1 /* 2 * Copyright (c) 2019 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_OPUS_AUDIO_ENCODER_MULTI_CHANNEL_OPUS_IMPL_H_ 12 #define MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_ENCODER_MULTI_CHANNEL_OPUS_IMPL_H_ 13 14 #include <memory> 15 #include <utility> 16 #include <vector> 17 18 #include "absl/types/optional.h" 19 #include "api/audio_codecs/audio_encoder.h" 20 #include "api/audio_codecs/audio_format.h" 21 #include "api/audio_codecs/opus/audio_encoder_multi_channel_opus_config.h" 22 #include "api/units/time_delta.h" 23 #include "modules/audio_coding/codecs/opus/opus_interface.h" 24 #include "rtc_base/constructor_magic.h" 25 26 namespace webrtc { 27 28 class RtcEventLog; 29 30 class AudioEncoderMultiChannelOpusImpl final : public AudioEncoder { 31 public: 32 AudioEncoderMultiChannelOpusImpl( 33 const AudioEncoderMultiChannelOpusConfig& config, 34 int payload_type); 35 ~AudioEncoderMultiChannelOpusImpl() override; 36 37 // Static interface for use by BuiltinAudioEncoderFactory. GetPayloadName()38 static constexpr const char* GetPayloadName() { return "multiopus"; } 39 static absl::optional<AudioCodecInfo> QueryAudioEncoder( 40 const SdpAudioFormat& format); 41 42 int SampleRateHz() const override; 43 size_t NumChannels() const override; 44 size_t Num10MsFramesInNextPacket() const override; 45 size_t Max10MsFramesInAPacket() const override; 46 int GetTargetBitrate() const override; 47 48 void Reset() override; 49 absl::optional<std::pair<TimeDelta, TimeDelta>> GetFrameLengthRange() 50 const override; 51 52 protected: 53 EncodedInfo EncodeImpl(uint32_t rtp_timestamp, 54 rtc::ArrayView<const int16_t> audio, 55 rtc::Buffer* encoded) override; 56 57 private: 58 static absl::optional<AudioEncoderMultiChannelOpusConfig> SdpToConfig( 59 const SdpAudioFormat& format); 60 static AudioCodecInfo QueryAudioEncoder( 61 const AudioEncoderMultiChannelOpusConfig& config); 62 static std::unique_ptr<AudioEncoder> MakeAudioEncoder( 63 const AudioEncoderMultiChannelOpusConfig&, 64 int payload_type); 65 66 size_t Num10msFramesPerPacket() const; 67 size_t SamplesPer10msFrame() const; 68 size_t SufficientOutputBufferSize() const; 69 bool RecreateEncoderInstance( 70 const AudioEncoderMultiChannelOpusConfig& config); 71 void SetFrameLength(int frame_length_ms); 72 void SetNumChannelsToEncode(size_t num_channels_to_encode); 73 void SetProjectedPacketLossRate(float fraction); 74 75 AudioEncoderMultiChannelOpusConfig config_; 76 const int payload_type_; 77 std::vector<int16_t> input_buffer_; 78 OpusEncInst* inst_; 79 uint32_t first_timestamp_in_buffer_; 80 size_t num_channels_to_encode_; 81 int next_frame_length_ms_; 82 83 friend struct AudioEncoderMultiChannelOpus; 84 RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderMultiChannelOpusImpl); 85 }; 86 87 } // namespace webrtc 88 89 #endif // MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_ENCODER_MULTI_CHANNEL_OPUS_IMPL_H_ 90