| /* |
| * Copyright (c) 2013 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_ACM2_ACM_RECEIVER_H_ |
| #define WEBRTC_MODULES_AUDIO_CODING_ACM2_ACM_RECEIVER_H_ |
| |
| #include <map> |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "webrtc/common_audio/vad/include/webrtc_vad.h" |
| #include "webrtc/modules/audio_coding/acm2/acm_resampler.h" |
| #include "webrtc/modules/audio_coding/acm2/call_statistics.h" |
| #include "webrtc/modules/audio_coding/include/audio_coding_module.h" |
| #include "webrtc/modules/audio_coding/neteq/include/neteq.h" |
| #include "webrtc/modules/include/module_common_types.h" |
| #include "webrtc/rtc_base/array_view.h" |
| #include "webrtc/rtc_base/criticalsection.h" |
| #include "webrtc/rtc_base/optional.h" |
| #include "webrtc/rtc_base/thread_annotations.h" |
| #include "webrtc/typedefs.h" |
| |
| namespace webrtc { |
| |
| struct CodecInst; |
| class NetEq; |
| |
| namespace acm2 { |
| |
| class AcmReceiver { |
| public: |
| // Constructor of the class |
| explicit AcmReceiver(const AudioCodingModule::Config& config); |
| |
| // Destructor of the class. |
| ~AcmReceiver(); |
| |
| // |
| // Inserts a payload with its associated RTP-header into NetEq. |
| // |
| // Input: |
| // - rtp_header : RTP header for the incoming payload containing |
| // information about payload type, sequence number, |
| // timestamp, SSRC and marker bit. |
| // - incoming_payload : Incoming audio payload. |
| // - length_payload : Length of incoming audio payload in bytes. |
| // |
| // Return value : 0 if OK. |
| // <0 if NetEq returned an error. |
| // |
| int InsertPacket(const WebRtcRTPHeader& rtp_header, |
| rtc::ArrayView<const uint8_t> incoming_payload); |
| |
| // |
| // Asks NetEq for 10 milliseconds of decoded audio. |
| // |
| // Input: |
| // -desired_freq_hz : specifies the sampling rate [Hz] of the output |
| // audio. If set -1 indicates to resampling is |
| // is required and the audio returned at the |
| // sampling rate of the decoder. |
| // |
| // Output: |
| // -audio_frame : an audio frame were output data and |
| // associated parameters are written to. |
| // -muted : if true, the sample data in audio_frame is not |
| // populated, and must be interpreted as all zero. |
| // |
| // Return value : 0 if OK. |
| // -1 if NetEq returned an error. |
| // |
| int GetAudio(int desired_freq_hz, AudioFrame* audio_frame, bool* muted); |
| |
| // Replace the current set of decoders with the specified set. |
| void SetCodecs(const std::map<int, SdpAudioFormat>& codecs); |
| |
| // |
| // Adds a new codec to the NetEq codec database. |
| // |
| // Input: |
| // - acm_codec_id : ACM codec ID; -1 means external decoder. |
| // - payload_type : payload type. |
| // - sample_rate_hz : sample rate. |
| // - audio_decoder : pointer to a decoder object. If it's null, then |
| // NetEq will internally create a decoder object |
| // based on the value of |acm_codec_id| (which |
| // mustn't be -1). Otherwise, NetEq will use the |
| // given decoder for the given payload type. NetEq |
| // won't take ownership of the decoder; it's up to |
| // the caller to delete it when it's no longer |
| // needed. |
| // |
| // Providing an existing decoder object here is |
| // necessary for external decoders, but may also be |
| // used for built-in decoders if NetEq doesn't have |
| // all the info it needs to construct them properly |
| // (e.g. iSAC, where the decoder needs to be paired |
| // with an encoder). |
| // |
| // Return value : 0 if OK. |
| // <0 if NetEq returned an error. |
| // |
| int AddCodec(int acm_codec_id, |
| uint8_t payload_type, |
| size_t channels, |
| int sample_rate_hz, |
| AudioDecoder* audio_decoder, |
| const std::string& name); |
| |
| // Adds a new decoder to the NetEq codec database. Returns true iff |
| // successful. |
| bool AddCodec(int rtp_payload_type, const SdpAudioFormat& audio_format); |
| |
| // |
| // Sets a minimum delay for packet buffer. The given delay is maintained, |
| // unless channel condition dictates a higher delay. |
| // |
| // Input: |
| // - delay_ms : minimum delay in milliseconds. |
| // |
| // Return value : 0 if OK. |
| // <0 if NetEq returned an error. |
| // |
| int SetMinimumDelay(int delay_ms); |
| |
| // |
| // Sets a maximum delay [ms] for the packet buffer. The target delay does not |
| // exceed the given value, even if channel condition requires so. |
| // |
| // Input: |
| // - delay_ms : maximum delay in milliseconds. |
| // |
| // Return value : 0 if OK. |
| // <0 if NetEq returned an error. |
| // |
| int SetMaximumDelay(int delay_ms); |
| |
| // |
| // Get least required delay computed based on channel conditions. Note that |
| // this is before applying any user-defined limits (specified by calling |
