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>
28 #ifndef AVCODEC_H264_H
29 #define AVCODEC_H264_H
31 #include "libavutil/intreadwrite.h"
33 #include "error_resilience.h"
35 #include "h264chroma.h"
39 #include "internal.h" // for avpriv_find_start_code()
41 #include "mpegutils.h"
44 #include "rectangle.h"
47 #define H264_MAX_PICTURE_COUNT 36
48 #define H264_MAX_THREADS 32
50 #define MAX_SPS_COUNT 32
51 #define MAX_PPS_COUNT 256
53 #define MAX_MMCO_COUNT 66
55 #define MAX_DELAYED_PIC_COUNT 16
57 #define MAX_MBPAIR_SIZE (256*1024) // a tighter bound could be calculated if someone cares about a few bytes
59 /* Compiling in interlaced support reduces the speed
60 * of progressive decoding by about 2%. */
61 #define ALLOW_INTERLACE
66 * The maximum number of slices supported by the decoder.
67 * must be a power of 2
71 #ifdef ALLOW_INTERLACE
72 #define MB_MBAFF(h) (h)->mb_mbaff
73 #define MB_FIELD(h) (h)->mb_field_decoding_flag
74 #define FRAME_MBAFF(h) (h)->mb_aff_frame
75 #define FIELD_PICTURE(h) ((h)->picture_structure != PICT_FRAME)
83 #define FRAME_MBAFF(h) 0
84 #define FIELD_PICTURE(h) 0
86 #define IS_INTERLACED(mb_type) 0
92 #define FIELD_OR_MBAFF_PICTURE(h) (FRAME_MBAFF(h) || FIELD_PICTURE(h))
95 #define CABAC(h) (h)->pps.cabac
98 #define CHROMA(h) ((h)->sps.chroma_format_idc)
99 #define CHROMA422(h) ((h)->sps.chroma_format_idc == 2)
100 #define CHROMA444(h) ((h)->sps.chroma_format_idc == 3)
102 #define EXTENDED_SAR 255
104 #define MB_TYPE_REF0 MB_TYPE_ACPRED // dirty but it fits in 16 bit
105 #define MB_TYPE_8x8DCT 0x01000000
106 #define IS_REF0(a) ((a) & MB_TYPE_REF0)
107 #define IS_8x8DCT(a) ((a) & MB_TYPE_8x8DCT)
109 #define QP_MAX_NUM (51 + 6*6) // The maximum supported qp
122 NAL_END_SEQUENCE = 10,
124 NAL_FILLER_DATA = 12,
126 NAL_AUXILIARY_SLICE = 19,
127 NAL_FF_IGNORE = 0xff0f001,
134 SEI_TYPE_BUFFERING_PERIOD = 0, ///< buffering period (H.264, D.1.1)
135 SEI_TYPE_PIC_TIMING = 1, ///< picture timing
136 SEI_TYPE_USER_DATA_ITU_T_T35 = 4, ///< user data registered by ITU-T Recommendation T.35
137 SEI_TYPE_USER_DATA_UNREGISTERED = 5, ///< unregistered user data
138 SEI_TYPE_RECOVERY_POINT = 6, ///< recovery point (frame # to decoder sync)
139 SEI_TYPE_FRAME_PACKING = 45, ///< frame packing arrangement
140 SEI_TYPE_DISPLAY_ORIENTATION = 47, ///< display orientation
144 * pic_struct in picture timing SEI message
147 SEI_PIC_STRUCT_FRAME = 0, ///< 0: %frame
148 SEI_PIC_STRUCT_TOP_FIELD = 1, ///< 1: top field
149 SEI_PIC_STRUCT_BOTTOM_FIELD = 2, ///< 2: bottom field
150 SEI_PIC_STRUCT_TOP_BOTTOM = 3, ///< 3: top field, bottom field, in that order
151 SEI_PIC_STRUCT_BOTTOM_TOP = 4, ///< 4: bottom field, top field, in that order
152 SEI_PIC_STRUCT_TOP_BOTTOM_TOP = 5, ///< 5: top field, bottom field, top field repeated, in that order
153 SEI_PIC_STRUCT_BOTTOM_TOP_BOTTOM = 6, ///< 6: bottom field, top field, bottom field repeated, in that order
154 SEI_PIC_STRUCT_FRAME_DOUBLING = 7, ///< 7: %frame doubling
155 SEI_PIC_STRUCT_FRAME_TRIPLING = 8 ///< 8: %frame tripling
159 * frame_packing_arrangement types
162 SEI_FPA_TYPE_CHECKERBOARD = 0,
163 SEI_FPA_TYPE_INTERLEAVE_COLUMN = 1,
164 SEI_FPA_TYPE_INTERLEAVE_ROW = 2,
165 SEI_FPA_TYPE_SIDE_BY_SIDE = 3,
166 SEI_FPA_TYPE_TOP_BOTTOM = 4,
167 SEI_FPA_TYPE_INTERLEAVE_TEMPORAL = 5,
172 * Sequence parameter set
178 int chroma_format_idc;
179 int transform_bypass; ///< qpprime_y_zero_transform_bypass_flag
180 int log2_max_frame_num; ///< log2_max_frame_num_minus4 + 4
181 int poc_type; ///< pic_order_cnt_type
182 int log2_max_poc_lsb; ///< log2_max_pic_order_cnt_lsb_minus4
