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comparison src/audio/alsa/SDL_alsa_audio.c @ 1895:c121d94672cb

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SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:04:37 +0000
parents d7c9d7f42881
children 3b4ce57c6215
comparison
equal deleted inserted replaced
1894:c69cee13dd76 1895:c121d94672cb
22 #include "SDL_config.h" 22 #include "SDL_config.h"
23 23
24 /* Allow access to a raw mixing buffer */ 24 /* Allow access to a raw mixing buffer */
25 25
26 #include <sys/types.h> 26 #include <sys/types.h>
27 #include <signal.h> /* For kill() */ 27 #include <signal.h> /* For kill() */
28 28
29 #include "SDL_timer.h" 29 #include "SDL_timer.h"
30 #include "SDL_audio.h" 30 #include "SDL_audio.h"
31 #include "../SDL_audiomem.h" 31 #include "../SDL_audiomem.h"
32 #include "../SDL_audio_c.h" 32 #include "../SDL_audio_c.h"
46 46
47 /* The default ALSA audio driver */ 47 /* The default ALSA audio driver */
48 #define DEFAULT_DEVICE "default" 48 #define DEFAULT_DEVICE "default"
49 49
50 /* Audio driver functions */ 50 /* Audio driver functions */
51 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec); 51 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec * spec);
52 static void ALSA_WaitAudio(_THIS); 52 static void ALSA_WaitAudio(_THIS);
53 static void ALSA_PlayAudio(_THIS); 53 static void ALSA_PlayAudio(_THIS);
54 static Uint8 *ALSA_GetAudioBuf(_THIS); 54 static Uint8 *ALSA_GetAudioBuf(_THIS);
55 static void ALSA_CloseAudio(_THIS); 55 static void ALSA_CloseAudio(_THIS);
56 56
58 58
59 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC; 59 static const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC;
60 static void *alsa_handle = NULL; 60 static void *alsa_handle = NULL;
61 static int alsa_loaded = 0; 61 static int alsa_loaded = 0;
62 62
63 static int (*SDL_snd_pcm_open)(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode); 63 static int (*SDL_snd_pcm_open) (snd_pcm_t ** pcm, const char *name,
64 static int (*SDL_NAME(snd_pcm_open))(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode); 64 snd_pcm_stream_t stream, int mode);
65 static int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm); 65 static int (*SDL_NAME(snd_pcm_open)) (snd_pcm_t ** pcm, const char *name,
66 static snd_pcm_sframes_t (*SDL_NAME(snd_pcm_writei))(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size); 66 snd_pcm_stream_t stream, int mode);
67 static int (*SDL_NAME(snd_pcm_resume))(snd_pcm_t *pcm); 67 static int (*SDL_NAME(snd_pcm_close)) (snd_pcm_t * pcm);
68 static int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm); 68 static snd_pcm_sframes_t(*SDL_NAME(snd_pcm_writei)) (snd_pcm_t * pcm,
69 static int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm); 69 const void *buffer,
70 static const char *(*SDL_NAME(snd_strerror))(int errnum); 70 snd_pcm_uframes_t size);
71 static size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void); 71 static int (*SDL_NAME(snd_pcm_resume)) (snd_pcm_t * pcm);
72 static size_t (*SDL_NAME(snd_pcm_sw_params_sizeof))(void); 72 static int (*SDL_NAME(snd_pcm_prepare)) (snd_pcm_t * pcm);
73 static int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params); 73 static int (*SDL_NAME(snd_pcm_drain)) (snd_pcm_t * pcm);
74 static int (*SDL_NAME(snd_pcm_hw_params_set_access))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t access); 74 static const char *(*SDL_NAME(snd_strerror)) (int errnum);
75 static int (*SDL_NAME(snd_pcm_hw_params_set_format))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val); 75 static size_t(*SDL_NAME(snd_pcm_hw_params_sizeof)) (void);
76 static int (*SDL_NAME(snd_pcm_hw_params_set_channels))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val); 76 static size_t(*SDL_NAME(snd_pcm_sw_params_sizeof)) (void);
77 static int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params); 77 static int (*SDL_NAME(snd_pcm_hw_params_any)) (snd_pcm_t * pcm,
78 static unsigned int (*SDL_NAME(snd_pcm_hw_params_set_rate_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int *dir); 78 snd_pcm_hw_params_t * params);
79 static snd_pcm_uframes_t (*SDL_NAME(snd_pcm_hw_params_set_period_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t val, int *dir); 79 static int (*SDL_NAME(snd_pcm_hw_params_set_access)) (snd_pcm_t * pcm,
80 static snd_pcm_sframes_t (*SDL_NAME(snd_pcm_hw_params_get_period_size))(const snd_pcm_hw_params_t *params); 80 snd_pcm_hw_params_t *
81 static unsigned int (*SDL_NAME(snd_pcm_hw_params_set_periods_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val, int *dir); 81 params,
82 static int (*SDL_NAME(snd_pcm_hw_params_get_periods))(snd_pcm_hw_params_t *params); 82 snd_pcm_access_t
83 static int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params); 83 access);
84 static int (*SDL_NAME(snd_pcm_hw_params_set_format)) (snd_pcm_t * pcm,