| // (SetMinimumDelay() and/or SetMaximumDelay()). |
| // |
| int LeastRequiredDelayMs() const; |
| |
| // |
| // Resets the initial delay to zero. |
| // |
| void ResetInitialDelay(); |
| |
| // Returns the sample rate of the decoder associated with the last incoming |
| // packet. If no packet of a registered non-CNG codec has been received, the |
| // return value is empty. Also, if the decoder was unregistered since the last |
| // packet was inserted, the return value is empty. |
| rtc::Optional<int> last_packet_sample_rate_hz() const; |
| |
| // Returns last_output_sample_rate_hz from the NetEq instance. |
| int last_output_sample_rate_hz() const; |
| |
| // |
| // Get the current network statistics from NetEq. |
| // |
| // Output: |
| // - statistics : The current network statistics. |
| // |
| void GetNetworkStatistics(NetworkStatistics* statistics); |
| |
| // |
| // Flushes the NetEq packet and speech buffers. |
| // |
| void FlushBuffers(); |
| |
| // |
| // Removes a payload-type from the NetEq codec database. |
| // |
| // Input: |
| // - payload_type : the payload-type to be removed. |
| // |
| // Return value : 0 if OK. |
| // -1 if an error occurred. |
| // |
| int RemoveCodec(uint8_t payload_type); |
| |
| // |
| // Remove all registered codecs. |
| // |
| void RemoveAllCodecs(); |
| |
| // Returns the RTP timestamp for the last sample delivered by GetAudio(). |
| // The return value will be empty if no valid timestamp is available. |
| rtc::Optional<uint32_t> GetPlayoutTimestamp(); |
| |
| // Returns the current total delay from NetEq (packet buffer and sync buffer) |
| // in ms, with smoothing applied to even out short-time fluctuations due to |
| // jitter. The packet buffer part of the delay is not updated during DTX/CNG |
| // periods. |
| // |
| int FilteredCurrentDelayMs() const; |
| |
| // |
| // Get the audio codec associated with the last non-CNG/non-DTMF received |
| // payload. If no non-CNG/non-DTMF packet is received -1 is returned, |
| // otherwise return 0. |
| // |
| int LastAudioCodec(CodecInst* codec) const; |
| |
| rtc::Optional<SdpAudioFormat> LastAudioFormat() const; |
| |
| // |
| // Get a decoder given its registered payload-type. |
| // |
| // Input: |
| // -payload_type : the payload-type of the codec to be retrieved. |
| // |
| // Output: |
| // -codec : codec associated with the given payload-type. |
| // |
| // Return value : 0 if succeeded. |
| // -1 if failed, e.g. given payload-type is not |
| // registered. |
| // |
| int DecoderByPayloadType(uint8_t payload_type, |
| CodecInst* codec) const; |
| |
| // |
| // Enable NACK and set the maximum size of the NACK list. If NACK is already |
| // enabled then the maximum NACK list size is modified accordingly. |
| // |
| // Input: |
| // -max_nack_list_size : maximum NACK list size |
| // should be positive (none zero) and less than or |
| // equal to |Nack::kNackListSizeLimit| |
| // Return value |
| // : 0 if succeeded. |
| // -1 if failed |
| // |
| int EnableNack(size_t max_nack_list_size); |
| |
| // Disable NACK. |
| void DisableNack(); |
| |
| // |
| // Get a list of packets to be retransmitted. |
| // |
| // Input: |
| // -round_trip_time_ms : estimate of the round-trip-time (in milliseconds). |
| // Return value : list of packets to be retransmitted. |
| // |
| std::vector<uint16_t> GetNackList(int64_t round_trip_time_ms) const; |
| |
| // |
| // Get statistics of calls to GetAudio(). |
| void GetDecodingCallStatistics(AudioDecodingCallStats* stats) const; |
| |
| private: |
| struct Decoder { |
| int acm_codec_id; |
| uint8_t payload_type; |
| // This field is meaningful for codecs where both mono and |
| // stereo versions are registered under the same ID. |
| size_t channels; |
| int sample_rate_hz; |
| }; |
| |
| const rtc::Optional<CodecInst> RtpHeaderToDecoder( |
| const RTPHeader& rtp_header, |
| uint8_t first_payload_byte) const EXCLUSIVE_LOCKS_REQUIRED(crit_sect_); |
| |
| uint32_t NowInTimestamp(int decoder_sampling_rate) const; |
| |
| rtc::CriticalSection crit_sect_; |
| rtc::Optional<CodecInst> last_audio_decoder_ GUARDED_BY(crit_sect_); |
| rtc::Optional<SdpAudioFormat> last_audio_format_ GUARDED_BY(crit_sect_); |
| ACMResampler resampler_ GUARDED_BY(crit_sect_); |
| std::unique_ptr<int16_t[]> last_audio_buffer_ GUARDED_BY(crit_sect_); |
| CallStatistics call_stats_ GUARDED_BY(crit_sect_); |
| const std::unique_ptr<NetEq> neteq_; // NetEq is thread-safe; no lock needed. |
| const Clock* const clock_; |
| bool resampled_last_output_frame_ GUARDED_BY(crit_sect_); |
| rtc::Optional<int> last_packet_sample_rate_hz_ GUARDED_BY(crit_sect_); |
| }; |
| |
| } // namespace acm2 |
| |
| } // namespace webrtc |
| |
| #endif // WEBRTC_MODULES_AUDIO_CODING_ACM2_ACM_RECEIVER_H_ |