183 int delta_pic_order_always_zero_flag;
184 int offset_for_non_ref_pic;
185 int offset_for_top_to_bottom_field;
186 int poc_cycle_length; ///< num_ref_frames_in_pic_order_cnt_cycle
187 int ref_frame_count; ///< num_ref_frames
188 int gaps_in_frame_num_allowed_flag;
189 int mb_width; ///< pic_width_in_mbs_minus1 + 1
190 int mb_height; ///< pic_height_in_map_units_minus1 + 1
191 int frame_mbs_only_flag;
192 int mb_aff; ///< mb_adaptive_frame_field_flag
193 int direct_8x8_inference_flag;
194 int crop; ///< frame_cropping_flag
196 /* those 4 are already in luma samples */
197 unsigned int crop_left; ///< frame_cropping_rect_left_offset
198 unsigned int crop_right; ///< frame_cropping_rect_right_offset
199 unsigned int crop_top; ///< frame_cropping_rect_top_offset
200 unsigned int crop_bottom; ///< frame_cropping_rect_bottom_offset
201 int vui_parameters_present_flag;
203 int video_signal_type_present_flag;
205 int colour_description_present_flag;
206 enum AVColorPrimaries color_primaries;
207 enum AVColorTransferCharacteristic color_trc;
208 enum AVColorSpace colorspace;
209 int timing_info_present_flag;
210 uint32_t num_units_in_tick;
212 int fixed_frame_rate_flag;
213 short offset_for_ref_frame[256]; // FIXME dyn aloc?
214 int bitstream_restriction_flag;
215 int num_reorder_frames;
216 int scaling_matrix_present;
217 uint8_t scaling_matrix4[6][16];
218 uint8_t scaling_matrix8[6][64];
219 int nal_hrd_parameters_present_flag;
220 int vcl_hrd_parameters_present_flag;
221 int pic_struct_present_flag;
222 int time_offset_length;
223 int cpb_cnt; ///< See H.264 E.1.2
224 int initial_cpb_removal_delay_length; ///< initial_cpb_removal_delay_length_minus1 + 1
225 int cpb_removal_delay_length; ///< cpb_removal_delay_length_minus1 + 1
226 int dpb_output_delay_length; ///< dpb_output_delay_length_minus1 + 1
227 int bit_depth_luma; ///< bit_depth_luma_minus8 + 8
228 int bit_depth_chroma; ///< bit_depth_chroma_minus8 + 8
229 int residual_color_transform_flag; ///< residual_colour_transform_flag
230 int constraint_set_flags; ///< constraint_set[0-3]_flag
231 int new; ///< flag to keep track if the decoder context needs re-init due to changed SPS
235 * Picture parameter set
239 int cabac; ///< entropy_coding_mode_flag
240 int pic_order_present; ///< pic_order_present_flag
241 int slice_group_count; ///< num_slice_groups_minus1 + 1
242 int mb_slice_group_map_type;
243 unsigned int ref_count[2]; ///< num_ref_idx_l0/1_active_minus1 + 1
244 int weighted_pred; ///< weighted_pred_flag
245 int weighted_bipred_idc;
246 int init_qp; ///< pic_init_qp_minus26 + 26
247 int init_qs; ///< pic_init_qs_minus26 + 26
248 int chroma_qp_index_offset[2];
249 int deblocking_filter_parameters_present; ///< deblocking_filter_parameters_present_flag
250 int constrained_intra_pred; ///< constrained_intra_pred_flag
251 int redundant_pic_cnt_present; ///< redundant_pic_cnt_present_flag
252 int transform_8x8_mode; ///< transform_8x8_mode_flag
253 uint8_t scaling_matrix4[6][16];
254 uint8_t scaling_matrix8[6][64];
255 uint8_t chroma_qp_table[2][QP_MAX_NUM+1]; ///< pre-scaled (with chroma_qp_index_offset) version of qp_table
260 * Frame Packing Arrangement Type
263 int frame_packing_arrangement_id;
264 int frame_packing_arrangement_cancel_flag; ///< is previous arrangement canceled, -1 if never received
265 SEI_FpaType frame_packing_arrangement_type;
266 int frame_packing_arrangement_repetition_period;
267 int content_interpretation_type;
268 int quincunx_sampling_flag;
272 * Memory management control operation opcode.
