1 /*
2  * Copyright (c) 2017, 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 #ifndef AOM_COMMON_OBUDEC_H_
12 #define AOM_COMMON_OBUDEC_H_
13 
14 #include "common/tools_common.h"
15 
16 #ifdef __cplusplus
17 extern "C" {
18 #endif
19 
20 struct ObuDecInputContext {
21   struct AvxInputContext *avx_ctx;
22   uint8_t *buffer;
23   size_t buffer_capacity;
24   size_t bytes_buffered;
25   int is_annexb;
26 };
27 
28 // Returns 1 when file data starts (if Annex B stream, after reading the
29 // size of the OBU) with what appears to be a Temporal Delimiter
30 // OBU as defined by Section 5 of the AV1 bitstream specification.
31 int file_is_obu(struct ObuDecInputContext *obu_ctx);
32 
33 // Reads one Temporal Unit from the input file. Returns 0 when a TU is
34 // successfully read, 1 when end of file is reached, and less than 0 when an
35 // error occurs. Stores TU data in 'buffer'. Reallocs buffer to match TU size,
36 // returns buffer capacity via 'buffer_size', and returns size of buffered data
37 // via 'bytes_read'.
38 int obudec_read_temporal_unit(struct ObuDecInputContext *obu_ctx,
39                               uint8_t **buffer, size_t *bytes_read,
40                               size_t *buffer_size);
41 
42 void obudec_free(struct ObuDecInputContext *obu_ctx);
43 
44 #ifdef __cplusplus
45 } /* extern "C" */
46 #endif
47 
48 #endif  // AOM_COMMON_OBUDEC_H_
49