85 snd_pcm_hw_params_t *
86 params,
87 snd_pcm_format_t val);
88 static int (*SDL_NAME(snd_pcm_hw_params_set_channels)) (snd_pcm_t * pcm,
89 snd_pcm_hw_params_t *
90 params,
91 unsigned int val);
92 static int (*SDL_NAME(snd_pcm_hw_params_get_channels)) (const
93 snd_pcm_hw_params_t *
94 params);
95 static unsigned int
96 (*SDL_NAME(snd_pcm_hw_params_set_rate_near)) (snd_pcm_t *
97 pcm,
98 snd_pcm_hw_params_t
99 * params,
100 unsigned int val, int *dir);
101 static snd_pcm_uframes_t
102 (*SDL_NAME(snd_pcm_hw_params_set_period_size_near)) (snd_pcm_t * pcm,
103 snd_pcm_hw_params_t
104 * params,
105 snd_pcm_uframes_t
106 val, int *dir);
107 static snd_pcm_sframes_t
108 (*SDL_NAME(snd_pcm_hw_params_get_period_size)) (const
109 snd_pcm_hw_params_t
110 * params);
111 static unsigned int
112 (*SDL_NAME(snd_pcm_hw_params_set_periods_near)) (snd_pcm_t * pcm,
113 snd_pcm_hw_params_t
114 * params,
115 unsigned int val,
116 int *dir);
117 static int (*SDL_NAME(snd_pcm_hw_params_get_periods)) (snd_pcm_hw_params_t *
118 params);
119 static int (*SDL_NAME(snd_pcm_hw_params)) (snd_pcm_t * pcm,
120 snd_pcm_hw_params_t * params);
84 /* 121 /*
85 */ 122 */
86 static int (*SDL_NAME(snd_pcm_sw_params_current))(snd_pcm_t *pcm, snd_pcm_sw_params_t *swparams); 123 static int (*SDL_NAME(snd_pcm_sw_params_current)) (snd_pcm_t * pcm,
87 static int (*SDL_NAME(snd_pcm_sw_params_set_start_threshold))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val); 124 snd_pcm_sw_params_t *
88 static int (*SDL_NAME(snd_pcm_sw_params_set_avail_min))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val); 125 swparams);
89 static int (*SDL_NAME(snd_pcm_sw_params))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params); 126 static int (*SDL_NAME(snd_pcm_sw_params_set_start_threshold)) (snd_pcm_t *
90 static int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock); 127 pcm,
128 snd_pcm_sw_params_t
129 * params,
130 snd_pcm_uframes_t
131 val);
132 static int (*SDL_NAME(snd_pcm_sw_params_set_avail_min)) (snd_pcm_t * pcm,
133 snd_pcm_sw_params_t
134 * params,
135 snd_pcm_uframes_t
136 val);
137 static int (*SDL_NAME(snd_pcm_sw_params)) (snd_pcm_t * pcm,
138 snd_pcm_sw_params_t * params);
139 static int (*SDL_NAME(snd_pcm_nonblock)) (snd_pcm_t * pcm, int nonblock);
91 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof) 140 #define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof)
92 #define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof) 141 #define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof)
93 142
94 /* cast funcs to char* first, to please GCC's strict aliasing rules. */ 143 /* cast funcs to char* first, to please GCC's strict aliasing rules. */
95 static struct { 144 static struct
96 const char *name; 145 {
97 void **func; 146 const char *name;
147 void **func;
98 } alsa_functions[] = { 148 } alsa_functions[] = {
99 { "snd_pcm_open", (void**)(char*)&SDL_NAME(snd_pcm_open) }, 149 {
100 { "snd_pcm_close", (void**)(char*)&SDL_NAME(snd_pcm_close) }, 150 "snd_pcm_open", (void **) (char *) &SDL_NAME(snd_pcm_open)}, {
101 { "snd_pcm_writei", (void**)(char*)&SDL_NAME(snd_pcm_writei) }, 151 "snd_pcm_close", (void **) (char *) &SDL_NAME(snd_pcm_close)}, {
102 { "snd_pcm_resume", (void**)(char*)&SDL_NAME(snd_pcm_resume) }, 152 "snd_pcm_writei", (void **) (char *) &SDL_NAME(snd_pcm_writei)}, {
103 { "snd_pcm_prepare", (void**)(char*)&SDL_NAME(snd_pcm_prepare) }, 153 "snd_pcm_resume", (void **) (char *) &SDL_NAME(snd_pcm_resume)}, {
104 { "snd_pcm_drain", (void**)(char*)&SDL_NAME(snd_pcm_drain) }, 154 "snd_pcm_prepare", (void **) (char *) &SDL_NAME(snd_pcm_prepare)}, {
105 { "snd_strerror", (void**)(char*)&SDL_NAME(snd_strerror) }, 155 "snd_pcm_drain", (void **) (char *) &SDL_NAME(snd_pcm_drain)}, {
106 { "snd_pcm_hw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_sizeof) }, 156 "snd_strerror", (void **) (char *) &SDL_NAME(snd_strerror)}, {
107 { "snd_pcm_sw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_sizeof) }, 157 "snd_pcm_hw_params_sizeof",
108 { "snd_pcm_hw_params_any", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_any) }, 158 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_sizeof)}, {
109 { "snd_pcm_hw_params_set_access", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_access) }, 159 "snd_pcm_sw_params_sizeof",
110 { "snd_pcm_hw_params_set_format", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_format) }, 160 (void **) (char *) &SDL_NAME(snd_pcm_sw_params_sizeof)}, {
111 { "snd_pcm_hw_params_set_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_channels) }, 161 "snd_pcm_hw_params_any",
112 { "snd_pcm_hw_params_get_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_channels) }, 162 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_any)}, {