274 typedef enum MMCOOpcode {
285 * Memory management control operation.
287 typedef struct MMCO {
289 int short_pic_num; ///< pic_num without wrapping (pic_num & max_pic_num)
290 int long_arg; ///< index, pic_num, or num long refs depending on opcode
293 typedef struct H264Picture {
295 uint8_t avframe_padding[1024]; // hack to allow linking to a avutil with larger AVFrame
298 AVBufferRef *qscale_table_buf;
299 int8_t *qscale_table;
301 AVBufferRef *motion_val_buf[2];
302 int16_t (*motion_val[2])[2];
304 AVBufferRef *mb_type_buf;
307 AVBufferRef *hwaccel_priv_buf;
308 void *hwaccel_picture_private; ///< hardware accelerator private data
310 AVBufferRef *ref_index_buf[2];
311 int8_t *ref_index[2];
313 int field_poc[2]; ///< top/bottom POC
314 int poc; ///< frame POC
315 int frame_num; ///< frame_num (raw frame_num from slice header)
316 int mmco_reset; /**< MMCO_RESET set this 1. Reordering code must
317 not mix pictures before and after MMCO_RESET. */
318 int pic_id; /**< pic_num (short -> no wrap version of pic_num,
319 pic_num & max_pic_num; long -> long_pic_num) */
320 int long_ref; ///< 1->long term reference 0->short term reference
321 int ref_poc[2][2][32]; ///< POCs of the frames/fields used as reference (FIXME need per slice)
322 int ref_count[2][2]; ///< number of entries in ref_poc (FIXME need per slice)
323 int mbaff; ///< 1 -> MBAFF frame 0-> not MBAFF
324 int field_picture; ///< whether or not picture was encoded in separate fields
326 int needs_realloc; ///< picture needs to be reallocated (eg due to a frame size change)
328 int recovered; ///< picture at IDR or recovery point + recovery count
330 int sei_recovery_frame_cnt;
340 typedef struct H264Context {
342 AVCodecContext *avctx;
344 VideoDSPContext vdsp;
345 H264DSPContext h264dsp;
346 H264ChromaContext h264chroma;
347 H264QpelContext h264qpel;
348 ParseContext parse_context;
353 H264Picture *cur_pic_ptr;
355 H264Picture last_pic_for_ec;
357 int pixel_shift; ///< 0 for 8-bit H264, 1 for high-bit-depth H264
358 int chroma_qp[2]; // QPc
360 int qp_thresh; ///< QP threshold to skip loopfilter
362 /* coded dimensions -- 16 * mb w/h */
364 ptrdiff_t linesize, uvlinesize;
365 int chroma_x_shift, chroma_y_shift;
369 int data_partitioning;
370 int coded_picture_number;
373 int context_initialized;
381 int chroma_pred_mode;
382 int intra16x16_pred_mode;
387 int left_mb_xy[LEFT_MBS];
392 int left_type[LEFT_MBS];
394 const uint8_t *left_block;
395 int topleft_partition;
397 int8_t intra4x4_pred_mode_cache[5 * 8];
398 int8_t(*intra4x4_pred_mode);
400 unsigned int topleft_samples_available;
401 unsigned int top_samples_available;
402 unsigned int topright_samples_available;
403 unsigned int left_samples_available;
404 uint8_t (*top_borders[2])[(16 * 3) * 2];
407 * non zero coeff count cache.
408 * is 64 if not available.
410 DECLARE_ALIGNED(8, uint8_t, non_zero_count_cache)[15 * 8];
412 uint8_t (*non_zero_count)[48];
415 * Motion vector cache.
417 DECLARE_ALIGNED(16, int16_t, mv_cache)[2][5 * 8][2];
418 DECLARE_ALIGNED(8, int8_t, ref_cache)[2][5 * 8];
419 #define LIST_NOT_USED -1 // FIXME rename?
420 #define PART_NOT_AVAILABLE -2
423 * number of neighbors (top and/or left) that used 8x8 dct
425 int neighbor_transform_size;
428 * block_offset[ 0..23] for frame macroblocks
429 * block_offset[24..47] for field macroblocks
431 int block_offset[2 * (16 * 3)];
433 uint32_t *mb2b_xy; // FIXME are these 4 a good idea?
435 int b_stride; // FIXME use s->b4_stride
437 ptrdiff_t mb_linesize; ///< may be equal to s->linesize or s->linesize * 2, for mbaff
438 ptrdiff_t mb_uvlinesize;
440 unsigned current_sps_id; ///< id of the current SPS
441 SPS sps; ///< current sps
442 PPS pps; ///< current pps
444 int au_pps_id; ///< pps_id of current access unit
446 uint32_t dequant4_buffer[6][QP_MAX_NUM + 1][16]; // FIXME should these be moved down?
