osx_writer: swap bytes.
[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 #include <semaphore.h>
36 struct osx_buffer {
37 float *buffer;
38 long size;
39 float *ptr; /* Where in the buffer are we? */
40 long remaining;
41 struct osx_buffer *next;
42 };
43 typedef struct osx_buffer osx_buffer;
44
45 struct private_osx_writer_data {
46 long size;
47 short *ptr;
48 AudioUnit output;
49 char play;
50 sem_t *semaphore;
51 osx_buffer *from; /* Current buffers */
52 osx_buffer *to;
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 sem_post(powd->semaphore);
94 }
95 *ptrptr = powd->from = powd->to;
96 }
97
98 static void fill_buffer(osx_buffer *b, short *source, long size)
99 {
100 float *dest;
101
102 if (b->remaining) /* Non empty buffer, must still be playing */
103 return;
104 PARA_INFO_LOG("%ld\n", size);
105 if (b->size != size) {
106 /*
107 * Hey! What's that? Coudn't this buffer size be fixed
108 * once (well, perhaps we just didn't allocate it yet)
109 */
110 if (b->buffer)
111 free(b->buffer);
112 b->buffer = malloc(size * sizeof(float));
113 b->size = size;
114 }
115 dest = b->buffer;
116 while (size--) {
117 char *tmp = (char *)source;
118 char c = *tmp;
119 *tmp = *(tmp + 1);
120 *(tmp + 1) = c;
121 /* *dest++ = ((*source++) + 32768) / 65536.0; */
122 *dest++ = (*source++) / 32768.0;
123 }
124 b->ptr = b->buffer;
125 b->remaining = b->size;
126 }
127
128 static OSStatus osx_callback(void * inClientData,
129 __a_unused AudioUnitRenderActionFlags *inActionFlags,
130 __a_unused const AudioTimeStamp *inTimeStamp,
131 __a_unused UInt32 inBusNumber,
132 __a_unused UInt32 inNumFrames,
133 AudioBufferList *outOutputData)
134 {
135 long m, n;
136 float *dest;
137 int i;
138 struct private_osx_writer_data *powd = inClientData;
139
140 // PARA_INFO_LOG("%p\n", powd);
141 for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
142 /* what we have to fill */
143 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
144 dest = outOutputData->mBuffers[i].mData;
145 while (m > 0) {
146 if ((n = powd->from->remaining) <= 0) {
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 /* tell that there's a buffer to fill */
166 sem_post(powd->semaphore);
167 powd->from = powd->from->next;
168 }
169 }
170 }
171 return 0;
172 }
173
174 static int osx_writer_open(struct writer_node *wn)
175 {
176 struct private_osx_writer_data *powd = para_calloc(
177 sizeof(struct private_osx_writer_data));
178 ComponentDescription desc;
179 Component comp;
180 AURenderCallbackStruct inputCallback = {osx_callback, powd};
181 AudioStreamBasicDescription format;
182 char s[10];
183 int m, ret;
184
185 wn->private_data = powd;
186 /* where did that default audio output go? */
187 desc.componentType = kAudioUnitType_Output;
188 desc.componentSubType = kAudioUnitSubType_DefaultOutput;
189 /* NOTE: and if default output isn't Apple? */
190 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
191 desc.componentFlags = 0;
192 desc.componentFlagsMask = 0;
193 ret = -E_DEFAULT_COMP;
194 comp = FindNextComponent(NULL, &desc);
195 if (!comp)
196 goto e0;
197 ret = -E_OPEN_COMP;
198 if (OpenAComponent(comp, &powd->output))
199 goto e0;
200 ret = -E_UNIT_INIT;
201 if (AudioUnitInitialize(powd->output))
202 goto e1;
203 powd->size = 0;
204 powd->ptr = NULL;
205 powd->play = 0;
206 /* Hmmm, let's choose PCM format */
207 /* We tell the Output Unit what format we're going to supply data to it.
208 * This is necessary if you're providing data through an input callback
209 * AND you want the DefaultOutputUnit to do any format conversions
210 * necessary from your format to the device's format.
