/// <summary>
/// 如果播放正在进行，则停止播放声音。
/// </summary>
public void Stop()
{
m_Paused = false;
m_IsPlaying = false;
if (m_DeviceID != 0)
{
MCI_GENERIC_PARMS gp = new MCI_GENERIC_PARMS();
gp.dwCallback = IntPtr.Zero;
IntPtr gpPointer = Marshal.AllocHGlobal(Marshal.SizeOf(gp));
try
{
Marshal.StructureToPtr(gp, gpPointer, false);
UInt32 errorCode = mciSendCommand(m_DeviceID, (UInt32)MCI_Command.MCI_STOP, (UInt32)MCI_OpenFlags.MCI_WAIT, gpPointer);
CheckError(errorCode);
m_IsPlaying = false;
}
finally
{
Marshal.FreeHGlobal(gpPointer);
}
Close();
}
}
/// <summary>
/// 暂停音频播放
/// </summary>
public void Pause()
{
if (m_DeviceID != 0)
{
MCI_GENERIC_PARMS gp = new MCI_GENERIC_PARMS();
gp.dwCallback = IntPtr.Zero;
IntPtr gpPointer = Marshal.AllocHGlobal(Marshal.SizeOf(gp));
try
{
Marshal.StructureToPtr(gp, gpPointer, false);
UInt32 errorCode = mciSendCommand(m_DeviceID, (UInt32)MCI_Command.MCI_PAUSE, (UInt32)MCI_OpenFlags.MCI_WAIT, gpPointer);
CheckError(errorCode);
m_Paused = true;
}
finally
{
Marshal.FreeHGlobal(gpPointer);
}
}
else
{
throw new InvalidOperationException("Sound device has already closed.");
}
}
/// <summary>
/// 播放快进（每次快进 FramesStep）
/// </summary>
public void Forward()
{
int err = 0;
StringBuilder buf = new StringBuilder(1000);
TimeFormat tf = timeFormat;
if (deviceID > 0)
{
if ((devCaps & DevCaps.CanShowVideo) == DevCaps.CanShowVideo)
{
if (GetLength() - GetPosition() <= framesStep)
{
MCI_GENERIC_PARMS gen = new MCI_GENERIC_PARMS();
Pause();
err = mciSendCommandA(deviceID, MCI_SEEK, MCI_SEEK_TO_END | MCI_WAIT, ref gen);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException(buf.ToString());
}
Play();
}
else
{
MCI_DGV_STEP_PARMS step = new MCI_DGV_STEP_PARMS();
Pause();
if (timeFormat != TimeFormat.Frames)
{
timeFormat = TimeFormat.Frames;
MciSet(0, MCI_FORMAT_FRAMES, MCI_SET_TIME_FORMAT);
}
step.dwFrames = framesStep;
err = mciSendCommandA(deviceID, MCI_STEP, MCI_WAIT | MCI_DGV_STEP_FRAMES, ref step);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException(buf.ToString());
}
if (tf != TimeFormat.Frames)
{
timeFormat = tf;
MciSet(0, (int)tf, MCI_SET_TIME_FORMAT);
}
Play();
}
}
else
{
if (timeFormat != TimeFormat.MilliSeconds)
{
timeFormat = TimeFormat.MilliSeconds;
MciSet(0, MCI_FORMAT_MILLISECONDS, MCI_SET_TIME_FORMAT);
}
SeekToAny(GetPosition() + framesStep);
if (tf != TimeFormat.MilliSeconds)
{
timeFormat = tf;
MciSet(0, (int)tf, MCI_SET_TIME_FORMAT);
}
}
}
}
/// <summary>
/// 关闭当前播放文件。
/// </summary>
public void Close()
{
int err;
StringBuilder buf = new StringBuilder(1000);
if (deviceID > 0)
{
Stop();
MCI_GENERIC_PARMS gen = new MCI_GENERIC_PARMS();
err = mciSendCommandA(deviceID, MCI_CLOSE, MCI_WAIT, ref gen);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException(buf.ToString());
}
deviceID = 0;
devCaps = DevCaps.None;
size = Size.Empty;
if ((int)timer.Tag == 1)
{
timer.Tag = 0;
timer.Stop();
}
}
}
/// <summary>
/// 停止当前播放文件。
/// </summary>
public void Stop()
{
int err;
StringBuilder buf = new StringBuilder(1000);
if (deviceID > 0 && PlayState == PlayState.Play || PlayState == PlayState.Record)
{
Previous();
MCI_GENERIC_PARMS gen = new MCI_GENERIC_PARMS();
err = mciSendCommandA(deviceID, MCI_STOP, MCI_WAIT, ref gen);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException(buf.ToString());
}
else
{
if ((int)timer.Tag == 1)
{
timer.Tag = 0;
timer.Stop();
}
}
}
}
/// <summary>
/// 继续播放。
/// </summary>
public void Resume()
{
int err;
StringBuilder buf = new StringBuilder(1000);
if (deviceID > 0 && PlayState == PlayState.Pause)
{
MCI_GENERIC_PARMS gen = new MCI_GENERIC_PARMS();
err = mciSendCommandA(deviceID, MCI_RESUME, MCI_WAIT, ref gen);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException(buf.ToString());
}
else
{
if ((int)timer.Tag == 0)
{
timer.Tag = 1;
timer.Start();
}
}
}
}
/// <summary>
/// 使当前播放文件跳到上一首(TMSF)或开始位置。
/// </summary>
public void Previous()
{
int err;
StringBuilder buf = new StringBuilder(1000);
if (deviceID > 0)
{
if (timeFormat == TimeFormat.TMSF)
{
int pos = CurrentTrack;
Pause();
//如果不是第一首，跳到上一首，否则重新开始第一首。
if (pos != 1)
{
StartPos = pos - 1;
}
else
StartPos = pos;
Play();
}
else
{
MCI_GENERIC_PARMS gen = new MCI_GENERIC_PARMS();
Pause();
err = mciSendCommandA(deviceID, MCI_SEEK, MCI_SEEK_TO_START | MCI_WAIT, ref gen);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException(buf.ToString());
}
Play();
}
}
}
/// <summary>
/// 使当前播放文件跳到下一首(TMSF)或最后。
/// </summary>
public void Next()
{
int err;
StringBuilder buf = new StringBuilder(1000);
if (deviceID > 0)
{
if (timeFormat == TimeFormat.TMSF)
{
Pause();
int pos = CurrentTrack;
int tracks = Tracks;
//如果是最后一首，重新开始最后一首，否则下一首。
if (pos == tracks)
{
StartPos = tracks;
}
else
{
StartPos = pos + 1;
}
Play();
}
else
{
MCI_GENERIC_PARMS gen = new MCI_GENERIC_PARMS();
Pause();
err = mciSendCommandA(deviceID, MCI_SEEK, MCI_SEEK_TO_END | MCI_WAIT, ref gen);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException(buf.ToString());
}
Play();
}
}
}
private static extern int mciSendCommandGeneric(int wDeviceID, int uMessage, int dwParam1, ref MCI_GENERIC_PARMS dwParam2);
private static extern int mciSendCommandA(
Int32 wDeviceID,
UInt32 uMessage,
Int32 dwParam,
ref MCI_GENERIC_PARMS Any);
