture.mb_type[topleft_pair_xy]); const int top_mb_frame_flag = !IS_INTERLACED(s->current_picture.mb_type[top_pair_xy]); const int topright_mb_frame_flag = !IS_INTERLACED(s->current_picture.mb_type[topright_pair_xy]); const int left_mb_frame_flag = !IS_INTERLACED(s->current_picture.mb_type[pair_xy-1]); const int curr_mb_frame_flag = !IS_INTERLACED(mb_type); const int bottom = (s->mb_y & 1); tprintf(s->avctx, "fill_caches: curr_mb_frame_flag:%d, left_mb_frame_flag:%d, topleft_mb_frame_flag:%d, top_mb_frame_flag:%d, topright_mb_frame_flag:%d\n", curr_mb_frame_flag, left_mb_frame_flag, topleft_mb_frame_flag, top_mb_frame_flag, topright_mb_frame_flag); if (bottom ? !curr_mb_frame_flag // bottom macroblock : (!curr_mb_frame_flag && !top_mb_frame_flag) // top macroblock ) { top_xy -= s->mb_stride; } if (bottom ? !curr_mb_frame_flag // bottom macroblock : (!curr_mb_frame_flag && !topleft_mb_frame_flag) // top macroblock ) { topleft_xy -= s->mb_stride; } else if(bottom && curr_mb_frame_flag && !left_mb_frame_flag) { topleft_xy += s->mb_stride; // take topleft mv from the middle of the mb, as opposed to all other modes which use the bottom-right partition topleft_partition = 0; } if (bottom ? !curr_mb_frame_flag // bottom macroblock : (!curr_mb_frame_flag && !topright_mb_frame_flag) // top macroblock ) { topright_xy -= s->mb_stride; } if (left_mb_frame_flag != curr_mb_frame_flag) { left_xy[1] = left_xy[0] = pair_xy - 1; if (curr_mb_frame_flag) { if (bottom) { left_block[0]= 2; left_block[1]= 2; left_block[2]= 3; left_block[3]= 3; left_block[4]= 8; left_block[5]= 11; left_block[6]= 8; left_block[7]= 11; } else { left_block[0]= 0; left_block[1]= 0; left_block[2]= 1; left_block[3]= 1; left_block[4]= 7; left_block[5]= 10; left_block[6]= 7; left_block[7]= 10; } } else { left_xy[1] += s->mb_stride; //left_block[0]= 0; left_block[1]= 2; left_block[2]= 0; left_block[3]= 2; //left_block[4]= 7; left_block[5]= 10; left_block[6]= 7; left_block[7]= 10; } } } h->top_mb_xy = top_xy; h->left_mb_xy[0] = left_xy[0]; h->left_mb_xy[1] = left_xy[1]; if(for_deblock){ topleft_type = 0; topright_type = 0; top_type = h->slice_table[top_xy ] < 255 ? s->current_picture.mb_type[top_xy] : 0; left_type[0] = h->slice_table[left_