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ef79bbde P |
1 | /*************************************************************************** |
2 | pulseaudio.c - description | |
3 | ------------------- | |
4 | begin : Thu Feb 04 2010 | |
5 | copyright : (C) 2010 by Tristin Celestin | |
6 | email : cetris1@umbc.edu | |
7 | comment : Much of this was taken from simple.c, in the pulseaudio | |
8 | library | |
9 | ***************************************************************************/ | |
10 | /*************************************************************************** | |
11 | * * | |
12 | * This program is free software; you can redistribute it and/or modify * | |
13 | * it under the terms of the GNU General Public License as published by * | |
14 | * the Free Software Foundation; either version 2 of the License, or * | |
15 | * (at your option) any later version. See also the license.txt file for * | |
16 | * additional informations. * | |
17 | * * | |
18 | ***************************************************************************/ | |
19 | ||
20 | #include "stdafx.h" | |
21 | ||
ef79bbde P |
22 | #define _IN_OSS |
23 | ||
24 | #include "externals.h" | |
25 | #include <pulse/pulseaudio.h> | |
26 | ||
27 | //////////////////////////////////////////////////////////////////////// | |
28 | // pulseaudio structs | |
29 | //////////////////////////////////////////////////////////////////////// | |
30 | ||
31 | typedef struct { | |
32 | pa_threaded_mainloop *mainloop; | |
33 | pa_context *context; | |
34 | pa_mainloop_api *api; | |
35 | pa_stream *stream; | |
36 | pa_sample_spec spec; | |
37 | int first; | |
38 | } Device; | |
39 | ||
40 | typedef struct { | |
41 | unsigned int frequency; | |
42 | unsigned int latency_in_msec; | |
43 | } Settings; | |
44 | ||
45 | //////////////////////////////////////////////////////////////////////// | |
46 | // pulseaudio globals | |
47 | //////////////////////////////////////////////////////////////////////// | |
48 | ||
49 | static Device device = { | |
50 | .mainloop = NULL, | |
51 | .api = NULL, | |
52 | .context = NULL, | |
53 | .stream = NULL | |
54 | }; | |
55 | ||
56 | static Settings settings = { | |
57 | .frequency = 44100, | |
58 | .latency_in_msec = 20, | |
59 | }; | |
60 | ||
61 | // the number of bytes written in SoundFeedStreamData | |
62 | const int mixlen = 3240; | |
63 | ||
64 | // used to calculate how much space is used in the buffer, for debugging purposes | |
65 | //int maxlength = 0; | |
66 | ||
67 | //////////////////////////////////////////////////////////////////////// | |
68 | // CALLBACKS FOR THREADED MAINLOOP | |
69 | //////////////////////////////////////////////////////////////////////// | |
70 | static void context_state_cb (pa_context *context, void *userdata) | |
71 | { | |
72 | Device *dev = userdata; | |
73 | ||
74 | if ((context == NULL) || (dev == NULL)) | |
75 | return; | |
76 | ||
77 | switch (pa_context_get_state (context)) | |
78 | { | |
79 | case PA_CONTEXT_READY: | |
80 | case PA_CONTEXT_TERMINATED: | |
81 | case PA_CONTEXT_FAILED: | |
82 | pa_threaded_mainloop_signal (dev->mainloop, 0); | |
83 | break; | |
84 | ||
85 | case PA_CONTEXT_UNCONNECTED: | |
86 | case PA_CONTEXT_CONNECTING: | |
87 | case PA_CONTEXT_AUTHORIZING: | |
88 | case PA_CONTEXT_SETTING_NAME: | |
89 | break; | |
90 | } | |
91 | } | |
92 | ||
93 | static void stream_state_cb (pa_stream *stream, void * userdata) | |
94 | { | |
95 | Device *dev = userdata; | |
96 | ||
