/*
 *  Copyright (c) 2015 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.
 */

#include "audio/audio_receive_stream.h"

#include <string>
#include <utility>

#include "absl/memory/memory.h"
#include "api/array_view.h"
#include "api/audio_codecs/audio_format.h"
#include "api/call/audio_sink.h"
#include "api/rtp_parameters.h"
#include "api/sequence_checker.h"
#include "audio/audio_send_stream.h"
#include "audio/audio_state.h"
#include "audio/channel_receive.h"
#include "audio/conversion.h"
#include "call/rtp_config.h"
#include "call/rtp_stream_receiver_controller_interface.h"
#include "modules/rtp_rtcp/source/rtp_packet_received.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
#include "rtc_base/strings/string_builder.h"
#include "rtc_base/time_utils.h"

namespace webrtc {

std::string AudioReceiveStreamInterface::Config::Rtp::ToString() const {
  char ss_buf[1024];
  rtc::SimpleStringBuilder ss(ss_buf);
  ss << "{remote_ssrc: " << remote_ssrc;
  ss << ", local_ssrc: " << local_ssrc;
  ss << ", nack: " << nack.ToString();
  ss << ", rtcp_event_observer: "
     << (rtcp_event_observer ? "(rtcp_event_observer)" : "nullptr");
  ss << '}';
  return ss.str();
}

std::string AudioReceiveStreamInterface::Config::ToString() const {
  char ss_buf[1024];
  rtc::SimpleStringBuilder ss(ss_buf);
  ss << "{rtp: " << rtp.ToString();
  ss << ", rtcp_send_transport: "
     << (rtcp_send_transport ? "(Transport)" : "null");
  if (!sync_group.empty()) {
    ss << ", sync_group: " << sync_group;
  }
  ss << '}';
  return ss.str();
}

namespace {
std::unique_ptr<voe::ChannelReceiveInterface> CreateChannelReceive(
    Clock* clock,
    webrtc::AudioState* audio_state,
    NetEqFactory* neteq_factory,
    const webrtc::AudioReceiveStreamInterface::Config& config,
    RtcEventLog* event_log) {
  RTC_DCHECK(audio_state);
  internal::AudioState* internal_audio_state =
      static_cast<internal::AudioState*>(audio_state);
  return voe::CreateChannelReceive(
      clock, neteq_factory, internal_audio_state->audio_device_module(),
      config.rtcp_send_transport, event_log, config.rtp.local_ssrc,
      config.rtp.remote_ssrc, config.jitter_buffer_max_packets,
      config.jitter_buffer_fast_accelerate, config.jitter_buffer_min_delay_ms,
      config.enable_non_sender_rtt, config.decoder_factory,
      config.codec_pair_id, std::move(config.frame_decryptor),
      config.crypto_options, std::move(config.frame_transformer),
      config.rtp.rtcp_event_observer);
}
}  // namespace

AudioReceiveStreamImpl::AudioReceiveStreamImpl(
    Clock* clock,
    PacketRouter* packet_router,
    NetEqFactory* neteq_factory,
    const webrtc::AudioReceiveStreamInterface::Config& config,
    const rtc::scoped_refptr<webrtc::AudioState>& audio_state,
    webrtc::RtcEventLog* event_log)
    : AudioReceiveStreamImpl(clock,
                             packet_router,
                             config,
                             audio_state,
                             event_log,
                             CreateChannelReceive(clock,
                                                  audio_state.get(),
                                                  neteq_factory,
                                                  config,
                                                  event_log)) {}

AudioReceiveStreamImpl::AudioReceiveStreamImpl(
    Clock* clock,
    PacketRouter* packet_router,
    const webrtc::AudioReceiveStreamInterface::Config& config,
    const rtc::scoped_refptr<webrtc::AudioState>& audio_state,
    webrtc::RtcEventLog* event_log,
    std::unique_ptr<voe::ChannelReceiveInterface> channel_receive)
    : config_(config),
      audio_state_(audio_state),
      source_tracker_(clock),
      channel_receive_(std::move(channel_receive)) {
  RTC_LOG(LS_INFO) << "AudioReceiveStreamImpl: " << config.rtp.remote_ssrc;
  RTC_DCHECK(config.decoder_factory);
  RTC_DCHECK(config.rtcp_send_transport);
  RTC_DCHECK(audio_state_);
  RTC_DCHECK(channel_receive_);

  packet_sequence_checker_.Detach();

