2 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * H.264 / AVC / MPEG4 part10 codec.
25 * @author Michael Niedermayer <michaelni@gmx.at>
33 #include "mpegvideo.h"
36 #define interlaced_dct interlaced_dct_is_a_bad_name
37 #define mb_intra mb_intra_is_not_initialized_see_mb_type
39 #define LUMA_DC_BLOCK_INDEX 25
40 #define CHROMA_DC_BLOCK_INDEX 26
42 #define CHROMA_DC_COEFF_TOKEN_VLC_BITS 8
43 #define COEFF_TOKEN_VLC_BITS 8
44 #define TOTAL_ZEROS_VLC_BITS 9
45 #define CHROMA_DC_TOTAL_ZEROS_VLC_BITS 3
46 #define RUN_VLC_BITS 3
47 #define RUN7_VLC_BITS 6
49 #define MAX_SPS_COUNT 32
50 #define MAX_PPS_COUNT 256
52 #define MAX_MMCO_COUNT 66
54 #define MAX_DELAYED_PIC_COUNT 16
56 /* Compiling in interlaced support reduces the speed
57 * of progressive decoding by about 2%. */
58 #define ALLOW_INTERLACE
60 #ifdef ALLOW_INTERLACE
61 #define MB_MBAFF h->mb_mbaff
62 #define MB_FIELD h->mb_field_decoding_flag
63 #define FRAME_MBAFF h->mb_aff_frame
64 #define FIELD_PICTURE (s->picture_structure != PICT_FRAME)
69 #define FIELD_PICTURE 0
71 #define IS_INTERLACED(mb_type) 0
73 #define FIELD_OR_MBAFF_PICTURE (FRAME_MBAFF || FIELD_PICTURE)
75 #ifndef ENABLE_H264_ENCODER
76 #define ENABLE_H264_ENCODER 0
80 * Sequence parameter set
86 int transform_bypass; ///< qpprime_y_zero_transform_bypass_flag
87 int log2_max_frame_num; ///< log2_max_frame_num_minus4 + 4
88 int poc_type; ///< pic_order_cnt_type
89 int log2_max_poc_lsb; ///< log2_max_pic_order_cnt_lsb_minus4
90 int delta_pic_order_always_zero_flag;
91 int offset_for_non_ref_pic;
92 int offset_for_top_to_bottom_field;
93 int poc_cycle_length; ///< num_ref_frames_in_pic_order_cnt_cycle
94 int ref_frame_count; ///< num_ref_frames
95 int gaps_in_frame_num_allowed_flag;
96 int mb_width; ///< pic_width_in_mbs_minus1 + 1
97 int mb_height; ///< pic_height_in_map_units_minus1 + 1
98 int frame_mbs_only_flag;
99 int mb_aff; ///<mb_adaptive_frame_field_flag
100 int direct_8x8_inference_flag;
101 int crop; ///< frame_cropping_flag
102 unsigned int crop_left; ///< frame_cropping_rect_left_offset
103 unsigned int crop_right; ///< frame_cropping_rect_right_offset
104 unsigned int crop_top; ///< frame_cropping_rect_top_offset
105 unsigned int crop_bottom; ///< frame_cropping_rect_bottom_offset
106 int vui_parameters_present_flag;
108 int timing_info_present_flag;
109 uint32_t num_units_in_tick;
111 int fixed_frame_rate_flag;
112 short offset_for_ref_frame[256]; //FIXME dyn aloc?
113 int bitstream_restriction_flag;
114 int num_reorder_frames;
115 int scaling_matrix_present;
116 uint8_t scaling_matrix4[6][16];
117 uint8_t scaling_matrix8[2][64];
121 * Picture parameter set
125 int cabac; ///< entropy_coding_mode_flag
126 int pic_order_present; ///< pic_order_present_flag
127 int slice_group_count; ///< num_slice_groups_minus1 + 1
128 int mb_slice_group_map_type;
129 unsigned int ref_count[2]; ///< num_ref_idx_l0/1_active_minus1 + 1
130 int weighted_pred; ///< weighted_pred_flag
131 int weighted_bipred_idc;
132 int init_qp; ///< pic_init_qp_minus26 + 26
133 int init_qs; ///< pic_init_qs_minus26 + 26
134 int chroma_qp_index_offset[2];
135 int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
136 int constrained_intra_pred; ///< constrained_intra_pred_flag
137 int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
138 int transform_8x8_mode; ///< transform_8x8_mode_flag
139 uint8_t scaling_matrix4[6][16];
140 uint8_t scaling_matrix8[2][64];
141 uint8_t chroma_qp_table[2][64]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
146 * Memory management control operation opcode.
148 typedef enum MMCOOpcode{
159 * Memory management control operation.
163 int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
164 int long_arg; ///< index, pic_num, or num long refs depending on opcode
170 typedef struct H264Context{
174 uint8_t *rbsp_buffer[2];
175 unsigned int rbsp_buffer_size[2];
178 * Used to parse AVC variant of h264
180 int is_avc; ///< this flag is != 0 if codec is avc1
181 int got_avcC; ///< flag used to parse avcC data only once
182 int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
184 int chroma_qp[2]; //QPc
190 int chroma_pred_mode;
191 int intra16x16_pred_mode;
196 int8_t intra4x4_pred_mode_cache[5*8];
197 int8_t (*intra4x4_pred_mode)[8];
199 unsigned int topleft_samples_available;
200 unsigned int top_samples_available;
201 unsigned int topright_samples_available;
202 unsigned int left_samples_available;
203 uint8_t (*top_borders[2])[16+2*8];
204 uint8_t left_border[2*(17+2*9)];
207 * non zero coeff count cache.
208 * is 64 if not available.
