AOMedia AV1 Codec: av1/encoder/bitstream.h Source File

| AOMedia AV1 Codec

bitstream.h
1/*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12#ifndef AOM_AV1_ENCODER_BITSTREAM_H_
13#define AOM_AV1_ENCODER_BITSTREAM_H_
14
15#ifdef __cplusplus
16extern "C" {
17#endif
18
19#include "av1/common/av1_common_int.h"
20#include "av1/common/blockd.h"
21#include "av1/common/enums.h"
22#include "av1/encoder/level.h"
23#include "aom_dsp/bitwriter.h"
24
25struct aom_write_bit_buffer;
26struct AV1_COMP;
27struct ThreadData;
28
31// Stores the location and size of a tile's data in the bitstream. Used for
32// later identifying identical tiles
33typedef struct {
34 uint8_t *data;
35 size_t size;
36} TileBufferEnc;
37
38typedef struct {
39 uint8_t *frame_header;
40 size_t obu_header_byte_offset;
41 size_t total_length;
42} FrameHeaderInfo;
43
44typedef struct {
45 struct aom_write_bit_buffer *saved_wb; // Bit stream buffer writer structure
46 TileBufferEnc buf; // Structure to hold bitstream buffer and size
47 uint32_t *total_size; // Size of the bitstream buffer for the tile in bytes
48 uint8_t *dst; // Base address of tile bitstream buffer
49 uint8_t *tile_data_curr; // Base address of tile-group bitstream buffer
50 size_t tile_buf_size; // Available bitstream buffer for the tile in bytes
51 uint8_t obu_extn_header; // Presence of OBU extension header
52 uint32_t obu_header_size; // Size of the OBU header
53 int curr_tg_hdr_size; // Size of the obu, tg, frame headers
54 int tile_size_mi; // Tile size in mi units
55 int tile_row; // Number of tile rows
56 int tile_col; // Number of tile columns
57 int is_last_tile_in_tg; // Flag to indicate last tile in a tile-group
58 int new_tg; // Flag to indicate starting of a new tile-group
59} PackBSParams;
60
61typedef struct {
62 uint64_t abs_sum_level;
63 uint16_t tile_idx;
64} PackBSTileOrder;
65
66// Pack bitstream data for pack bitstream multi-threading.
67typedef struct {
68#if CONFIG_MULTITHREAD
69 // Mutex lock used while dispatching jobs.
70 pthread_mutex_t *mutex_;
71#endif
72 // Tile order structure of pack bitstream multithreading.
73 PackBSTileOrder pack_bs_tile_order[MAX_TILES];
74
75 // Index of next job to be processed.
76 int next_job_idx;
77} AV1EncPackBSSync;
78
81// Writes only the OBU Sequence Header payload, and returns the size of the
82// payload written to 'dst'. This function does not write the OBU header, the
83// optional extension, or the OBU size to 'dst'.
84uint32_t av1_write_sequence_header_obu(const SequenceHeader *seq_params,
85 uint8_t *const dst);
86
87// Writes the OBU header byte, and the OBU header extension byte when
88// 'obu_extension' is non-zero. Returns number of bytes written to 'dst'.
89uint32_t av1_write_obu_header(AV1LevelParams *const level_params,
90 int *frame_header_count, OBU_TYPE obu_type,
91 int obu_extension, uint8_t *const dst);
92
93int av1_write_uleb_obu_size(size_t obu_header_size, size_t obu_payload_size,
94 uint8_t *dest);
95
96// Pack tile data in the bitstream with tile_group, frame
97// and OBU header.
98void av1_pack_tile_info(struct AV1_COMP *const cpi, struct ThreadData *const td,
99 PackBSParams *const pack_bs_params);
100
101void av1_write_last_tile_info(
102 struct AV1_COMP *const cpi, const FrameHeaderInfo *fh_info,
103 struct aom_write_bit_buffer *saved_wb, size_t *curr_tg_data_size,
104 uint8_t *curr_tg_start, uint32_t *const total_size,
105 uint8_t **tile_data_start, int *const largest_tile_id,
106 int *const is_first_tg, uint32_t obu_header_size, uint8_t obu_extn_header);
107
113 int av1_pack_bitstream(struct AV1_COMP *const cpi, uint8_t *dst, size_t *size,
114 int *const largest_tile_id);
115
116void av1_write_tx_type(const AV1_COMMON *const cm, const MACROBLOCKD *xd,
117 TX_TYPE tx_type, TX_SIZE tx_size, aom_writer *w);
118
119void av1_reset_pack_bs_thread_data(struct ThreadData *const td);
120
121void av1_accumulate_pack_bs_thread_data(struct AV1_COMP *const cpi,
122 struct ThreadData const *td);
123
124void av1_write_obu_tg_tile_headers(struct AV1_COMP *const cpi,
125 MACROBLOCKD *const xd,
126 PackBSParams *const pack_bs_params,
127 const int tile_idx);
128
129int av1_neg_interleave(int x, int ref, int max);
130#ifdef __cplusplus
131} // extern "C"
132#endif
133
134#endif // AOM_AV1_ENCODER_BITSTREAM_H_
enums.h
OBU_TYPE
OBU_TYPE
OBU types.
Definition: aom_codec.h:542
av1_pack_bitstream
int av1_pack_bitstream(struct AV1_COMP *const cpi, uint8_t *dst, size_t *size, int *const largest_tile_id)
Pack the bitstream for one frame.
AV1Common
Top level common structure used by both encoder and decoder.
Definition: av1_common_int.h:750
AV1_COMP
Top level encoder structure.
Definition: encoder.h:2759
macroblockd
Variables related to current coding block.
Definition: blockd.h:574