97 | if ((stream == NULL) || (dev == NULL)) | |
98 | return; | |
99 | ||
100 | switch (pa_stream_get_state (stream)) | |
101 | { | |
102 | case PA_STREAM_READY: | |
103 | case PA_STREAM_FAILED: | |
104 | case PA_STREAM_TERMINATED: | |
105 | pa_threaded_mainloop_signal (dev->mainloop, 0); | |
106 | break; | |
107 | ||
108 | case PA_STREAM_UNCONNECTED: | |
109 | case PA_STREAM_CREATING: | |
110 | break; | |
111 | } | |
112 | } | |
113 | ||
114 | static void stream_latency_update_cb (pa_stream *stream, void *userdata) | |
115 | { | |
116 | Device *dev = userdata; | |
117 | ||
118 | if ((stream == NULL) || (dev == NULL)) | |
119 | return; | |
120 | ||
121 | pa_threaded_mainloop_signal (dev->mainloop, 0); | |
122 | } | |
123 | ||
124 | static void stream_request_cb (pa_stream *stream, size_t length, void *userdata) | |
125 | { | |
126 | Device *dev = userdata; | |
127 | ||
128 | if ((stream == NULL) || (dev == NULL)) | |
129 | return; | |
130 | pa_threaded_mainloop_signal (dev->mainloop, 0); | |
131 | } | |
132 | ||
133 | //////////////////////////////////////////////////////////////////////// | |
134 | // SETUP SOUND | |
135 | //////////////////////////////////////////////////////////////////////// | |
136 | ||
07c13dfd | 137 | static void pulse_init(void) |
ef79bbde P |
138 | { |
139 | int error_number; | |
140 | ||
141 | // Acquire mainloop /////////////////////////////////////////////////////// | |
142 | device.mainloop = pa_threaded_mainloop_new (); | |
143 | if (device.mainloop == NULL) | |
144 | { | |
145 | fprintf (stderr, "Could not acquire PulseAudio main loop\n"); | |
07c13dfd | 146 | return -1; |
ef79bbde P |
147 | } |
148 | ||
149 | // Acquire context //////////////////////////////////////////////////////// | |
150 | device.api = pa_threaded_mainloop_get_api (device.mainloop); | |
151 | device.context = pa_context_new (device.api, "PCSX"); | |
152 | pa_context_set_state_callback (device.context, context_state_cb, &device); | |
153 | ||
154 | if (device.context == NULL) | |
155 | { | |
156 | fprintf (stderr, "Could not acquire PulseAudio device context\n"); | |
07c13dfd | 157 | return -1; |
ef79bbde P |
158 | } |
159 | ||
160 | // Connect to PulseAudio server /////////////////////////////////////////// | |
161 | if (pa_context_connect (device.context, NULL, 0, NULL) < 0) | |
162 | { | |
163 | error_number = pa_context_errno (device.context); | |
164 | fprintf (stderr, "Could not connect to PulseAudio server: %s\n", pa_strerror(error_number)); | |
07c13dfd | 165 | return -1; |
ef79bbde P |
166 | } |
167 | ||
168 | // Run mainloop until sever context is ready ////////////////////////////// | |
169 | pa_threaded_mainloop_lock (device.mainloop); | |
170 | if (pa_threaded_mainloop_start (device.mainloop) < 0) | |
171 | { | |
172 | fprintf (stderr, "Could not start mainloop\n"); | |
07c13dfd | 173 | return -1; |
ef79bbde P |
174 | } |
175 | ||
176 | pa_context_state_t context_state; | |
177 | context_state = pa_context_get_state (device.context); | |
178 | while (context_state != PA_CONTEXT_READY) | |
179 | { | |
180 | context_state = pa_context_get_state (device.context); | |
181 | if (! PA_CONTEXT_IS_GOOD (context_state)) | |
182 | { | |
183 | error_number = pa_context_errno (device.context); | |
184 | fprintf (stderr, "Context state is not good: %s\n", pa_strerror (error_number)); | |
07c13dfd | 185 | return -1; |
ef79bbde P |
186 | } |
187 | else if (context_state == PA_CONTEXT_READY) | |
188 | break; | |