113 { "snd_pcm_hw_params_set_rate_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_rate_near) }, 163 "snd_pcm_hw_params_set_access",
114 { "snd_pcm_hw_params_set_period_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) }, 164 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_set_access)}, {
115 { "snd_pcm_hw_params_get_period_size", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_period_size) }, 165 "snd_pcm_hw_params_set_format",
116 { "snd_pcm_hw_params_set_periods_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_periods_near) }, 166 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_set_format)}, {
117 { "snd_pcm_hw_params_get_periods", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_periods) }, 167 "snd_pcm_hw_params_set_channels",
118 { "snd_pcm_hw_params", (void**)(char*)&SDL_NAME(snd_pcm_hw_params) }, 168 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_set_channels)}, {
119 { "snd_pcm_sw_params_current", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_current) }, 169 "snd_pcm_hw_params_get_channels",
120 { "snd_pcm_sw_params_set_start_threshold", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_start_threshold) }, 170 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_get_channels)}, {
121 { "snd_pcm_sw_params_set_avail_min", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_avail_min) }, 171 "snd_pcm_hw_params_set_rate_near",
122 { "snd_pcm_sw_params", (void**)(char*)&SDL_NAME(snd_pcm_sw_params) }, 172 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_set_rate_near)}, {
123 { "snd_pcm_nonblock", (void**)(char*)&SDL_NAME(snd_pcm_nonblock) }, 173 "snd_pcm_hw_params_set_period_size_near", (void **) (char *)
124 }; 174 &SDL_NAME(snd_pcm_hw_params_set_period_size_near)}, {
125 175 "snd_pcm_hw_params_get_period_size",
126 static void UnloadALSALibrary(void) { 176 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_get_period_size)},
127 if (alsa_loaded) { 177 {
178 "snd_pcm_hw_params_set_periods_near", (void **) (char *)
179 &SDL_NAME(snd_pcm_hw_params_set_periods_near)}, {
180 "snd_pcm_hw_params_get_periods",
181 (void **) (char *) &SDL_NAME(snd_pcm_hw_params_get_periods)}, {
182 "snd_pcm_hw_params", (void **) (char *) &SDL_NAME(snd_pcm_hw_params)}, {
183 "snd_pcm_sw_params_current",
184 (void **) (char *) &SDL_NAME(snd_pcm_sw_params_current)}, {
185 "snd_pcm_sw_params_set_start_threshold", (void **) (char *)
186 &SDL_NAME(snd_pcm_sw_params_set_start_threshold)}, {
187 "snd_pcm_sw_params_set_avail_min",
188 (void **) (char *) &SDL_NAME(snd_pcm_sw_params_set_avail_min)}, {
189 "snd_pcm_sw_params", (void **) (char *) &SDL_NAME(snd_pcm_sw_params)}, {
190 "snd_pcm_nonblock", (void **) (char *) &SDL_NAME(snd_pcm_nonblock)},};
191
192 static void
193 UnloadALSALibrary(void)
194 {
195 if (alsa_loaded) {
128 /* SDL_UnloadObject(alsa_handle);*/ 196 /* SDL_UnloadObject(alsa_handle);*/
129 dlclose(alsa_handle); 197 dlclose(alsa_handle);
130 alsa_handle = NULL; 198 alsa_handle = NULL;
131 alsa_loaded = 0; 199 alsa_loaded = 0;
132 } 200 }
133 } 201 }
134 202
135 static int LoadALSALibrary(void) { 203 static int
136 int i, retval = -1; 204 LoadALSALibrary(void)
205 {
206 int i, retval = -1;
137 207
138 /* alsa_handle = SDL_LoadObject(alsa_library);*/ 208 /* alsa_handle = SDL_LoadObject(alsa_library);*/
139 alsa_handle = dlopen(alsa_library,RTLD_NOW); 209 alsa_handle = dlopen(alsa_library, RTLD_NOW);
140 if (alsa_handle) { 210 if (alsa_handle) {
141 alsa_loaded = 1; 211 alsa_loaded = 1;
142 retval = 0; 212 retval = 0;
143 for (i = 0; i < SDL_arraysize(alsa_functions); i++) { 213 for (i = 0; i < SDL_arraysize(alsa_functions); i++) {
144 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/ 214 /* *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name);*/
145 #if HAVE_DLVSYM 215 #if HAVE_DLVSYM
146 *alsa_functions[i].func = dlvsym(alsa_handle,alsa_functions[i].name,"ALSA_0.9"); 216 *alsa_functions[i].func =
147 if (!*alsa_functions[i].func) 217 dlvsym(alsa_handle, alsa_functions[i].name, "ALSA_0.9");
218 if (!*alsa_functions[i].func)
148 #endif 219 #endif
149 *alsa_functions[i].func = dlsym(alsa_handle,alsa_functions[i].name); 220 *alsa_functions[i].func =
150 if (!*alsa_functions[i].func) { 221 dlsym(alsa_handle, alsa_functions[i].name);
151 retval = -1; 222 if (!*alsa_functions[i].func) {
152 UnloadALSALibrary(); 223 retval = -1;
153 break; 224 UnloadALSALibrary();
154 } 225 break;
155 } 226 }
156 } 227 }
157 return retval; 228 }
229 return retval;
158 } 230 }
159 231
160 #else 232 #else
161 233
162 static void UnloadALSALibrary(void) { 234 static void
163 return; 235 UnloadALSALibrary(void)
164 } 236 {
165 237 return;
166 static int LoadALSALibrary(void) { 238 }
167 return 0; 239
240 static int
241 LoadALSALibrary(void)
242 {
243 return 0;
168 } 244 }
169 245
170 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */ 246 #endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */
