/* * HEVC video decoder * * Copyright (C) 2012 - 2013 Guillaume Martres * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_HEVCDEC_H #define AVCODEC_HEVCDEC_H #include #include #include "libavutil/buffer.h" #include "libavutil/md5.h" #include "avcodec.h" #include "bswapdsp.h" #include "cabac.h" #include "get_bits.h" #include "h2645_parse.h" #include "hevc.h" #include "hevc_ps.h" #include "hevcdsp.h" #include "internal.h" #include "thread.h" #include "videodsp.h" //TODO: check if this is really the maximum #define MAX_TRANSFORM_DEPTH 5 #define MAX_TB_SIZE 32 #define MAX_PB_SIZE 64 #define MAX_QP 51 #define DEFAULT_INTRA_TC_OFFSET 2 #define HEVC_CONTEXTS 183 #define MRG_MAX_NUM_CANDS 5 #define L0 0 #define L1 1 #define EPEL_EXTRA_BEFORE 1 #define EPEL_EXTRA_AFTER 2 #define EPEL_EXTRA 3 #define EDGE_EMU_BUFFER_STRIDE 80 /** * Value of the luma sample at position (x, y) in the 2D array tab. */ #define SAMPLE(tab, x, y) ((tab)[(y) * s->sps->width + (x)]) #define SAMPLE_CTB(tab, x, y) ((tab)[(y) * min_cb_width + (x)]) #define IS_IDR(s) (s->nal_unit_type == HEVC_NAL_IDR_W_RADL || s->nal_unit_type == HEVC_NAL_IDR_N_LP) #define IS_BLA(s) (s->nal_unit_type == HEVC_NAL_BLA_W_RADL || s->nal_unit_type == HEVC_NAL_BLA_W_LP || \ s->nal_unit_type == HEVC_NAL_BLA_N_LP) #define IS_IRAP(s) (s->nal_unit_type >= 16 && s->nal_unit_type <= 23) #define FFUDIV(a,b) (((a) > 0 ? (a) : (a) - (b) + 1) / (b)) #define FFUMOD(a,b) ((a) - (b) * FFUDIV(a,b)) enum RPSType { ST_CURR_BEF = 0, ST_CURR_AFT, ST_FOLL, LT_CURR, LT_FOLL, NB_RPS_TYPE, }; enum SliceType { B_SLICE = 0, P_SLICE = 1, I_SLICE = 2, }; enum SyntaxElement { SAO_MERGE_FLAG = 0, SAO_TYPE_IDX, SAO_EO_CLASS, SAO_BAND_POSITION, SAO_OFFSET_ABS, SAO_OFFSET_SIGN, END_OF_SLICE_FLAG, SPLIT_CODING_UNIT_FLAG, CU_TRANSQUANT_BYPASS_FLAG, SKIP_FLAG, CU_QP_DELTA, PRED_MODE_FLAG, PART_MODE, PCM_FLAG, PREV_INTRA_LUMA_PRED_FLAG, MPM_IDX, REM_INTRA_LUMA_PRED_MODE, INTRA_CHROMA_PRED_MODE, MERGE_FLAG, MERGE_IDX, INTER_PRED_IDC, REF_IDX_L0, REF_IDX_L1, ABS_MVD_GREATER0_FLAG, ABS_MVD_GREATER1_FLAG, ABS_MVD_MINUS2, MVD_SIGN_FLAG, MVP_LX_FLAG, NO_RESIDUAL_DATA_FLAG, SPLIT_TRANSFORM_FLAG, CBF_LUMA, CBF_CB_CR, TRANSFORM_SKIP_FLAG, LAST_SIGNIFICANT_COEFF_X_PREFIX, LAST_SIGNIFICANT_COEFF_Y_PREFIX, LAST_SIGNIFICANT_COEFF_X_SUFFIX, LAST_SIGNIFICANT_COEFF_Y_SUFFIX, SIGNIFICANT_COEFF_GROUP_FLAG, SIGNIFICANT_COEFF_FLAG, COEFF_ABS_LEVEL_GREATER1_FLAG, COEFF_ABS_LEVEL_GREATER2_FLAG, COEFF_ABS_LEVEL_REMAINING, COEFF_SIGN_FLAG, }; enum PartMode { PART_2Nx2N = 0, PART_2NxN = 1, PART_Nx2N = 2, PART_NxN = 3, PART_2NxnU = 4, PART_2NxnD = 5, PART_nLx2N = 6, PART_nRx2N = 7, }; enum PredMode { MODE_INTER = 0, MODE_INTRA, MODE_SKIP, }; enum InterPredIdc { PRED_L0 = 0, PRED_L1, PRED_BI, }; enum IntraPredMode { INTRA_PLANAR = 0, INTRA_DC, INTRA_ANGULAR_2, INTRA_ANGULAR_3, INTRA_ANGULAR_4, INTRA_ANGULAR_5, INTRA_ANGULAR_6, INTRA_ANGULAR_7, INTRA_ANGULAR_8, INTRA_ANGULAR_9, INTRA_ANGULAR_10, INTRA_ANGULAR_11, INTRA_ANGULAR_12, INTRA_ANGULAR_13, INTRA_ANGULAR_14, INTRA_ANGULAR_15, INTRA_ANGULAR_16, INTRA_ANGULAR_17, INTRA_ANGULAR_18, INTRA_ANGULAR_19, INTRA_ANGULAR_20, INTRA_ANGULAR_21, INTRA_ANGULAR_22, INTRA_ANGULAR_23, INTRA_ANGULAR_24, INTRA_ANGULAR_25, INTRA_ANGULAR_26, INTRA_ANGULAR_27, INTRA_ANGULAR_28, INTRA_ANGULAR_29, INTRA_ANGULAR_30, INTRA_ANGULAR_31, INTRA_ANGULAR_32, INTRA_ANGULAR_33, INTRA_ANGULAR_34, }; enum