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 21 namespace webrtc { 22 23 class AudioEncoderPcm : public AudioEncoder { 24 public: 25 struct Config { 26 public: 27 bool IsOk() const; 28 29 int frame_size_ms; 30 size_t num_channels; 31 int payload_type; 32 33 protected: ConfigConfig34 explicit Config(int pt) 35 : frame_size_ms(20), num_channels(1), payload_type(pt) {} 36 }; 37 38 ~AudioEncoderPcm() override; 39 40 int SampleRateHz() const override; 41 size_t NumChannels() const override; 42 size_t Num10MsFramesInNextPacket() const override; 43 size_t Max10MsFramesInAPacket() const override; 44 int GetTargetBitrate() const override; 45 void Reset() override; 46 absl::optional<std::pair<TimeDelta, TimeDelta>> GetFrameLengthRange() 47 const override; 48 49 protected: 50 AudioEncoderPcm(const Config& config, int sample_rate_hz); 51 52 EncodedInfo EncodeImpl(uint32_t rtp_timestamp, 53 rtc::ArrayView<const int16_t> audio, 54 rtc::Buffer* encoded) override; 55 56 virtual size_t EncodeCall(const int16_t* audio, 57 size_t input_len, 58 uint8_t* encoded) = 0; 59 60 virtual size_t BytesPerSample() const = 0; 61 62 // Used to set EncodedInfoLeaf::encoder_type in 63 // AudioEncoderPcm::EncodeImpl 64 virtual AudioEncoder::CodecType GetCodecType() const = 0; 65 66 private: 67 const int sample_rate_hz_; 68 const size_t num_channels_; 69 const int payload_type_; 70 const size_t num_10ms_frames_per_packet_; 71 const size_t full_frame_samples_; 72 std::vector<int16_t> speech_buffer_; 73 uint32_t first_timestamp_in_buffer_; 74 }; 75 76 class AudioEncoderPcmA final : public AudioEncoderPcm { 77 public: 78 struct Config : public AudioEncoderPcm::Config { ConfigConfig79 Config() : AudioEncoderPcm::Config(8) {} 80 }; 81 AudioEncoderPcmA(const Config & config)82 explicit AudioEncoderPcmA(const Config& config) 83 : AudioEncoderPcm(config, kSampleRateHz) {} 84 85 AudioEncoderPcmA(const AudioEncoderPcmA&) = delete; 86 AudioEncoderPcmA& operator=(const AudioEncoderPcmA&) = delete; 87 88 protected: 89 size_t EncodeCall(const int16_t* audio, 90 size_t input_len, 91 uint8_t* encoded) override; 92 93 size_t BytesPerSample() const override; 94 95 AudioEncoder::CodecType GetCodecType() const override; 96 97 private: 98 static const int kSampleRateHz = 8000; 99 }; 100 101 class AudioEncoderPcmU final : public AudioEncoderPcm { 102 public: 103 struct Config : public AudioEncoderPcm::Config { ConfigConfig104 Config() : AudioEncoderPcm::Config(0) {} 105 }; 106 AudioEncoderPcmU(const Config & config)107 explicit AudioEncoderPcmU(const Config& config) 108 : AudioEncoderPcm(config, kSampleRateHz) {} 109 110 AudioEncoderPcmU(const AudioEncoderPcmU&) = delete; 111 AudioEncoderPcmU& operator=(const AudioEncoderPcmU&) = delete; 112 113 protected: 114 size_t EncodeCall(const int16_t* audio, 115 size_t input_len, 116 uint8_t* encoded) override; 117 118 size_t BytesPerSample() const override; 119 120 AudioEncoder::CodecType GetCodecType() const override; 121 122 private: 123 static const int kSampleRateHz = 8000; 124 }; 125 126 } // namespace webrtc 127 128 #endif // MODULES_AUDIO_CODING_CODECS_G711_AUDIO_ENCODER_PCM_H_ 129