210 DECLARE_ALIGNED_8(uint8_t, non_zero_count_cache[6*8]);
211 uint8_t (*non_zero_count)[16];
214 * Motion vector cache.
216 DECLARE_ALIGNED_8(int16_t, mv_cache[2][5*8][2]);
217 DECLARE_ALIGNED_8(int8_t, ref_cache[2][5*8]);
218 #define LIST_NOT_USED -1 //FIXME rename?
219 #define PART_NOT_AVAILABLE -2
222 * is 1 if the specific list MV&references are set to 0,0,-2.
224 int mv_cache_clean[2];
227 * number of neighbors (top and/or left) that used 8x8 dct
229 int neighbor_transform_size;
232 * block_offset[ 0..23] for frame macroblocks
233 * block_offset[24..47] for field macroblocks
235 int block_offset[2*(16+8)];
237 uint32_t *mb2b_xy; //FIXME are these 4 a good idea?
239 int b_stride; //FIXME use s->b4_stride
242 int mb_linesize; ///< may be equal to s->linesize or s->linesize*2, for mbaff
251 int unknown_svq3_flag;
252 int next_slice_index;
254 SPS *sps_buffers[MAX_SPS_COUNT];
255 SPS sps; ///< current sps
257 PPS *pps_buffers[MAX_PPS_COUNT];
261 PPS pps; //FIXME move to Picture perhaps? (->no) do we need that?
263 uint32_t dequant4_buffer[6][52][16];
264 uint32_t dequant8_buffer[2][52][64];
265 uint32_t (*dequant4_coeff[6])[16];
266 uint32_t (*dequant8_coeff[2])[64];
267 int dequant_coeff_pps; ///< reinit tables when pps changes
270 uint8_t *slice_table_base;
271 uint8_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
273 int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
274 int slice_type_fixed;
276 //interlacing specific flags
278 int mb_field_decoding_flag;
279 int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
281 unsigned int sub_mb_type[4];
286 int delta_poc_bottom;
289 int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0
290 int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0
291 int frame_num_offset; ///< for POC type 2
292 int prev_frame_num_offset; ///< for POC type 2
293 int prev_frame_num; ///< frame_num of the last pic for POC type 1/2
296 * frame_num for frames or 2*frame_num+1 for field pics.
301 * max_frame_num or 2*max_frame_num for field pics.
305 //Weighted pred stuff
307 int use_weight_chroma;
308 int luma_log2_weight_denom;
309 int chroma_log2_weight_denom;
310 int luma_weight[2][48];
311 int luma_offset[2][48];
312 int chroma_weight[2][48][2];
313 int chroma_offset[2][48][2];
314 int implicit_weight[48][48];
317 int deblocking_filter; ///< disable_deblocking_filter_idc with 1<->0
318 int slice_alpha_c0_offset;
319 int slice_beta_offset;
321 int redundant_pic_count;
323 int direct_spatial_mv_pred;
324 int dist_scale_factor[16];
325 int dist_scale_factor_field[32];
326 int map_col_to_list0[2][16];
327 int map_col_to_list0_field[2][32];
330 * num_ref_idx_l0/1_active_minus1 + 1
332 unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
333 unsigned int list_count;
334 Picture *short_ref[32];
335 Picture *long_ref[32];
336 Picture default_ref_list[2][32]; ///< base reference list for all slices of a coded picture
337 Picture ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
338 Reordered version of default_ref_list
339 according to picture reordering in slice header */
340 int ref2frm[16][2][48+2]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
341 Picture *delayed_pic[MAX_DELAYED_PIC_COUNT+2]; //FIXME size?
345 * memory management control operations buffer.
347 MMCO mmco[MAX_MMCO_COUNT];
350 int long_ref_count; ///< number of actual long term references
351 int short_ref_count; ///< number of actual short term references
354 GetBitContext intra_gb;
355 GetBitContext inter_gb;
356 GetBitContext *intra_gb_ptr;
357 GetBitContext *inter_gb_ptr;
359 DECLARE_ALIGNED_16(DCTELEM, mb[16*24]);
360 DCTELEM mb_padding[256]; ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either check that i is not too large or ensure that there is some unused stuff after mb
366 uint8_t cabac_state[460];
369 /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0,1,2), 0x0? luma_cbp */
374 /* chroma_pred_mode for i4x4 or i16x16, else 0 */
375 uint8_t *chroma_pred_mode_table;
376 int last_qscale_diff;
377 int16_t (*mvd_table[2])[2];
378 DECLARE_ALIGNED_8(int16_t, mvd_cache[2][5*8][2]);
379 uint8_t *direct_table;
380 uint8_t direct_cache[5*8];
382 uint8_t zigzag_scan[16];
383 uint8_t zigzag_scan8x8[64];
384 uint8_t zigzag_scan8x8_cavlc[64];
385 uint8_t field_scan[16];
386 uint8_t field_scan8x8[64];
387 uint8_t field_scan8x8_cavlc[64];
388 const uint8_t *zigzag_scan_q0;
389 const uint8_t *zigzag_scan8x8_q0;
390 const uint8_t *zigzag_scan8x8_cavlc_q0;
391 const uint8_t *field_scan_q0;
392 const uint8_t *field_scan8x8_q0;
393 const uint8_t *field_scan8x8_cavlc_q0;
398 * @defgroup multithreading Members for slice based multithreading
401 struct H264Context *thread_context[MAX_THREADS];
404 * current slice number, used to initalize slice_num of each thread/context
409 * Max number of threads / contexts.
410 * This is equal to AVCodecContext.thread_count unless
411 * multithreaded decoding is impossible, in which case it is
417 * 1 if the single thread fallback warning has already been
418 * displayed, 0 otherwise.
420 int single_decode_warning;
429 #endif /* FFMPEG_H264_H */