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 MODULES_AUDIO_CODING_CODECS_ILBC_AUDIO_ENCODER_ILBC_H_
12 #define MODULES_AUDIO_CODING_CODECS_ILBC_AUDIO_ENCODER_ILBC_H_
13 
14 #include "api/audio_codecs/audio_encoder.h"
15 #include "api/audio_codecs/ilbc/audio_encoder_ilbc_config.h"
16 #include "modules/audio_coding/codecs/ilbc/ilbc.h"
17 #include "rtc_base/constructormagic.h"
18 
19 namespace webrtc {
20 
21 struct CodecInst;
22 
23 class AudioEncoderIlbcImpl final : public AudioEncoder {
24  public:
25   AudioEncoderIlbcImpl(const AudioEncoderIlbcConfig& config, int payload_type);
26   explicit AudioEncoderIlbcImpl(const CodecInst& codec_inst);
27   ~AudioEncoderIlbcImpl() override;
28 
29   int SampleRateHz() const override;
30   size_t NumChannels() const override;
31   size_t Num10MsFramesInNextPacket() const override;
32   size_t Max10MsFramesInAPacket() const override;
33   int GetTargetBitrate() const override;
34   EncodedInfo EncodeImpl(uint32_t rtp_timestamp,
35                          rtc::ArrayView<const int16_t> audio,
36                          rtc::Buffer* encoded) override;
37   void Reset() override;
38 
39  private:
40   size_t RequiredOutputSizeBytes() const;
41 
42   static constexpr size_t kMaxSamplesPerPacket = 480;
43   const int frame_size_ms_;
44   const int payload_type_;
45   const size_t num_10ms_frames_per_packet_;
46   size_t num_10ms_frames_buffered_;
47   uint32_t first_timestamp_in_buffer_;
48   int16_t input_buffer_[kMaxSamplesPerPacket];
49   IlbcEncoderInstance* encoder_;
50   RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderIlbcImpl);
51 };
52 
53 }  // namespace webrtc
54 #endif  // MODULES_AUDIO_CODING_CODECS_ILBC_AUDIO_ENCODER_ILBC_H_
55