211 */
212 format.mSampleRate = 44100.0; /* The sample rate of the audio stream */
213 /* The specific encoding type of audio stream*/
214 format.mFormatID = kAudioFormatLinearPCM;
215 /* flags specific to each format */
216 format.mFormatFlags = kLinearPCMFormatFlagIsFloat
217 | kLinearPCMFormatFlagIsPacked
218 | kLinearPCMFormatFlagIsBigEndian;
219 /*
220 * We produce 2-channel audio. Now if we have a mega-super-hyper card for our
221 * audio, it is its problem to convert it to 8-, 16-, 32- or 1024-channel data.
222 */
223 format.mBytesPerFrame = (format.mFramesPerPacket = 1)
224 * (format.mBytesPerPacket = (format.mChannelsPerFrame = 2) * sizeof(float));
225 /* one of the most constant constants of the whole computer history */
226 format.mBitsPerChannel = sizeof(float) * 8;
227 ret = -E_STREAM_FORMAT;
228 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
229 kAudioUnitScope_Input, 0, &format,
230 sizeof(AudioStreamBasicDescription)))
231 goto e2;
232 /* init the semaphore */
233 strcpy(s, "/mpg123-0000");
234 do {
235 for (m = 10;; m--)
236 if( (s[m]++) <= '9')
237 break;
238 else
239 s[m] = '0';
240 } while ((powd->semaphore = sem_open(s, O_CREAT | O_EXCL, 0644, 0))
241 == (sem_t *)SEM_FAILED);
242 init_buffers(powd);
243 ret = -E_ADD_CALLBACK;
244 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
245 kAudioUnitScope_Input, 0, &inputCallback,
246 sizeof(inputCallback)) < 0)
247 goto e3;
248 return 1;
249 e3:
250 destroy_buffers(powd);
251 e2:
252 AudioUnitUninitialize(powd->output);
253 e1:
254 CloseComponent(powd->output);
255 e0:
256 return ret;
257 }
258
259 __malloc void *osx_write_parse_config(char *options)
260 {
261 struct osx_write_args_info *conf
262 = para_calloc(sizeof(struct osx_write_args_info));
263 PARA_INFO_LOG("options: %s\n", options);
264 int ret = osx_cmdline_parser_string(options, conf, "osx_write");
265 if (ret)
266 goto err_out;
267 return conf;
268 err_out:
269 free(conf);
270 return NULL;
271
272 }
273
274 static void osx_writer_close(struct writer_node *wn)
275 {
276 struct private_osx_writer_data *powd = wn->private_data;
277
278 PARA_INFO_LOG("closing writer node %p\n", wn);
279 AudioOutputUnitStop(powd->output);
280 AudioUnitUninitialize(powd->output);
281 CloseComponent(powd->output);
282 destroy_buffers(powd);
283 sem_close(powd->semaphore);
284 free(powd);
285 }
286
287 static int osx_write_post_select(__a_unused struct sched *s,
288 struct writer_node *wn)
289 {
290 struct private_osx_writer_data *powd = wn->private_data;
291 struct writer_node_group *wng = wn->wng;
292 short *data = (short*)wng->buf + wn->written;
293
294 if (*wng->loaded <= wn->written)
295 return 1;
296 if (powd->to->remaining) /* Non empty buffer, must still be playing */
297 return 1;
298 fill_buffer(powd->to, data, (*wng->loaded - wn->written) / sizeof(short));
299 powd->to = powd->to->next;
300 wn->written += (*wng->loaded - wn->written);
301 if (!powd->play) {
302 if (AudioOutputUnitStart(powd->output))
303 return -1;
304 powd->play = 1;
305 }
306 return 1;
307 }
308
309 static int osx_write_pre_select(struct sched *s, struct writer_node *wn)
310 {
311 struct writer_node_group *wng = wn->wng;
312 struct private_osx_writer_data *powd = wn->private_data;
313
314 // if (!*wng->loaded)
315 // return 1;
316 // if (powd->to->remaining) /* Non empty buffer, must still be playing */
317 // return 1;
318 s->timeout.tv_sec = 0;
319 s->timeout.tv_usec = 20;
320 return 1;
321 }
322
323 void osx_writer_init(struct writer *w)
324 {
325 w->open = osx_writer_open;
326 w->close = osx_writer_close;
327 w->pre_select = osx_write_pre_select;
328 w->post_select = osx_write_post_select;
329 w->parse_config = osx_write_parse_config;
330 w->shutdown = NULL; /* nothing to do */
331 }