SAOType { SAO_NOT_APPLIED = 0, SAO_BAND, SAO_EDGE, }; enum SAOEOClass { SAO_EO_HORIZ = 0, SAO_EO_VERT, SAO_EO_135D, SAO_EO_45D, }; enum ScanType { SCAN_DIAG = 0, SCAN_HORIZ, SCAN_VERT, }; typedef struct LongTermRPS { int poc[32]; uint8_t used[32]; uint8_t nb_refs; } LongTermRPS; typedef struct RefPicList { struct HEVCFrame *ref[HEVC_MAX_REFS]; int list[HEVC_MAX_REFS]; int isLongTerm[HEVC_MAX_REFS]; int nb_refs; } RefPicList; typedef struct RefPicListTab { RefPicList refPicList[2]; } RefPicListTab; typedef struct SliceHeader { unsigned int pps_id; ///< address (in raster order) of the first block in the current slice segment unsigned int slice_segment_addr; ///< address (in raster order) of the first block in the current slice unsigned int slice_addr; enum SliceType slice_type; int pic_order_cnt_lsb; uint8_t first_slice_in_pic_flag; uint8_t dependent_slice_segment_flag; uint8_t pic_output_flag; uint8_t colour_plane_id; ///< RPS coded in the slice header itself is stored here int short_term_ref_pic_set_sps_flag; int short_term_ref_pic_set_size; ShortTermRPS slice_rps; const ShortTermRPS *short_term_rps; int long_term_ref_pic_set_size; LongTermRPS long_term_rps; unsigned int list_entry_lx[2][32]; uint8_t rpl_modification_flag[2]; uint8_t no_output_of_prior_pics_flag; uint8_t slice_temporal_mvp_enabled_flag; unsigned int nb_refs[2]; uint8_t slice_sample_adaptive_offset_flag[3]; uint8_t mvd_l1_zero_flag; uint8_t cabac_init_flag; uint8_t disable_deblocking_filter_flag; ///< slice_header_disable_deblocking_filter_flag uint8_t slice_loop_filter_across_slices_enabled_flag; uint8_t collocated_list; unsigned int collocated_ref_idx; int slice_qp_delta; int slice_cb_qp_offset; int slice_cr_qp_offset; int beta_offset; ///< beta_offset_div2 * 2 int tc_offset; ///< tc_offset_div2 * 2 unsigned int max_num_merge_cand; ///< 5 - 5_minus_max_num_merge_cand int num_entry_point_offsets; int8_t slice_qp; uint8_t luma_log2_weight_denom; int16_t chroma_log2_weight_denom; int16_t luma_weight_l0[16]; int16_t chroma_weight_l0[16][2]; int16_t chroma_weight_l1[16][2]; int16_t luma_weight_l1[16]; int16_t luma_offset_l0[16]; int16_t chroma_offset_l0[16][2]; int16_t luma_offset_l1[16]; int16_t chroma_offset_l1[16][2]; int slice_ctb_addr_rs; } SliceHeader; typedef struct CodingTree { int depth; ///< ctDepth } CodingTree; typedef struct CodingUnit { int x; int y; enum PredMode pred_mode; ///< PredMode enum PartMode part_mode; ///< PartMode // Inferred parameters uint8_t intra_split_flag; ///< IntraSplitFlag uint8_t max_trafo_depth; ///< MaxTrafoDepth uint8_t cu_transquant_bypass_flag; } CodingUnit; typedef struct Mv { int16_t x; ///< horizontal component of motion vector int16_t y; ///< vertical component of motion vector } Mv; typedef struct MvField { DECLARE_ALIGNED(4, Mv, mv)[2]; int8_t ref_idx[2]; int8_t pred_flag[2]; uint8_t is_intra; } MvField; typedef struct NeighbourAvailable { int cand_bottom_left; int cand_left; int cand_up; int cand_up_left; int cand_up_right; int