447 uint32_t dequant8_buffer[6][QP_MAX_NUM + 1][64];
448 uint32_t(*dequant4_coeff[6])[16];
449 uint32_t(*dequant8_coeff[6])[64];
452 uint16_t *slice_table; ///< slice_table_base + 2*mb_stride + 1
454 int slice_type_nos; ///< S free slice type (SI/SP are remapped to I/P)
455 int slice_type_fixed;
457 // interlacing specific flags
459 int mb_field_decoding_flag;
460 int mb_mbaff; ///< mb_aff_frame && mb_field_decoding_flag
461 int picture_structure;
464 DECLARE_ALIGNED(8, uint16_t, sub_mb_type)[4];
466 // Weighted pred stuff
468 int use_weight_chroma;
469 int luma_log2_weight_denom;
470 int chroma_log2_weight_denom;
471 // The following 2 can be changed to int8_t but that causes 10cpu cycles speedloss
472 int luma_weight[48][2][2];
473 int chroma_weight[48][2][2][2];
474 int implicit_weight[48][48][2];
476 int direct_spatial_mv_pred;
479 int dist_scale_factor[32];
480 int dist_scale_factor_field[2][32];
481 int map_col_to_list0[2][16 + 32];
482 int map_col_to_list0_field[2][2][16 + 32];
485 * num_ref_idx_l0/1_active_minus1 + 1
487 unsigned int ref_count[2]; ///< counts frames or fields, depending on current mb mode
488 unsigned int list_count;
489 uint8_t *list_counts; ///< Array of list_count per MB specifying the slice type
490 H264Picture ref_list[2][48]; /**< 0..15: frame refs, 16..47: mbaff field refs.
491 * Reordered version of default_ref_list
492 * according to picture reordering in slice header */
493 int ref2frm[MAX_SLICES][2][64]; ///< reference to frame number lists, used in the loop filter, the first 2 are for -2,-1
496 GetBitContext intra_gb;
497 GetBitContext inter_gb;
498 GetBitContext *intra_gb_ptr;
499 GetBitContext *inter_gb_ptr;
501 const uint8_t *intra_pcm_ptr;
502 DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2]; ///< as a dct coefficient is int32_t in high depth, we need to reserve twice the space.
503 DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
504 int16_t mb_padding[256 * 2]; ///< 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
510 uint8_t cabac_state[1024];
512 /* 0x100 -> non null luma_dc, 0x80/0x40 -> non null chroma_dc (cb/cr), 0x?0 -> chroma_cbp(0, 1, 2), 0x0? luma_cbp */
517 /* chroma_pred_mode for i4x4 or i16x16, else 0 */
518 uint8_t *chroma_pred_mode_table;
519 int last_qscale_diff;
520 uint8_t (*mvd_table[2])[2];
521 DECLARE_ALIGNED(16, uint8_t, mvd_cache)[2][5 * 8][2];
522 uint8_t *direct_table;
523 uint8_t direct_cache[5 * 8];
525 uint8_t zigzag_scan[16];
526 uint8_t zigzag_scan8x8[64];
527 uint8_t zigzag_scan8x8_cavlc[64];
528 uint8_t field_scan[16];
529 uint8_t field_scan8x8[64];
530 uint8_t field_scan8x8_cavlc[64];
531 uint8_t zigzag_scan_q0[16];
532 uint8_t zigzag_scan8x8_q0[64];
533 uint8_t zigzag_scan8x8_cavlc_q0[64];
534 uint8_t field_scan_q0[16];
535 uint8_t field_scan8x8_q0[64];
536 uint8_t field_scan8x8_cavlc_q0[64];
544 int mb_height, mb_width;
552 int deblocking_filter; ///< disable_deblocking_filter_idc with 1 <-> 0
553 int slice_alpha_c0_offset;
554 int slice_beta_offset;
556 // =============================================================
557 // Things below are not used in the MB or more inner code
561 uint8_t *rbsp_buffer[2];
562 unsigned int rbsp_buffer_size[2];
565 * Used to parse AVC variant of h264
567 int is_avc; ///< this flag is != 0 if codec is avc1
568 int nal_length_size; ///< Number of bytes used for nal length (1, 2 or 4)
569 int got_first; ///< this flag is != 0 if we've parsed a frame
571 int bit_depth_luma; ///< luma bit depth from sps to detect changes
572 int chroma_format_idc; ///< chroma format from sps to detect changes
574 SPS *sps_buffers[MAX_SPS_COUNT];
575 PPS *pps_buffers[MAX_PPS_COUNT];
577 int dequant_coeff_pps; ///< reinit tables when pps changes
579 uint16_t *slice_table_base;
584 int delta_poc_bottom;
587 int prev_poc_msb; ///< poc_msb of the last reference pic for POC type 0
588 int prev_poc_lsb; ///< poc_lsb of the last reference pic for POC type 0
589 int frame_num_offset; ///< for POC type 2
590 int prev_frame_num_offset; ///< for POC type 2
591 int prev_frame_num; ///< frame_num of the last pic for POC type 1/2
594 * frame_num for frames or 2 * frame_num + 1 for field pics.
