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https://git.ffmpeg.org/ffmpeg.git
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90b5b51eab
Originally committed as revision 9291 to svn://svn.ffmpeg.org/ffmpeg/trunk
387 lines
12 KiB
C
387 lines
12 KiB
C
/*
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* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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/**
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* @file h264.h
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* H.264 / AVC / MPEG4 part10 codec.
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#ifndef H264_H
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#define H264_H
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#include "dsputil.h"
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#include "cabac.h"
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#include "mpegvideo.h"
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#define interlaced_dct interlaced_dct_is_a_bad_name
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#define mb_intra mb_intra_is_not_initialized_see_mb_type
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#define LUMA_DC_BLOCK_INDEX 25
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#define CHROMA_DC_BLOCK_INDEX 26
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#define CHROMA_DC_COEFF_TOKEN_VLC_BITS 8
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#define COEFF_TOKEN_VLC_BITS 8
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#define TOTAL_ZEROS_VLC_BITS 9
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#define CHROMA_DC_TOTAL_ZEROS_VLC_BITS 3
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#define RUN_VLC_BITS 3
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#define RUN7_VLC_BITS 6
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#define MAX_SPS_COUNT 32
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#define MAX_PPS_COUNT 256
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#define MAX_MMCO_COUNT 66
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/* Compiling in interlaced support reduces the speed
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* of progressive decoding by about 2%. */
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#define ALLOW_INTERLACE
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#ifdef ALLOW_INTERLACE
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#define MB_MBAFF h->mb_mbaff
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#define MB_FIELD h->mb_field_decoding_flag
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#define FRAME_MBAFF h->mb_aff_frame
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#else
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#define MB_MBAFF 0
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#define MB_FIELD 0
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#define FRAME_MBAFF 0
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#undef IS_INTERLACED
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#define IS_INTERLACED(mb_type) 0
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#endif
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/**
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* Sequence parameter set
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*/
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typedef struct SPS{
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int profile_idc;
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int level_idc;
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int transform_bypass; ///< qpprime_y_zero_transform_bypass_flag
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int log2_max_frame_num; ///< log2_max_frame_num_minus4 + 4
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int poc_type; ///< pic_order_cnt_type
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int log2_max_poc_lsb; ///< log2_max_pic_order_cnt_lsb_minus4
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int delta_pic_order_always_zero_flag;
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int offset_for_non_ref_pic;
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int offset_for_top_to_bottom_field;
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int poc_cycle_length; ///< num_ref_frames_in_pic_order_cnt_cycle
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int ref_frame_count; ///< num_ref_frames
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int gaps_in_frame_num_allowed_flag;
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int mb_width; ///< frame_width_in_mbs_minus1 + 1
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int mb_height; ///< frame_height_in_mbs_minus1 + 1
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int frame_mbs_only_flag;
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int mb_aff; ///<mb_adaptive_frame_field_flag
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int direct_8x8_inference_flag;
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int crop; ///< frame_cropping_flag
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int crop_left; ///< frame_cropping_rect_left_offset
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int crop_right; ///< frame_cropping_rect_right_offset
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int crop_top; ///< frame_cropping_rect_top_offset
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int crop_bottom; ///< frame_cropping_rect_bottom_offset
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int vui_parameters_present_flag;
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AVRational sar;
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int timing_info_present_flag;
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uint32_t num_units_in_tick;
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uint32_t time_scale;
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int fixed_frame_rate_flag;
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short offset_for_ref_frame[256]; //FIXME dyn aloc?
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int bitstream_restriction_flag;
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int num_reorder_frames;
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int scaling_matrix_present;
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uint8_t scaling_matrix4[6][16];
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uint8_t scaling_matrix8[2][64];
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}SPS;
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/**
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* Picture parameter set
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*/
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typedef struct PPS{
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unsigned int sps_id;
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int cabac; ///< entropy_coding_mode_flag
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int pic_order_present; ///< pic_order_present_flag
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int slice_group_count; ///< num_slice_groups_minus1 + 1
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int mb_slice_group_map_type;
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unsigned int ref_count[2]; ///< num_ref_idx_l0/1_active_minus1 + 1
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int weighted_pred; ///< weighted_pred_flag
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int weighted_bipred_idc;
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int init_qp; ///< pic_init_qp_minus26 + 26
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int init_qs; ///< pic_init_qs_minus26 + 26
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int chroma_qp_index_offset;
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int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
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int constrained_intra_pred; ///< constrained_intra_pred_flag
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int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
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int transform_8x8_mode; ///< transform_8x8_mode_flag
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uint8_t scaling_matrix4[6][16];
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uint8_t scaling_matrix8[2][64];
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}PPS;
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/**
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* Memory management control operation opcode.
