audio.h

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#pragma once
 
// local includes
#include "platform/common.h"
#include "thread_safe.h"
#include "utility.h"
 
#include <bitset>
 
namespace audio {
  enum stream_config_e : int {
    STEREO,  
    HIGH_STEREO,  
    SURROUND51,  
    HIGH_SURROUND51,  
    SURROUND71,  
    HIGH_SURROUND71,  
    MAX_STREAM_CONFIG  
  };
 
  struct opus_stream_config_t {
    std::int32_t sampleRate;
    int channelCount;
    int streams;
    int coupledStreams;
    const std::uint8_t *mapping;
    int bitrate;
  };
 
  struct stream_params_t {
    int channelCount;
    int streams;
    int coupledStreams;
    std::uint8_t mapping[8];
  };
 
  extern opus_stream_config_t stream_configs[MAX_STREAM_CONFIG];
 
  struct config_t {
    enum flags_e : int {
      HIGH_QUALITY,  
      HOST_AUDIO,  
      CUSTOM_SURROUND_PARAMS,  
      CONTINUOUS_AUDIO,  
      MAX_FLAGS  
    };
 
    int packetDuration;
    int channels;
    int mask;
 
    stream_params_t customStreamParams;
 
    std::bitset<MAX_FLAGS> flags;
  };
 
  struct audio_ctx_t {
    // We want to change the sink for the first stream only
    std::unique_ptr<std::atomic_bool> sink_flag;
 
    std::unique_ptr<platf::audio_control_t> control;
 
    bool restore_sink;
    platf::sink_t sink;
  };
 
  using buffer_t = util::buffer_t<std::uint8_t>;
  using packet_t = std::pair<void *, buffer_t>;
  using audio_ctx_ref_t = safe::shared_t<audio_ctx_t>::ptr_t;
 
  void capture(safe::mail_t mail, config_t config, void *channel_data);
 
  audio_ctx_ref_t get_audio_ctx_ref();
 
  bool is_audio_ctx_sink_available(const audio_ctx_t &ctx);
}  // namespace audio