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/*
* 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 decoder/parser shared code
*/
#ifndef AVCODEC_H264_PARSE_H
#define AVCODEC_H264_PARSE_H
#include "config.h"
#include <stdint.h>
#include "libavutil/attributes.h"
#include "get_bits.h"
#include "h264_ps.h"
#define MB_TYPE_REF0 MB_TYPE_ACPRED // dirty but it fits in 16 bit
#define MB_TYPE_8x8DCT 0x01000000
// This table must be here because scan8[constant] must be known at compiletime
static const uint8_t scan8[16 * 3 + 3] = {
4 + 1 * 8, 5 + 1 * 8, 4 + 2 * 8, 5 + 2 * 8,
6 + 1 * 8, 7 + 1 * 8, 6 + 2 * 8, 7 + 2 * 8,
4 + 3 * 8, 5 + 3 * 8, 4 + 4 * 8, 5 + 4 * 8,
6 + 3 * 8, 7 + 3 * 8, 6 + 4 * 8, 7 + 4 * 8,
4 + 6 * 8, 5 + 6 * 8, 4 + 7 * 8, 5 + 7 * 8,
6 + 6 * 8, 7 + 6 * 8, 6 + 7 * 8, 7 + 7 * 8,
4 + 8 * 8, 5 + 8 * 8, 4 + 9 * 8, 5 + 9 * 8,
6 + 8 * 8, 7 + 8 * 8, 6 + 9 * 8, 7 + 9 * 8,
4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,
6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,
4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,
6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,
0 + 0 * 8, 0 + 5 * 8, 0 + 10 * 8
};
/**
* Memory management control operation opcode.
*/
typedef enum MMCOOpcode {
MMCO_END = 0,
MMCO_SHORT2UNUSED,
MMCO_LONG2UNUSED,
MMCO_SHORT2LONG,
MMCO_SET_MAX_LONG,
MMCO_RESET,
MMCO_LONG,
} MMCOOpcode;
typedef struct H264PredWeightTable {
int use_weight;
int use_weight_chroma;
int luma_log2_weight_denom;
int chroma_log2_weight_denom;
int luma_weight_flag[2]; ///< 7.4.3.2 luma_weight_lX_flag
int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag
// The following 2 can be changed to int8_t but that causes a 10 CPU cycles speed loss
int luma_weight[48][2][2];
int chroma_weight[48][2][2][2];
int implicit_weight[48][48][2];
} H264PredWeightTable;
typedef struct H264POCContext {
int poc_lsb;
int poc_msb;
int delta_poc_bottom;
int delta_poc[2];
int frame_num;
int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0
int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0
int frame_num_offset; ///< for POC type 2
int prev_frame_num_offset; ///< for POC type 2
int prev_frame_num; ///< frame_num of the last pic for POC type 1/2
} H264POCContext;
int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
const int *ref_count, int slice_type_nos,
H264PredWeightTable *pwt,
int picture_structure, void *logctx);
/**
* Check if the top & left blocks are available if needed & change the
* dc mode so it only uses the available blocks.
*/
int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
int top_samples_available, int left_samples_available);
/**
* Check if the top & left blocks are available if needed & change the
* dc mode so it only uses the available blocks.
*/
int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
int left_samples_available,
int mode, int is_chroma);
int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
GetBitContext *gb, const PPS *pps,
int slice_type_nos, int picture_structure, void *logctx);
int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
const SPS *sps, H264POCContext *poc,
int picture_structure, int nal_ref_idc);
int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps,
int *is_avc, int *nal_length_size,
int err_recognition, void *logctx);
static av_always_inline uint32_t pack16to32(unsigned a, unsigned b)
{
#if HAVE_BIGENDIAN
return (b & 0xFFFF) + (a << 16);
#else
return (a & 0xFFFF) + (b << 16);
#endif
}
#endif /* AVCODEC_H264_PARSE_H */
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