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*/
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typedef enum MMCOOpcode{
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MMCO_END=0,
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MMCO_SHORT2UNUSED,
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MMCO_LONG2UNUSED,
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MMCO_SHORT2LONG,
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MMCO_SET_MAX_LONG,
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MMCO_RESET,
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MMCO_LONG,
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} MMCOOpcode;
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/**
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* Memory management control operation.
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*/
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typedef struct MMCO{
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MMCOOpcode opcode;
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int short_frame_num;
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int long_index;
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} MMCO;
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/**
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* H264Context
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*/
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typedef struct H264Context{
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MpegEncContext s;
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int nal_ref_idc;
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int nal_unit_type;
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uint8_t *rbsp_buffer;
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unsigned int rbsp_buffer_size;
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/**
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* Used to parse AVC variant of h264
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*/
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int is_avc; ///< this flag is != 0 if codec is avc1
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int got_avcC; ///< flag used to parse avcC data only once
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int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
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int chroma_qp; //QPc
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int prev_mb_skipped;
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int next_mb_skipped;
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//prediction stuff
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int chroma_pred_mode;
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int intra16x16_pred_mode;
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int top_mb_xy;
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int left_mb_xy[2];
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int8_t intra4x4_pred_mode_cache[5*8];
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int8_t (*intra4x4_pred_mode)[8];
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void (*pred4x4 [9+3])(uint8_t *src, uint8_t *topright, int stride);//FIXME move to dsp?
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void (*pred8x8l [9+3])(uint8_t *src, int topleft, int topright, int stride);
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void (*pred8x8 [4+3])(uint8_t *src, int stride);
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void (*pred16x16[4+3])(uint8_t *src, int stride);
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unsigned int topleft_samples_available;
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unsigned int top_samples_available;
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unsigned int topright_samples_available;
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unsigned int left_samples_available;
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uint8_t (*top_borders[2])[16+2*8];
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uint8_t left_border[2*(17+2*9)];
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/**
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* non zero coeff count cache.
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* is 64 if not available.
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*/
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DECLARE_ALIGNED_8(uint8_t, non_zero_count_cache[6*8]);
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uint8_t (*non_zero_count)[16];
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/**
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* Motion vector cache.
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*/
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DECLARE_ALIGNED_8(int16_t, mv_cache[2][5*8][2]);
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DECLARE_ALIGNED_8(int8_t, ref_cache[2][5*8]);
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#define LIST_NOT_USED -1 //FIXME rename?
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#define PART_NOT_AVAILABLE -2
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/**
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* is 1 if the specific list MV&references are set to 0,0,-2.
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*/
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int mv_cache_clean[2];
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/**
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* number of neighbors (top and/or left) that used 8x8 dct
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*/
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int neighbor_transform_size;
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/**
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* block_offset[ 0..23] for frame macroblocks
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* block_offset[24..47] for field macroblocks
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*/
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int block_offset[2*(16+8)];
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uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
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uint32_t *mb2b8_xy;
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int b_stride; //FIXME use s->b4_stride
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int b8_stride;
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int mb_linesize; ///< may be equal to s->linesize or s->linesize*2, for mbaff
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int mb_uvlinesize;
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int emu_edge_width;
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int emu_edge_height;
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int halfpel_flag;
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int thirdpel_flag;
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int unknown_svq3_flag;
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int next_slice_index;
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SPS *sps_buffers[MAX_SPS_COUNT];
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SPS sps; ///< current sps
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PPS *pps_buffers[MAX_PPS_COUNT];
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/**
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* current pps
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*/
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PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?
