osx_write: kill superfluous semaphore code
[paraslash.git] / osx_writer.c
1 /*
2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file osx_writer.c paraslash's output plugin for MacOs */
20
21 #include <CoreAudio/CoreAudio.h>
22 #include "para.h"
23 #include "fd.h"
24 #include "string.h"
25 #include "list.h"
26 #include "sched.h"
27 #include "write.h"
28 #include "osx_write.cmdline.h"
29 #include "error.h"
30
31
32 #include <CoreAudio/CoreAudio.h>
33 #include <AudioUnit/AudioUnit.h>
34 #include <AudioToolbox/DefaultAudioOutput.h>
35 struct osx_buffer {
36 float *buffer;
37 long size;
38 float *ptr; /* Where in the buffer are we? */
39 long remaining;
40 struct osx_buffer *next;
41 };
42 typedef struct osx_buffer osx_buffer;
43
44 struct private_osx_writer_data {
45 long size;
46 short *ptr;
47 AudioUnit output;
48 char play;
49 osx_buffer *from; /* Current buffers */
50 osx_buffer *to;
51 unsigned samplerate;
52 unsigned channels;
53 };
54
55
56 /*
57 * Tried with 3 buffers, but then any little window move is sufficient to
58 * stop the sound (OK, on a G3 400 with a Public Beta. Perhaps now we can
59 * go down to 2 buffers). With 16 buffers we have 1.5 seconds music
60 * buffered (or, if you're pessimistic, 1.5 seconds latency). Note 0
61 * buffers don't work much further than the Bus error.
62 */
63 #define NUMBER_BUFFERS 2
64
65 static void destroy_buffers(struct private_osx_writer_data *powd)
66 {
67 osx_buffer *ptr;
68 osx_buffer *ptr2;
69 ptr = powd->to->next;
70 powd->to->next = NULL;
71 while (ptr) {
72 ptr2 = ptr->next;
73 if (ptr->buffer)
74 free(ptr->buffer);
75 free(ptr);
76 ptr = ptr2;
77 }
78 }
79
80 static void init_buffers(struct private_osx_writer_data *powd)
81 {
82 int i;
83
84 osx_buffer ** ptrptr;
85 ptrptr = &powd->to;
86 for (i = 0; i < NUMBER_BUFFERS; i++) {
87 *ptrptr = malloc(sizeof(osx_buffer));
88 (*ptrptr)->size = 0;
89 (*ptrptr)->remaining = 0;
90 (*ptrptr)->buffer = NULL;
91 ptrptr = &(*ptrptr)->next;
92 /* This buffer is ready for filling (of course, it is empty!) */
93 }
94 *ptrptr = powd->from = powd->to;
95 }
96
97 static void fill_buffer(osx_buffer *b, short *source, long size)
98 {
99 float *dest;
100
101 if (b->remaining) /* Non empty buffer, must still be playing */
102 return;
103 PARA_INFO_LOG("%ld\n", size);
104 if (b->size != size) {
105 /*
106 * Hey! What's that? Coudn't this buffer size be fixed
107 * once (well, perhaps we just didn't allocate it yet)
108 */
109 if (b->buffer)
110 free(b->buffer);
111 b->buffer = malloc(size * sizeof(float));
112 b->size = size;
113 }
114 dest = b->buffer;
115 while (size--) {
116 char *tmp = (char *)source;
117 char c = *tmp;
118 *tmp = *(tmp + 1);
119 *(tmp + 1) = c;
120 /* *dest++ = ((*source++) + 32768) / 65536.0; */
121 *dest++ = (*source++) / 32768.0;
122 }
123 b->ptr = b->buffer;
124 b->remaining = b->size;
125 }
126
127 static OSStatus osx_callback(void * inClientData,
128 __a_unused AudioUnitRenderActionFlags *inActionFlags,
129 __a_unused const AudioTimeStamp *inTimeStamp,
130 __a_unused UInt32 inBusNumber,
131 __a_unused UInt32 inNumFrames,
132 AudioBufferList *outOutputData)
133 {
134 long m, n;
135 float *dest;
136 int i;
137 struct private_osx_writer_data *powd = inClientData;
138
139 // PARA_INFO_LOG("%p\n", powd);
140 for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
141 /* what we have to fill */
142 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
143 dest = outOutputData->mBuffers[i].mData;
144 while (m > 0) {
145 if ((n = powd->from->remaining) <= 0) {
146 PARA_INFO_LOG("%s", "buffer underrun\n");
147 /* no more bytes in the current read buffer! */
148 while ((n = powd->from->remaining) <= 0)
149 /* wait for the results */
150 usleep(2000);
151 }
152 PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
153 /*
154 * we dump what we can. In fact, just the necessary
155 * should be sufficient
156 */
157 if (n > m)
158 n = m;
159 memcpy(dest, powd->from->ptr, n * sizeof(float));
160 dest += n;
161 /* remember all done work */
162 m -= n;
163 powd->from->ptr += n;
164 if ((powd->from->remaining -= n) <= 0)
165 powd->from = powd->from->next;
166 }
167 }
168 return 0;
169 }
170
171 static int osx_writer_open(struct writer_node *wn)
172 {
173 struct private_osx_writer_data *powd = para_calloc(
174 sizeof(struct private_osx_writer_data));
175 ComponentDescription desc;
176 Component comp;
177 AURenderCallbackStruct inputCallback = {osx_callback, powd};
178 AudioStreamBasicDescription format;
179 int ret;
180 struct writer_node_group *wng = wn->wng;
181 struct osx_write_args_info *conf = wn->conf;
182
183 wn->private_data = powd;
184 /* where did that default audio output go? */
185 desc.componentType = kAudioUnitType_Output;
186 desc.componentSubType = kAudioUnitSubType_DefaultOutput;
187 /* NOTE: and if default output isn't Apple? */
188 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
189 desc.componentFlags = 0;
190 desc.componentFlagsMask = 0;
191 ret = -E_DEFAULT_COMP;
192 comp = FindNextComponent(NULL, &desc);
193 if (!comp)
194 goto e0;
195 ret = -E_OPEN_COMP;
196 if (OpenAComponent(comp, &powd->output))
197 goto e0;
198 ret = -E_UNIT_INIT;
199 if (AudioUnitInitialize(powd->output))
200 goto e1;
201 powd->size = 0;
202 powd->ptr = NULL;
203 powd->play = 0;
204 /* Hmmm, let's choose PCM format */
205 /* We tell the Output Unit what format we're going to supply data to it.
