XAudioPlay.cpp

#include "XAudioPlay.h"
#include <QAudioFormat>
#include <QAudioOutput>
#include <mutex>
class CXAudioPlay :public XAudioPlay
{
public:
	QAudioOutput* output = NULL;
	QIODevice* io = NULL;
	std::mutex mux;

	virtual bool Open() {
		Close();
		QAudioFormat fmt;
		fmt.setSampleRate(sampleRate);
		fmt.setSampleSize(sampleSize);
		fmt.setChannelCount(channels);
		fmt.setCodec("audio/pcm");
		fmt.setByteOrder(QAudioFormat::LittleEndian);
		fmt.setSampleType(QAudioFormat::UnSignedInt);
		mux.lock();
		output = new QAudioOutput(fmt);
		io = output->start(); //开始播放
		mux.unlock();
		if (io) return true;
		return false;
	};

	virtual long long GetNoPlayMs() {
		mux.lock();
		if (!output) {
			mux.unlock();
			return 0;
		}
		long long pts = 0;
		double size = output->bufferSize() - output->bytesFree();

		//一秒音频的字节大小
		double secSize = sampleRate * (sampleSize / 8) * channels;
		if (secSize <= 0) {
			pts = 0;

		}
		else {

			pts = (size / secSize) * 1000;
		}
		mux.unlock();
		return pts;
	}
	virtual void Clear() {
		mux.lock();
		if (io) {
			io->reset();
		}
		mux.unlock();
	
	}
	virtual void Close() {
		mux.lock();
		if (io) {

			io->close();
			io = NULL;
		}
		if (output) {
			output->stop();
			delete output;
			output = 0;
		}

		mux.unlock();
	};

	void SetPause(bool isPause)
	{
		mux.lock();
		if (!output) {
			mux.unlock();
			return;
		}
		if (isPause) {
			output->suspend();
		}
		else {
			output->resume();
		}

		mux.unlock();
	}
	//播放音频
	virtual bool Write(const unsigned char* data, int datasize)
	{
		if (!data || datasize <= 0) return false;
		mux.lock();
		if (!output || !io) {

			mux.unlock();
			return false;
		}
		int size = io->write((char*)data, datasize);
		mux.unlock();
		if (datasize != size)
			return false;
		return true;
	};
	//判断是否有足够的空间来写入音频信息
	virtual int GetFree()
	{
		mux.lock();
		if (!output) {

			mux.unlock();
			return 0;
		}
		int free = output->bytesFree();
		mux.unlock();
		return free;

	};
};


//播放的话只有一个对象
XAudioPlay* XAudioPlay::Get()
{
	static CXAudioPlay play;
	return &play;
};

XAudioPlay::XAudioPlay()
{
};
XAudioPlay::~XAudioPlay()
{
};