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/* |
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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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36933907 |
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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36933907 |
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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