189 | else | |
190 | fprintf (stderr, "PulseAudio context state is %d\n", context_state); | |
191 | pa_threaded_mainloop_wait (device.mainloop); | |
192 | } | |
193 | ||
194 | // Set sample spec //////////////////////////////////////////////////////// | |
195 | device.spec.format = PA_SAMPLE_S16NE; | |
97ea4077 | 196 | device.spec.channels = 2; |
ef79bbde P |
197 | device.spec.rate = settings.frequency; |
198 | ||
199 | pa_buffer_attr buffer_attributes; | |
200 | buffer_attributes.tlength = pa_bytes_per_second (& device.spec) / 5; | |
201 | buffer_attributes.maxlength = buffer_attributes.tlength * 3; | |
202 | buffer_attributes.minreq = buffer_attributes.tlength / 3; | |
203 | buffer_attributes.prebuf = buffer_attributes.tlength; | |
204 | ||
205 | //maxlength = buffer_attributes.maxlength; | |
206 | //fprintf (stderr, "Total space: %u\n", buffer_attributes.maxlength); | |
207 | //fprintf (stderr, "Minimum request size: %u\n", buffer_attributes.minreq); | |
208 | //fprintf (stderr, "Bytes needed before playback: %u\n", buffer_attributes.prebuf); | |
209 | //fprintf (stderr, "Target buffer size: %lu\n", buffer_attributes.tlength); | |
210 | ||
211 | // Acquire new stream using spec ////////////////////////////////////////// | |
212 | device.stream = pa_stream_new (device.context, "PCSX", &device.spec, NULL); | |
213 | if (device.stream == NULL) | |
214 | { | |
215 | error_number = pa_context_errno (device.context); | |
216 | fprintf (stderr, "Could not acquire new PulseAudio stream: %s\n", pa_strerror (error_number)); | |
07c13dfd | 217 | return -1; |
ef79bbde P |
218 | } |
219 | ||
220 | // Set callbacks for server events //////////////////////////////////////// | |
221 | pa_stream_set_state_callback (device.stream, stream_state_cb, &device); | |
222 | pa_stream_set_write_callback (device.stream, stream_request_cb, &device); | |
223 | pa_stream_set_latency_update_callback (device.stream, stream_latency_update_cb, &device); | |
224 | ||
225 | // Ready stream for playback ////////////////////////////////////////////// | |
226 | pa_stream_flags_t flags = (pa_stream_flags_t) (PA_STREAM_ADJUST_LATENCY | PA_STREAM_INTERPOLATE_TIMING | PA_STREAM_AUTO_TIMING_UPDATE); | |
227 | //pa_stream_flags_t flags = (pa_stream_flags_t) (PA_STREAM_INTERPOLATE_TIMING | PA_STREAM_AUTO_TIMING_UPDATE | PA_STREAM_EARLY_REQUESTS); | |
228 | if (pa_stream_connect_playback (device.stream, NULL, &buffer_attributes, flags, NULL, NULL) < 0) | |
229 | { | |
230 | pa_context_errno (device.context); | |
231 | fprintf (stderr, "Could not connect for playback: %s\n", pa_strerror (error_number)); | |
07c13dfd | 232 | return -1; |
ef79bbde P |
233 | } |
234 | ||
235 | // Run mainloop until stream is ready ///////////////////////////////////// | |
236 | pa_stream_state_t stream_state; | |
237 | stream_state = pa_stream_get_state (device.stream); | |
238 | while (stream_state != PA_STREAM_READY) | |
239 | { | |
240 | stream_state = pa_stream_get_state (device.stream); | |
241 | ||
242 | if (stream_state == PA_STREAM_READY) | |
243 | break; | |
244 | ||
245 | else if (! PA_STREAM_IS_GOOD (stream_state)) | |
246 | { | |
247 | error_number = pa_context_errno (device.context); | |
248 | fprintf (stderr, "Stream state is not good: %s\n", pa_strerror (error_number)); | |
07c13dfd | 249 | return -1; |
ef79bbde P |
250 | } |
251 | else | |
252 | fprintf (stderr, "PulseAudio stream state is %d\n", stream_state); | |
253 | pa_threaded_mainloop_wait (device.mainloop); | |
