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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
/**
* @file drivers/audio/Win32/gaudin_lld.c
* @brief GAUDIN - Driver file for Win32.
*/
#include "gfx.h"
#if GFX_USE_GAUDIN
/* Include the driver defines */
#include "src/gaudin/driver.h"
#undef Red
#undef Green
#undef Blue
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <stdio.h>
#include <mmsystem.h>
static HWAVEIN ah;
static volatile int nQueuedBuffers;
static bool_t isClosing;
static WAVEHDR *pWaveHdrs;
static HANDLE waveThread;
static DWORD threadID;
/*
static void PrintWaveErrorMsg(DWORD err, TCHAR * str)
{
#define BUFFERSIZE 128
char buffer[BUFFERSIZE];
fprintf(stderr, "GAUDIN: ERROR 0x%08X: %s\r\n", err, str);
if (mciGetErrorString(err, &buffer[0], sizeof(buffer)))
fprintf(stderr, "%s\r\n", &buffer[0]);
else
fprintf(stderr, "0x%08X returned!\r\n", err);
}
*/
/**************************** waveProc() *******************************
* We don't use CALLBACK_FUNCTION because it is restricted to calling only
* a few particular Windows functions, namely some of the time functions,
* and a few of the Low Level MIDI API. If you violate this rule, your app can
* hang inside of the callback). One of the Windows API that a callback can't
* call is waveInAddBuffer() which is what we need to use whenever we receive a
* MM_WIM_DATA. My callback would need to defer that job to another thread
* anyway, so instead just use CALLBACK_THREAD here instead.
*************************************************************************/
static DWORD WINAPI waveProc(LPVOID arg) {
MSG msg;
(void) arg;
while (GetMessage(&msg, 0, 0, 0)) {
switch (msg.message) {
case MM_WIM_DATA:
GAUDIN_ISR_CompleteI((audin_sample_t *)((WAVEHDR *)msg.lParam)->lpData, ((WAVEHDR *)msg.lParam)->dwBytesRecorded/sizeof(audin_sample_t));
/* Are we closing? */
if (isClosing) {
/* Yes. We aren't recording, so another WAVEHDR has been returned to us after recording has stopped.
* When we get all of them back, things can be cleaned up
*/
nQueuedBuffers--;
waveInUnprepareHeader(ah, (WAVEHDR *)msg.lParam, sizeof(WAVEHDR));
} else {
/* No. Now we need to requeue this buffer so the driver can use it for another block of audio
* data. NOTE: We shouldn't need to waveInPrepareHeader() a WAVEHDR that has already been prepared once.
* Note: We are assuming here that both the application can still access the buffer while
* it is on the queue.
*/
waveInAddBuffer(ah, (WAVEHDR *)msg.lParam, sizeof(WAVEHDR));
}
break;
}
}
return 0;
}
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
void gaudin_lld_deinit(void) {
if (ah) {
isClosing = TRUE;
waveInReset(ah);
while(nQueuedBuffers) Sleep(1);
waveInClose(ah);
ah = 0;
if (pWaveHdrs) gfxFree(pWaveHdrs);
pWaveHdrs = 0;
isClosing = FALSE;
}
}
void gaudin_lld_init(const gaudin_params *paud) {
WAVEFORMATEX wfx;
size_t spaceleft;
audin_sample_t *p;
WAVEHDR *phdr;
size_t nBuffers;
size_t sz;
if (!waveThread) {
if (!(waveThread = CreateThread(0, 0, (LPTHREAD_START_ROUTINE)waveProc, 0, 0, &threadID))) {
fprintf(stderr, "GAUDIN/GAUDOUT: Can't create WAVE recording thread\n");
return;
}
CloseHandle(waveThread);
}
gaudin_lld_deinit();
wfx.wFormatTag = WAVE_FORMAT_PCM;
wfx.nChannels = paud->channel == GAUDIN_STEREO ? 2 : 1;
wfx.nSamplesPerSec = paud->frequency;
wfx.nBlockAlign = wfx.nChannels * sizeof(audin_sample_t);
wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign;
wfx.wBitsPerSample = sizeof(audin_sample_t) * 8;
wfx.cbSize = 0;
if (waveInOpen(&ah, WAVE_MAPPER, &wfx, (DWORD_PTR)threadID, (DWORD_PTR)paud, CALLBACK_THREAD)) {
fprintf(stderr, "GAUDIN: Can't open WAVE recording device\n");
return;
}
/* We need to allocate a wave header for each buffer */
nBuffers = (paud->bufcount + paud->samplesPerEvent - 1) / paud->samplesPerEvent;
if (!(pWaveHdrs = gfxAlloc(nBuffers * sizeof(WAVEHDR)))) {
fprintf(stderr, "GAUDIN: Buffer header allocation failed\n");
return;
}
/* Prepare each buffer and send to the wavein device */
spaceleft = paud->bufcount;
for(p = paud->buffer, phdr = pWaveHdrs, spaceleft = paud->bufcount; spaceleft; p += sz, phdr++, spaceleft -= sz) {
sz = spaceleft > paud->samplesPerEvent ? paud->samplesPerEvent : spaceleft;
phdr->dwBufferLength = sz * sizeof(audin_sample_t);
phdr->lpData = (LPSTR)p;
phdr->dwFlags = 0;
if (!waveInPrepareHeader(ah, phdr, sizeof(WAVEHDR))
&& !waveInAddBuffer(ah, phdr, sizeof(WAVEHDR)))
nQueuedBuffers++;
else
fprintf(stderr, "GAUDIN: Buffer prepare failed\n");
}
if (!nQueuedBuffers)
fprintf(stderr, "GAUDIN: Failed to prepare any buffers\n");
}
void gaudin_lld_start(void) {
waveInStart(ah);
}
void gaudin_lld_stop(void) {
waveInStop(ah);
}
#endif /* GFX_USE_GAUDIN */
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