/* * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder * Copyright (c) 2003 Michael Niedermayer * * 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 libavcodec/h264.h * H.264 / AVC / MPEG4 part10 codec. * @author Michael Niedermayer */ #ifndef AVCODEC_H264_H #define AVCODEC_H264_H #include "dsputil.h" #include "cabac.h" #include "mpegvideo.h" #include "h264pred.h" #define interlaced_dct interlaced_dct_is_a_bad_name #define mb_intra mb_intra_is_not_initialized_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 #define MAX_DELAYED_PIC_COUNT 16 /* Compiling in interlaced support reduces the speed * of progressive decoding by about 2%. */ #define ALLOW_INTERLACE #define ALLOW_NOCHROMA /** * The maximum number of slices supported by the decoder. * must be a power of 2 */ #define MAX_SLICES 16 #ifdef ALLOW_INTERLACE #define MB_MBAFF h->mb_mbaff #define MB_FIELD h->mb_field_decoding_flag #define FRAME_MBAFF h->mb_aff_frame #define FIELD_PICTURE (s->picture_structure != PICT_FRAME) #else #define MB_MBAFF 0 #define MB_FIELD 0 #define FRAME_MBAFF 0 #define FIELD_PICTURE 0 #undef IS_INTERLACED #define IS_INTERLACED(mb_type) 0 #endif #define FIELD_OR_MBAFF_PICTURE (FRAME_MBAFF || FIELD_PICTURE) #ifdef ALLOW_NOCHROMA #define CHROMA h->sps.chroma_format_idc #else #define CHROMA 1 #endif #define EXTENDED_SAR 255 #define MB_TYPE_REF0 MB_TYPE_ACPRED //dirty but it fits in 16 bit #define MB_TYPE_8x8DCT 0x01000000 #define IS_REF0(a) ((a) & MB_TYPE_REF0) #define IS_8x8DCT(a) ((a) & MB_TYPE_8x8DCT) /* NAL unit types */ enum { NAL_SLICE=1, NAL_DPA, NAL_DPB, NAL_DPC, NAL_IDR_SLICE, NAL_SEI, NAL_SPS, NAL_PPS, NAL_AUD, NAL_END_SEQUENCE, NAL_END_STREAM, NAL_FILLER_DATA, NAL_SPS_EXT, NAL_AUXILIARY_SLICE=19 }; /** * SEI message types */ typedef enum { SEI_BUFFERING_PERIOD = 0, ///< buffering period (H.264, D.1.1) SEI_TYPE_PIC_TIMING = 1, ///< picture timing SEI_TYPE_USER_DATA_UNREGISTERED = 5, ///< unregistered user data SEI_TYPE_RECOVERY_POINT = 6 ///< recovery point (frame # to decoder sync) } SEI_Type; /** * pic_struct in picture timing SEI message */ typedef enum { SEI_PIC_STRUCT_FRAME = 0, ///< 0: %frame SEI_PIC_STRUCT_TOP_FIELD = 1, ///< 1: top field SEI_PIC_STRUCT_BOTTOM_FIELD = 2, ///< 2: bottom field SEI_PIC_STRUCT_TOP_BOTTOM = 3, ///< 3: top field, bottom field, in that order SEI_PIC_STRUCT_BOTTOM_TOP = 4, ///< 4: bottom field, top field, in that order SEI_PIC_STRUCT_TOP_BOTTOM_TOP = 5, ///< 5: top field, bottom field, top field repeated, in that order SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///< 6: bottom field, top field, bottom field repeated, in that order SEI_PIC_STRUCT_FRAME_DOUBLING = 7, ///< 7: %frame doubling SEI_PIC_STRUCT_FRAME_TRIPLING = 8 ///< 8: %frame tripling } SEI_PicStructType; /** * Sequence parameter set */ typedef struct SPS{ int profile_idc; int level_idc; int chroma_format_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; ///< pic_width_in_mbs_minus1 + 1 int mb_height; ///< pic_height_in_map_units_minus1 + 1 int frame_mbs_only_flag; int mb_aff; ///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; uint16_t *slice_table_base; uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1 int slice_type; int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P) 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 uint16_t 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+1 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[2][32]; int map_col_to_list0[2][16+32]; int map_col_to_list0_field[2][2][16+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]; ///< base reference list for all slices of a coded picture Picture ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs. Reordered version of default_ref_list according to picture reordering in slice header */ int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1 Picture *delayed_pic[MAX_DELAYED_PIC_COUNT+2]; //FIXME size? int outputed_poc; /** * 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_16(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 too 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; /** * @defgroup multithreading Members for slice based multithreading * @{ */ struct H264Context *thread_context[MAX_THREADS]; /** * current slice number, used to initalize slice_num of each thread/context */ int current_slice; /** * Max number of threads / contexts. * This is equal to AVCodecContext.thread_count unless * multithreaded decoding is impossible, in which case it is * reduced to 1. */ int max_contexts; /** * 1 if the single thread fallback warning has already been * displayed, 0 otherwise. */ int single_decode_warning; int last_slice_type; /** @} */ int mb_xy; uint32_t svq3_watermark_key; /** * pic_struct in picture timing SEI message */ SEI_PicStructType sei_pic_struct; /** * dpb_output_delay in picture timing SEI message, see H.264 C.2.2 */ int sei_dpb_output_delay; /** * cpb_removal_delay in picture timing SEI message, see H.264 C.1.2 */ int sei_cpb_removal_delay; /** * recovery_frame_cnt from SEI message * * Set to -1 if no recovery point SEI message found or to number of frames * before playback synchronizes. Frames having recovery point are key * frames. */ int sei_recovery_frame_cnt; int is_complex; int luma_weight_flag[2]; ///< 7.4.3.2 luma_weight_lX_flag int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag // Timestamp stuff int sei_buffering_period_present; ///< Buffering period SEI flag int initial_cpb_removal_delay[32]; ///< Initial timestamps for CPBs }H264Context; /** * Decode SEI */ int ff_h264_decode_sei(H264Context *h); /** * Decode SPS */ int ff_h264_decode_seq_parameter_set(H264Context *h); /** * Decode PPS */ int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length); /** * Decodes a network abstraction layer unit. * @param consumed is the number of bytes used as input * @param length is the length of the array * @param dst_length is the number of decoded bytes FIXME here or a decode rbsp tailing? * @returns decoded bytes, might be src+1 if no escapes */ const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src, int *dst_length, int *consumed, int length); /** * identifies the exact end of the bitstream * @return the length of the trailing, or 0 if damaged */ int ff_h264_decode_rbsp_trailing(H264Context *h, const uint8_t *src); #endif /* AVCODEC_H264_H */