599 * max_frame_num or 2 * max_frame_num for field pics.
603 int redundant_pic_count;
605 H264Picture default_ref_list[2][32]; ///< base reference list for all slices of a coded picture
606 H264Picture *short_ref[32];
607 H264Picture *long_ref[32];
608 H264Picture *delayed_pic[MAX_DELAYED_PIC_COUNT + 2]; // FIXME size?
609 int last_pocs[MAX_DELAYED_PIC_COUNT];
610 H264Picture *next_output_pic;
612 int next_outputed_poc;
615 * memory management control operations buffer.
617 MMCO mmco[MAX_MMCO_COUNT];
621 int long_ref_count; ///< number of actual long term references
622 int short_ref_count; ///< number of actual short term references
627 * @name Members for slice based multithreading
630 struct H264Context *thread_context[H264_MAX_THREADS];
633 * current slice number, used to initialize slice_num of each thread/context
638 * Max number of threads / contexts.
639 * This is equal to AVCodecContext.thread_count unless
640 * multithreaded decoding is impossible, in which case it is
645 int slice_context_count;
648 * 1 if the single thread fallback warning has already been
649 * displayed, 0 otherwise.
651 int single_decode_warning;
653 enum AVPictureType pict_type;
656 unsigned int last_ref_count[2];
660 * pic_struct in picture timing SEI message
662 SEI_PicStructType sei_pic_struct;
665 * Complement sei_pic_struct
666 * SEI_PIC_STRUCT_TOP_BOTTOM and SEI_PIC_STRUCT_BOTTOM_TOP indicate interlaced frames.
667 * However, soft telecined frames may have these values.
668 * This is used in an attempt to flag soft telecine progressive.
670 int prev_interlaced_frame;
673 * frame_packing_arrangment SEI message
675 int sei_frame_packing_present;
676 int frame_packing_arrangement_type;
677 int content_interpretation_type;
678 int quincunx_subsampling;
681 * display orientation SEI message
683 int sei_display_orientation_present;
684 int sei_anticlockwise_rotation;
685 int sei_hflip, sei_vflip;
688 * Bit set of clock types for fields/frames in picture timing SEI message.
689 * For each found ct_type, appropriate bit is set (e.g., bit 1 for
695 * dpb_output_delay in picture timing SEI message, see H.264 C.2.2
697 int sei_dpb_output_delay;
700 * cpb_removal_delay in picture timing SEI message, see H.264 C.1.2
702 int sei_cpb_removal_delay;
705 * recovery_frame_cnt from SEI message
707 * Set to -1 if no recovery point SEI message found or to number of frames
708 * before playback synchronizes. Frames having recovery point are key
711 int sei_recovery_frame_cnt;
714 * Are the SEI recovery points looking valid.
716 int valid_recovery_point;
721 * recovery_frame is the frame_num at which the next frame should
722 * be fully constructed.
724 * Set to -1 when not expecting a recovery point.
729 * We have seen an IDR, so all the following frames in coded order are correctly
732 #define FRAME_RECOVERED_IDR (1 << 0)
734 * Sufficient number of frames have been decoded since a SEI recovery point,
735 * so all the following frames in presentation order are correct.
737 #define FRAME_RECOVERED_SEI (1 << 1)
739 int frame_recovered; ///< Initial frame has been completely recovered
741 int has_recovery_point;
743 int luma_weight_flag[2]; ///< 7.4.3.2 luma_weight_lX_flag
744 int chroma_weight_flag[2]; ///< 7.4.3.2 chroma_weight_lX_flag
747 int sei_buffering_period_present; ///< Buffering period SEI flag
748 int initial_cpb_removal_delay[32]; ///< Initial timestamps for CPBs
750 int cur_chroma_format_idc;
751 uint8_t *bipred_scratchpad;
753 int16_t slice_row[MAX_SLICES]; ///< to detect when MAX_SLICES is too low
755 uint8_t parse_history[6];
756 int parse_history_count;
758 uint8_t *edge_emu_buffer;
759 int16_t *dc_val_base;
761 AVBufferPool *qscale_table_pool;
762 AVBufferPool *mb_type_pool;
763 AVBufferPool *motion_val_pool;
764 AVBufferPool *ref_index_pool;
766 /* Motion Estimation */
767 qpel_mc_func (*qpel_put)[16];
768 qpel_mc_func (*qpel_avg)[16];
771 extern const uint8_t ff_h264_chroma_qp[7][QP_MAX_NUM + 1]; ///< One chroma qp table for each possible bit depth (8-14).
