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_AUDIO_ENCODER_PCM_H_ 12 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_G711_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 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 size_t MaxEncodedBytes() const override; 39 int SampleRateHz() const override; 40 size_t 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 size_t BytesPerSample() const = 0; 58 59 private: 60 const int sample_rate_hz_; 61 const size_t 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 { ConfigConfig74 Config() : AudioEncoderPcm::Config(8) {} 75 }; 76 AudioEncoderPcmA(const Config & config)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 size_t 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 { ConfigConfig96 Config() : AudioEncoderPcm::Config(0) {} 97 }; 98 AudioEncoderPcmU(const Config & config)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 size_t 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_AUDIO_ENCODER_PCM_H_ 118