171 247
172 static const char *get_audio_device(int channels) 248 static const char *
173 { 249 get_audio_device(int channels)
174 const char *device; 250 {
175 251 const char *device;
176 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */ 252
177 if ( device == NULL ) { 253 device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */
178 if (channels == 6) device = "surround51"; 254 if (device == NULL) {
179 else if (channels == 4) device = "surround40"; 255 if (channels == 6)
180 else device = DEFAULT_DEVICE; 256 device = "surround51";
181 } 257 else if (channels == 4)
182 return device; 258 device = "surround40";
259 else
260 device = DEFAULT_DEVICE;
261 }
262 return device;
183 } 263 }
184 264
185 /* Audio driver bootstrap functions */ 265 /* Audio driver bootstrap functions */
186 266
187 static int Audio_Available(void) 267 static int
188 { 268 Audio_Available(void)
189 int available; 269 {
190 int status; 270 int available;
191 snd_pcm_t *handle; 271 int status;
192 272 snd_pcm_t *handle;
193 available = 0; 273
194 if (LoadALSALibrary() < 0) { 274 available = 0;
195 return available; 275 if (LoadALSALibrary() < 0) {
196 } 276 return available;
197 status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); 277 }
198 if ( status >= 0 ) { 278 status =
199 available = 1; 279 SDL_NAME(snd_pcm_open) (&handle, get_audio_device(2),
200 SDL_NAME(snd_pcm_close)(handle); 280 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
201 } 281 if (status >= 0) {
202 UnloadALSALibrary(); 282 available = 1;
203 return(available); 283 SDL_NAME(snd_pcm_close) (handle);
204 } 284 }
205 285 UnloadALSALibrary();
206 static void Audio_DeleteDevice(SDL_AudioDevice *device) 286 return (available);
207 { 287 }
208 SDL_free(device->hidden); 288
209 SDL_free(device); 289 static void
210 UnloadALSALibrary(); 290 Audio_DeleteDevice(SDL_AudioDevice * device)
211 } 291 {
212 292 SDL_free(device->hidden);
213 static SDL_AudioDevice *Audio_CreateDevice(int devindex) 293 SDL_free(device);
214 { 294 UnloadALSALibrary();
215 SDL_AudioDevice *this; 295 }
216 296
217 /* Initialize all variables that we clean on shutdown */ 297 static SDL_AudioDevice *
218 LoadALSALibrary(); 298 Audio_CreateDevice(int devindex)
219 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); 299 {
220 if ( this ) { 300 SDL_AudioDevice *this;
221 SDL_memset(this, 0, (sizeof *this)); 301
222 this->hidden = (struct SDL_PrivateAudioData *) 302 /* Initialize all variables that we clean on shutdown */
223 SDL_malloc((sizeof *this->hidden)); 303 LoadALSALibrary();
224 } 304 this = (SDL_AudioDevice *) SDL_malloc(sizeof(SDL_AudioDevice));
225 if ( (this == NULL) || (this->hidden == NULL) ) { 305 if (this) {
226 SDL_OutOfMemory(); 306 SDL_memset(this, 0, (sizeof *this));
227 if ( this ) { 307 this->hidden = (struct SDL_PrivateAudioData *)
228 SDL_free(this); 308 SDL_malloc((sizeof *this->hidden));
229 } 309 }
230 return(0); 310 if ((this == NULL) || (this->hidden == NULL)) {
231 } 311 SDL_OutOfMemory();
232 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); 312 if (this) {
233 313 SDL_free(this);
234 /* Set the function pointers */ 314 }
235 this->OpenAudio = ALSA_OpenAudio; 315 return (0);
236 this->WaitAudio = ALSA_WaitAudio; 316 }
237 this->PlayAudio = ALSA_PlayAudio; 317 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
238 this->GetAudioBuf = ALSA_GetAudioBuf; 318
239 this->CloseAudio = ALSA_CloseAudio; 319 /* Set the function pointers */
240 320 this->OpenAudio = ALSA_OpenAudio;
241 this->free = Audio_DeleteDevice; 321 this->WaitAudio = ALSA_WaitAudio;
242 322 this->PlayAudio = ALSA_PlayAudio;
243 return this; 323 this->GetAudioBuf = ALSA_GetAudioBuf;
324 this->CloseAudio = ALSA_CloseAudio;
325
326 this->free = Audio_DeleteDevice;
327
328 return this;
244 } 329 }
245 330
246 AudioBootStrap ALSA_bootstrap = { 331 AudioBootStrap ALSA_bootstrap = {
247 DRIVER_NAME, "ALSA 0.9 PCM audio", 332 DRIVER_NAME, "ALSA 0.9 PCM audio",
248 Audio_Available, Audio_CreateDevice 333 Audio_Available, Audio_CreateDevice
249 }; 334 };
250 335
251 /* This function waits until it is possible to write a full sound buffer */ 336 /* This function waits until it is possible to write a full sound buffer */
252 static void ALSA_WaitAudio(_THIS) 337 static void
253 { 338 ALSA_WaitAudio(_THIS)
254 /* Check to see if the thread-parent process is still alive */ 339 {
255 { static int cnt = 0; 340 /* Check to see if the thread-parent process is still alive */
256 /* Note that this only works with thread implementations 341 {
257 that use a different process id for each thread. 342 static int cnt = 0;
258 */ 343 /* Note that this only works with thread implementations
259 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ 344 that use a different process id for each thread.
