/
SDL_ahiaudio.c
338 lines (269 loc) · 8.19 KB
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2006 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.
14
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
*/
23
24
/* Allow access to a raw mixing buffer (for AmigaOS) */
25
26
27
28
#include "SDL_endian.h"
#include "SDL_audio.h"
#include "SDL_audiomem.h"
#include "SDL_audio_c.h"
29
#include "SDL_ahiaudio.h"
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
/* Audio driver functions */
static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec);
static void AHI_WaitAudio(_THIS);
static void AHI_PlayAudio(_THIS);
static Uint8 *AHI_GetAudioBuf(_THIS);
static void AHI_CloseAudio(_THIS);
#ifndef __SASC
#define mymalloc(x) AllocVec(x,MEMF_PUBLIC)
#define myfree FreeVec
#else
#define mymalloc malloc
#define myfree free
#endif
/* Audio driver bootstrap functions */
static int Audio_Available(void)
{
50
51
52
53
54
55
56
57
58
int ok=0;
struct MsgPort *p;
struct AHIRequest *req;
if(p=CreateMsgPort())
{
if(req=(struct AHIRequest *)CreateIORequest(p,sizeof(struct AHIRequest)))
{
req->ahir_Version=4;
59
60
61
62
63
64
65
66
67
68
69
70
71
72
if(!OpenDevice(AHINAME,0,(struct IORequest *)req,NULL))
{
D(bug("AHI available.\n"));
ok=1;
CloseDevice((struct IORequest *)req);
}
DeleteIORequest((struct IORequest *)req);
}
DeleteMsgPort(p);
}
D(if(!ok) bug("AHI not available\n"));
return ok;
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
}
static void Audio_DeleteDevice(SDL_AudioDevice *device)
{
free(device->hidden);
free(device);
}
static SDL_AudioDevice *Audio_CreateDevice(int devindex)
{
SDL_AudioDevice *this;
#ifndef NO_AMIGADEBUG
D(bug("AHI created...\n"));
#endif
/* Initialize all variables that we clean on shutdown */
this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
if ( this ) {
memset(this, 0, (sizeof *this));
this->hidden = (struct SDL_PrivateAudioData *)
malloc((sizeof *this->hidden));
}
if ( (this == NULL) || (this->hidden == NULL) ) {
SDL_OutOfMemory();
if ( this ) {
free(this);
}
return(0);
}
memset(this->hidden, 0, (sizeof *this->hidden));
/* Set the function pointers */
this->OpenAudio = AHI_OpenAudio;
this->WaitAudio = AHI_WaitAudio;
this->PlayAudio = AHI_PlayAudio;
this->GetAudioBuf = AHI_GetAudioBuf;
this->CloseAudio = AHI_CloseAudio;
this->free = Audio_DeleteDevice;
return this;
}
AudioBootStrap AHI_bootstrap = {
"AHI", Audio_Available, Audio_CreateDevice
};
void static AHI_WaitAudio(_THIS)
{
if(!CheckIO((struct IORequest *)audio_req[current_buffer]))
{
WaitIO((struct IORequest *)audio_req[current_buffer]);
// AbortIO((struct IORequest *)audio_req[current_buffer]);
}
}
static void AHI_PlayAudio(_THIS)
{
if(playing>1)
WaitIO((struct IORequest *)audio_req[current_buffer]);
/* Write the audio data out */
audio_req[current_buffer] -> ahir_Std. io_Message.mn_Node.ln_Pri = 60;
audio_req[current_buffer] -> ahir_Std. io_Data = mixbuf[current_buffer];
139
audio_req[current_buffer] -> ahir_Std. io_Length = this->hidden->size;
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
audio_req[current_buffer] -> ahir_Std. io_Offset = 0;
audio_req[current_buffer] -> ahir_Std . io_Command = CMD_WRITE;
audio_req[current_buffer] -> ahir_Frequency = this->hidden->freq;
audio_req[current_buffer] -> ahir_Volume = 0x10000;
audio_req[current_buffer] -> ahir_Type = this->hidden->type;
audio_req[current_buffer] -> ahir_Position = 0x8000;
audio_req[current_buffer] -> ahir_Link = (playing>0 ? audio_req[current_buffer^1] : NULL);
SendIO((struct IORequest *)audio_req[current_buffer]);
current_buffer^=1;
playing++;
}
static Uint8 *AHI_GetAudioBuf(_THIS)
{
return(mixbuf[current_buffer]);
}
static void AHI_CloseAudio(_THIS)
{
D(bug("Closing audio...\n"));
playing=0;
if(audio_req[0])
{
if(audio_req[1])
{
169
170
171
172
D(bug("Break req[1]...\n"));
AbortIO((struct IORequest *)audio_req[1]);
WaitIO((struct IORequest *)audio_req[1]);
173
174
}
175
176
177
178
179
180
D(bug("Break req[0]...\n"));
AbortIO((struct IORequest *)audio_req[0]);
WaitIO((struct IORequest *)audio_req[0]);
if(audio_req[1])
181
{
182
183
184
D(bug("Break AGAIN req[1]...\n"));
AbortIO((struct IORequest *)audio_req[1]);
WaitIO((struct IORequest *)audio_req[1]);
185
}
186
187
188
// Double abort to be sure to break the dbuffering process.