  RTC_DCHECK(packet_router);
  // Configure bandwidth estimation.
  channel_receive_->RegisterReceiverCongestionControlObjects(packet_router);

  // When output is muted, ChannelReceive will directly notify the source
  // tracker of "delivered" frames, so RtpReceiver information will continue to
  // be updated.
  channel_receive_->SetSourceTracker(&source_tracker_);

  // Complete configuration.
  // TODO(solenberg): Config NACK history window (which is a packet count),
  // using the actual packet size for the configured codec.
  channel_receive_->SetNACKStatus(config.rtp.nack.rtp_history_ms != 0,
                                  config.rtp.nack.rtp_history_ms / 20);
  channel_receive_->SetReceiveCodecs(config.decoder_map);
  // `frame_transformer` and `frame_decryptor` have been given to
  // `channel_receive_` already.
}

AudioReceiveStreamImpl::~AudioReceiveStreamImpl() {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  RTC_LOG(LS_INFO) << "~AudioReceiveStreamImpl: " << remote_ssrc();
  Stop();
  channel_receive_->SetAssociatedSendChannel(nullptr);
  channel_receive_->ResetReceiverCongestionControlObjects();
}

void AudioReceiveStreamImpl::RegisterWithTransport(
    RtpStreamReceiverControllerInterface* receiver_controller) {
  RTC_DCHECK_RUN_ON(&packet_sequence_checker_);
  RTC_DCHECK(!rtp_stream_receiver_);
  rtp_stream_receiver_ = receiver_controller->CreateReceiver(
      remote_ssrc(), channel_receive_.get());
}

void AudioReceiveStreamImpl::UnregisterFromTransport() {
  RTC_DCHECK_RUN_ON(&packet_sequence_checker_);
  rtp_stream_receiver_.reset();
}

void AudioReceiveStreamImpl::ReconfigureForTesting(
    const webrtc::AudioReceiveStreamInterface::Config& config) {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);

  // SSRC can't be changed mid-stream.
  RTC_DCHECK_EQ(remote_ssrc(), config.rtp.remote_ssrc);
  RTC_DCHECK_EQ(local_ssrc(), config.rtp.local_ssrc);

  // Configuration parameters which cannot be changed.
  RTC_DCHECK_EQ(config_.rtcp_send_transport, config.rtcp_send_transport);
  // Decoder factory cannot be changed because it is configured at
  // voe::Channel construction time.
  RTC_DCHECK_EQ(config_.decoder_factory, config.decoder_factory);

  // TODO(solenberg): Config NACK history window (which is a packet count),
  // using the actual packet size for the configured codec.
  RTC_DCHECK_EQ(config_.rtp.nack.rtp_history_ms, config.rtp.nack.rtp_history_ms)
      << "Use SetUseTransportCcAndNackHistory";

  RTC_DCHECK(config_.decoder_map == config.decoder_map) << "Use SetDecoderMap";
  RTC_DCHECK_EQ(config_.frame_transformer, config.frame_transformer)
      << "Use SetDepacketizerToDecoderFrameTransformer";

  config_ = config;
}

void AudioReceiveStreamImpl::Start() {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  if (playing_) {
    return;
  }
  channel_receive_->StartPlayout();
  playing_ = true;
  audio_state()->AddReceivingStream(this);
}

void AudioReceiveStreamImpl::Stop() {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  if (!playing_) {
    return;
  }
  channel_receive_->StopPlayout();
  playing_ = false;
  audio_state()->RemoveReceivingStream(this);
}

bool AudioReceiveStreamImpl::IsRunning() const {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  return playing_;
}

void AudioReceiveStreamImpl::SetDepacketizerToDecoderFrameTransformer(
    rtc::scoped_refptr<webrtc::FrameTransformerInterface> frame_transformer) {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  channel_receive_->SetDepacketizerToDecoderFrameTransformer(
      std::move(frame_transformer));
}

