dd1e804a98
MB_TYPE_ACPRED is currently reused for MB_TYPE_REF0 by H.264, so that the value fits into an uint16_t. Given that MB_TYPE_ACPRED is not subject to any such restriction (apart from fitting into 32bits), it can be remapped to a hithereto unused bit. The then available bit will be declared to be codec-specific (i.e. unused by generic code), so that H.264 can use it for MB_TYPE_REF0 and so that it can be reused later for e.g. MB_TYPE_H261_FIL. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
137 lines
4.7 KiB
C
137 lines
4.7 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 decoder/parser shared code
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*/
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#ifndef AVCODEC_H264_PARSE_H
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#define AVCODEC_H264_PARSE_H
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#include "config.h"
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#include <stdint.h>
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#include "libavutil/attributes.h"
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#include "get_bits.h"
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#include "h264_ps.h"
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#define MB_TYPE_REF0 MB_TYPE_CODEC_SPECIFIC
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#define MB_TYPE_8x8DCT 0x01000000
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// This table must be here because scan8[constant] must be known at compiletime
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static const uint8_t scan8[16 * 3 + 3] = {
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4 + 1 * 8, 5 + 1 * 8, 4 + 2 * 8, 5 + 2 * 8,
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6 + 1 * 8, 7 + 1 * 8, 6 + 2 * 8, 7 + 2 * 8,
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4 + 3 * 8, 5 + 3 * 8, 4 + 4 * 8, 5 + 4 * 8,
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6 + 3 * 8, 7 + 3 * 8, 6 + 4 * 8, 7 + 4 * 8,
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4 + 6 * 8, 5 + 6 * 8, 4 + 7 * 8, 5 + 7 * 8,
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6 + 6 * 8, 7 + 6 * 8, 6 + 7 * 8, 7 + 7 * 8,
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4 + 8 * 8, 5 + 8 * 8, 4 + 9 * 8, 5 + 9 * 8,
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6 + 8 * 8, 7 + 8 * 8, 6 + 9 * 8, 7 + 9 * 8,
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4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,
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6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,
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4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,
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6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,
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0 + 0 * 8, 0 + 5 * 8, 0 + 10 * 8
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};
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/**
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* Memory management control operation opcode.
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*/
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typedef enum MMCOOpcode {
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MMCO_END = 0,
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MMCO_SHORT2UNUSED,
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MMCO_LONG2UNUSED,
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MMCO_SHORT2LONG,
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MMCO_SET_MAX_LONG,
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MMCO_RESET,
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MMCO_LONG,
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} MMCOOpcode;
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typedef struct H264PredWeightTable {
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int use_weight;
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int use_weight_chroma;
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int luma_log2_weight_denom;
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int chroma_log2_weight_denom;
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int luma_weight_flag[2]; ///< 7.4.3.2 luma_weight_lX_flag
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int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag
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// The following 2 can be changed to int8_t but that causes a 10 CPU cycles speed loss
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int luma_weight[48][2][2];
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int chroma_weight[48][2][2][2];
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int implicit_weight[48][48][2];
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} H264PredWeightTable;
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typedef struct H264POCContext {
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int poc_lsb;
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int poc_msb;
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int delta_poc_bottom;
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int delta_poc[2];
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int frame_num;
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int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0
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int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0
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int frame_num_offset; ///< for POC type 2
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int prev_frame_num_offset; ///< for POC type 2
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int prev_frame_num; ///< frame_num of the last pic for POC type 1/2
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} H264POCContext;
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int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
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const int *ref_count, int slice_type_nos,
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H264PredWeightTable *pwt,
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int picture_structure, void *logctx);
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/**
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* Check if the top & left blocks are available if needed & change the
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* dc mode so it only uses the available blocks.
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*/
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int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
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int top_samples_available, int left_samples_available);
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/**
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* Check if the top & left blocks are available if needed & change the
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* dc mode so it only uses the available blocks.
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*/
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int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
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int left_samples_available,
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int mode, int is_chroma);
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int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
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GetBitContext *gb, const PPS *pps,
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int slice_type_nos, int picture_structure, void *logctx);
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int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
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const SPS *sps, H264POCContext *poc,
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int picture_structure, int nal_ref_idc);
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int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps,
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int *is_avc, int *nal_length_size,
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int err_recognition, void *logctx);
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static av_always_inline uint32_t pack16to32(unsigned a, unsigned b)
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{
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#if HAVE_BIGENDIAN
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return (b & 0xFFFF) + (a << 16);
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#else
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return (a & 0xFFFF) + (b << 16);
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#endif
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}
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#endif /* AVCODEC_H264_PARSE_H */
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