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
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
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
|
/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2004 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
/* Tru64 UNIX MME support */
#include <mme_api.h>
#include "SDL_timer.h"
#include "SDL_audio.h"
#include "../SDL_audio_c.h"
#include "SDL_mmeaudio.h"
static BOOL inUse[NUM_BUFFERS];
/* Audio driver functions */
static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void MME_WaitAudio(_THIS);
static Uint8 *MME_GetAudioBuf(_THIS);
static void MME_PlayAudio(_THIS);
static void MME_WaitDone(_THIS);
static void MME_CloseAudio(_THIS);
/* Audio driver bootstrap functions */
static int Audio_Available(void)
{
return(1);
}
static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
if ( device ) {
if ( device->hidden ) {
SDL_free(device->hidden);
device->hidden = NULL;
}
SDL_free(device);
device = NULL;
}
}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *this;
/* Initialize all variables that we clean on shutdown */
this = SDL_malloc(sizeof(SDL_AudioDevice));
if ( this ) {
SDL_memset(this, 0, (sizeof *this));
this->hidden = SDL_malloc((sizeof *this->hidden));
}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
SDL_free(this);
}
return(0);
}
SDL_memset(this->hidden, 0, (sizeof *this->hidden));
/* Set the function pointers */
this->OpenAudio = MME_OpenAudio;
this->WaitAudio = MME_WaitAudio;
this->PlayAudio = MME_PlayAudio;
this->GetAudioBuf = MME_GetAudioBuf;
this->WaitDone = MME_WaitDone;
this->CloseAudio = MME_CloseAudio;
this->free = Audio_DeleteDevice;
return this;
}
AudioBootStrap MMEAUDIO_bootstrap = {
"waveout", "Tru64 MME WaveOut",
Audio_Available, Audio_CreateDevice
};
static void SetMMerror(char *function, MMRESULT code)
{
int len;
char errbuf[MAXERRORLENGTH];
SDL_snprintf(errbuf, SDL_arraysize(errbuf), "%s: ", function);
len = SDL_strlen(errbuf);
waveOutGetErrorText(code, errbuf+len, MAXERRORLENGTH-len);
SDL_SetError("%s",errbuf);
}
static void CALLBACK MME_CALLBACK(HWAVEOUT hwo,
UINT uMsg,
DWORD dwInstance,
LPARAM dwParam1,
LPARAM dwParam2)
{
WAVEHDR *wp = (WAVEHDR *) dwParam1;
if ( uMsg == WOM_DONE )
inUse[wp->dwUser] = FALSE;
}
static int MME_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
MMRESULT result;
int i;
mixbuf = NULL;
/* Set basic WAVE format parameters */
shm = mmeAllocMem(sizeof(*shm));
if ( shm == NULL ) {
SDL_SetError("Out of memory: shm");
return(-1);
}
shm->sound = 0;
shm->wFmt.wf.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;
shm->wFmt.wBitsPerSample = 8;
break;
case 16:
/* Signed 16 bit audio data */
spec->format = AUDIO_S16;
shm->wFmt.wBitsPerSample = 16;
break;
default:
SDL_SetError("Unsupported audio format");
return(-1);
}
shm->wFmt.wf.nChannels = spec->channels;
shm->wFmt.wf.nSamplesPerSec = spec->freq;
shm->wFmt.wf.nBlockAlign =
shm->wFmt.wf.nChannels * shm->wFmt.wBitsPerSample / 8;
shm->wFmt.wf.nAvgBytesPerSec =
shm->wFmt.wf.nSamplesPerSec * shm->wFmt.wf.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(&(shm->sound),
WAVE_MAPPER,
&(shm->wFmt.wf),
MME_CALLBACK,
NULL,
(CALLBACK_FUNCTION|WAVE_OPEN_SHAREABLE));
if ( result != MMSYSERR_NOERROR ) {
SetMMerror("waveOutOpen()", result);
return(-1);
}
/* Create the sound buffers */
mixbuf = (Uint8 *)mmeAllocBuffer(NUM_BUFFERS * (spec->size));
if ( mixbuf == NULL ) {
SDL_SetError("Out of memory: mixbuf");
return(-1);
}
for (i = 0; i < NUM_BUFFERS; i++) {
shm->wHdr[i].lpData = &mixbuf[i * (spec->size)];
shm->wHdr[i].dwBufferLength = spec->size;
shm->wHdr[i].dwFlags = 0;
shm->wHdr[i].dwUser = i;
shm->wHdr[i].dwLoops = 0; /* loop control counter */
shm->wHdr[i].lpNext = NULL; /* reserved for driver */
shm->wHdr[i].reserved = 0;
inUse[i] = FALSE;
}
next_buffer = 0;
return 0;
}
static void MME_WaitAudio(_THIS)
{
while ( inUse[next_buffer] ) {
mmeWaitForCallbacks();
mmeProcessCallbacks();
}
}
static Uint8 *MME_GetAudioBuf(_THIS)
{
Uint8 *retval;
inUse[next_buffer] = TRUE;
retval = (Uint8 *)(shm->wHdr[next_buffer].lpData);
return retval;
}
static void MME_PlayAudio(_THIS)
{
/* Queue it up */
waveOutWrite(shm->sound, &(shm->wHdr[next_buffer]), sizeof(WAVEHDR));
next_buffer = (next_buffer+1)%NUM_BUFFERS;
}
static void MME_WaitDone(_THIS)
{
MMRESULT result;
int i;
if ( shm->sound ) {
for (i = 0; i < NUM_BUFFERS; i++)
while ( inUse[i] ) {
mmeWaitForCallbacks();
mmeProcessCallbacks();
}
result = waveOutReset(shm->sound);
if ( result != MMSYSERR_NOERROR )
SetMMerror("waveOutReset()", result);
mmeProcessCallbacks();
}
}
static void MME_CloseAudio(_THIS)
{
MMRESULT result;
if ( mixbuf ) {
result = mmeFreeBuffer(mixbuf);
if (result != MMSYSERR_NOERROR )
SetMMerror("mmeFreeBuffer", result);
mixbuf = NULL;
}
if ( shm ) {
if ( shm->sound ) {
result = waveOutClose(shm->sound);
if (result != MMSYSERR_NOERROR )
SetMMerror("waveOutClose()", result);
mmeProcessCallbacks();
}
result = mmeFreeMem(shm);
if (result != MMSYSERR_NOERROR )
SetMMerror("mmeFreeMem()", result);
shm = NULL;
}
}
|