void AudioReceiveStreamImpl::SetDecoderMap(
    std::map<int, SdpAudioFormat> decoder_map) {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  config_.decoder_map = std::move(decoder_map);
  channel_receive_->SetReceiveCodecs(config_.decoder_map);
}

void AudioReceiveStreamImpl::SetNackHistory(int history_ms) {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  RTC_DCHECK_GE(history_ms, 0);

  if (config_.rtp.nack.rtp_history_ms == history_ms)
    return;

  config_.rtp.nack.rtp_history_ms = history_ms;
  // TODO(solenberg): Config NACK history window (which is a packet count),
  // using the actual packet size for the configured codec.
  channel_receive_->SetNACKStatus(history_ms != 0, history_ms / 20);
}

void AudioReceiveStreamImpl::SetNonSenderRttMeasurement(bool enabled) {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  config_.enable_non_sender_rtt = enabled;
  channel_receive_->SetNonSenderRttMeasurement(enabled);
}

void AudioReceiveStreamImpl::SetFrameDecryptor(
    rtc::scoped_refptr<webrtc::FrameDecryptorInterface> frame_decryptor) {
  // TODO(bugs.webrtc.org/11993): This is called via WebRtcAudioReceiveStream,
  // expect to be called on the network thread.
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  channel_receive_->SetFrameDecryptor(std::move(frame_decryptor));
}

webrtc::AudioReceiveStreamInterface::Stats AudioReceiveStreamImpl::GetStats(
    bool get_and_clear_legacy_stats) const {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  webrtc::AudioReceiveStreamInterface::Stats stats;
  stats.remote_ssrc = remote_ssrc();

  webrtc::CallReceiveStatistics call_stats =
      channel_receive_->GetRTCPStatistics();
  // TODO(solenberg): Don't return here if we can't get the codec - return the
  //                  stats we *can* get.
  auto receive_codec = channel_receive_->GetReceiveCodec();
  if (!receive_codec) {
    return stats;
  }

  stats.payload_bytes_rcvd = call_stats.payload_bytes_rcvd;
  stats.header_and_padding_bytes_rcvd =
      call_stats.header_and_padding_bytes_rcvd;
  stats.packets_rcvd = call_stats.packetsReceived;
  stats.packets_lost = call_stats.cumulativeLost;
  stats.nacks_sent = call_stats.nacks_sent;
  stats.capture_start_ntp_time_ms = call_stats.capture_start_ntp_time_ms_;
  stats.last_packet_received_timestamp_ms =
      call_stats.last_packet_received_timestamp_ms;
  stats.codec_name = receive_codec->second.name;
  stats.codec_payload_type = receive_codec->first;
  int clockrate_khz = receive_codec->second.clockrate_hz / 1000;
  if (clockrate_khz > 0) {
    stats.jitter_ms = call_stats.jitterSamples / clockrate_khz;
  }
  stats.delay_estimate_ms = channel_receive_->GetDelayEstimate();
  stats.audio_level = channel_receive_->GetSpeechOutputLevelFullRange();
  stats.total_output_energy = channel_receive_->GetTotalOutputEnergy();
  stats.total_output_duration = channel_receive_->GetTotalOutputDuration();
  stats.estimated_playout_ntp_timestamp_ms =
      channel_receive_->GetCurrentEstimatedPlayoutNtpTimestampMs(
          rtc::TimeMillis());

