Pipeline.h

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#pragma once
 
#include "AudioTools/CoreAudio/AudioIO.h"
#include "AudioTools/CoreAudio/AudioOutput.h"
#include "AudioTools/CoreAudio/AudioStreams.h"
 
namespace audio_tools {

class Pipeline : public AudioStream {
  friend MultiOutput;
 
 public:
  Pipeline() = default;
  ~Pipeline() { end(); }
  bool add(ModifyingStream& io) {
    if (has_output) {
      LOGE("Output already defined");
      is_ok = false;
      return false;
    }
    if (has_input) {
      if (p_stream == nullptr) {
        LOGE("Input not defined");
        is_ok = false;
        return false;
      }
 
      // predecessor notifies successor
      if (p_ai_source != nullptr) {
        p_ai_source->addNotifyAudioChange(io);
      }
 
      // we set up an input chain
      components.push_back(&io);
      io.setStream(*p_stream);
      p_stream = &io;
      p_ai_source = &io;
    } else {
      // we assume an output chain
      if (size() > 0) {
        auto& last_c = last();
        last_c.setOutput(io);
        last_c.addNotifyAudioChange(io);
      }
      components.push_back(&io);
    }
    return true;
  }

  bool add(ModifyingOutput& out) {
    if (has_output) {
      LOGE("Output already defined");
      is_ok = false;
      return false;
    }
    if (has_input) {
      LOGE("Input not supported");
      is_ok = false;
      return false;
    }
    ModifyingStream* io = new ModifyingStreamAdapter(out);
    cleanup.push_back(io);
    return add(*io);
  }

  bool setOutput(AudioOutput& out) {
    p_out_print = &out;
    if (size() > 0) {
      last().addNotifyAudioChange(out);
    }
    return setOutput((Print&)out);
  }

  bool setOutput(AudioStream& out) {
    p_out_stream = &out;
    if (size() > 0) {
      last().addNotifyAudioChange(out);
    }
    return setOutput((Print&)out);
  }

  bool setOutput(Print& out) {
    if (has_output) {
      LOGE("Output already defined");
      is_ok = false;
      return false;
    }
    p_print = &out;
    if (size() > 0) {
      last().setOutput(out);
    }
    // must be last element
    has_output = true;
    return true;
  }

  bool setInput(AudioStream& in) {
    p_ai_source = ∈
    p_ai_input = ∈
    return setInput((Stream&)in);
  }

  bool setInput(Stream& in) {
    if (has_output) {
      LOGE("Defined as output");
      is_ok = false;
      return false;
    }
    if (has_input) {
      LOGE("Input already defined");
      is_ok = false;
      return false;
    }
    // must be first
    has_input = true;
    p_stream = ∈
    return true;
  }
 
  int availableForWrite() override {
    if (!is_active) return 0;
    if (size() == 0) {
      if (p_print != nullptr) return p_print->availableForWrite();
      return 0;
    }
    return components[0]->availableForWrite();
  }
 
  size_t write(const uint8_t* data, size_t len) override {
    if (!is_active) return 0;
    if (size() == 0) {
      if (p_print != nullptr) return p_print->write(data, len);
      return 0;
    }
    LOGD("write: %u", (unsigned)len);
    return components[0]->write(data, len);
  }
 
  int available() override {
    if (!is_active) return 0;
    Stream* in = getInput();
    if (in == nullptr) return 0;
    return in->available();
  }
 
  size_t readBytes(uint8_t* data, size_t len) override {
    if (!is_active) return 0;
    Stream* in = getInput();
    if (in == nullptr) return 0;
    return in->readBytes(data, len);
  }

  bool begin(AudioInfo info) {
    LOGI("begin");
    bool rc = begin();
    setAudioInfo(info);
    audioInfoOut().logInfo("pipeline out:");
    return rc;
  }

  bool begin() override {
    has_output = false;
    bool ok = true;
 
    // avoid too much noise
    setNotifyActive(false);
 
    // start components
    for (auto c : components) {
      ok = ok && c->begin();
    }
    // start output
    if (p_out_stream != nullptr) {
      ok = ok && p_out_stream->begin();
    } else if (p_out_print != nullptr) {
      ok = ok && p_out_print->begin();
    }
    // start input
    if (p_ai_input != nullptr) {
      ok = ok && p_ai_input->begin();
    }
 
    setNotifyActive(true);
    is_active = ok;
    is_ok = ok;
    return ok;
  }

  void end() override {
    for (auto c : components) {
      c->end();
    }
    components.clear();
    for (auto& c : cleanup) {
      delete c;
    }
    cleanup.clear();
 
    has_output = false;
    has_input = false;
    p_out_print = nullptr;
    p_out_stream = nullptr;
    p_print = nullptr;
    p_stream = nullptr;
    p_ai_source = nullptr;
    p_ai_input = nullptr;
    is_ok = false;
    is_active = true;
  }

  void setAudioInfo(AudioInfo newInfo) override {
    this->info = newInfo;
    if (has_input && p_ai_input != nullptr) {
      p_ai_input->setAudioInfo(info);
    } else if (has_output) {
      components[0]->setAudioInfo(info);
    }
  }

  AudioInfo audioInfoOut() override {
    AudioInfo info = audioInfo();
    if (size() > 0) {
      info = last().audioInfoOut();
    }
    return info;
  }

  bool hasComponents() { return size() > 0; }

  int size() { return components.size(); }

  ModifyingStream& last() { return *components[size() - 1]; }

  ModifyingStream& operator[](int idx) { return *components[idx]; }

  void addNotifyAudioChange(AudioInfoSupport& bi) override {
    if (size() > 0) last().addNotifyAudioChange(bi);
  }

  void setNotifyActive(bool flag) {
    is_notify_active = flag;
    for (auto c : components) {
      c->setNotifyActive(flag);
    }
  }

  void setActive(bool flag) { is_active = flag; }

  bool isActive() { return is_active; }

  bool isOK() { return is_ok; }

  operator bool() override { return is_ok && is_active; }
 
 protected:
  Vector<ModifyingStream*> components{0};
  Vector<ModifyingStream*> cleanup{0};
  bool has_output = false;
  bool has_input = false;
  bool is_ok = true;
  bool is_active = true;
  // prior input for input pipline
  Stream* p_stream = nullptr;
  AudioInfoSource* p_ai_source = nullptr;
  AudioStream* p_ai_input = nullptr;
  // output for notifications, begin and end calls
  AudioOutput* p_out_print = nullptr;
  AudioStream* p_out_stream = nullptr;
  Print* p_print = nullptr;

  struct ModifyingStreamAdapter : public ModifyingStream {
    ModifyingStreamAdapter(ModifyingOutput& out) { p_out = &out; }
    void setStream(Stream& in) override { p_out->setOutput(in); }
    void setOutput(Print& out) override { p_out->setOutput(out); }
    int available() override { return 0; }
 
    size_t write(const uint8_t* data, size_t len) override {
      return p_out->write(data, len);
    }
 
    bool begin() override { return p_out->begin(); }
 
    void end() override { p_out->end(); }
 
    void setAudioInfo(AudioInfo info) override { p_out->setAudioInfo(info); }
 
    void addNotifyAudioChange(AudioInfoSupport& bi) override {
      p_out->addNotifyAudioChange(bi);
    }
 
    void flush() override { p_out->flush(); }
 
   protected:
    ModifyingOutput* p_out = nullptr;
  };

  Stream* getInput() {
    Stream* in = p_stream;
    if (size() > 0) {
      in = &last();
    }
    return in;
  }
};
 
}  // namespace audio_tools