260 if ( kill(parent, 0) < 0 ) { 345 */
261 this->enabled = 0; 346 if (parent && (((++cnt) % 10) == 0)) { /* Check every 10 loops */
262 } 347 if (kill(parent, 0) < 0) {
263 } 348 this->enabled = 0;
264 } 349 }
350 }
351 }
265 } 352 }
266 353
267 354
268 /* 355 /*
269 * http://bugzilla.libsdl.org/show_bug.cgi?id=110 356 * http://bugzilla.libsdl.org/show_bug.cgi?id=110
278 T tmp; \ 365 T tmp; \
279 tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \ 366 tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \
280 tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \ 367 tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \
281 } 368 }
282 369
283 static __inline__ void swizzle_alsa_channels_6_64bit(_THIS) { SWIZ6(Uint64); } 370 static __inline__ void
284 static __inline__ void swizzle_alsa_channels_6_32bit(_THIS) { SWIZ6(Uint32); } 371 swizzle_alsa_channels_6_64bit(_THIS)
285 static __inline__ void swizzle_alsa_channels_6_16bit(_THIS) { SWIZ6(Uint16); } 372 {
286 static __inline__ void swizzle_alsa_channels_6_8bit(_THIS) { SWIZ6(Uint8); } 373 SWIZ6(Uint64);
374 }
375 static __inline__ void
376 swizzle_alsa_channels_6_32bit(_THIS)
377 {
378 SWIZ6(Uint32);
379 }
380 static __inline__ void
381 swizzle_alsa_channels_6_16bit(_THIS)
382 {
383 SWIZ6(Uint16);
384 }
385 static __inline__ void
386 swizzle_alsa_channels_6_8bit(_THIS)
387 {
388 SWIZ6(Uint8);
389 }
287 390
288 #undef SWIZ6 391 #undef SWIZ6
289 392
290 393
291 /* 394 /*
292 * Called right before feeding this->mixbuf to the hardware. Swizzle channels 395 * Called right before feeding this->mixbuf to the hardware. Swizzle channels
293 * from Windows/Mac order to the format alsalib will want. 396 * from Windows/Mac order to the format alsalib will want.
294 */ 397 */
295 static __inline__ void swizzle_alsa_channels(_THIS) 398 static __inline__ void
399 swizzle_alsa_channels(_THIS)
296 { 400 {
297 if (this->spec.channels == 6) { 401 if (this->spec.channels == 6) {
298 const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */ 402 const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */
299 if (fmtsize == 16) 403 if (fmtsize == 16)
300 swizzle_alsa_channels_6_16bit(this); 404 swizzle_alsa_channels_6_16bit(this);
301 else if (fmtsize == 8) 405 else if (fmtsize == 8)
302 swizzle_alsa_channels_6_8bit(this); 406 swizzle_alsa_channels_6_8bit(this);
303 else if (fmtsize == 32) 407 else if (fmtsize == 32)
308 412
309 /* !!! FIXME: update this for 7.1 if needed, later. */ 413 /* !!! FIXME: update this for 7.1 if needed, later. */
310 } 414 }
311 415
312 416
313 static void ALSA_PlayAudio(_THIS) 417 static void
314 { 418 ALSA_PlayAudio(_THIS)
315 int status; 419 {
316 int sample_len; 420 int status;
317 signed short *sample_buf; 421 int sample_len;
318 422 signed short *sample_buf;
319 swizzle_alsa_channels(this); 423
320 424 swizzle_alsa_channels(this);
321 sample_len = this->spec.samples; 425
322 sample_buf = (signed short *)mixbuf; 426 sample_len = this->spec.samples;
323 427 sample_buf = (signed short *) mixbuf;
324 while ( sample_len > 0 ) { 428
325 status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, sample_len); 429 while (sample_len > 0) {
326 if ( status < 0 ) { 430 status =
327 if ( status == -EAGAIN ) { 431 SDL_NAME(snd_pcm_writei) (pcm_handle, sample_buf, sample_len);
328 SDL_Delay(1); 432 if (status < 0) {
329 continue; 433 if (status == -EAGAIN) {
330 } 434 SDL_Delay(1);
331 if ( status == -ESTRPIPE ) { 435 continue;
332 do { 436 }
333 SDL_Delay(1); 437 if (status == -ESTRPIPE) {
334 status = SDL_NAME(snd_pcm_resume)(pcm_handle); 438 do {
335 } while ( status == -EAGAIN ); 439 SDL_Delay(1);
336 } 440 status = SDL_NAME(snd_pcm_resume) (pcm_handle);
337 if ( status < 0 ) { 441 } while (status == -EAGAIN);
338 status = SDL_NAME(snd_pcm_prepare)(pcm_handle); 442 }
339 } 443 if (status < 0) {
340 if ( status < 0 ) { 444 status = SDL_NAME(snd_pcm_prepare) (pcm_handle);
341 /* Hmm, not much we can do - abort */ 445 }
342 this->enabled = 0; 446 if (status < 0) {
