///////////////////////////////////////////////////////// FileName:	audio_play_thread.cpp// Author:		b1gm0use// Project:		myaudio#include <iostream>#include <unistd.h>#include <sys/ioctl.h>#include <linux/soundcard.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <qsemaphore.h>#include "audio_play_thread.h"#include "audio_player.h"#include "audio.h"#include "common.h"#include "network.h"#include "avi.h"using namespace std;///////////////////////////////////////////////////////// Public Functions///////////////////////////////////////////////////////// 構造函數// 傳入參數為// ap_in 上層AudioPlayer對象指針// img 圖像參數// msg_in 為一個字符串類型的參數，用于傳遞IP或設備名// type_in AudioPlayer類型// stackSize QThread所用的參數audio_play_thread::audio_play_thread ( avi * avi_ptr_in, 		AudioPlayer * ap_in, unsigned int stackSize )		:QThread( stackSize ) // {{{{	verbose_output( 2, "create audio_play_thread." );	ap = ap_in;	fd_w = 0;	frame = 0;	avi_ptr = avi_ptr_in;} // }}}void audio_play_thread::init( void ) // {{{{		verbose_output( 2, "init audio_play_thread." );	int arg = 0;	int status = 0;	// 打開回放	fd_w = open( avi_ptr->audio_dev, O_WRONLY);	if (fd_w < 0) 	{		cerr << "open device [" << avi_ptr->audio_dev << "] failed." << endl;		::exit(1);	}	// 設置采樣時的量化位數 	arg = SIZE;	status = ioctl(fd_w, SOUND_PCM_WRITE_BITS, &arg);	if (status == -1)	{		cerr << "SOUND_PCM_WRITE_BITS ioctl failed" << endl;;		::exit( 1 );	}	if (arg != SIZE)	{		cerr << "Warning! unable to set sample size" << endl;;	}	verbose_output( 2, "use sample size: ", arg );	// 設置采樣時的聲道數目 	arg = CHANNELS; 	status = ioctl(fd_w, SOUND_PCM_WRITE_CHANNELS, &arg);	if (status == -1)	{		cerr << "SOUND_PCM_WRITE_CHANNELS ioctl failed" << endl;;		::exit( 1 );	}	if (arg != CHANNELS)	{		cerr << "Warning! unable to set number of channels" << endl;;	}	verbose_output( 2, "use audio channels: ", arg );	// 設置采樣時的采樣頻率 	arg = RATE;	status = ioctl(fd_w, SOUND_PCM_WRITE_RATE, &arg);	if (status == -1)	{		cerr << "SOUND_PCM_WRITE_WRITE ioctl failed" << endl;;		::exit( 1 );	}	if (arg != RATE )	{		cerr << "Warning! unable to set sample rate" << endl;;	}		verbose_output( 2, "use sample rate: ", arg );} // }}}// 運行部分，線程代碼在這里void audio_play_thread::run ( void ) // {{{{	int status = 0;		verbose_output( 2, "audio_play_thread begin running." );	//(*(avi_ptr->audio_can_play_semaphore))++;	while ( 1 )	{			ap->ready_to_play_audio->wait();		verbose_output( 4, "Playing...lock frame No.", frame );		(*(avi_ptr->snd_buff_semaphore[frame]))++;		//回放		status = write( fd_w, avi_ptr->snd_buff[frame], BUFF_SIZE * LENGTH );		if ( status == -1 )		{			cerr << "Write to device error." << endl;			::exit( 1 );		}		verbose_output( 4, "Playing...unlock frame No.", frame );		(*(avi_ptr->snd_buff_semaphore[frame]))--;		// 等待回放結束		//status = ioctl( fd_w, SOUND_PCM_SYNC, 0 ); 				if ( status == -1 )		{			  cerr << "SOUND_PCM_SYNC ioctl failed" << endl;			  ::exit( 1 );		}		frame++;		frame %= 3;	}	return;	} // }}}