/* * 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 common definitions */ #ifndef AVCODEC_H264_H #define AVCODEC_H264_H #define QP_MAX_NUM (51 + 2 * 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 */