254 | } | |
255 | ||
256 | pa_threaded_mainloop_unlock (device.mainloop); | |
257 | ||
258 | fprintf (stderr, "PulseAudio should be connected\n"); | |
07c13dfd | 259 | return 0; |
ef79bbde P |
260 | } |
261 | ||
262 | //////////////////////////////////////////////////////////////////////// | |
263 | // REMOVE SOUND | |
264 | //////////////////////////////////////////////////////////////////////// | |
07c13dfd | 265 | static void pulse_finish(void) |
ef79bbde P |
266 | { |
267 | if (device.mainloop != NULL) | |
268 | pa_threaded_mainloop_stop (device.mainloop); | |
269 | ||
270 | // Release in reverse order of acquisition | |
271 | if (device.stream != NULL) | |
272 | { | |
273 | pa_stream_unref (device.stream); | |
274 | device.stream = NULL; | |
275 | ||
276 | } | |
277 | if (device.context != NULL) | |
278 | { | |
279 | pa_context_disconnect (device.context); | |
280 | pa_context_unref (device.context); | |
281 | device.context = NULL; | |
282 | } | |
283 | ||
284 | if (device.mainloop != NULL) | |
285 | { | |
286 | pa_threaded_mainloop_free (device.mainloop); | |
287 | device.mainloop = NULL; | |
288 | } | |
289 | ||
290 | } | |
291 | ||
292 | //////////////////////////////////////////////////////////////////////// | |
293 | // GET BYTES BUFFERED | |
294 | //////////////////////////////////////////////////////////////////////// | |
295 | ||
07c13dfd | 296 | static int pulse_busy(void) |
ef79bbde P |
297 | { |
298 | int free_space; | |
299 | int error_code; | |
300 | long latency; | |
301 | int playing = 0; | |
302 | ||
303 | if ((device.mainloop == NULL) || (device.api == NULL) || ( device.context == NULL) || (device.stream == NULL)) | |
f8edb5bc | 304 | return 1; |
ef79bbde P |
305 | |
306 | pa_threaded_mainloop_lock (device.mainloop); | |
307 | free_space = pa_stream_writable_size (device.stream); | |
308 | pa_threaded_mainloop_unlock (device.mainloop); | |
309 | ||
310 | //fprintf (stderr, "Free space: %d\n", free_space); | |
311 | //fprintf (stderr, "Used space: %d\n", maxlength - free_space); | |
312 | if (free_space < mixlen * 3) | |
313 | { | |
314 | // Don't buffer anymore, just play | |
315 | //fprintf (stderr, "Not buffering.\n"); | |
f8edb5bc | 316 | return 1; |
ef79bbde P |
317 | } |
318 | else | |
319 | { | |
320 | // Buffer some sound | |
321 | //fprintf (stderr, "Buffering.\n"); | |
322 | return 0; | |
323 | } | |
324 | } | |
325 | ||
326 | //////////////////////////////////////////////////////////////////////// | |
327 | // FEED SOUND DATA | |
328 | //////////////////////////////////////////////////////////////////////// | |
329 | ||
07c13dfd | 330 | static void pulse_feed(void *pSound, int lBytes) |
ef79bbde P |
331 | { |
332 | int error_code; | |
333 | int size; | |
334 | ||
335 | if (device.mainloop != NULL) | |
336 | { | |
337 | pa_threaded_mainloop_lock (device.mainloop); | |
338 | if (pa_stream_write (device.stream, pSound, lBytes, NULL, 0LL, PA_SEEK_RELATIVE) < 0) | |
339 | { | |
340 | fprintf (stderr, "Could not perform write\n"); | |
341 | } | |
342 | else | |
343 | { | |
344 | //fprintf (stderr, "Wrote %d bytes\n", lBytes); | |
345 | pa_threaded_mainloop_unlock (device.mainloop); | |
346 | } | |
347 | } | |
348 | } | |
07c13dfd | 349 | |
350 | void out_register_pulse(struct out_driver *drv) | |
351 | { | |
352 | drv->name = "pulseaudio"; | |
353 | drv->init = pulse_init; | |
354 | drv->finish = pulse_finish; | |
355 | drv->busy = pulse_busy; | |
356 | drv->feed = pulse_feed; | |
357 | } |