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uint32_t dequant4_buffer[6][52][16];
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uint32_t dequant8_buffer[2][52][64];
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uint32_t (*dequant4_coeff[6])[16];
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uint32_t (*dequant8_coeff[2])[64];
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int dequant_coeff_pps; ///< reinit tables when pps changes
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int slice_num;
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uint8_t *slice_table_base;
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uint8_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
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int slice_type;
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int slice_type_fixed;
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//interlacing specific flags
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int mb_aff_frame;
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int mb_field_decoding_flag;
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int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
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unsigned int sub_mb_type[4];
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//POC stuff
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int poc_lsb;
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int poc_msb;
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int delta_poc_bottom;
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int delta_poc[2];
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int frame_num;
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int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0
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int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0
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int frame_num_offset; ///< for POC type 2
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int prev_frame_num_offset; ///< for POC type 2
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int prev_frame_num; ///< frame_num of the last pic for POC type 1/2
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/**
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* frame_num for frames or 2*frame_num for field pics.
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*/
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int curr_pic_num;
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/**
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* max_frame_num or 2*max_frame_num for field pics.
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*/
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int max_pic_num;
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//Weighted pred stuff
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int use_weight;
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int use_weight_chroma;
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int luma_log2_weight_denom;
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int chroma_log2_weight_denom;
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int luma_weight[2][48];
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int luma_offset[2][48];
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int chroma_weight[2][48][2];
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int chroma_offset[2][48][2];
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int implicit_weight[48][48];
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//deblock
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int deblocking_filter; ///< disable_deblocking_filter_idc with 1<->0
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int slice_alpha_c0_offset;
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int slice_beta_offset;
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int redundant_pic_count;
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int direct_spatial_mv_pred;
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int dist_scale_factor[16];
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int dist_scale_factor_field[32];
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int map_col_to_list0[2][16];
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int map_col_to_list0_field[2][32];
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/**
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* num_ref_idx_l0/1_active_minus1 + 1
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*/
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unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
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unsigned int list_count;
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Picture *short_ref[32];
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Picture *long_ref[32];
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Picture default_ref_list[2][32];
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Picture ref_list[2][48]; ///< 0..15: frame refs, 16..47: mbaff field refs
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Picture *delayed_pic[18]; //FIXME size?
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Picture *delayed_output_pic;
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/**
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* memory management control operations buffer.
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*/
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MMCO mmco[MAX_MMCO_COUNT];
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int mmco_index;
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int long_ref_count; ///< number of actual long term references
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int short_ref_count; ///< number of actual short term references
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//data partitioning
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GetBitContext intra_gb;
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GetBitContext inter_gb;
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GetBitContext *intra_gb_ptr;
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GetBitContext *inter_gb_ptr;
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DECLARE_ALIGNED_8(DCTELEM, mb[16*24]);
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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
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/**
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* Cabac
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*/
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CABACContext cabac;
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uint8_t cabac_state[460];
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int cabac_init_idc;
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/* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */
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uint16_t *cbp_table;
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int cbp;
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int top_cbp;
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int left_cbp;
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/* chroma_pred_mode for i4x4 or i16x16, else 0 */
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uint8_t *chroma_pred_mode_table;
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int last_qscale_diff;
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int16_t (*mvd_table[2])[2];
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DECLARE_ALIGNED_8(int16_t, mvd_cache[2][5*8][2]);
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uint8_t *direct_table;
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uint8_t direct_cache[5*8];
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uint8_t zigzag_scan[16];
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uint8_t zigzag_scan8x8[64];
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uint8_t zigzag_scan8x8_cavlc[64];
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uint8_t field_scan[16];
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uint8_t field_scan8x8[64];
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uint8_t field_scan8x8_cavlc[64];
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const uint8_t *zigzag_scan_q0;
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const uint8_t *zigzag_scan8x8_q0;
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const uint8_t *zigzag_scan8x8_cavlc_q0;
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const uint8_t *field_scan_q0;
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const uint8_t *field_scan8x8_q0;
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const uint8_t *field_scan8x8_cavlc_q0;
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int x264_build;
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}H264Context;
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#endif /* H264_H */
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