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 <vector> 15 16 #include "api/audio_codecs/audio_encoder.h" 17 #include "rtc_base/constructormagic.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 size_t num_channels; 29 int payload_type; 30 31 protected: ConfigConfig32 explicit Config(int pt) 33 : frame_size_ms(20), num_channels(1), payload_type(pt) {} 34 }; 35 36 ~AudioEncoderPcm() override; 37 38 int SampleRateHz() const override; 39 size_t NumChannels() const override; 40 size_t Num10MsFramesInNextPacket() const override; 41 size_t Max10MsFramesInAPacket() const override; 42 int GetTargetBitrate() const override; 43 void Reset() override; 44 45 protected: 46 AudioEncoderPcm(const Config& config, int sample_rate_hz); 47 48 EncodedInfo EncodeImpl(uint32_t rtp_timestamp, 49 rtc::ArrayView<const int16_t> audio, 50 rtc::Buffer* encoded) override; 51 52 virtual size_t EncodeCall(const int16_t* audio, 53 size_t input_len, 54 uint8_t* encoded) = 0; 55 56 virtual size_t BytesPerSample() const = 0; 57 58 // Used to set EncodedInfoLeaf::encoder_type in 59 // AudioEncoderPcm::EncodeImpl 60 virtual AudioEncoder::CodecType GetCodecType() const = 0; 61 62 private: 63 const int sample_rate_hz_; 64 const size_t num_channels_; 65 const int payload_type_; 66 const size_t num_10ms_frames_per_packet_; 67 const size_t full_frame_samples_; 68 std::vector<int16_t> speech_buffer_; 69 uint32_t first_timestamp_in_buffer_; 70 }; 71 72 struct CodecInst; 73 74 class AudioEncoderPcmA final : public AudioEncoderPcm { 75 public: 76 struct Config : public AudioEncoderPcm::Config { ConfigConfig77 Config() : AudioEncoderPcm::Config(8) {} 78 }; 79 AudioEncoderPcmA(const Config & config)80 explicit AudioEncoderPcmA(const Config& config) 81 : AudioEncoderPcm(config, kSampleRateHz) {} 82 explicit AudioEncoderPcmA(const CodecInst& codec_inst); 83 84 protected: 85 size_t EncodeCall(const int16_t* audio, 86 size_t input_len, 87 uint8_t* encoded) override; 88 89 size_t BytesPerSample() const override; 90 91 AudioEncoder::CodecType GetCodecType() const override; 92 93 private: 94 static const int kSampleRateHz = 8000; 95 RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderPcmA); 96 }; 97 98 class AudioEncoderPcmU final : public AudioEncoderPcm { 99 public: 100 struct Config : public AudioEncoderPcm::Config { ConfigConfig101 Config() : AudioEncoderPcm::Config(0) {} 102 }; 103 AudioEncoderPcmU(const Config & config)104 explicit AudioEncoderPcmU(const Config& config) 105 : AudioEncoderPcm(config, kSampleRateHz) {} 106 explicit AudioEncoderPcmU(const CodecInst& codec_inst); 107 108 protected: 109 size_t EncodeCall(const int16_t* audio, 110 size_t input_len, 111 uint8_t* encoded) override; 112 113 size_t BytesPerSample() const override; 114 115 AudioEncoder::CodecType GetCodecType() const override; 116 117 private: 118 static const int kSampleRateHz = 8000; 119 RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderPcmU); 120 }; 121 122 } // namespace webrtc 123 124 #endif // MODULES_AUDIO_CODING_CODECS_G711_AUDIO_ENCODER_PCM_H_ 125