/*

  * 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 common definitions
  */
 
 #ifndef AVCODEC_H264_H
 #define AVCODEC_H264_H
 

 #define QP_MAX_NUM (51 + 6*6)           // The maximum supported qp

 /* NAL unit types */
 enum {

     H264_NAL_SLICE           = 1,
     H264_NAL_DPA             = 2,
     H264_NAL_DPB             = 3,
     H264_NAL_DPC             = 4,
     H264_NAL_IDR_SLICE       = 5,
     H264_NAL_SEI             = 6,
     H264_NAL_SPS             = 7,
     H264_NAL_PPS             = 8,
     H264_NAL_AUD             = 9,
     H264_NAL_END_SEQUENCE    = 10,
     H264_NAL_END_STREAM      = 11,
     H264_NAL_FILLER_DATA     = 12,
     H264_NAL_SPS_EXT         = 13,
     H264_NAL_AUXILIARY_SLICE = 19,

 };
 

 
 enum {
     // 7.4.2.1.1: seq_parameter_set_id is in [0, 31].
     H264_MAX_SPS_COUNT = 32,
     // 7.4.2.2: pic_parameter_set_id is in [0, 255].
     H264_MAX_PPS_COUNT = 256,
 
     // A.3: MaxDpbFrames is bounded above by 16.
     H264_MAX_DPB_FRAMES = 16,
     // 7.4.2.1.1: max_num_ref_frames is in [0, MaxDpbFrames], and
     // each reference frame can have two fields.
     H264_MAX_REFS       = 2 * H264_MAX_DPB_FRAMES,
 
     // 7.4.3.1: modification_of_pic_nums_idc is not equal to 3 at most
     // num_ref_idx_lN_active_minus1 + 1 times (that is, once for each
     // possible reference), then equal to 3 once.
     H264_MAX_RPLM_COUNT = H264_MAX_REFS + 1,
 
     // 7.4.3.3: in the worst case, we begin with a full short-term
     // reference picture list.  Each picture in turn is moved to the
     // long-term list (type 3) and then discarded from there (type 2).
     // Then, we set the length of the long-term list (type 4), mark
     // the current picture as long-term (type 6) and terminate the
     // process (type 0).
     H264_MAX_MMCO_COUNT = H264_MAX_REFS * 2 + 3,
 
     // A.2.1, A.2.3: profiles supporting FMO constrain
     // num_slice_groups_minus1 to be in [0, 7].
     H264_MAX_SLICE_GROUPS = 8,
 
     // E.2.2: cpb_cnt_minus1 is in [0, 31].
     H264_MAX_CPB_CNT = 32,
 
     // A.3: in table A-1 the highest level allows a MaxFS of 139264.
     H264_MAX_MB_PIC_SIZE = 139264,
     // A.3.1, A.3.2: PicWidthInMbs and PicHeightInMbs are constrained
     // to be not greater than sqrt(MaxFS * 8).  Hence height/width are
     // bounded above by sqrt(139264 * 8) = 1055.5 macroblocks.
     H264_MAX_MB_WIDTH    = 1055,
     H264_MAX_MB_HEIGHT   = 1055,
     H264_MAX_WIDTH       = H264_MAX_MB_WIDTH  * 16,
     H264_MAX_HEIGHT      = H264_MAX_MB_HEIGHT * 16,
 };
 
 

 #endif /* AVCODEC_H264_H */