772 extern const uint16_t ff_h264_mb_sizes[4];
777 int ff_h264_decode_sei(H264Context *h);
782 int ff_h264_decode_seq_parameter_set(H264Context *h);
785 * compute profile from sps
787 int ff_h264_get_profile(SPS *sps);
792 int ff_h264_decode_picture_parameter_set(H264Context *h, int bit_length);
795 * Decode a network abstraction layer unit.
796 * @param consumed is the number of bytes used as input
797 * @param length is the length of the array
798 * @param dst_length is the number of decoded bytes FIXME here
799 * or a decode rbsp tailing?
800 * @return decoded bytes, might be src+1 if no escapes
802 const uint8_t *ff_h264_decode_nal(H264Context *h, const uint8_t *src,
803 int *dst_length, int *consumed, int length);
806 * Free any data that may have been allocated in the H264 context
809 void ff_h264_free_context(H264Context *h);
812 * Reconstruct bitstream slice_type.
814 int ff_h264_get_slice_type(const H264Context *h);
820 int ff_h264_alloc_tables(H264Context *h);
823 * Fill the default_ref_list.
825 int ff_h264_fill_default_ref_list(H264Context *h);
827 int ff_h264_decode_ref_pic_list_reordering(H264Context *h);
828 void ff_h264_fill_mbaff_ref_list(H264Context *h);
829 void ff_h264_remove_all_refs(H264Context *h);
832 * Execute the reference picture marking (memory management control operations).
834 int ff_h264_execute_ref_pic_marking(H264Context *h, MMCO *mmco, int mmco_count);
836 int ff_h264_decode_ref_pic_marking(H264Context *h, GetBitContext *gb,
839 int ff_generate_sliding_window_mmcos(H264Context *h, int first_slice);
842 * Check if the top & left blocks are available if needed & change the
843 * dc mode so it only uses the available blocks.
845 int ff_h264_check_intra4x4_pred_mode(H264Context *h);
848 * Check if the top & left blocks are available if needed & change the
849 * dc mode so it only uses the available blocks.
851 int ff_h264_check_intra_pred_mode(H264Context *h, int mode, int is_chroma);
853 void ff_h264_hl_decode_mb(H264Context *h);
854 int ff_h264_decode_extradata(H264Context *h, const uint8_t *buf, int size);
855 int ff_h264_decode_init(AVCodecContext *avctx);
856 void ff_h264_decode_init_vlc(void);
859 * Decode a macroblock
860 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
862 int ff_h264_decode_mb_cavlc(H264Context *h);
865 * Decode a CABAC coded macroblock
866 * @return 0 if OK, ER_AC_ERROR / ER_DC_ERROR / ER_MV_ERROR on error
868 int ff_h264_decode_mb_cabac(H264Context *h);
870 void ff_h264_init_cabac_states(H264Context *h);
872 void h264_init_dequant_tables(H264Context *h);
874 void ff_h264_direct_dist_scale_factor(H264Context *const h);
875 void ff_h264_direct_ref_list_init(H264Context *const h);
876 void ff_h264_pred_direct_motion(H264Context *const h, int *mb_type);
878 void ff_h264_filter_mb_fast(H264Context *h, int mb_x, int mb_y,
879 uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
880 unsigned int linesize, unsigned int uvlinesize);
881 void ff_h264_filter_mb(H264Context *h, int mb_x, int mb_y,
882 uint8_t *img_y, uint8_t *img_cb, uint8_t *img_cr,
883 unsigned int linesize, unsigned int uvlinesize);
886 * Reset SEI values at the beginning of the frame.
888 * @param h H.264 context.
890 void ff_h264_reset_sei(H264Context *h);
893 * Get stereo_mode string from the h264 frame_packing_arrangement
894 * @param h H.264 context.
896 const char* ff_h264_sei_stereo_mode(H264Context *h);
908 /* Scan8 organization:
925 * DY/DU/DV are for luma/chroma DC.
