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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_G711_INCLUDE_AUDIO_ENCODER_PCM_H_ | |
12 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_G711_INCLUDE_AUDIO_ENCODER_PCM_H_ | |
13 | |
14 #include <vector> | |
15 | |
16 #include "webrtc/base/scoped_ptr.h" | |
17 #include "webrtc/modules/audio_coding/codecs/audio_encoder.h" | |
18 | |
19 namespace webrtc { | |
20 | |
21 class AudioEncoderPcm : public AudioEncoder { | |
22 public: | |
23 struct Config { | |
24 public: | |
25 bool IsOk() const; | |
26 | |
27 int frame_size_ms; | |
28 int num_channels; | |
29 int payload_type; | |
30 | |
31 protected: | |
32 explicit Config(int pt) | |
33 : frame_size_ms(20), num_channels(1), payload_type(pt) {} | |
34 }; | |
35 | |
36 ~AudioEncoderPcm() override; | |
37 | |
38 size_t MaxEncodedBytes() const override; | |
39 int SampleRateHz() const override; | |
40 int NumChannels() const override; | |
41 size_t Num10MsFramesInNextPacket() const override; | |
42 size_t Max10MsFramesInAPacket() const override; | |
43 int GetTargetBitrate() const override; | |
44 EncodedInfo EncodeInternal(uint32_t rtp_timestamp, | |
45 rtc::ArrayView<const int16_t> audio, | |
46 size_t max_encoded_bytes, | |
47 uint8_t* encoded) override; | |
48 void Reset() override; | |
49 | |
50 protected: | |
51 AudioEncoderPcm(const Config& config, int sample_rate_hz); | |
52 | |
53 virtual size_t EncodeCall(const int16_t* audio, | |
54 size_t input_len, | |
55 uint8_t* encoded) = 0; | |
56 | |
57 virtual int BytesPerSample() const = 0; | |
58 | |
59 private: | |
60 const int sample_rate_hz_; | |
61 const int num_channels_; | |
62 const int payload_type_; | |
63 const size_t num_10ms_frames_per_packet_; | |
64 const size_t full_frame_samples_; | |
65 std::vector<int16_t> speech_buffer_; | |
66 uint32_t first_timestamp_in_buffer_; | |
67 }; | |
68 | |
69 struct CodecInst; | |
70 | |
71 class AudioEncoderPcmA final : public AudioEncoderPcm { | |
72 public: | |
73 struct Config : public AudioEncoderPcm::Config { | |
74 Config() : AudioEncoderPcm::Config(8) {} | |
75 }; | |
76 | |
77 explicit AudioEncoderPcmA(const Config& config) | |
78 : AudioEncoderPcm(config, kSampleRateHz) {} | |
79 explicit AudioEncoderPcmA(const CodecInst& codec_inst); | |
80 | |
81 protected: | |
82 size_t EncodeCall(const int16_t* audio, | |
83 size_t input_len, | |
84 uint8_t* encoded) override; | |
85 | |
86 int BytesPerSample() const override; | |
87 | |
88 private: | |
89 static const int kSampleRateHz = 8000; | |
90 RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderPcmA); | |
91 }; | |
92 | |
93 class AudioEncoderPcmU final : public AudioEncoderPcm { | |
94 public: | |
95 struct Config : public AudioEncoderPcm::Config { | |
96 Config() : AudioEncoderPcm::Config(0) {} | |
97 }; | |
98 | |
99 explicit AudioEncoderPcmU(const Config& config) | |
100 : AudioEncoderPcm(config, kSampleRateHz) {} | |
101 explicit AudioEncoderPcmU(const CodecInst& codec_inst); | |
102 | |
103 protected: | |
104 size_t EncodeCall(const int16_t* audio, | |
105 size_t input_len, | |
106 uint8_t* encoded) override; | |
107 | |
108 int BytesPerSample() const override; | |
109 | |
110 private: | |
111 static const int kSampleRateHz = 8000; | |
112 RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderPcmU); | |
113 }; | |
114 | |
115 } // namespace webrtc | |
116 | |
117 #endif // WEBRTC_MODULES_AUDIO_CODING_CODECS_G711_INCLUDE_AUDIO_ENCODER_PCM_H_ | |
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