SDL_dibaudio.c
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2012 Sam Lantinga
4
5
This library is free software; you can redistribute it and/or
6
modify it under the terms of the GNU Lesser General Public
7
License as published by the Free Software Foundation; either
8
version 2.1 of the License, or (at your option) any later version.
9
10
11
12
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
Lesser General Public License for more details.
15
16
17
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19
Sam Lantinga
20
slouken@libsdl.org
21
*/
22
#include "SDL_config.h"
23
24
25
/* Allow access to a raw mixing buffer */
26
27
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
28
29
30
#include <mmsystem.h>
#include "SDL_timer.h"
31
#include "SDL_audio.h"
32
#include "../SDL_audio_c.h"
33
#include "SDL_dibaudio.h"
34
35
36
#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
#include "win_ce_semaphore.h"
#endif
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
/* Audio driver functions */
static int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void DIB_ThreadInit(_THIS);
static void DIB_WaitAudio(_THIS);
static Uint8 *DIB_GetAudioBuf(_THIS);
static void DIB_PlayAudio(_THIS);
static void DIB_WaitDone(_THIS);
static void DIB_CloseAudio(_THIS);
/* Audio driver bootstrap functions */
static int Audio_Available(void)
{
return(1);
}
static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
57
58
SDL_free(device->hidden);
SDL_free(device);
59
60
61
62
63
64
65
}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *this;
/* Initialize all variables that we clean on shutdown */
66
this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
67
if ( this ) {
68
SDL_memset(this, 0, (sizeof *this));
69
this->hidden = (struct SDL_PrivateAudioData *)
70
SDL_malloc((sizeof *this->hidden));
71
72
73
74
}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
75
SDL_free(this);
76
77
78
}
return(0);
}
79
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
/* Set the function pointers */
this->OpenAudio = DIB_OpenAudio;
this->ThreadInit = DIB_ThreadInit;
this->WaitAudio = DIB_WaitAudio;
this->PlayAudio = DIB_PlayAudio;
this->GetAudioBuf = DIB_GetAudioBuf;
this->WaitDone = DIB_WaitDone;
this->CloseAudio = DIB_CloseAudio;
this->free = Audio_DeleteDevice;
return this;
}
AudioBootStrap WAVEOUT_bootstrap = {
"waveout", "Win95/98/NT/2000 WaveOut",
Audio_Available, Audio_CreateDevice
};
/* The Win32 callback for filling the WAVE device */
102
static void CALLBACK FillSound(HWAVEOUT hwo, UINT uMsg, DWORD_PTR dwInstance,
103
104
105
106
107
108
109
110
111
DWORD dwParam1, DWORD dwParam2)
{
SDL_AudioDevice *this = (SDL_AudioDevice *)dwInstance;
/* Only service "buffer done playing" messages */
if ( uMsg != WOM_DONE )
return;
/* Signal that we are done playing a buffer */
112
113
114
#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
ReleaseSemaphoreCE(audio_sem, 1, NULL);
#else
115
ReleaseSemaphore(audio_sem, 1, NULL);
117
118
119
120
}
static void SetMMerror(char *function, MMRESULT code)
{
121
size_t len;
122
char errbuf[MAXERRORLENGTH];
123
124
125
#ifdef _WIN32_WCE
wchar_t werrbuf[MAXERRORLENGTH];
#endif
127
128
SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
len = SDL_strlen(errbuf);
129
130
131
132
133
134
#ifdef _WIN32_WCE
/* UNICODE version */
waveOutGetErrorText(code, werrbuf, MAXERRORLENGTH-len);
WideCharToMultiByte(CP_ACP,0,werrbuf,-1,errbuf+len,MAXERRORLENGTH-len,NULL,NULL);
#else
135
waveOutGetErrorText(code, errbuf+len, (UINT)(MAXERRORLENGTH-len));
136
137
138
#endif
SDL_SetError("%s",errbuf);
139
140
141
142
143
144
145
146
147
148
149
}
/* Set high priority for the audio thread */
static void DIB_ThreadInit(_THIS)
{
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_HIGHEST);
}
void DIB_WaitAudio(_THIS)
{
/* Wait for an audio chunk to finish */
150
151
152
#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
WaitForSemaphoreCE(audio_sem, INFINITE);
#else
153
WaitForSingleObject(audio_sem, INFINITE);
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
