1 /*
2  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_RED_AUDIO_ENCODER_COPY_RED_H_
12 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_RED_AUDIO_ENCODER_COPY_RED_H_
13 
14 #include <vector>
15 
16 #include "webrtc/base/buffer.h"
17 #include "webrtc/base/scoped_ptr.h"
18 #include "webrtc/modules/audio_coding/codecs/audio_encoder.h"
19 
20 namespace webrtc {
21 
22 // This class implements redundant audio coding. The class object will have an
23 // underlying AudioEncoder object that performs the actual encodings. The
24 // current class will gather the two latest encodings from the underlying codec
25 // into one packet.
26 class AudioEncoderCopyRed final : public AudioEncoder {
27  public:
28   struct Config {
29    public:
30     int payload_type;
31     AudioEncoder* speech_encoder;
32   };
33 
34   // Caller keeps ownership of the AudioEncoder object.
35   explicit AudioEncoderCopyRed(const Config& config);
36 
37   ~AudioEncoderCopyRed() override;
38 
39   size_t MaxEncodedBytes() const override;
40   int SampleRateHz() const override;
41   size_t NumChannels() const override;
42   int RtpTimestampRateHz() const override;
43   size_t Num10MsFramesInNextPacket() const override;
44   size_t Max10MsFramesInAPacket() const override;
45   int GetTargetBitrate() const override;
46   EncodedInfo EncodeInternal(uint32_t rtp_timestamp,
47                              rtc::ArrayView<const int16_t> audio,
48                              size_t max_encoded_bytes,
49                              uint8_t* encoded) override;
50   void Reset() override;
51   bool SetFec(bool enable) override;
52   bool SetDtx(bool enable) override;
53   bool SetApplication(Application application) override;
54   void SetMaxPlaybackRate(int frequency_hz) override;
55   void SetProjectedPacketLossRate(double fraction) override;
56   void SetTargetBitrate(int target_bps) override;
57 
58  private:
59   AudioEncoder* speech_encoder_;
60   int red_payload_type_;
61   rtc::Buffer secondary_encoded_;
62   EncodedInfoLeaf secondary_info_;
63   RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderCopyRed);
64 };
65 
66 }  // namespace webrtc
67 
68 #endif  // WEBRTC_MODULES_AUDIO_CODING_CODECS_RED_AUDIO_ENCODER_COPY_RED_H_
69