39af500077a939a28109e7535868560487f63b1d
[paraslash.git] / osx_write.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_write.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_write_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_write_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 free(ptr->buffer);
79 free(ptr);
80 ptr = ptr2;
81 }
82 }
83
84 static void init_buffers(struct private_osx_write_data *powd)
85 {
86 int i;
87
88 osx_buffer ** ptrptr;
89 ptrptr = &powd->to;
90 for (i = 0; i < NUMBER_BUFFERS; i++) {
91 *ptrptr = malloc(sizeof(osx_buffer));
92 (*ptrptr)->size = 0;
93 (*ptrptr)->remaining = 0;
94 (*ptrptr)->buffer = NULL;
95 ptrptr = &(*ptrptr)->next;
96 }
97 *ptrptr = powd->from = powd->to;
98 }
99
100 static void fill_buffer(osx_buffer *b, short *source, long size)
101 {
102 float *dest;
103
104 if (b->remaining) /* Non empty buffer, must still be playing */
105 return;
106 PARA_INFO_LOG("%ld\n", size);
107 if (b->size != size) {
108 b->buffer = para_realloc(b->buffer, size * sizeof(float));
109 b->size = size;
110 }
111 dest = b->buffer;
112 while (size--) {
113 char *tmp = (char *)source;
114 char c = *tmp;
115 *tmp = *(tmp + 1);
116 *(tmp + 1) = c;
117 /* *dest++ = ((*source++) + 32768) / 65536.0; */
118 *dest++ = (*source++) / 32768.0;
119 }
120 b->ptr = b->buffer;
121 b->remaining = b->size;
122 }
123
124 static OSStatus osx_callback(void * inClientData,
125 __a_unused AudioUnitRenderActionFlags *inActionFlags,
126 __a_unused const AudioTimeStamp *inTimeStamp,
127 __a_unused UInt32 inBusNumber,
128 __a_unused UInt32 inNumFrames,
129 AudioBufferList *outOutputData)
130 {
131 long m, n;
132 float *dest;
133 int i;
134 struct private_osx_write_data *powd = inClientData;
135
136 // PARA_INFO_LOG("%p\n", powd);
137 for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
138 /* what we have to fill */
139 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
140 dest = outOutputData->mBuffers[i].mData;
141 while (m > 0) {
142 if ((n = powd->from->remaining) <= 0) {
143 PARA_INFO_LOG("%s", "buffer underrun\n");
144 /* no more bytes in the current read buffer! */
145 while ((n = powd->from->remaining) <= 0)
146 /* wait for the results */
147 usleep(2000);
148 }
149 PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
150 /*
151 * we dump what we can. In fact, just the necessary
152 * should be sufficient
153 */
154 if (n > m)
155 n = m;
156 memcpy(dest, powd->from->ptr, n * sizeof(float));
157 dest += n;
158 /* remember all done work */
159 m -= n;
160 powd->from->ptr += n;
161 if ((powd->from->remaining -= n) <= 0)
162 powd->from = powd->from->next;
163 }
164 }
165 return 0;
166 }
167
168 static int osx_write_open(struct writer_node *wn)
169 {
170 struct private_osx_write_data *powd = para_calloc(
171 sizeof(struct private_osx_write_data));
172 ComponentDescription desc;
173 Component comp;
174 AURenderCallbackStruct inputCallback = {osx_callback, powd};
175 AudioStreamBasicDescription format;
176 int ret;
177 struct writer_node_group *wng = wn->wng;
178 struct osx_write_args_info *conf = wn->conf;
179
180 wn->private_data = powd;
181 /* where did that default audio output go? */
182 desc.componentType = kAudioUnitType_Output;
183 desc.componentSubType = kAudioUnitSubType_DefaultOutput;
184 /* NOTE: and if default output isn't Apple? */
185 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
186 desc.componentFlags = 0;
187 desc.componentFlagsMask = 0;
188 ret = -E_DEFAULT_COMP;
189 comp = FindNextComponent(NULL, &desc);
190 if (!comp)
191 goto e0;
192 ret = -E_OPEN_COMP;
193 if (OpenAComponent(comp, &powd->output))
194 goto e0;
195 ret = -E_UNIT_INIT;
196 if (AudioUnitInitialize(powd->output))
197 goto e1;
198 powd->size = 0;
199 powd->ptr = NULL;
200 powd->play = 0;
201 /* Hmmm, let's choose PCM format */
202 /* We tell the Output Unit what format we're going to supply data to it.
