| /* |
| * 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 WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_AUDIO_ENCODER_ISAC_T_H_ |
| #define WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_AUDIO_ENCODER_ISAC_T_H_ |
| |
| #include <vector> |
| |
| #include "webrtc/api/audio_codecs/audio_encoder.h" |
| #include "webrtc/api/audio_codecs/audio_format.h" |
| #include "webrtc/modules/audio_coding/codecs/isac/locked_bandwidth_info.h" |
| #include "webrtc/rtc_base/constructormagic.h" |
| #include "webrtc/rtc_base/scoped_ref_ptr.h" |
| |
| namespace webrtc { |
| |
| struct CodecInst; |
| |
| 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; |
| |
| rtc::scoped_refptr<LockedIsacBandwidthInfo> bwinfo; |
| |
| 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; |
| |
| // If true, the encoder will dynamically adjust frame size and bit rate; |
| // the configured values are then merely the starting point. |
| bool adaptive_mode = false; |
| |
| // In adaptive mode, prevent adaptive changes to the frame size. (Not used |
| // in nonadaptive mode.) |
| bool enforce_frame_size = false; |
| }; |
| |
| explicit AudioEncoderIsacT(const Config& config); |
| explicit AudioEncoderIsacT( |
| const CodecInst& codec_inst, |
| const rtc::scoped_refptr<LockedIsacBandwidthInfo>& bwinfo); |
| AudioEncoderIsacT(int payload_type, const SdpAudioFormat& format); |
| ~AudioEncoderIsacT() override; |
| |
| static constexpr const char* GetPayloadName() { return "ISAC"; } |
| static rtc::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; |
| EncodedInfo EncodeImpl(uint32_t rtp_timestamp, |
| rtc::ArrayView<const int16_t> audio, |
| rtc::Buffer* encoded) override; |
| void Reset() 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 const int kDefaultBitRate = 32000; |
| |
| // 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; |
| rtc::scoped_refptr<LockedIsacBandwidthInfo> bwinfo_; |
| |
| // 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_; |
| |
| RTC_DISALLOW_COPY_AND_ASSIGN(AudioEncoderIsacT); |
| }; |
| |
| } // namespace webrtc |
| |
| #endif // WEBRTC_MODULES_AUDIO_CODING_CODECS_ISAC_AUDIO_ENCODER_ISAC_T_H_ |