206 * This is necessary if you're providing data through an input callback
207 * AND you want the DefaultOutputUnit to do any format conversions
208 * necessary from your format to the device's format.
209 */
210 if (!conf->samplerate_given && wng->samplerate)
211 powd->samplerate = *wng->samplerate;
212 else
213 powd->samplerate = conf->samplerate_arg;
214 format.mSampleRate = powd->samplerate;
215 /* The specific encoding type of audio stream*/
216 format.mFormatID = kAudioFormatLinearPCM;
217 /* flags specific to each format */
218 format.mFormatFlags = kLinearPCMFormatFlagIsFloat
219 | kLinearPCMFormatFlagIsPacked
220 | kLinearPCMFormatFlagIsBigEndian;
221 if (!conf->channels_given && wng->channels)
222 powd->channels = *wng->channels;
223 else
224 powd->channels = conf->channels_arg;
225 format.mChannelsPerFrame = powd->channels;
226 format.mFramesPerPacket = 1;
227 format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
228 format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
229 /* one of the most constant constants of the whole computer history */
230 format.mBitsPerChannel = sizeof(float) * 8;
231 ret = -E_STREAM_FORMAT;
232 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
233 kAudioUnitScope_Input, 0, &format,
234 sizeof(AudioStreamBasicDescription)))
235 goto e2;
236 init_buffers(powd);
237 ret = -E_ADD_CALLBACK;
238 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
239 kAudioUnitScope_Input, 0, &inputCallback,
240 sizeof(inputCallback)) < 0)
241 goto e3;
242 return 1;
243 e3:
244 destroy_buffers(powd);
245 e2:
246 AudioUnitUninitialize(powd->output);
247 e1:
248 CloseComponent(powd->output);
249 e0:
250 return ret;
251 }
252
253 __malloc void *osx_write_parse_config(char *options)
254 {
255 struct osx_write_args_info *conf
256 = para_calloc(sizeof(struct osx_write_args_info));
257 PARA_INFO_LOG("options: %s\n", options);
258 int ret = osx_cmdline_parser_string(options, conf, "osx_write");
259 if (ret)
260 goto err_out;
261 return conf;
262 err_out:
263 free(conf);
264 return NULL;
265
266 }
267
268 static void osx_writer_close(struct writer_node *wn)
269 {
270 struct private_osx_writer_data *powd = wn->private_data;
271
272 PARA_INFO_LOG("closing writer node %p\n", wn);
273 AudioOutputUnitStop(powd->output);
274 AudioUnitUninitialize(powd->output);
275 CloseComponent(powd->output);
276 destroy_buffers(powd);
277 free(powd);
278 }
279
280 static int need_new_buffer(struct writer_node *wn)
281 {
282 struct writer_node_group *wng = wn->wng;
283 struct private_osx_writer_data *powd = wn->private_data;
284
285 if (*wng->loaded < sizeof(short))
286 return 0;
287 if (powd->to->remaining) /* Non empty buffer, must still be playing */
288 return 0;
289 return 1;
290 }
291
292 static int osx_write_post_select(__a_unused struct sched *s,
293 struct writer_node *wn)
294 {
295 struct private_osx_writer_data *powd = wn->private_data;
296 struct writer_node_group *wng = wn->wng;
297 short *data = (short*)wng->buf;
298
299 if (!need_new_buffer(wn))
300 return 1;
301 fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
302 powd->to = powd->to->next;
303 wn->written = *wng->loaded;
304 if (!powd->play) {
305 if (AudioOutputUnitStart(powd->output))
306 return -1;
307 powd->play = 1;
308 }
309 return 1;
310 }
311
312 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
313 {
314 s->timeout.tv_sec = 0;
315 s->timeout.tv_usec = 20;
316 return 1;
317 }
318
319 void osx_writer_init(struct writer *w)
320 {
321 w->open = osx_writer_open;
322 w->close = osx_writer_close;
323 w->pre_select = osx_write_pre_select;
324 w->post_select = osx_write_post_select;
325 w->parse_config = osx_write_parse_config;
326 w->shutdown = NULL; /* nothing to do */
327 }