  // Get jitter buffer and total delay (alg + jitter + playout) stats.
  auto ns = channel_receive_->GetNetworkStatistics(get_and_clear_legacy_stats);
  stats.packets_discarded = ns.packetsDiscarded;
  stats.fec_packets_received = ns.fecPacketsReceived;
  stats.fec_packets_discarded = ns.fecPacketsDiscarded;
  stats.jitter_buffer_ms = ns.currentBufferSize;
  stats.jitter_buffer_preferred_ms = ns.preferredBufferSize;
  stats.total_samples_received = ns.totalSamplesReceived;
  stats.concealed_samples = ns.concealedSamples;
  stats.silent_concealed_samples = ns.silentConcealedSamples;
  stats.concealment_events = ns.concealmentEvents;
  stats.jitter_buffer_delay_seconds =
      static_cast<double>(ns.jitterBufferDelayMs) /
      static_cast<double>(rtc::kNumMillisecsPerSec);
  stats.jitter_buffer_emitted_count = ns.jitterBufferEmittedCount;
  stats.jitter_buffer_target_delay_seconds =
      static_cast<double>(ns.jitterBufferTargetDelayMs) /
      static_cast<double>(rtc::kNumMillisecsPerSec);
  stats.jitter_buffer_minimum_delay_seconds =
      static_cast<double>(ns.jitterBufferMinimumDelayMs) /
      static_cast<double>(rtc::kNumMillisecsPerSec);
  stats.inserted_samples_for_deceleration = ns.insertedSamplesForDeceleration;
  stats.removed_samples_for_acceleration = ns.removedSamplesForAcceleration;
  stats.expand_rate = Q14ToFloat(ns.currentExpandRate);
  stats.speech_expand_rate = Q14ToFloat(ns.currentSpeechExpandRate);
  stats.secondary_decoded_rate = Q14ToFloat(ns.currentSecondaryDecodedRate);
  stats.secondary_discarded_rate = Q14ToFloat(ns.currentSecondaryDiscardedRate);
  stats.accelerate_rate = Q14ToFloat(ns.currentAccelerateRate);
  stats.preemptive_expand_rate = Q14ToFloat(ns.currentPreemptiveRate);
  stats.jitter_buffer_flushes = ns.packetBufferFlushes;
  stats.delayed_packet_outage_samples = ns.delayedPacketOutageSamples;
  stats.relative_packet_arrival_delay_seconds =
      static_cast<double>(ns.relativePacketArrivalDelayMs) /
      static_cast<double>(rtc::kNumMillisecsPerSec);
  stats.interruption_count = ns.interruptionCount;
  stats.total_interruption_duration_ms = ns.totalInterruptionDurationMs;

  auto ds = channel_receive_->GetDecodingCallStatistics();
  stats.decoding_calls_to_silence_generator = ds.calls_to_silence_generator;
  stats.decoding_calls_to_neteq = ds.calls_to_neteq;
  stats.decoding_normal = ds.decoded_normal;
  stats.decoding_plc = ds.decoded_neteq_plc;
  stats.decoding_codec_plc = ds.decoded_codec_plc;
  stats.decoding_cng = ds.decoded_cng;
  stats.decoding_plc_cng = ds.decoded_plc_cng;
  stats.decoding_muted_output = ds.decoded_muted_output;

  stats.last_sender_report_timestamp_ms =
      call_stats.last_sender_report_timestamp_ms;
  stats.last_sender_report_remote_timestamp_ms =
      call_stats.last_sender_report_remote_timestamp_ms;
  stats.sender_reports_packets_sent = call_stats.sender_reports_packets_sent;
  stats.sender_reports_bytes_sent = call_stats.sender_reports_bytes_sent;
  stats.sender_reports_reports_count = call_stats.sender_reports_reports_count;
  stats.round_trip_time = call_stats.round_trip_time;
  stats.round_trip_time_measurements = call_stats.round_trip_time_measurements;
  stats.total_round_trip_time = call_stats.total_round_trip_time;

  return stats;
}

void AudioReceiveStreamImpl::SetSink(AudioSinkInterface* sink) {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  channel_receive_->SetSink(sink);
}

void AudioReceiveStreamImpl::SetGain(float gain) {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  channel_receive_->SetChannelOutputVolumeScaling(gain);
}

bool AudioReceiveStreamImpl::SetBaseMinimumPlayoutDelayMs(int delay_ms) {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  return channel_receive_->SetBaseMinimumPlayoutDelayMs(delay_ms);
}

int AudioReceiveStreamImpl::GetBaseMinimumPlayoutDelayMs() const {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  return channel_receive_->GetBaseMinimumPlayoutDelayMs();
}

std::vector<RtpSource> AudioReceiveStreamImpl::GetSources() const {
  return source_tracker_.GetSources();
}

