/* * 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 */ /** * @file * H.264 parameter set handling */ #ifndef AVCODEC_H264_PS_H #define AVCODEC_H264_PS_H #include <stdint.h> #include "libavutil/buffer.h" #include "libavutil/pixfmt.h" #include "libavutil/rational.h" #include "avcodec.h" #include "get_bits.h" #include "h264.h" #define MAX_SPS_COUNT 32 #define MAX_PPS_COUNT 256 /** * Sequence parameter set */ typedef struct SPS { unsigned int sps_id; 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 ///< (pic_height_in_map_units_minus1 + 1) * (2 - frame_mbs_only_flag) int mb_height; int frame_mbs_only_flag; int mb_aff; ///< mb_adaptive_frame_field_flag int direct_8x8_inference_flag; int crop; ///< frame_cropping_flag /* those 4 are already in luma samples */ unsigned int crop_left; ///< frame_cropping_rect_left_offset unsigned int crop_right; ///< frame_cropping_rect_right_offset unsigned int crop_top; ///< frame_cropping_rect_top_offset unsigned int crop_bottom; ///< frame_cropping_rect_bottom_offset int vui_parameters_present_flag; AVRational sar; int video_signal_type_present_flag; int full_range; int colour_description_present_flag; enum AVColorPrimaries color_primaries; enum AVColorTransferCharacteristic color_trc; enum AVColorSpace colorspace; int timing_info_present_flag; uint32_t num_units_in_tick; uint32_t time_scale; int fixed_frame_rate_flag; short offset_for_ref_frame[256]; // FIXME dyn aloc? int bitstream_restriction_flag; int num_reorder_frames; int scaling_matrix_present; uint8_t scaling_matrix4[6][16]; uint8_t scaling_matrix8[6][64]; int nal_hrd_parameters_present_flag; int vcl_hrd_parameters_present_flag; int pic_struct_present_flag; int time_offset_length; int cpb_cnt; ///< See H.264 E.1.2 int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 + 1 int cpb_removal_delay_length; ///< cpb_removal_delay_length_minus1 + 1 int dpb_output_delay_length; ///< dpb_output_delay_length_minus1 + 1 int bit_depth_luma; ///< bit_depth_luma_minus8 + 8 int bit_depth_chroma; ///< bit_depth_chroma_minus8 + 8 int residual_color_transform_flag; ///< residual_colour_transform_flag int constraint_set_flags; ///< constraint_set[0-3]_flag } SPS; /** * Picture parameter set */ typedef struct PPS { unsigned int sps_id; int cabac; ///< entropy_coding_mode_flag int pic_order_present; ///< pic_order_present_flag int slice_group_count; ///< num_slice_groups_minus1 + 1 int mb_slice_group_map_type; unsigned int ref_count[2]; ///< num_ref_idx_l0/1_active_minus1 + 1 int weighted_pred; ///< weighted_pred_flag int weighted_bipred_idc; int init_qp; ///< pic_init_qp_minus26 + 26 int init_qs; ///< pic_init_qs_minus26 + 26 int chroma_qp_index_offset[2]; int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag int constrained_intra_pred; ///< constrained_intra_pred_flag int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag int transform_8x8_mode; ///< transform_8x8_mode_flag uint8_t scaling_matrix4[6][16]; uint8_t scaling_matrix8[6][64]; uint8_t chroma_qp_table[2][64]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table int chroma_qp_diff; uint32_t dequant4_buffer[6][QP_MAX_NUM + 1][16]; uint32_t dequant8_buffer[6][QP_MAX_NUM + 1][64]; uint32_t(*dequant4_coeff[6])[16]; uint32_t(*dequant8_coeff[6])[64]; } PPS; typedef struct H264ParamSets { AVBufferRef *sps_list[MAX_SPS_COUNT]; AVBufferRef *pps_list[MAX_PPS_COUNT]; /* currently active parameters sets */ const PPS *pps; // FIXME this should properly be const SPS *sps; } H264ParamSets; /** * Decode SPS */ int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps); /** * Decode PPS */ int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx, H264ParamSets *ps, int bit_length); #endif /* AVCODEC_H264_PS_H */