cand_up_right_sap; } NeighbourAvailable; typedef struct PredictionUnit { int mpm_idx; int rem_intra_luma_pred_mode; uint8_t intra_pred_mode[4]; Mv mvd; uint8_t merge_flag; uint8_t intra_pred_mode_c; } PredictionUnit; typedef struct TransformUnit { int cu_qp_delta; // Inferred parameters; int cur_intra_pred_mode; uint8_t is_cu_qp_delta_coded; } TransformUnit; typedef struct DBParams { int beta_offset; int tc_offset; } DBParams; #define HEVC_FRAME_FLAG_OUTPUT (1 << 0) #define HEVC_FRAME_FLAG_SHORT_REF (1 << 1) #define HEVC_FRAME_FLAG_LONG_REF (1 << 2) typedef struct HEVCFrame { AVFrame *frame; ThreadFrame tf; MvField *tab_mvf; RefPicList *refPicList; RefPicListTab **rpl_tab; int ctb_count; int poc; struct HEVCFrame *collocated_ref; HEVCWindow window; AVBufferRef *tab_mvf_buf; AVBufferRef *rpl_tab_buf; AVBufferRef *rpl_buf; AVBufferRef *hwaccel_priv_buf; void *hwaccel_picture_private; /** * A sequence counter, so that old frames are output first * after a POC reset */ uint16_t sequence; /** * A combination of HEVC_FRAME_FLAG_* */ uint8_t flags; } HEVCFrame; struct HEVCContext; typedef struct HEVCPredContext { void (*intra_pred[4])(struct HEVCContext *s, int x0, int y0, int c_idx); void (*pred_planar[4])(uint8_t *src, const uint8_t *top, const uint8_t *left, ptrdiff_t stride); void (*pred_dc)(uint8_t *src, const uint8_t *top, const uint8_t *left, ptrdiff_t stride, int log2_size, int c_idx); void (*pred_angular[4])(uint8_t *src, const uint8_t *top, const uint8_t *left, ptrdiff_t stride, int c_idx, int mode); } HEVCPredContext; typedef struct HEVCLocalContext { DECLARE_ALIGNED(16, int16_t, mc_buffer[(MAX_PB_SIZE + 24) * MAX_PB_SIZE]); uint8_t cabac_state[HEVC_CONTEXTS]; uint8_t first_qp_group; GetBitContext gb; CABACContext cc; int8_t qp_y; int8_t curr_qp_y; TransformUnit tu; uint8_t ctb_left_flag; uint8_t ctb_up_flag; uint8_t ctb_up_right_flag; uint8_t ctb_up_left_flag; int start_of_tiles_x; int end_of_tiles_x; int end_of_tiles_y; /* +7 is for subpixel interpolation, *2 for high bit depths */ DECLARE_ALIGNED(32, uint8_t, edge_emu_buffer)[(MAX_PB_SIZE + 7) * EDGE_EMU_BUFFER_STRIDE * 2]; CodingTree ct; CodingUnit cu; PredictionUnit pu; NeighbourAvailable na; #define BOUNDARY_LEFT_SLICE (1 << 0) #define BOUNDARY_LEFT_TILE (1 << 1) #define BOUNDARY_UPPER_SLICE (1 << 2) #define BOUNDARY_UPPER_TILE (1 << 3) /* properties of the boundary of the current CTB for the purposes * of the deblocking filter */ int boundary_flags; } HEVCLocalContext; typedef struct HEVCContext { const AVClass *c; // needed by private avoptions AVCodecContext *avctx; HEVCLocalContext HEVClc; uint8_t cabac_state[HEVC_CONTEXTS]; /** 1 if the independent slice segment header was successfully parsed */ uint8_t slice_initialized; AVFrame *frame; AVFrame *sao_frame; AVFrame *tmp_frame; AVFrame *output_frame; HEVCParamSets ps; AVBufferPool *tab_mvf_pool; AVBufferPool *rpl_tab_pool; ///< candidate references for the current frame RefPicList rps[5]; SliceHeader sh; SAOParams *sao; DBParams *deblock; enum HEVCNALUnitType nal_unit_type; int temporal_id; ///< temporal_id_plus1 - 1 HEVCFrame *ref; HEVCFrame DPB[32]; int poc; int pocTid0; int slice_idx; ///< number of the slice being currently decoded