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
16 extern "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 
25 struct aom_write_bit_buffer;
26 struct AV1_COMP;
27 struct ThreadData;
28 
31 // Stores the location and size of a tile's data in the bitstream. Used for
32 // later identifying identical tiles
33 typedef struct {
34  uint8_t *data;
35  size_t size;
36 } TileBufferEnc;
37 
38 typedef struct {
39  uint8_t *frame_header;
40  size_t obu_header_byte_offset;
41  size_t total_length;
42 } FrameHeaderInfo;
43 
44 typedef 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 
61 typedef struct {
62  uint64_t abs_sum_level;
63  uint16_t tile_idx;
64 } PackBSTileOrder;
65 
66 // Pack bitstream data for pack bitstream multi-threading.
67 typedef 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  // Initialized to false, set to true by the worker thread that encounters an
78  // error in order to abort the processing of other worker threads.
79  bool pack_bs_mt_exit;
80 } AV1EncPackBSSync;
81 
84 // Writes only the OBU Sequence Header payload, and returns the size of the
85 // payload written to 'dst'. This function does not write the OBU header, the
86 // optional extension, or the OBU size to 'dst'.
87 uint32_t av1_write_sequence_header_obu(const SequenceHeader *seq_params,
88  uint8_t *const dst);
89 
90 // Writes the OBU header byte, and the OBU header extension byte when
91 // 'obu_extension' is non-zero. Returns number of bytes written to 'dst'.
92 uint32_t av1_write_obu_header(AV1LevelParams *const level_params,
93  int *frame_header_count, OBU_TYPE obu_type,
94  int obu_extension, uint8_t *const dst);
95 
96 int av1_write_uleb_obu_size(size_t obu_header_size, size_t obu_payload_size,
97  uint8_t *dest);
98 
99 // Pack tile data in the bitstream with tile_group, frame
100 // and OBU header.
101 void av1_pack_tile_info(struct AV1_COMP *const cpi, struct ThreadData *const td,
102  PackBSParams *const pack_bs_params);
103 
104 void av1_write_last_tile_info(
105  struct AV1_COMP *const cpi, const FrameHeaderInfo *fh_info,
106  struct aom_write_bit_buffer *saved_wb, size_t *curr_tg_data_size,
107  uint8_t *curr_tg_start, uint32_t *const total_size,
108  uint8_t **tile_data_start, int *const largest_tile_id,
109  int *const is_first_tg, uint32_t obu_header_size, uint8_t obu_extn_header);
110 
116 int av1_pack_bitstream(struct AV1_COMP *const cpi, uint8_t *dst, size_t *size,
117  int *const largest_tile_id);
118 
119 void av1_write_tx_type(const AV1_COMMON *const cm, const MACROBLOCKD *xd,
120  TX_TYPE tx_type, TX_SIZE tx_size, aom_writer *w);
121 
122 void av1_reset_pack_bs_thread_data(struct ThreadData *const td);
123 
124 void av1_accumulate_pack_bs_thread_data(struct AV1_COMP *const cpi,
125  struct ThreadData const *td);
126 
127 void av1_write_obu_tg_tile_headers(struct AV1_COMP *const cpi,
128  MACROBLOCKD *const xd,
129  PackBSParams *const pack_bs_params,
130  const int tile_idx);
131 
132 int av1_neg_interleave(int x, int ref, int max);
133 #ifdef __cplusplus
134 } // extern "C"
135 #endif
136 
137 #endif // AOM_AV1_ENCODER_BITSTREAM_H_
OBU_TYPE
OBU types.
Definition: aom_codec.h:546
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.
Top level common structure used by both encoder and decoder.
Definition: av1_common_int.h:752
Top level encoder structure.
Definition: encoder.h:2872
Variables related to current coding block.
Definition: blockd.h:570