/* * 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 * H.264 decoder/parser shared code */ #ifndef AVCODEC_H264_PARSE_H #define AVCODEC_H264_PARSE_H #include "config.h" #include #include "libavutil/attributes.h" #include "get_bits.h" #include "h264_ps.h" // This table must be here because scan8[constant] must be known at compiletime static const uint8_t scan8[16 * 3 + 3] = { 4 + 1 * 8, 5 + 1 * 8, 4 + 2 * 8, 5 + 2 * 8, 6 + 1 * 8, 7 + 1 * 8, 6 + 2 * 8, 7 + 2 * 8, 4 + 3 * 8, 5 + 3 * 8, 4 + 4 * 8, 5 + 4 * 8, 6 + 3 * 8, 7 + 3 * 8, 6 + 4 * 8, 7 + 4 * 8, 4 + 6 * 8, 5 + 6 * 8, 4 + 7 * 8, 5 + 7 * 8, 6 + 6 * 8, 7 + 6 * 8, 6 + 7 * 8, 7 + 7 * 8, 4 + 8 * 8, 5 + 8 * 8, 4 + 9 * 8, 5 + 9 * 8, 6 + 8 * 8, 7 + 8 * 8, 6 + 9 * 8, 7 + 9 * 8, 4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8, 6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8, 4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8, 6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8, 0 + 0 * 8, 0 + 5 * 8, 0 + 10 * 8 }; /** * Memory management control operation opcode. */ typedef enum MMCOOpcode { MMCO_END = 0, MMCO_SHORT2UNUSED, MMCO_LONG2UNUSED, MMCO_SHORT2LONG, MMCO_SET_MAX_LONG, MMCO_RESET, MMCO_LONG, } MMCOOpcode; typedef struct H264PredWeightTable { int use_weight; int use_weight_chroma; int luma_log2_weight_denom; int chroma_log2_weight_denom; 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 // The following 2 can be changed to int8_t but that causes a 10 CPU cycles speed loss int luma_weight[48][2][2]; int chroma_weight[48][2][2][2]; int implicit_weight[48][48][2]; } H264PredWeightTable; typedef struct H264POCContext { 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 } H264POCContext; int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, const int *ref_count, int slice_type_nos, H264PredWeightTable *pwt, int picture_structure, void *logctx); /** * Check if the top & left blocks are available if needed & change the * dc mode so it only uses the available blocks. */ int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx, int top_samples_available, int left_samples_available); /** * Check if the top & left blocks are available if needed & change the * dc mode so it only uses the available blocks. */ int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available, int left_samples_available, int mode, int is_chroma); int ff_h264_parse_ref_count(int *plist_count, int ref_count[2], GetBitContext *gb, const PPS *pps, int slice_type_nos, int picture_structure, void *logctx); int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc, const SPS *sps, H264POCContext *poc, int picture_structure, int nal_ref_idc); int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps, int *is_avc, int *nal_length_size, int err_recognition, void *logctx); /** * compute profile from sps */ int ff_h264_get_profile(const SPS *sps); static av_always_inline uint32_t pack16to32(unsigned a, unsigned b) { #if HAVE_BIGENDIAN return (b & 0xFFFF) + (a << 16); #else return (a & 0xFFFF) + (b << 16); #endif } #endif /* AVCODEC_H264_PARSE_H */