int eos; ///< current packet contains an EOS/EOB NAL int max_ra; int bs_width; int bs_height; int is_decoded; HEVCPredContext hpc; HEVCDSPContext hevcdsp; VideoDSPContext vdsp; BswapDSPContext bdsp; int8_t *qp_y_tab; uint8_t *horizontal_bs; uint8_t *vertical_bs; int32_t *tab_slice_address; // CU uint8_t *skip_flag; uint8_t *tab_ct_depth; // PU uint8_t *tab_ipm; uint8_t *cbf_luma; // cbf_luma of colocated TU uint8_t *is_pcm; // CTB-level flags affecting loop filter operation uint8_t *filter_slice_edges; /** used on BE to byteswap the lines for checksumming */ uint8_t *checksum_buf; int checksum_buf_size; /** * Sequence counters for decoded and output frames, so that old * frames are output first after a POC reset */ uint16_t seq_decode; uint16_t seq_output; H2645Packet pkt; // type of the first VCL NAL of the current frame enum HEVCNALUnitType first_nal_type; // for checking the frame checksums struct AVMD5 *md5_ctx; uint8_t md5[3][16]; uint8_t is_md5; uint8_t context_initialized; uint8_t is_nalff; ///< this flag is != 0 if bitstream is encapsulated ///< as a format defined in 14496-15 int apply_defdispwin; int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4) int nuh_layer_id; /** frame packing arrangement variables */ int sei_frame_packing_present; int frame_packing_arrangement_type; int content_interpretation_type; int quincunx_subsampling; /** display orientation */ int sei_display_orientation_present; int sei_anticlockwise_rotation; int sei_hflip, sei_vflip; } HEVCContext; int ff_hevc_decode_nal_sei(HEVCContext *s); /** * Mark all frames in DPB as unused for reference. */ void ff_hevc_clear_refs(HEVCContext *s); /** * Drop all frames currently in DPB. */ void ff_hevc_flush_dpb(HEVCContext *s); /** * Compute POC of the current frame and return it. */ int ff_hevc_compute_poc(HEVCContext *s, int poc_lsb); RefPicList *ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *frame, int x0, int y0); /** * Construct the reference picture sets for the current frame. */ int ff_hevc_frame_rps(HEVCContext *s); /** * Construct the reference picture list(s) for the current slice. */ int ff_hevc_slice_rpl(HEVCContext *s); void ff_hevc_save_states(HEVCContext *s, int ctb_addr_ts); void ff_hevc_cabac_init(HEVCContext *s, int ctb_addr_ts); int ff_hevc_sao_merge_flag_decode(HEVCContext *s); int ff_hevc_sao_type_idx_decode(HEVCContext *s); int ff_hevc_sao_band_position_decode(HEVCContext *s); int ff_hevc_sao_offset_abs_decode(HEVCContext *s); int ff_hevc_sao_offset_sign_decode(HEVCContext *s); int ff_hevc_sao_eo_class_decode(HEVCContext *s); int ff_hevc_end_of_slice_flag_decode(HEVCContext *s); int ff_hevc_cu_transquant_bypass_flag_decode(HEVCContext *s); int ff_hevc_skip_flag_decode(HEVCContext *s, int x0, int y0, int x_cb, int y_cb); int ff_hevc_pred_mode_decode(HEVCContext *s); int ff_hevc_split_coding_unit_flag_decode(HEVCContext *s, int ct_depth, int x0, int y0); int ff_hevc_part_mode_decode(HEVCContext *s, int log2_cb_size); int ff_hevc_pcm_flag_decode(HEVCContext *s); int ff_hevc_prev_intra_luma_pred_flag_decode(HEVCContext *s); int ff_hevc_mpm_idx_decode(HEVCContext *s); int ff_hevc_rem_intra_luma_pred_mode_decode(HEVCContext *s); int