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[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 /*
22 * based on mosx-mpg123, by Guillaume Outters and Steven A. Kortze
23 * <skortze@sourceforge.net>
24 */
25
26 #include <CoreAudio/CoreAudio.h>
27 #include "para.h"
28 #include "fd.h"
29 #include "string.h"
30 #include "list.h"
31 #include "sched.h"
32 #include "write.h"
33 #include "osx_write.cmdline.h"
34 #include "error.h"
35
36
37 #include <CoreAudio/CoreAudio.h>
38 #include <AudioUnit/AudioUnit.h>
39 #include <AudioToolbox/DefaultAudioOutput.h>
40 struct osx_buffer {
41 float *buffer;
42 long size;
43 float *ptr; /* Where in the buffer are we? */
44 long remaining;
45 struct osx_buffer *next;
46 };
47 typedef struct osx_buffer osx_buffer;
48
49 struct private_osx_writer_data {
50 long size;
51 short *ptr;
52 AudioUnit output;
53 char play;
54 osx_buffer *from; /* Current buffers */
55 osx_buffer *to;
56 unsigned samplerate;
57 unsigned channels;
58 };
59
60
61 /*
62 * Tried with 3 buffers, but then any little window move is sufficient to
63 * stop the sound (OK, on a G3 400 with a Public Beta. Perhaps now we can
64 * go down to 2 buffers). With 16 buffers we have 1.5 seconds music
65 * buffered (or, if you're pessimistic, 1.5 seconds latency). Note 0
66 * buffers don't work much further than the Bus error.
67 */
68 #define NUMBER_BUFFERS 2
69
70 static void destroy_buffers(struct private_osx_writer_data *powd)
71 {
72 osx_buffer *ptr;
73 osx_buffer *ptr2;
74 ptr = powd->to->next;
75 powd->to->next = NULL;
76 while (ptr) {
77 ptr2 = ptr->next;
78 if (ptr->buffer)
79 free(ptr->buffer);
80 free(ptr);
81 ptr = ptr2;
82 }
83 }
84
85 static void init_buffers(struct private_osx_writer_data *powd)
86 {
87 int i;
88
89 osx_buffer ** ptrptr;
90 ptrptr = &powd->to;
91 for (i = 0; i < NUMBER_BUFFERS; i++) {
92 *ptrptr = malloc(sizeof(osx_buffer));
93 (*ptrptr)->size = 0;
94 (*ptrptr)->remaining = 0;
95 (*ptrptr)->buffer = NULL;
96 ptrptr = &(*ptrptr)->next;
97 /* This buffer is ready for filling (of course, it is empty!) */
98 }
99 *ptrptr = powd->from = powd->to;
100 }
101
102 static void fill_buffer(osx_buffer *b, short *source, long size)
103 {
104 float *dest;
105
106 if (b->remaining) /* Non empty buffer, must still be playing */
107 return;
108 PARA_INFO_LOG("%ld\n", size);
109 if (b->size != size) {
110 /*
111 * Hey! What's that? Coudn't this buffer size be fixed
112 * once (well, perhaps we just didn't allocate it yet)
113 */
114 if (b->buffer)
115 free(b->buffer);
116 b->buffer = malloc(size * sizeof(float));
117 b->size = size;
118 }
119 dest = b->buffer;
120 while (size--) {
121 char *tmp = (char *)source;
122 char c = *tmp;
123 *tmp = *(tmp + 1);
124 *(tmp + 1) = c;
125 /* *dest++ = ((*source++) + 32768) / 65536.0; */
126 *dest++ = (*source++) / 32768.0;
127 }
128 b->ptr = b->buffer;
129 b->remaining = b->size;
130 }
131
132 static OSStatus osx_callback(void * inClientData,
133 __a_unused AudioUnitRenderActionFlags *inActionFlags,
134 __a_unused const AudioTimeStamp *inTimeStamp,
135 __a_unused UInt32 inBusNumber,
136 __a_unused UInt32 inNumFrames,
137 AudioBufferList *outOutputData)
138 {
139 long m, n;
140 float *dest;
141 int i;
142 struct private_osx_writer_data *powd = inClientData;
143
144 // PARA_INFO_LOG("%p\n", powd);
145 for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
146 /* what we have to fill */
147 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
148 dest = outOutputData->mBuffers[i].mData;
149 while (m > 0) {
150 if ((n = powd->from->remaining) <= 0) {
151 PARA_INFO_LOG("%s", "buffer underrun\n");
152 /* no more bytes in the current read buffer! */
153 while ((n = powd->from->remaining) <= 0)
154 /* wait for the results */
155 usleep(2000);
156 }
157 PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
158 /*
159 * we dump what we can. In fact, just the necessary
160 * should be sufficient
161 */
162 if (n > m)
163 n = m;
164 memcpy(dest, powd->from->ptr, n * sizeof(float));
165 dest += n;
166 /* remember all done work */
167 m -= n;
168 powd->from->ptr += n;
169 if ((powd->from->remaining -= n) <= 0)
170 powd->from = powd->from->next;
171 }
172 }
173 return 0;
174 }
175
176 static int osx_writer_open(struct writer_node *wn)
177 {
178 struct private_osx_writer_data *powd = para_calloc(
179 sizeof(struct private_osx_writer_data));
180 ComponentDescription desc;
181 Component comp;
182 AURenderCallbackStruct inputCallback = {osx_callback, powd};
183 AudioStreamBasicDescription format;
184 int ret;
185 struct writer_node_group *wng = wn->wng;
186 struct osx_write_args_info *conf = wn->conf;
187
188 wn->private_data = powd;
189 /* where did that default audio output go? */
190 desc.componentType = kAudioUnitType_Output;
191 desc.componentSubType = kAudioUnitSubType_DefaultOutput;
192 /* NOTE: and if default output isn't Apple? */
193 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
194 desc.componentFlags = 0;
195 desc.componentFlagsMask = 0;
196 ret = -E_DEFAULT_COMP;
197 comp = FindNextComponent(NULL, &desc);
198 if (!comp)
199 goto e0;
200 ret = -E_OPEN_COMP;
201 if (OpenAComponent(comp, &powd->output))
202 goto e0;
203 ret = -E_UNIT_INIT;
204 if (AudioUnitInitialize(powd->output))
205 goto e1;
206 powd->size = 0;
207 powd->ptr = NULL;
208 powd->play = 0;
209 /* Hmmm, let's choose PCM format */
210 /* We tell the Output Unit what format we're going to supply data to it.
