xref: /aosp_15_r20/external/webrtc/api/video_codecs/bitstream_parser.h (revision d9f758449e529ab9291ac668be2861e7a55c2422)
1*d9f75844SAndroid Build Coastguard Worker /*
2*d9f75844SAndroid Build Coastguard Worker  *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
3*d9f75844SAndroid Build Coastguard Worker  *
4*d9f75844SAndroid Build Coastguard Worker  *  Use of this source code is governed by a BSD-style license
5*d9f75844SAndroid Build Coastguard Worker  *  that can be found in the LICENSE file in the root of the source
6*d9f75844SAndroid Build Coastguard Worker  *  tree. An additional intellectual property rights grant can be found
7*d9f75844SAndroid Build Coastguard Worker  *  in the file PATENTS.  All contributing project authors may
8*d9f75844SAndroid Build Coastguard Worker  *  be found in the AUTHORS file in the root of the source tree.
9*d9f75844SAndroid Build Coastguard Worker  */
10*d9f75844SAndroid Build Coastguard Worker 
11*d9f75844SAndroid Build Coastguard Worker #ifndef API_VIDEO_CODECS_BITSTREAM_PARSER_H_
12*d9f75844SAndroid Build Coastguard Worker #define API_VIDEO_CODECS_BITSTREAM_PARSER_H_
13*d9f75844SAndroid Build Coastguard Worker 
14*d9f75844SAndroid Build Coastguard Worker #include <stddef.h>
15*d9f75844SAndroid Build Coastguard Worker #include <stdint.h>
16*d9f75844SAndroid Build Coastguard Worker 
17*d9f75844SAndroid Build Coastguard Worker #include "absl/types/optional.h"
18*d9f75844SAndroid Build Coastguard Worker #include "api/array_view.h"
19*d9f75844SAndroid Build Coastguard Worker 
20*d9f75844SAndroid Build Coastguard Worker namespace webrtc {
21*d9f75844SAndroid Build Coastguard Worker 
22*d9f75844SAndroid Build Coastguard Worker // This class is an interface for bitstream parsers.
23*d9f75844SAndroid Build Coastguard Worker class BitstreamParser {
24*d9f75844SAndroid Build Coastguard Worker  public:
25*d9f75844SAndroid Build Coastguard Worker   virtual ~BitstreamParser() = default;
26*d9f75844SAndroid Build Coastguard Worker 
27*d9f75844SAndroid Build Coastguard Worker   // Parse an additional chunk of the bitstream.
28*d9f75844SAndroid Build Coastguard Worker   virtual void ParseBitstream(rtc::ArrayView<const uint8_t> bitstream) = 0;
29*d9f75844SAndroid Build Coastguard Worker 
30*d9f75844SAndroid Build Coastguard Worker   // Get the last extracted QP value from the parsed bitstream. If no QP
31*d9f75844SAndroid Build Coastguard Worker   // value could be parsed, returns absl::nullopt.
32*d9f75844SAndroid Build Coastguard Worker   virtual absl::optional<int> GetLastSliceQp() const = 0;
33*d9f75844SAndroid Build Coastguard Worker };
34*d9f75844SAndroid Build Coastguard Worker 
35*d9f75844SAndroid Build Coastguard Worker }  // namespace webrtc
36*d9f75844SAndroid Build Coastguard Worker 
37*d9f75844SAndroid Build Coastguard Worker #endif  // API_VIDEO_CODECS_BITSTREAM_PARSER_H_
38