ff_hevc_intra_chroma_pred_mode_decode(HEVCContext *s); int ff_hevc_merge_idx_decode(HEVCContext *s); int ff_hevc_merge_flag_decode(HEVCContext *s); int ff_hevc_inter_pred_idc_decode(HEVCContext *s, int nPbW, int nPbH); int ff_hevc_ref_idx_lx_decode(HEVCContext *s, int num_ref_idx_lx); int ff_hevc_mvp_lx_flag_decode(HEVCContext *s); int ff_hevc_no_residual_syntax_flag_decode(HEVCContext *s); int ff_hevc_abs_mvd_greater0_flag_decode(HEVCContext *s); int ff_hevc_abs_mvd_greater1_flag_decode(HEVCContext *s); int ff_hevc_mvd_decode(HEVCContext *s); int ff_hevc_mvd_sign_flag_decode(HEVCContext *s); int ff_hevc_split_transform_flag_decode(HEVCContext *s, int log2_trafo_size); int ff_hevc_cbf_cb_cr_decode(HEVCContext *s, int trafo_depth); int ff_hevc_cbf_luma_decode(HEVCContext *s, int trafo_depth); int ff_hevc_transform_skip_flag_decode(HEVCContext *s, int c_idx); int ff_hevc_last_significant_coeff_x_prefix_decode(HEVCContext *s, int c_idx, int log2_size); int ff_hevc_last_significant_coeff_y_prefix_decode(HEVCContext *s, int c_idx, int log2_size); int ff_hevc_last_significant_coeff_suffix_decode(HEVCContext *s, int last_significant_coeff_prefix); int ff_hevc_significant_coeff_group_flag_decode(HEVCContext *s, int c_idx, int ctx_cg); int ff_hevc_significant_coeff_flag_decode(HEVCContext *s, int c_idx, int x_c, int y_c, int log2_trafo_size, int scan_idx, int prev_sig); int ff_hevc_coeff_abs_level_greater1_flag_decode(HEVCContext *s, int c_idx, int ctx_set); int ff_hevc_coeff_abs_level_greater2_flag_decode(HEVCContext *s, int c_idx, int inc); int ff_hevc_coeff_abs_level_remaining(HEVCContext *s, int base_level, int rc_rice_param); int ff_hevc_coeff_sign_flag(HEVCContext *s, uint8_t nb); /** * Get the number of candidate references for the current frame. */ int ff_hevc_frame_nb_refs(HEVCContext *s); int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc); /** * Find next frame in output order and put a reference to it in frame. * @return 1 if a frame was output, 0 otherwise */ int ff_hevc_output_frame(HEVCContext *s, AVFrame *frame, int flush); void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags); void ff_hevc_set_neighbour_available(HEVCContext *s, int x0, int y0, int nPbW, int nPbH); void ff_hevc_luma_mv_merge_mode(HEVCContext *s, int x0, int y0, int nPbW, int nPbH, int log2_cb_size, int part_idx, int merge_idx, MvField *mv); void ff_hevc_luma_mv_mvp_mode(HEVCContext *s, int x0, int y0, int nPbW, int nPbH, int log2_cb_size, int part_idx, int merge_idx, MvField *mv, int mvp_lx_flag, int LX); void ff_hevc_set_qPy(HEVCContext *s, int xC, int yC, int xBase, int yBase, int log2_cb_size); void ff_hevc_deblocking_boundary_strengths(HEVCContext *s, int x0, int y0, int log2_trafo_size); int ff_hevc_cu_qp_delta_sign_flag(HEVCContext *s); int ff_hevc_cu_qp_delta_abs(HEVCContext *s); void ff_hevc_hls_filter(HEVCContext *s, int x, int y); void ff_hevc_hls_filters(HEVCContext *s, int x_ctb, int y_ctb, int ctb_size); void ff_hevc_pred_init(HEVCPredContext *hpc, int bit_depth); extern const uint8_t ff_hevc_qpel_extra_before[4]; extern const uint8_t ff_hevc_qpel_extra_after[4]; extern const uint8_t ff_hevc_qpel_extra[4]; #endif /* AVCODEC_HEVCDEC_H */