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_G711_AUDIO_ENCODER_PCM_H_ 12 #define MODULES_AUDIO_CODING_CODECS_G711_AUDIO_ENCODER_PCM_H_ 13 14 #include <utility> 15 #include <vector> 16 17 #include "absl/types/optional.h" 18 #include "api/audio_codecs/audio_encoder.h" 19 #include "api/units/time_delta.h" 20 #include "rtc_base/constructor_magic.h" 21 22 namespace webrtc { 23 24 class AudioEncoderPcm : public AudioEncoder { 25 public: 26 struct Config { 27 public: 28 bool IsOk() const; 29 30 int frame_size_ms; 31 size_t num_channels; 32 int payload_type; 33 34 protected: ConfigConfig35 explicit Config(int pt) 36 : frame_size_ms(20), num_channels(1), payload_type(pt) {} 37 }; 38 39 ~AudioEncoderPcm() override; 40 41 int SampleRateHz() const override; 42 size_t NumChannels() const override; 43 size_t Num10MsFramesInNextPacket() const override; 44 size_t Max10MsFramesInAPacket() const override; 45 int GetTargetBitrate() const override; 46 void Reset() override; 47 absl::optional<std::pair<TimeDelta, TimeDelta>> GetFrameLengthRange() 48 const override; 49 50 protected: 51 AudioEncoderPcm(const Config& config, int sample_rate_hz); 52 53 EncodedInfo EncodeImpl(uint32_t rtp_timestamp, 54 rtc::ArrayView<const int16_t> audio, 55 rtc::Buffer* encoded) override; 56 57 virtual size_t EncodeCall(const int16_t* audio, 58 size_t input_len, 59 uint8_t* encoded) = 0; 60 61 virtual size_t BytesPerSample() const = 0; 62 63 // Used to set EncodedInfoLeaf::encoder_type in 64 // AudioEncoderPcm::EncodeImpl 65 virtual AudioEncoder::CodecType GetCodecType() const = 0; 66 67 private: 68 const int sample_rate_hz_; 69 const size_t num_channels_; 70 const int payload_type_; 71 const size_t num_10ms_frames_per_packet_; 72 const size_t full_frame_samples_; 73 std::vector<int16_t> speech_buffer_; 74 uint32_t first_timestamp_in_buffer_; 75 }; 76 77 class AudioEncoderPcmA final : public AudioEncoderPcm { 78 public: 79 struct Config : public AudioEncoderPcm::Config { ConfigConfig80 Config() : AudioEncoderPcm::Config(8) {} 81 }; 82 AudioEncoderPcmA(const Config & config)83 explicit AudioEncoderPcmA(const Config& config) 84 : AudioEncoderPcm(config, kSampleRateHz) {} 85 86 protected: 87 size_t EncodeCall(const int16_t* audio, 88 size_t input_len, 89 uint8_t* encoded) override; 90 91 size_t BytesPerSample() const override; 92 93 AudioEncoder::CodecType GetCodecType() const override; 94 95 private: 96 static const int kSampleRateHz = 8000; 97 RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderPcmA); 98 }; 99 100 class AudioEncoderPcmU final : public AudioEncoderPcm { 101 public: 102 struct Config : public AudioEncoderPcm::Config { ConfigConfig103 Config() : AudioEncoderPcm::Config(0) {} 104 }; 105 AudioEncoderPcmU(const Config & config)106 explicit AudioEncoderPcmU(const Config& config) 107 : AudioEncoderPcm(config, kSampleRateHz) {} 108 109 protected: 110 size_t EncodeCall(const int16_t* audio, 111 size_t input_len, 112 uint8_t* encoded) override; 113 114 size_t BytesPerSample() const override; 115 116 AudioEncoder::CodecType GetCodecType() const override; 117 118 private: 119 static const int kSampleRateHz = 8000; 120 RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderPcmU); 121 }; 122 123 } // namespace webrtc 124 125 #endif // MODULES_AUDIO_CODING_CODECS_G711_AUDIO_ENCODER_PCM_H_ 126