diff options
Diffstat (limited to 'drivers/audio/Win32/gaudin_lld.c')
| -rw-r--r-- | drivers/audio/Win32/gaudin_lld.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/audio/Win32/gaudin_lld.c b/drivers/audio/Win32/gaudin_lld.c new file mode 100644 index 00000000..2c8431cf --- /dev/null +++ b/drivers/audio/Win32/gaudin_lld.c @@ -0,0 +1,170 @@ +/* + * 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 */ |