}
Uint8 *DIB_GetAudioBuf(_THIS)
{
Uint8 *retval;
retval = (Uint8 *)(wavebuf[next_buffer].lpData);
return retval;
}
void DIB_PlayAudio(_THIS)
{
/* Queue it up */
waveOutWrite(sound, &wavebuf[next_buffer], sizeof(wavebuf[0]));
next_buffer = (next_buffer+1)%NUM_BUFFERS;
}
void DIB_WaitDone(_THIS)
{
int i, left;
do {
left = NUM_BUFFERS;
for ( i=0; i<NUM_BUFFERS; ++i ) {
if ( wavebuf[i].dwFlags & WHDR_DONE ) {
--left;
}
}
if ( left > 0 ) {
SDL_Delay(100);
}
} while ( left > 0 );
}
void DIB_CloseAudio(_THIS)
{
int i;
/* Close up audio */
if ( audio_sem ) {
195
196
197
#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
CloseSynchHandle(audio_sem);
#else
198
CloseHandle(audio_sem);
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
}
if ( sound ) {
waveOutClose(sound);
}
/* Clean up mixing buffers */
for ( i=0; i<NUM_BUFFERS; ++i ) {
if ( wavebuf[i].dwUser != 0xFFFF ) {
waveOutUnprepareHeader(sound, &wavebuf[i],
sizeof(wavebuf[i]));
wavebuf[i].dwUser = 0xFFFF;
}
}
/* Free raw mixing buffer */
if ( mixbuf != NULL ) {
215
SDL_free(mixbuf);
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
mixbuf = NULL;
}
}
int DIB_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
MMRESULT result;
int i;
WAVEFORMATEX waveformat;
/* Initialize the wavebuf structures for closing */
sound = NULL;
audio_sem = NULL;
for ( i = 0; i < NUM_BUFFERS; ++i )
wavebuf[i].dwUser = 0xFFFF;
mixbuf = NULL;
/* Set basic WAVE format parameters */
234
SDL_memset(&waveformat, 0, sizeof(waveformat));
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
waveformat.wFormatTag = WAVE_FORMAT_PCM;
/* Determine the audio parameters from the AudioSpec */
switch ( spec->format & 0xFF ) {
case 8:
/* Unsigned 8 bit audio data */
spec->format = AUDIO_U8;
waveformat.wBitsPerSample = 8;
break;
case 16:
/* Signed 16 bit audio data */
spec->format = AUDIO_S16;
waveformat.wBitsPerSample = 16;
break;
default:
SDL_SetError("Unsupported audio format");
return(-1);
}
waveformat.nChannels = spec->channels;
waveformat.nSamplesPerSec = spec->freq;
waveformat.nBlockAlign =
waveformat.nChannels * (waveformat.wBitsPerSample/8);
waveformat.nAvgBytesPerSec =
waveformat.nSamplesPerSec * waveformat.nBlockAlign;
/* Check the buffer size -- minimum of 1/4 second (word aligned) */
if ( spec->samples < (spec->freq/4) )
spec->samples = ((spec->freq/4)+3)&~3;
/* Update the fragment size as size in bytes */
SDL_CalculateAudioSpec(spec);
/* Open the audio device */
result = waveOutOpen(&sound, WAVE_MAPPER, &waveformat,
269
(DWORD_PTR)FillSound, (DWORD_PTR)this, CALLBACK_FUNCTION);
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
if ( result != MMSYSERR_NOERROR ) {
SetMMerror("waveOutOpen()", result);
return(-1);
}
#ifdef SOUND_DEBUG
/* Check the sound device we retrieved */
{
WAVEOUTCAPS caps;
result = waveOutGetDevCaps((UINT)sound, &caps, sizeof(caps));
if ( result != MMSYSERR_NOERROR ) {
SetMMerror("waveOutGetDevCaps()", result);
return(-1);
}
printf("Audio device: %s\n", caps.szPname);
}
#endif
/* Create the audio buffer semaphore */
290
291
292
#if defined(_WIN32_WCE) && (_WIN32_WCE < 300)
audio_sem = CreateSemaphoreCE(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);
#else
293
audio_sem = CreateSemaphore(NULL, NUM_BUFFERS-1, NUM_BUFFERS, NULL);
295
296
297
298
299
300
if ( audio_sem == NULL ) {
SDL_SetError("Couldn't create semaphore");
return(-1);
}
/* Create the sound buffers */
301
mixbuf = (Uint8 *)SDL_malloc(NUM_BUFFERS*spec->size);
302
303
304
305
306
if ( mixbuf == NULL ) {
SDL_SetError("Out of memory");
return(-1);
}
for ( i = 0; i < NUM_BUFFERS; ++i ) {
307
SDL_memset(&wavebuf[i], 0, sizeof(wavebuf[i]));
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
wavebuf[i].lpData = (LPSTR) &mixbuf[i*spec->size];
wavebuf[i].dwBufferLength = spec->size;
wavebuf[i].dwFlags = WHDR_DONE;
result = waveOutPrepareHeader(sound, &wavebuf[i],
sizeof(wavebuf[i]));
if ( result != MMSYSERR_NOERROR ) {
SetMMerror("waveOutPrepareHeader()", result);
return(-1);
}
}
/* Ready to go! */
next_buffer = 0;
return(0);
}