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/*
* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_ENCODER_MULTI_CHANNEL_OPUS_IMPL_H_
#define MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_ENCODER_MULTI_CHANNEL_OPUS_IMPL_H_
#include <memory>
#include <utility>
#include <vector>
#include "absl/types/optional.h"
#include "api/audio_codecs/audio_encoder.h"
#include "api/audio_codecs/audio_format.h"
#include "api/audio_codecs/opus/audio_encoder_multi_channel_opus_config.h"
#include "api/units/time_delta.h"
#include "modules/audio_coding/codecs/opus/opus_interface.h"
namespace webrtc {
class RtcEventLog;
class AudioEncoderMultiChannelOpusImpl final : public AudioEncoder {
public:
AudioEncoderMultiChannelOpusImpl(
const AudioEncoderMultiChannelOpusConfig& config,
int payload_type);
~AudioEncoderMultiChannelOpusImpl() override;
AudioEncoderMultiChannelOpusImpl(const AudioEncoderMultiChannelOpusImpl&) =
delete;
AudioEncoderMultiChannelOpusImpl& operator=(
const AudioEncoderMultiChannelOpusImpl&) = delete;
// Static interface for use by BuiltinAudioEncoderFactory.
static constexpr const char* GetPayloadName() { return "multiopus"; }
static absl::optional<AudioCodecInfo> QueryAudioEncoder(
const SdpAudioFormat& format);
int SampleRateHz() const override;
size_t NumChannels() const override;
size_t Num10MsFramesInNextPacket() const override;
size_t Max10MsFramesInAPacket() const override;
int GetTargetBitrate() const override;
void Reset() override;
absl::optional<std::pair<TimeDelta, TimeDelta>> GetFrameLengthRange()
const override;
protected:
EncodedInfo EncodeImpl(uint32_t rtp_timestamp,
rtc::ArrayView<const int16_t> audio,
rtc::Buffer* encoded) override;
private:
static absl::optional<AudioEncoderMultiChannelOpusConfig> SdpToConfig(
const SdpAudioFormat& format);
static AudioCodecInfo QueryAudioEncoder(
const AudioEncoderMultiChannelOpusConfig& config);
static std::unique_ptr<AudioEncoder> MakeAudioEncoder(
const AudioEncoderMultiChannelOpusConfig&,
int payload_type);
size_t Num10msFramesPerPacket() const;
size_t SamplesPer10msFrame() const;
size_t SufficientOutputBufferSize() const;
bool RecreateEncoderInstance(
const AudioEncoderMultiChannelOpusConfig& config);
void SetFrameLength(int frame_length_ms);
void SetNumChannelsToEncode(size_t num_channels_to_encode);
void SetProjectedPacketLossRate(float fraction);
AudioEncoderMultiChannelOpusConfig config_;
const int payload_type_;
std::vector<int16_t> input_buffer_;
OpusEncInst* inst_;
uint32_t first_timestamp_in_buffer_;
size_t num_channels_to_encode_;
int next_frame_length_ms_;
friend struct AudioEncoderMultiChannelOpus;
};
} // namespace webrtc
#endif // MODULES_AUDIO_CODING_CODECS_OPUS_AUDIO_ENCODER_MULTI_CHANNEL_OPUS_IMPL_H_
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