AudioMixer::Source::AudioFrameInfo
AudioReceiveStreamImpl::GetAudioFrameWithInfo(int sample_rate_hz,
                                              AudioFrame* audio_frame) {
  AudioMixer::Source::AudioFrameInfo audio_frame_info =
      channel_receive_->GetAudioFrameWithInfo(sample_rate_hz, audio_frame);
  if (audio_frame_info != AudioMixer::Source::AudioFrameInfo::kError) {
    source_tracker_.OnFrameDelivered(audio_frame->packet_infos_);
  }
  return audio_frame_info;
}

int AudioReceiveStreamImpl::Ssrc() const {
  return remote_ssrc();
}

int AudioReceiveStreamImpl::PreferredSampleRate() const {
  return channel_receive_->PreferredSampleRate();
}

uint32_t AudioReceiveStreamImpl::id() const {
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  return remote_ssrc();
}

absl::optional<Syncable::Info> AudioReceiveStreamImpl::GetInfo() const {
  // TODO(bugs.webrtc.org/11993): This is called via RtpStreamsSynchronizer,
  // expect to be called on the network thread.
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  return channel_receive_->GetSyncInfo();
}

bool AudioReceiveStreamImpl::GetPlayoutRtpTimestamp(uint32_t* rtp_timestamp,
                                                    int64_t* time_ms) const {
  // Called on video capture thread.
  return channel_receive_->GetPlayoutRtpTimestamp(rtp_timestamp, time_ms);
}

void AudioReceiveStreamImpl::SetEstimatedPlayoutNtpTimestampMs(
    int64_t ntp_timestamp_ms,
    int64_t time_ms) {
  // Called on video capture thread.
  channel_receive_->SetEstimatedPlayoutNtpTimestampMs(ntp_timestamp_ms,
                                                      time_ms);
}

bool AudioReceiveStreamImpl::SetMinimumPlayoutDelay(int delay_ms) {
  // TODO(bugs.webrtc.org/11993): This is called via RtpStreamsSynchronizer,
  // expect to be called on the network thread.
  RTC_DCHECK_RUN_ON(&worker_thread_checker_);
  return channel_receive_->SetMinimumPlayoutDelay(delay_ms);
}

void AudioReceiveStreamImpl::AssociateSendStream(
    internal::AudioSendStream* send_stream) {
  RTC_DCHECK_RUN_ON(&packet_sequence_checker_);
  channel_receive_->SetAssociatedSendChannel(
      send_stream ? send_stream->GetChannel() : nullptr);
  associated_send_stream_ = send_stream;
}

void AudioReceiveStreamImpl::DeliverRtcp(const uint8_t* packet, size_t length) {
  // TODO(solenberg): Tests call this function on a network thread, libjingle
  // calls on the worker thread. We should move towards always using a network
  // thread. Then this check can be enabled.
  // RTC_DCHECK(!thread_checker_.IsCurrent());
  channel_receive_->ReceivedRTCPPacket(packet, length);
}

void AudioReceiveStreamImpl::SetSyncGroup(absl::string_view sync_group) {
  RTC_DCHECK_RUN_ON(&packet_sequence_checker_);
  config_.sync_group = std::string(sync_group);
}

void AudioReceiveStreamImpl::SetLocalSsrc(uint32_t local_ssrc) {
  RTC_DCHECK_RUN_ON(&packet_sequence_checker_);
  // TODO(tommi): Consider storing local_ssrc in one place.
  config_.rtp.local_ssrc = local_ssrc;
  channel_receive_->OnLocalSsrcChange(local_ssrc);
}

uint32_t AudioReceiveStreamImpl::local_ssrc() const {
  RTC_DCHECK_RUN_ON(&packet_sequence_checker_);
  RTC_DCHECK_EQ(config_.rtp.local_ssrc, channel_receive_->GetLocalSsrc());
  return config_.rtp.local_ssrc;
}

const std::string& AudioReceiveStreamImpl::sync_group() const {
  RTC_DCHECK_RUN_ON(&packet_sequence_checker_);
  return config_.sync_group;
}

const AudioSendStream*
AudioReceiveStreamImpl::GetAssociatedSendStreamForTesting() const {
  RTC_DCHECK_RUN_ON(&packet_sequence_checker_);
  return associated_send_stream_;
}

internal::AudioState* AudioReceiveStreamImpl::audio_state() const {
  auto* audio_state = static_cast<internal::AudioState*>(audio_state_.get());
  RTC_DCHECK(audio_state);
  return audio_state;
}
}  // namespace webrtc