928 #define LUMA_DC_BLOCK_INDEX 48
929 #define CHROMA_DC_BLOCK_INDEX 49
931 // This table must be here because scan8[constant] must be known at compiletime
932 static const uint8_t scan8[16 * 3 + 3] = {
933 4 + 1 * 8, 5 + 1 * 8, 4 + 2 * 8, 5 + 2 * 8,
934 6 + 1 * 8, 7 + 1 * 8, 6 + 2 * 8, 7 + 2 * 8,
935 4 + 3 * 8, 5 + 3 * 8, 4 + 4 * 8, 5 + 4 * 8,
936 6 + 3 * 8, 7 + 3 * 8, 6 + 4 * 8, 7 + 4 * 8,
937 4 + 6 * 8, 5 + 6 * 8, 4 + 7 * 8, 5 + 7 * 8,
938 6 + 6 * 8, 7 + 6 * 8, 6 + 7 * 8, 7 + 7 * 8,
939 4 + 8 * 8, 5 + 8 * 8, 4 + 9 * 8, 5 + 9 * 8,
940 6 + 8 * 8, 7 + 8 * 8, 6 + 9 * 8, 7 + 9 * 8,
941 4 + 11 * 8, 5 + 11 * 8, 4 + 12 * 8, 5 + 12 * 8,
942 6 + 11 * 8, 7 + 11 * 8, 6 + 12 * 8, 7 + 12 * 8,
943 4 + 13 * 8, 5 + 13 * 8, 4 + 14 * 8, 5 + 14 * 8,
944 6 + 13 * 8, 7 + 13 * 8, 6 + 14 * 8, 7 + 14 * 8,
945 0 + 0 * 8, 0 + 5 * 8, 0 + 10 * 8
948 static av_always_inline uint32_t pack16to32(int a, int b)
951 return (b & 0xFFFF) + (a << 16);
953 return (a & 0xFFFF) + (b << 16);
957 static av_always_inline uint16_t pack8to16(int a, int b)
960 return (b & 0xFF) + (a << 8);
962 return (a & 0xFF) + (b << 8);
969 static av_always_inline int get_chroma_qp(H264Context *h, int t, int qscale)
971 return h->pps.chroma_qp_table[t][qscale];
975 * Get the predicted intra4x4 prediction mode.
977 static av_always_inline int pred_intra_mode(H264Context *h, int n)
979 const int index8 = scan8[n];
980 const int left = h->intra4x4_pred_mode_cache[index8 - 1];
981 const int top = h->intra4x4_pred_mode_cache[index8 - 8];
982 const int min = FFMIN(left, top);
984 tprintf(h->avctx, "mode:%d %d min:%d\n", left, top, min);
992 static av_always_inline void write_back_intra_pred_mode(H264Context *h)
994 int8_t *i4x4 = h->intra4x4_pred_mode + h->mb2br_xy[h->mb_xy];
995 int8_t *i4x4_cache = h->intra4x4_pred_mode_cache;
997 AV_COPY32(i4x4, i4x4_cache + 4 + 8 * 4);
998 i4x4[4] = i4x4_cache[7 + 8 * 3];
999 i4x4[5] = i4x4_cache[7 + 8 * 2];
1000 i4x4[6] = i4x4_cache[7 + 8 * 1];
1003 static av_always_inline void write_back_non_zero_count(H264Context *h)
1005 const int mb_xy = h->mb_xy;
1006 uint8_t *nnz = h->non_zero_count[mb_xy];
1007 uint8_t *nnz_cache = h->non_zero_count_cache;
1009 AV_COPY32(&nnz[ 0], &nnz_cache[4 + 8 * 1]);
1010 AV_COPY32(&nnz[ 4], &nnz_cache[4 + 8 * 2]);
1011 AV_COPY32(&nnz[ 8], &nnz_cache[4 + 8 * 3]);
1012 AV_COPY32(&nnz[12], &nnz_cache[4 + 8 * 4]);
1013 AV_COPY32(&nnz[16], &nnz_cache[4 + 8 * 6]);
1014 AV_COPY32(&nnz[20], &nnz_cache[4 + 8 * 7]);
1015 AV_COPY32(&nnz[32], &nnz_cache[4 + 8 * 11]);
1016 AV_COPY32(&nnz[36], &nnz_cache[4 + 8 * 12]);
1018 if (!h->chroma_y_shift) {
1019 AV_COPY32(&nnz[24], &nnz_cache[4 + 8 * 8]);
1020 AV_COPY32(&nnz[28], &nnz_cache[4 + 8 * 9]);
1021 AV_COPY32(&nnz[40], &nnz_cache[4 + 8 * 13]);
1022 AV_COPY32(&nnz[44], &nnz_cache[4 + 8 * 14]);
1026 static av_always_inline void write_back_motion_list(H264Context *h,
1028 int b_xy, int b8_xy,
1029 int mb_type, int list)
1031 int16_t(*mv_dst)[2] = &h->cur_pic.motion_val[list][b_xy];
1032 int16_t(*mv_src)[2] = &h->mv_cache[list][scan8[0]];
1033 AV_COPY128(mv_dst + 0 * b_stride, mv_src + 8 * 0);
1034 AV_COPY128(mv_dst + 1 * b_stride, mv_src + 8 * 1);
1035 AV_COPY128(mv_dst + 2 * b_stride, mv_src + 8 * 2);
1036 AV_COPY128(mv_dst + 3 * b_stride, mv_src + 8 * 3);
1038 uint8_t (*mvd_dst)[2] = &h->mvd_table[list][FMO ? 8 * h->mb_xy
1039 : h->mb2br_xy[h->mb_xy]];
1040 uint8_t(*mvd_src)[2] = &h->mvd_cache[list][scan8[0]];
1041 if (IS_SKIP(mb_type)) {
