// Copyright (c) 2005-2007, Rodrigo Braz Monteiro
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
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// Aegisub Project http://www.aegisub.org/

/// @file audio_player_portaudio.h
/// @see audio_player_portaudio.cpp
/// @ingroup audio_output
///

#ifdef WITH_PORTAUDIO

#include "include/aegisub/audio_player.h"

extern "C" {
#include <portaudio.h>
}

#include <map>
#include <string>
#include <vector>

class wxArrayString;

/// @class PortAudioPlayer
/// @brief PortAudio Player
///
class PortAudioPlayer final : public AudioPlayer {
	typedef std::vector<PaDeviceIndex> DeviceVec;
	/// Map of supported output devices from name -> device index
	std::map<std::string, DeviceVec> devices;

	/// The index of the default output devices sorted by host API priority
	DeviceVec default_device;

	float volume = 1.f;  ///< Current volume level
	int64_t current = 0; ///< Current position
	int64_t start = 0;   ///< Start position
	int64_t end = 0;     ///< End position
	PaTime pa_start;     ///< PortAudio internal start position

	PaStream *stream = nullptr; ///< PortAudio stream
	bool fallback_mono16 = false; 	///< whether to fall back to 16 bit mono

	/// @brief PortAudio callback, used to fill buffer for playback, and prime the playback buffer.
	/// @param inputBuffer     Input buffer.
	/// @param outputBuffer    Output buffer.
	/// @param framesPerBuffer Frames per buffer.
	/// @param timeInfo        PortAudio time information.
	/// @param statusFlags     Status flags
	/// @param userData        Local data to hand callback
	/// @return Whether to stop playback.
	static int paCallback(
		const void *inputBuffer,
		void *outputBuffer,
		unsigned long framesPerBuffer,
		const PaStreamCallbackTimeInfo*
		timeInfo,
		PaStreamCallbackFlags
		statusFlags,
		void *userData);

	/// @brief Called when the callback has finished.
	/// @param userData Local data to be handed to the callback.
	static void paStreamFinishedCallback(void *userData);

	PaSampleFormat GetSampleFormat(agi::AudioProvider *provider);

	/// Gather the list of output devices supported by a host API
	/// @param host_idx Host API ID
	void GatherDevices(PaHostApiIndex host_idx);

	void OpenStream();

public:
	/// @brief Constructor
	PortAudioPlayer(agi::AudioProvider *provider);

	/// @brief Destructor
	~PortAudioPlayer();

	/// @brief Play audio.
	/// @param start Start position.
	/// @param count Frame count
	void Play(int64_t start,int64_t count);
	/// @brief Stop Playback
	/// @param timerToo Stop display timer?
	void Stop();

	/// @brief Whether audio is currently being played.
	/// @return Status
	bool IsPlaying();

	/// @brief End position playback will stop at.
	/// @return End position.
	int64_t GetEndPosition() { return end; }
	/// @brief Get current stream position.
	/// @return Stream position
	int64_t GetCurrentPosition();

	/// @brief Set end position of playback
	/// @param pos End position
	void SetEndPosition(int64_t position) { end = position; }


	/// @brief Set volume level
	/// @param vol Volume
	void SetVolume(double vol) { volume = vol; }

	/// @brief Get current volume level
	/// @return Volume level
	double GetVolume() { return volume; }

	/// Get list of available output devices
	static wxArrayString GetOutputDevices();
};
#endif //ifdef WITH_PORTAUDIO
