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   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * Libav is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 /**
  20  * @file
  21  * H.264 parameter set handling
  22  */
  23
  24 #ifndef AVCODEC_H264_PS_H
  25 #define AVCODEC_H264_PS_H
  26
  27 #include <stdint.h>
  28
  29 #include "libavutil/buffer.h"
  30 #include "libavutil/pixfmt.h"
  31 #include "libavutil/rational.h"
  32
  33 #include "avcodec.h"
  34 #include "get_bits.h"
  35 #include "h264.h"
  36
  37 #define MAX_SPS_COUNT          32
  38 #define MAX_PPS_COUNT         256
  39
  40 /**
  41  * Sequence parameter set
  42  */
  43 typedef struct SPS {
  44     unsigned int sps_id;
  45     int profile_idc;
  46     int level_idc;
  47     int chroma_format_idc;
  48     int transform_bypass;              ///< qpprime_y_zero_transform_bypass_flag
  49     int log2_max_frame_num;            ///< log2_max_frame_num_minus4 + 4
  50     int poc_type;                      ///< pic_order_cnt_type
  51     int log2_max_poc_lsb;              ///< log2_max_pic_order_cnt_lsb_minus4
  52     int delta_pic_order_always_zero_flag;
  53     int offset_for_non_ref_pic;
  54     int offset_for_top_to_bottom_field;
  55     int poc_cycle_length;              ///< num_ref_frames_in_pic_order_cnt_cycle
  56     int ref_frame_count;               ///< num_ref_frames
  57     int gaps_in_frame_num_allowed_flag;
  58     int mb_width;                      ///< pic_width_in_mbs_minus1 + 1
  59     ///< (pic_height_in_map_units_minus1 + 1) * (2 - frame_mbs_only_flag)
  60     int mb_height;
  61     int frame_mbs_only_flag;
  62     int mb_aff;                        ///< mb_adaptive_frame_field_flag
  63     int direct_8x8_inference_flag;
  64     int crop;                          ///< frame_cropping_flag
  65
  66     /* those 4 are already in luma samples */
  67     unsigned int crop_left;            ///< frame_cropping_rect_left_offset
  68     unsigned int crop_right;           ///< frame_cropping_rect_right_offset
  69     unsigned int crop_top;             ///< frame_cropping_rect_top_offset
  70     unsigned int crop_bottom;          ///< frame_cropping_rect_bottom_offset
  71     int vui_parameters_present_flag;
  72     AVRational sar;
  73     int video_signal_type_present_flag;
  74     int full_range;
  75     int colour_description_present_flag;
  76     enum AVColorPrimaries color_primaries;
  77     enum AVColorTransferCharacteristic color_trc;
  78     enum AVColorSpace colorspace;
  79     int timing_info_present_flag;
  80     uint32_t num_units_in_tick;
  81     uint32_t time_scale;
  82     int fixed_frame_rate_flag;
  83     short offset_for_ref_frame[256]; // FIXME dyn aloc?
  84     int bitstream_restriction_flag;
  85     int num_reorder_frames;
  86     int scaling_matrix_present;
  87     uint8_t scaling_matrix4[6][16];
  88     uint8_t scaling_matrix8[6][64];
  89     int nal_hrd_parameters_present_flag;
  90     int vcl_hrd_parameters_present_flag;
  91     int pic_struct_present_flag;
  92     int time_offset_length;
  93     int cpb_cnt;                          ///< See H.264 E.1.2
  94     int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 + 1
  95     int cpb_removal_delay_length;         ///< cpb_removal_delay_length_minus1 + 1
  96     int dpb_output_delay_length;          ///< dpb_output_delay_length_minus1 + 1
  97     int bit_depth_luma;                   ///< bit_depth_luma_minus8 + 8
  98     int bit_depth_chroma;                 ///< bit_depth_chroma_minus8 + 8
  99     int residual_color_transform_flag;    ///< residual_colour_transform_flag
 100     int constraint_set_flags;             ///< constraint_set[0-3]_flag
 101 } SPS;
 102
 103 /**
 104  * Picture parameter set
 105  */
 106 typedef struct PPS {
 107     unsigned int sps_id;
 108     int cabac;                  ///< entropy_coding_mode_flag
 109     int pic_order_present;      ///< pic_order_present_flag
 110     int slice_group_count;      ///< num_slice_groups_minus1 + 1
 111     int mb_slice_group_map_type;
 112     unsigned int ref_count[2];  ///< num_ref_idx_l0/1_active_minus1 + 1
 113     int weighted_pred;          ///< weighted_pred_flag
 114     int weighted_bipred_idc;
 115     int init_qp;                ///< pic_init_qp_minus26 + 26
 116     int init_qs;                ///< pic_init_qs_minus26 + 26
 117     int chroma_qp_index_offset[2];
 118     int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
 119     int constrained_intra_pred;     ///< constrained_intra_pred_flag
 120     int redundant_pic_cnt_present;  ///< redundant_pic_cnt_present_flag
 121     int transform_8x8_mode;         ///< transform_8x8_mode_flag
 122     uint8_t scaling_matrix4[6][16];
 123     uint8_t scaling_matrix8[6][64];
 124     uint8_t chroma_qp_table[2][64]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
 125     int chroma_qp_diff;
 126
 127     uint32_t dequant4_buffer[6][QP_MAX_NUM + 1][16];
 128     uint32_t dequant8_buffer[6][QP_MAX_NUM + 1][64];
 129     uint32_t(*dequant4_coeff[6])[16];
 130     uint32_t(*dequant8_coeff[6])[64];
 131 } PPS;
 132
 133 typedef struct H264ParamSets {
 134     AVBufferRef *sps_list[MAX_SPS_COUNT];
 135     AVBufferRef *pps_list[MAX_PPS_COUNT];
 136
 137     /* currently active parameters sets */
 138     const PPS *pps;
 139     // FIXME this should properly be const
 140     SPS *sps;
 141 } H264ParamSets;
 142
 143 /**
 144  * Decode SPS
 145  */
 146 int ff_h264_decode_seq_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
 147                                      H264ParamSets *ps);
 148
 149 /**
 150  * Decode PPS
 151  */
 152 int ff_h264_decode_picture_parameter_set(GetBitContext *gb, AVCodecContext *avctx,
 153                                          H264ParamSets *ps, int bit_length);
 154
 155 #endif /* AVCODEC_H264_PS_H */