1042 AV_ZERO128(mvd_dst);
1044 AV_COPY64(mvd_dst, mvd_src + 8 * 3);
1045 AV_COPY16(mvd_dst + 3 + 3, mvd_src + 3 + 8 * 0);
1046 AV_COPY16(mvd_dst + 3 + 2, mvd_src + 3 + 8 * 1);
1047 AV_COPY16(mvd_dst + 3 + 1, mvd_src + 3 + 8 * 2);
1052 int8_t *ref_index = &h->cur_pic.ref_index[list][b8_xy];
1053 int8_t *ref_cache = h->ref_cache[list];
1054 ref_index[0 + 0 * 2] = ref_cache[scan8[0]];
1055 ref_index[1 + 0 * 2] = ref_cache[scan8[4]];
1056 ref_index[0 + 1 * 2] = ref_cache[scan8[8]];
1057 ref_index[1 + 1 * 2] = ref_cache[scan8[12]];
1061 static av_always_inline void write_back_motion(H264Context *h, int mb_type)
1063 const int b_stride = h->b_stride;
1064 const int b_xy = 4 * h->mb_x + 4 * h->mb_y * h->b_stride; // try mb2b(8)_xy
1065 const int b8_xy = 4 * h->mb_xy;
1067 if (USES_LIST(mb_type, 0)) {
1068 write_back_motion_list(h, b_stride, b_xy, b8_xy, mb_type, 0);
1070 fill_rectangle(&h->cur_pic.ref_index[0][b8_xy],
1071 2, 2, 2, (uint8_t)LIST_NOT_USED, 1);
1073 if (USES_LIST(mb_type, 1))
1074 write_back_motion_list(h, b_stride, b_xy, b8_xy, mb_type, 1);
1076 if (h->slice_type_nos == AV_PICTURE_TYPE_B && CABAC(h)) {
1077 if (IS_8X8(mb_type)) {
1078 uint8_t *direct_table = &h->direct_table[4 * h->mb_xy];
1079 direct_table[1] = h->sub_mb_type[1] >> 1;
1080 direct_table[2] = h->sub_mb_type[2] >> 1;
1081 direct_table[3] = h->sub_mb_type[3] >> 1;
1086 static av_always_inline int get_dct8x8_allowed(H264Context *h)
1088 if (h->sps.direct_8x8_inference_flag)
1089 return !(AV_RN64A(h->sub_mb_type) &
1090 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8) *
1091 0x0001000100010001ULL));
1093 return !(AV_RN64A(h->sub_mb_type) &
1094 ((MB_TYPE_16x8 | MB_TYPE_8x16 | MB_TYPE_8x8 | MB_TYPE_DIRECT2) *
1095 0x0001000100010001ULL));
1098 static inline int find_start_code(const uint8_t *buf, int buf_size,
1099 int buf_index, int next_avc)
1101 uint32_t state = -1;
1103 buf_index = avpriv_find_start_code(buf + buf_index, buf + next_avc + 1, &state) - buf - 1;
1105 return FFMIN(buf_index, buf_size);
1108 static inline int get_avc_nalsize(H264Context *h, const uint8_t *buf,
1109 int buf_size, int *buf_index)
1113 if (*buf_index >= buf_size - h->nal_length_size)
1116 for (i = 0; i < h->nal_length_size; i++)
1117 nalsize = ((unsigned)nalsize << 8) | buf[(*buf_index)++];
1118 if (nalsize <= 0 || nalsize > buf_size - *buf_index) {
1119 av_log(h->avctx, AV_LOG_ERROR,
1120 "AVC: nal size %d\n", nalsize);
1126 int ff_h264_field_end(H264Context *h, int in_setup);
1128 int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src);
1129 void ff_h264_unref_picture(H264Context *h, H264Picture *pic);
1131 int ff_h264_context_init(H264Context *h);
1132 int ff_h264_set_parameter_from_sps(H264Context *h);
1134 void ff_h264_draw_horiz_band(H264Context *h, int y, int height);
1135 int ff_init_poc(H264Context *h, int pic_field_poc[2], int *pic_poc);
1136 int ff_pred_weight_table(H264Context *h);
1137 int ff_set_ref_count(H264Context *h);
1139 int ff_h264_decode_slice_header(H264Context *h, H264Context *h0);
1140 #define SLICE_SINGLETHREAD 1
1141 #define SLICE_SKIPED 2
1143 int ff_h264_execute_decode_slices(H264Context *h, unsigned context_count);
1144 int ff_h264_update_thread_context(AVCodecContext *dst,
1145 const AVCodecContext *src);
1147 void ff_h264_flush_change(H264Context *h);
1149 void ff_h264_free_tables(H264Context *h, int free_rbsp);
1151 void ff_h264_set_erpic(ERPicture *dst, H264Picture *src);
1153 #endif /* AVCODEC_H264_H */