1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
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 */
|