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/*
* Copyright (c) 2014 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_ISAC_AUDIO_ENCODER_ISAC_T_H_
#define MODULES_AUDIO_CODING_CODECS_ISAC_AUDIO_ENCODER_ISAC_T_H_
#include <utility>
#include <vector>
#include "absl/types/optional.h"
#include "api/audio_codecs/audio_encoder.h"
#include "api/scoped_refptr.h"
#include "api/units/time_delta.h"
#include "rtc_base/constructor_magic.h"
#include "system_wrappers/include/field_trial.h"
namespace webrtc {
template <typename T>
class AudioEncoderIsacT final : public AudioEncoder {
public:
// Allowed combinations of sample rate, frame size, and bit rate are
// - 16000 Hz, 30 ms, 10000-32000 bps
// - 16000 Hz, 60 ms, 10000-32000 bps
// - 32000 Hz, 30 ms, 10000-56000 bps (if T has super-wideband support)
struct Config {
bool IsOk() const;
int payload_type = 103;
int sample_rate_hz = 16000;
int frame_size_ms = 30;
int bit_rate = kDefaultBitRate; // Limit on the short-term average bit
// rate, in bits/s.
int max_payload_size_bytes = -1;
int max_bit_rate = -1;
};
explicit AudioEncoderIsacT(const Config& config);
~AudioEncoderIsacT() override;
int SampleRateHz() const override;
size_t NumChannels() const override;
size_t Num10MsFramesInNextPacket() const override;
size_t Max10MsFramesInAPacket() const override;
int GetTargetBitrate() const override;
void SetTargetBitrate(int target_bps) override;
void OnReceivedTargetAudioBitrate(int target_bps) override;
void OnReceivedUplinkBandwidth(
int target_audio_bitrate_bps,
absl::optional<int64_t> bwe_period_ms) override;
void OnReceivedUplinkAllocation(BitrateAllocationUpdate update) override;
void OnReceivedOverhead(size_t overhead_bytes_per_packet) override;
EncodedInfo EncodeImpl(uint32_t rtp_timestamp,
rtc::ArrayView<const int16_t> audio,
rtc::Buffer* encoded) override;
void Reset() override;
absl::optional<std::pair<TimeDelta, TimeDelta>> GetFrameLengthRange()
const override;
private:
// This value is taken from STREAM_SIZE_MAX_60 for iSAC float (60 ms) and
// STREAM_MAXW16_60MS for iSAC fix (60 ms).
static const size_t kSufficientEncodeBufferSizeBytes = 400;
static constexpr int kDefaultBitRate = 32000;
static constexpr int kMinBitrateBps = 10000;
static constexpr int MaxBitrateBps(int sample_rate_hz) {
return sample_rate_hz == 32000 ? 56000 : 32000;
}
void SetTargetBitrate(int target_bps, bool subtract_per_packet_overhead);
// Recreate the iSAC encoder instance with the given settings, and save them.
void RecreateEncoderInstance(const Config& config);
Config config_;
typename T::instance_type* isac_state_ = nullptr;
// Have we accepted input but not yet emitted it in a packet?
bool packet_in_progress_ = false;
// Timestamp of the first input of the currently in-progress packet.
uint32_t packet_timestamp_;
// Timestamp of the previously encoded packet.
uint32_t last_encoded_timestamp_;
// Cache the value of the "WebRTC-SendSideBwe-WithOverhead" field trial.
const bool send_side_bwe_with_overhead_ =
field_trial::IsEnabled("WebRTC-SendSideBwe-WithOverhead");
// When we send a packet, expect this many bytes of headers to be added to it.
// Start out with a reasonable default that we can use until we receive a real
// value.
DataSize overhead_per_packet_ = DataSize::Bytes(28);
RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderIsacT);
};
} // namespace webrtc
#endif // MODULES_AUDIO_CODING_CODECS_ISAC_AUDIO_ENCODER_ISAC_T_H_
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