343 return; 447 /* Hmm, not much we can do - abort */
344 } 448 this->enabled = 0;
345 continue; 449 return;
346 } 450 }
347 sample_buf += status * this->spec.channels; 451 continue;
348 sample_len -= status; 452 }
349 } 453 sample_buf += status * this->spec.channels;
350 } 454 sample_len -= status;
351 455 }
352 static Uint8 *ALSA_GetAudioBuf(_THIS) 456 }
353 { 457
354 return(mixbuf); 458 static Uint8 *
355 } 459 ALSA_GetAudioBuf(_THIS)
356 460 {
357 static void ALSA_CloseAudio(_THIS) 461 return (mixbuf);
358 { 462 }
359 if ( mixbuf != NULL ) { 463
360 SDL_FreeAudioMem(mixbuf); 464 static void
361 mixbuf = NULL; 465 ALSA_CloseAudio(_THIS)
362 } 466 {
363 if ( pcm_handle ) { 467 if (mixbuf != NULL) {
364 SDL_NAME(snd_pcm_drain)(pcm_handle); 468 SDL_FreeAudioMem(mixbuf);
365 SDL_NAME(snd_pcm_close)(pcm_handle); 469 mixbuf = NULL;
366 pcm_handle = NULL; 470 }
367 } 471 if (pcm_handle) {
368 } 472 SDL_NAME(snd_pcm_drain) (pcm_handle);
369 473 SDL_NAME(snd_pcm_close) (pcm_handle);
370 static int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec) 474 pcm_handle = NULL;
371 { 475 }
372 int status; 476 }
373 snd_pcm_hw_params_t *hwparams; 477
374 snd_pcm_sw_params_t *swparams; 478 static int
375 snd_pcm_format_t format; 479 ALSA_OpenAudio(_THIS, SDL_AudioSpec * spec)
376 snd_pcm_uframes_t frames; 480 {
377 Uint16 test_format; 481 int status;
378 482 snd_pcm_hw_params_t *hwparams;
379 /* Open the audio device */ 483 snd_pcm_sw_params_t *swparams;
380 /* Name of device should depend on # channels in spec */ 484 snd_pcm_format_t format;
381 status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(spec->channels), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); 485 snd_pcm_uframes_t frames;
382 486 Uint16 test_format;
383 if ( status < 0 ) { 487
384 SDL_SetError("Couldn't open audio device: %s", SDL_NAME(snd_strerror)(status)); 488 /* Open the audio device */
385 return(-1); 489 /* Name of device should depend on # channels in spec */
386 } 490 status =
387 491 SDL_NAME(snd_pcm_open) (&pcm_handle,
388 /* Figure out what the hardware is capable of */ 492 get_audio_device(spec->channels),
389 snd_pcm_hw_params_alloca(&hwparams); 493 SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
390 status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, hwparams); 494
391 if ( status < 0 ) { 495 if (status < 0) {
392 SDL_SetError("Couldn't get hardware config: %s", SDL_NAME(snd_strerror)(status)); 496 SDL_SetError("Couldn't open audio device: %s",
393 ALSA_CloseAudio(this); 497 SDL_NAME(snd_strerror) (status));
394 return(-1); 498 return (-1);
395 } 499 }
396 500
397 /* SDL only uses interleaved sample output */ 501 /* Figure out what the hardware is capable of */
398 status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED); 502 snd_pcm_hw_params_alloca(&hwparams);
399 if ( status < 0 ) { 503 status = SDL_NAME(snd_pcm_hw_params_any) (pcm_handle, hwparams);
400 SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status)); 504 if (status < 0) {
401 ALSA_CloseAudio(this); 505 SDL_SetError("Couldn't get hardware config: %s",
402 return(-1); 506 SDL_NAME(snd_strerror) (status));
403 } 507 ALSA_CloseAudio(this);
404 508 return (-1);
405 /* Try for a closest match on audio format */ 509 }
406 status = -1; 510
407 for ( test_format = SDL_FirstAudioFormat(spec->format); 511 /* SDL only uses interleaved sample output */
408 test_format && (status < 0); ) { 512 status =
409 switch ( test_format ) { 513 SDL_NAME(snd_pcm_hw_params_set_access) (pcm_handle, hwparams,
410 case AUDIO_U8: 514 SND_PCM_ACCESS_RW_INTERLEAVED);
411 format = SND_PCM_FORMAT_U8; 515 if (status < 0) {
412 break; 516 SDL_SetError("Couldn't set interleaved access: %s",
413 case AUDIO_S8: 517 SDL_NAME(snd_strerror) (status));
414 format = SND_PCM_FORMAT_S8; 518 ALSA_CloseAudio(this);
415 break; 519 return (-1);
416 case AUDIO_S16LSB: 520 }
417 format = SND_PCM_FORMAT_S16_LE; 521
418 break; 522 /* Try for a closest match on audio format */
419 case AUDIO_S16MSB: 523 status = -1;
