mirror of
https://git.ffmpeg.org/ffmpeg.git
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d05444d2c6
With comments describing the derivation of each value.
(cherry picked from commit aaf4414650)
93 lines
3.2 KiB
C
93 lines
3.2 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* H.264 common definitions
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*/
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#ifndef AVCODEC_H264_H
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#define AVCODEC_H264_H
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#define QP_MAX_NUM (51 + 6*6) // The maximum supported qp
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/* NAL unit types */
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enum {
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H264_NAL_SLICE = 1,
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H264_NAL_DPA = 2,
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H264_NAL_DPB = 3,
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H264_NAL_DPC = 4,
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H264_NAL_IDR_SLICE = 5,
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H264_NAL_SEI = 6,
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H264_NAL_SPS = 7,
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H264_NAL_PPS = 8,
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H264_NAL_AUD = 9,
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H264_NAL_END_SEQUENCE = 10,
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H264_NAL_END_STREAM = 11,
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H264_NAL_FILLER_DATA = 12,
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H264_NAL_SPS_EXT = 13,
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H264_NAL_AUXILIARY_SLICE = 19,
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};
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enum {
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// 7.4.2.1.1: seq_parameter_set_id is in [0, 31].
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H264_MAX_SPS_COUNT = 32,
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// 7.4.2.2: pic_parameter_set_id is in [0, 255].
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H264_MAX_PPS_COUNT = 256,
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// A.3: MaxDpbFrames is bounded above by 16.
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H264_MAX_DPB_FRAMES = 16,
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// 7.4.2.1.1: max_num_ref_frames is in [0, MaxDpbFrames], and
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// each reference frame can have two fields.
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H264_MAX_REFS = 2 * H264_MAX_DPB_FRAMES,
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// 7.4.3.1: modification_of_pic_nums_idc is not equal to 3 at most
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// num_ref_idx_lN_active_minus1 + 1 times (that is, once for each
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// possible reference), then equal to 3 once.
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H264_MAX_RPLM_COUNT = H264_MAX_REFS + 1,
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// 7.4.3.3: in the worst case, we begin with a full short-term
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// reference picture list. Each picture in turn is moved to the
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// long-term list (type 3) and then discarded from there (type 2).
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// Then, we set the length of the long-term list (type 4), mark
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// the current picture as long-term (type 6) and terminate the
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// process (type 0).
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H264_MAX_MMCO_COUNT = H264_MAX_REFS * 2 + 3,
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// A.2.1, A.2.3: profiles supporting FMO constrain
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// num_slice_groups_minus1 to be in [0, 7].
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H264_MAX_SLICE_GROUPS = 8,
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// E.2.2: cpb_cnt_minus1 is in [0, 31].
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H264_MAX_CPB_CNT = 32,
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// A.3: in table A-1 the highest level allows a MaxFS of 139264.
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H264_MAX_MB_PIC_SIZE = 139264,
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// A.3.1, A.3.2: PicWidthInMbs and PicHeightInMbs are constrained
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// to be not greater than sqrt(MaxFS * 8). Hence height/width are
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// bounded above by sqrt(139264 * 8) = 1055.5 macroblocks.
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H264_MAX_MB_WIDTH = 1055,
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H264_MAX_MB_HEIGHT = 1055,
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H264_MAX_WIDTH = H264_MAX_MB_WIDTH * 16,
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H264_MAX_HEIGHT = H264_MAX_MB_HEIGHT * 16,
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};
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#endif /* AVCODEC_H264_H */
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