211 * This is necessary if you're providing data through an input callback
212 * AND you want the DefaultOutputUnit to do any format conversions
213 * necessary from your format to the device's format.
214 */
215 if (!conf->samplerate_given && wng->samplerate)
216 powd->samplerate = *wng->samplerate;
217 else
218 powd->samplerate = conf->samplerate_arg;
219 format.mSampleRate = powd->samplerate;
220 /* The specific encoding type of audio stream*/
221 format.mFormatID = kAudioFormatLinearPCM;
222 /* flags specific to each format */
223 format.mFormatFlags = kLinearPCMFormatFlagIsFloat
224 | kLinearPCMFormatFlagIsPacked
225 | kLinearPCMFormatFlagIsBigEndian;
226 if (!conf->channels_given && wng->channels)
227 powd->channels = *wng->channels;
228 else
229 powd->channels = conf->channels_arg;
230 format.mChannelsPerFrame = powd->channels;
231 format.mFramesPerPacket = 1;
232 format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
233 format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
234 /* one of the most constant constants of the whole computer history */
235 format.mBitsPerChannel = sizeof(float) * 8;
236 ret = -E_STREAM_FORMAT;
237 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
238 kAudioUnitScope_Input, 0, &format,
239 sizeof(AudioStreamBasicDescription)))
240 goto e2;
241 init_buffers(powd);
242 ret = -E_ADD_CALLBACK;
243 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
244 kAudioUnitScope_Input, 0, &inputCallback,
245 sizeof(inputCallback)) < 0)
246 goto e3;
247 return 1;
248 e3:
249 destroy_buffers(powd);
250 e2:
251 AudioUnitUninitialize(powd->output);
252 e1:
253 CloseComponent(powd->output);
254 e0:
255 return ret;
256 }
257
258 __malloc void *osx_write_parse_config(char *options)
259 {
260 struct osx_write_args_info *conf
261 = para_calloc(sizeof(struct osx_write_args_info));
262 PARA_INFO_LOG("options: %s\n", options);
263 int ret = osx_cmdline_parser_string(options, conf, "osx_write");
264 if (ret)
265 goto err_out;
266 return conf;
267 err_out:
268 free(conf);
269 return NULL;
270
271 }
272
273 static void osx_writer_close(struct writer_node *wn)
274 {
275 struct private_osx_writer_data *powd = wn->private_data;
276
277 PARA_INFO_LOG("closing writer node %p\n", wn);
278 AudioOutputUnitStop(powd->output);
279 AudioUnitUninitialize(powd->output);
280 CloseComponent(powd->output);
281 destroy_buffers(powd);
282 free(powd);
283 }
284
285 static int need_new_buffer(struct writer_node *wn)
286 {
287 struct writer_node_group *wng = wn->wng;
288 struct private_osx_writer_data *powd = wn->private_data;
289
290 if (*wng->loaded < sizeof(short))
291 return 0;
292 if (powd->to->remaining) /* Non empty buffer, must still be playing */
293 return 0;
294 return 1;
295 }
296
297 static int osx_write_post_select(__a_unused struct sched *s,
298 struct writer_node *wn)
299 {
300 struct private_osx_writer_data *powd = wn->private_data;
301 struct writer_node_group *wng = wn->wng;
302 short *data = (short*)wng->buf;
303
304 if (!need_new_buffer(wn))
305 return 1;
306 fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
307 powd->to = powd->to->next;
308 wn->written = *wng->loaded;
309 if (!powd->play) {
310 if (AudioOutputUnitStart(powd->output))
311 return -1;
312 powd->play = 1;
313 }
314 return 1;
315 }
316
317 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
318 {
319 s->timeout.tv_sec = 0;
320 s->timeout.tv_usec = 20;
321 return 1;
322 }
323
324 void osx_writer_init(struct writer *w)
325 {
326 w->open = osx_writer_open;
327 w->close = osx_writer_close;
328 w->pre_select = osx_write_pre_select;
329 w->post_select = osx_write_post_select;
330 w->parse_config = osx_write_parse_config;
331 w->shutdown = NULL; /* nothing to do */
332 }