SDL_Delay(200);
189
190
D(bug("Reqs breaked, closing device...\n"));
191
CloseDevice((struct IORequest *)audio_req[0]);
192
193
194
D(bug("Device closed, freeing memory...\n"));
myfree(audio_req[1]);
D(bug("Memory freed, deleting IOReq...\n"));
195
196
197
198
DeleteIORequest((struct IORequest *)audio_req[0]);
audio_req[0]=audio_req[1]=NULL;
}
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
D(bug("Freeing mixbuf[0]...\n"));
if ( mixbuf[0] != NULL ) {
myfree(mixbuf[0]);
// SDL_FreeAudioMem(mixbuf[0]);
mixbuf[0] = NULL;
}
D(bug("Freeing mixbuf[1]...\n"));
if ( mixbuf[1] != NULL ) {
myfree(mixbuf[1]);
// SDL_FreeAudioMem(mixbuf[1]);
mixbuf[1] = NULL;
}
D(bug("Freeing audio_port...\n"));
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
if ( audio_port != NULL ) {
DeleteMsgPort(audio_port);
audio_port = NULL;
}
D(bug("...done!\n"));
}
static int AHI_OpenAudio(_THIS, SDL_AudioSpec *spec)
{
// int width;
D(bug("AHI opening...\n"));
/* Determine the audio parameters from the AudioSpec */
switch ( spec->format & 0xFF ) {
case 8: { /* Signed 8 bit audio data */
D(bug("Samples a 8 bit...\n"));
spec->format = AUDIO_S8;
this->hidden->bytespersample=1;
235
236
237
238
if(spec->channels<2)
this->hidden->type = AHIST_M8S;
else
this->hidden->type = AHIST_S8S;
239
240
241
242
243
244
245
}
break;
case 16: { /* Signed 16 bit audio data */
D(bug("Samples a 16 bit...\n"));
spec->format = AUDIO_S16MSB;
this->hidden->bytespersample=2;
246
247
248
249
if(spec->channels<2)
this->hidden->type = AHIST_M16S;
else
this->hidden->type = AHIST_S16S;
250
251
252
253
254
255
256
257
258
}
break;
default: {
SDL_SetError("Unsupported audio format");
return(-1);
}
}
259
260
261
262
263
264
265
if(spec->channels!=1 && spec->channels!=2)
{
D(bug("Wrong channel number!\n"));
SDL_SetError("Channel number non supported");
return -1;
}
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
D(bug("Before CalculateAudioSpec\n"));
/* Update the fragment size as size in bytes */
SDL_CalculateAudioSpec(spec);
D(bug("Before CreateMsgPort\n"));
if(!(audio_port=CreateMsgPort()))
{
SDL_SetError("Unable to create a MsgPort");
return -1;
}
D(bug("Before CreateIORequest\n"));
if(!(audio_req[0]=(struct AHIRequest *)CreateIORequest(audio_port,sizeof(struct AHIRequest))))
{
SDL_SetError("Unable to create an AHIRequest");
DeleteMsgPort(audio_port);
return -1;
}
audio_req[0]->ahir_Version = 4;
if(OpenDevice(AHINAME,0,(struct IORequest *)audio_req[0],NULL))
{
SDL_SetError("Unable to open AHI device!\n");
DeleteIORequest((struct IORequest *)audio_req[0]);
DeleteMsgPort(audio_port);
return -1;
}
D(bug("AFTER opendevice\n"));
299
/* Set output frequency and size */
300
this->hidden->freq = spec->freq;
301
this->hidden->size = spec->size;
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
D(bug("Before buffer allocation\n"));
/* Allocate mixing buffer */
mixbuf[0] = (Uint8 *)mymalloc(spec->size);
mixbuf[1] = (Uint8 *)mymalloc(spec->size);
D(bug("Before audio_req allocation\n"));
if(!(audio_req[1]=mymalloc(sizeof(struct AHIRequest))))
{
SDL_OutOfMemory();
return(-1);
}
D(bug("Before audio_req memcpy\n"));
memcpy(audio_req[1],audio_req[0],sizeof(struct AHIRequest));
if ( mixbuf[0] == NULL || mixbuf[1] == NULL ) {
SDL_OutOfMemory();
return(-1);
}
D(bug("Before mixbuf memset\n"));
memset(mixbuf[0], spec->silence, spec->size);
memset(mixbuf[1], spec->silence, spec->size);
current_buffer=0;
playing=0;
334
D(bug("AHI opened: freq:%ld mixbuf:%lx/%lx buflen:%ld bits:%ld channels:%ld\n",spec->freq,mixbuf[0],mixbuf[1],spec->size,this->hidden->bytespersample*8,spec->channels));
335
336
337
338
/* We're ready to rock and roll. :-) */
return(0);
}