420 format = SND_PCM_FORMAT_S16_BE; 524 for (test_format = SDL_FirstAudioFormat(spec->format);
421 break; 525 test_format && (status < 0);) {
422 case AUDIO_U16LSB: 526 switch (test_format) {
423 format = SND_PCM_FORMAT_U16_LE; 527 case AUDIO_U8:
424 break; 528 format = SND_PCM_FORMAT_U8;
425 case AUDIO_U16MSB: 529 break;
426 format = SND_PCM_FORMAT_U16_BE; 530 case AUDIO_S8:
427 break; 531 format = SND_PCM_FORMAT_S8;
428 default: 532 break;
429 format = 0; 533 case AUDIO_S16LSB:
430 break; 534 format = SND_PCM_FORMAT_S16_LE;
431 } 535 break;
432 if ( format != 0 ) { 536 case AUDIO_S16MSB:
433 status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, hwparams, format); 537 format = SND_PCM_FORMAT_S16_BE;
434 } 538 break;
435 if ( status < 0 ) { 539 case AUDIO_U16LSB:
436 test_format = SDL_NextAudioFormat(); 540 format = SND_PCM_FORMAT_U16_LE;
437 } 541 break;
438 } 542 case AUDIO_U16MSB:
439 if ( status < 0 ) { 543 format = SND_PCM_FORMAT_U16_BE;
440 SDL_SetError("Couldn't find any hardware audio formats"); 544 break;
441 ALSA_CloseAudio(this); 545 default:
442 return(-1); 546 format = 0;
443 } 547 break;
444 spec->format = test_format; 548 }
445 549 if (format != 0) {
446 /* Set the number of channels */ 550 status =
447 status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, hwparams, spec->channels); 551 SDL_NAME(snd_pcm_hw_params_set_format) (pcm_handle,
448 if ( status < 0 ) { 552 hwparams, format);
449 status = SDL_NAME(snd_pcm_hw_params_get_channels)(hwparams); 553 }
450 if ( (status <= 0) || (status > 2) ) { 554 if (status < 0) {
451 SDL_SetError("Couldn't set audio channels"); 555 test_format = SDL_NextAudioFormat();
452 ALSA_CloseAudio(this); 556 }
453 return(-1); 557 }
454 } 558 if (status < 0) {
455 spec->channels = status; 559 SDL_SetError("Couldn't find any hardware audio formats");
456 } 560 ALSA_CloseAudio(this);
457 561 return (-1);
458 /* Set the audio rate */ 562 }
459 status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, hwparams, spec->freq, NULL); 563 spec->format = test_format;
460 if ( status < 0 ) { 564
461 SDL_SetError("Couldn't set audio frequency: %s", SDL_NAME(snd_strerror)(status)); 565 /* Set the number of channels */
462 ALSA_CloseAudio(this); 566 status =
463 return(-1); 567 SDL_NAME(snd_pcm_hw_params_set_channels) (pcm_handle, hwparams,
464 } 568 spec->channels);
465 spec->freq = status; 569 if (status < 0) {
466 570 status = SDL_NAME(snd_pcm_hw_params_get_channels) (hwparams);
467 /* Set the buffer size, in samples */ 571 if ((status <= 0) || (status > 2)) {
468 frames = spec->samples; 572 SDL_SetError("Couldn't set audio channels");
469 frames = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, hwparams, frames, NULL); 573 ALSA_CloseAudio(this);
470 spec->samples = frames; 574 return (-1);
471 SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, hwparams, 2, NULL); 575 }
472 576 spec->channels = status;
473 /* "set" the hardware with the desired parameters */ 577 }
474 status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, hwparams); 578
475 if ( status < 0 ) { 579 /* Set the audio rate */
476 SDL_SetError("Couldn't set hardware audio parameters: %s", SDL_NAME(snd_strerror)(status)); 580 status =
477 ALSA_CloseAudio(this); 581 SDL_NAME(snd_pcm_hw_params_set_rate_near) (pcm_handle, hwparams,
478 return(-1); 582 spec->freq, NULL);
479 } 583 if (status < 0) {
584 SDL_SetError("Couldn't set audio frequency: %s",
585 SDL_NAME(snd_strerror) (status));
586 ALSA_CloseAudio(this);
587 return (-1);
588 }
589 spec->freq = status;
590
591 /* Set the buffer size, in samples */
592 frames = spec->samples;
593 frames =
594 SDL_NAME(snd_pcm_hw_params_set_period_size_near) (pcm_handle,
595 hwparams, frames,
596 NULL);
597 spec->samples = frames;
598 SDL_NAME(snd_pcm_hw_params_set_periods_near) (pcm_handle, hwparams, 2,
599 NULL);
600
601 /* "set" the hardware with the desired parameters */
602 status = SDL_NAME(snd_pcm_hw_params) (pcm_handle, hwparams);
603 if (status < 0) {
604 SDL_SetError("Couldn't set hardware audio parameters: %s",
