1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/*
* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_AUDIO_CODING_CODECS_G711_AUDIO_ENCODER_PCM_H_
#define MODULES_AUDIO_CODING_CODECS_G711_AUDIO_ENCODER_PCM_H_
#include <optional>
#include <utility>
#include <vector>
#include "api/audio_codecs/audio_encoder.h"
#include "api/units/time_delta.h"
namespace webrtc {
class AudioEncoderPcm : public AudioEncoder {
public:
struct Config {
public:
bool IsOk() const;
int frame_size_ms;
size_t num_channels;
int payload_type;
protected:
explicit Config(int pt)
: frame_size_ms(20), num_channels(1), payload_type(pt) {}
};
~AudioEncoderPcm() override;
int SampleRateHz() const override;
size_t NumChannels() const override;
size_t Num10MsFramesInNextPacket() const override;
size_t Max10MsFramesInAPacket() const override;
int GetTargetBitrate() const override;
void Reset() override;
std::optional<std::pair<TimeDelta, TimeDelta>> GetFrameLengthRange()
const override;
protected:
AudioEncoderPcm(const Config& config, int sample_rate_hz);
EncodedInfo EncodeImpl(uint32_t rtp_timestamp,
rtc::ArrayView<const int16_t> audio,
rtc::Buffer* encoded) override;
virtual size_t EncodeCall(const int16_t* audio,
size_t input_len,
uint8_t* encoded) = 0;
virtual size_t BytesPerSample() const = 0;
// Used to set EncodedInfoLeaf::encoder_type in
// AudioEncoderPcm::EncodeImpl
virtual AudioEncoder::CodecType GetCodecType() const = 0;
private:
const int sample_rate_hz_;
const size_t num_channels_;
const int payload_type_;
const size_t num_10ms_frames_per_packet_;
const size_t full_frame_samples_;
std::vector<int16_t> speech_buffer_;
uint32_t first_timestamp_in_buffer_;
};
class AudioEncoderPcmA final : public AudioEncoderPcm {
public:
struct Config : public AudioEncoderPcm::Config {
Config() : AudioEncoderPcm::Config(8) {}
};
explicit AudioEncoderPcmA(const Config& config)
: AudioEncoderPcm(config, kSampleRateHz) {}
AudioEncoderPcmA(const AudioEncoderPcmA&) = delete;
AudioEncoderPcmA& operator=(const AudioEncoderPcmA&) = delete;
protected:
size_t EncodeCall(const int16_t* audio,
size_t input_len,
uint8_t* encoded) override;
size_t BytesPerSample() const override;
AudioEncoder::CodecType GetCodecType() const override;
private:
static const int kSampleRateHz = 8000;
};
class AudioEncoderPcmU final : public AudioEncoderPcm {
public:
struct Config : public AudioEncoderPcm::Config {
Config() : AudioEncoderPcm::Config(0) {}
};
explicit AudioEncoderPcmU(const Config& config)
: AudioEncoderPcm(config, kSampleRateHz) {}
AudioEncoderPcmU(const AudioEncoderPcmU&) = delete;
AudioEncoderPcmU& operator=(const AudioEncoderPcmU&) = delete;
protected:
size_t EncodeCall(const int16_t* audio,
size_t input_len,
uint8_t* encoded) override;
size_t BytesPerSample() const override;
AudioEncoder::CodecType GetCodecType() const override;
private:
static const int kSampleRateHz = 8000;
};
} // namespace webrtc
#endif // MODULES_AUDIO_CODING_CODECS_G711_AUDIO_ENCODER_PCM_H_
|
