1'st

Init() { ... output[i].event_handle = CreateEvent(0, FALSE /* manual reset */, FALSE /* initial state */, 0); ----->the event object initial state is FALSE,--nonsignaled. .. } After this ,the event_handle is nonsignaled state. ~~~~~~~~~~~~

but in function:

int wait(struct buffer *buffer) { MMRESULT error; DWORD tick;

if (!buffer->playing) return 0;

switch (WaitForSingleObject(buffer->event_handle, INFINITE)) { .. }

why the event_handle is signaled state?

I only find this time to setevent: void CALLBACK callback(HWAVEOUT handle, UINT message, DWORD data, DWORD param1, DWORD param2) { WAVEHDR *header; struct buffer *buffer;

switch (message) { case WOM_DONE: header = (WAVEHDR *) param1; buffer = (struct buffer *) header->dwUser; if (SetEvent(buffer->event_handle) == 0) { ... } case WOM_OPEN: case WOM_CLOSE: -----> nothing to do in this. break; }

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Message: 2 Date: Fri, 19 Aug 2005 11:39:24 -0700 From: Rob Leslie rob@mars.org Subject: Re: [mad-dev] [madplay]:audio_win32.c::struct buffer.event_handle: Can not find the time that sets the event object to the signaled state To: mad-dev@lists.mars.org Message-ID: DE968453-D275-4D13-9D99-F285590788C2@mars.org Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed

On Aug 18, 2005, at 10:26 PM, cnmmd wrote:

why the event_handle is signaled state?

I only find this time to setevent: void CALLBACK callback(HWAVEOUT handle, UINT message, DWORD data, DWORD param1, DWORD param2) { WAVEHDR *header; struct buffer *buffer;

switch (message) { case WOM_DONE: header = (WAVEHDR *) param1; buffer = (struct buffer *) header->dwUser; if (SetEvent(buffer->event_handle) == 0) {

... }

That's it. This callback routine is passed to waveOutOpen(), which allows it to be called asynchronously after each data block sent via waveOutWrite() has finished playing.

-------->yes, This callback routine will to be called after each data block sent via

[waveOutWrite()] has finished playing. but after waveOutOpen(),the callback do nothing.the event object is nonsignaled also.