605 SDL_NAME(snd_strerror) (status));
606 ALSA_CloseAudio(this);
607 return (-1);
608 }
480 609
481 /* This is useful for debugging... */ 610 /* This is useful for debugging... */
482 /* 611 /*
483 { snd_pcm_sframes_t bufsize; int fragments; 612 { snd_pcm_sframes_t bufsize; int fragments;
484 bufsize = SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams); 613 bufsize = SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams);
486 615
487 fprintf(stderr, "ALSA: bufsize = %ld, fragments = %d\n", bufsize, fragments); 616 fprintf(stderr, "ALSA: bufsize = %ld, fragments = %d\n", bufsize, fragments);
488 } 617 }
489 */ 618 */
490 619
491 /* Set the software parameters */ 620 /* Set the software parameters */
492 snd_pcm_sw_params_alloca(&swparams); 621 snd_pcm_sw_params_alloca(&swparams);
493 status = SDL_NAME(snd_pcm_sw_params_current)(pcm_handle, swparams); 622 status = SDL_NAME(snd_pcm_sw_params_current) (pcm_handle, swparams);
494 if ( status < 0 ) { 623 if (status < 0) {
495 SDL_SetError("Couldn't get software config: %s", SDL_NAME(snd_strerror)(status)); 624 SDL_SetError("Couldn't get software config: %s",
496 ALSA_CloseAudio(this); 625 SDL_NAME(snd_strerror) (status));
497 return(-1); 626 ALSA_CloseAudio(this);
498 } 627 return (-1);
499 status = SDL_NAME(snd_pcm_sw_params_set_start_threshold)(pcm_handle, swparams, 0); 628 }
500 if ( status < 0 ) { 629 status =
501 SDL_SetError("Couldn't set start threshold: %s", SDL_NAME(snd_strerror)(status)); 630 SDL_NAME(snd_pcm_sw_params_set_start_threshold) (pcm_handle,
502 ALSA_CloseAudio(this); 631 swparams, 0);
503 return(-1); 632 if (status < 0) {
504 } 633 SDL_SetError("Couldn't set start threshold: %s",
505 status = SDL_NAME(snd_pcm_sw_params_set_avail_min)(pcm_handle, swparams, frames); 634 SDL_NAME(snd_strerror) (status));
506 if ( status < 0 ) { 635 ALSA_CloseAudio(this);
507 SDL_SetError("Couldn't set avail min: %s", SDL_NAME(snd_strerror)(status)); 636 return (-1);
508 ALSA_CloseAudio(this); 637 }
509 return(-1); 638 status =
510 } 639 SDL_NAME(snd_pcm_sw_params_set_avail_min) (pcm_handle, swparams,
511 status = SDL_NAME(snd_pcm_sw_params)(pcm_handle, swparams); 640 frames);
512 if ( status < 0 ) { 641 if (status < 0) {
513 SDL_SetError("Couldn't set software audio parameters: %s", SDL_NAME(snd_strerror)(status)); 642 SDL_SetError("Couldn't set avail min: %s",
514 ALSA_CloseAudio(this); 643 SDL_NAME(snd_strerror) (status));
515 return(-1); 644 ALSA_CloseAudio(this);
516 } 645 return (-1);
517 646 }
518 /* Calculate the final parameters for this audio specification */ 647 status = SDL_NAME(snd_pcm_sw_params) (pcm_handle, swparams);
519 SDL_CalculateAudioSpec(spec); 648 if (status < 0) {
520 649 SDL_SetError("Couldn't set software audio parameters: %s",
521 /* Allocate mixing buffer */ 650 SDL_NAME(snd_strerror) (status));
522 mixlen = spec->size; 651 ALSA_CloseAudio(this);
523 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); 652 return (-1);
524 if ( mixbuf == NULL ) { 653 }
525 ALSA_CloseAudio(this); 654
526 return(-1); 655 /* Calculate the final parameters for this audio specification */
527 } 656 SDL_CalculateAudioSpec(spec);
528 SDL_memset(mixbuf, spec->silence, spec->size); 657
529 658 /* Allocate mixing buffer */
530 /* Get the parent process id (we're the parent of the audio thread) */ 659 mixlen = spec->size;
531 parent = getpid(); 660 mixbuf = (Uint8 *) SDL_AllocAudioMem(mixlen);
532 661 if (mixbuf == NULL) {
533 /* Switch to blocking mode for playback */ 662 ALSA_CloseAudio(this);
534 SDL_NAME(snd_pcm_nonblock)(pcm_handle, 0); 663 return (-1);
535 664 }
536 /* We're ready to rock and roll. :-) */ 665 SDL_memset(mixbuf, spec->silence, spec->size);
537 return(0); 666
538 } 667 /* Get the parent process id (we're the parent of the audio thread) */
668 parent = getpid();
669
670 /* Switch to blocking mode for playback */
671 SDL_NAME(snd_pcm_nonblock) (pcm_handle, 0);
672
673 /* We're ready to rock and roll. :-) */
674 return (0);
675 }
676
677 /* vi: set ts=4 sw=4 expandtab: */