203 * This is necessary if you're providing data through an input callback
204 * AND you want the DefaultOutputUnit to do any format conversions
205 * necessary from your format to the device's format.
206 */
207 if (!conf->samplerate_given && wng->samplerate)
208 powd->samplerate = *wng->samplerate;
209 else
210 powd->samplerate = conf->samplerate_arg;
211 format.mSampleRate = powd->samplerate;
212 /* The specific encoding type of audio stream*/
213 format.mFormatID = kAudioFormatLinearPCM;
214 /* flags specific to each format */
215 format.mFormatFlags = kLinearPCMFormatFlagIsFloat
216 | kLinearPCMFormatFlagIsPacked
217 | kLinearPCMFormatFlagIsBigEndian;
218 if (!conf->channels_given && wng->channels)
219 powd->channels = *wng->channels;
220 else
221 powd->channels = conf->channels_arg;
222 format.mChannelsPerFrame = powd->channels;
223 format.mFramesPerPacket = 1;
224 format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
225 format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
226 /* one of the most constant constants of the whole computer history */
227 format.mBitsPerChannel = sizeof(float) * 8;
228 ret = -E_STREAM_FORMAT;
229 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
230 kAudioUnitScope_Input, 0, &format,
231 sizeof(AudioStreamBasicDescription)))
232 goto e2;
233 init_buffers(powd);
234 ret = -E_ADD_CALLBACK;
235 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
236 kAudioUnitScope_Input, 0, &inputCallback,
237 sizeof(inputCallback)) < 0)
238 goto e3;
239 return 1;
240 e3:
241 destroy_buffers(powd);
242 e2:
243 AudioUnitUninitialize(powd->output);
244 e1:
245 CloseComponent(powd->output);
246 e0:
247 return ret;
248 }
249
250 __malloc void *osx_write_parse_config(char *options)
251 {
252 struct osx_write_args_info *conf
253 = para_calloc(sizeof(struct osx_write_args_info));
254 PARA_INFO_LOG("options: %s\n", options);
255 int ret = osx_cmdline_parser_string(options, conf, "osx_write");
256 if (ret)
257 goto err_out;
258 return conf;
259 err_out:
260 free(conf);
261 return NULL;
262
263 }
264
265 static void osx_write_close(struct writer_node *wn)
266 {
267 struct private_osx_write_data *powd = wn->private_data;
268
269 PARA_INFO_LOG("closing writer node %p\n", wn);
270 AudioOutputUnitStop(powd->output);
271 AudioUnitUninitialize(powd->output);
272 CloseComponent(powd->output);
273 destroy_buffers(powd);
274 free(powd);
275 }
276
277 static int need_new_buffer(struct writer_node *wn)
278 {
279 struct writer_node_group *wng = wn->wng;
280 struct private_osx_write_data *powd = wn->private_data;
281
282 if (*wng->loaded < sizeof(short))
283 return 0;
284 if (powd->to->remaining) /* Non empty buffer, must still be playing */
285 return 0;
286 return 1;
287 }
288
289 static int osx_write_post_select(__a_unused struct sched *s,
290 struct writer_node *wn)
291 {
292 struct private_osx_write_data *powd = wn->private_data;
293 struct writer_node_group *wng = wn->wng;
294 short *data = (short*)wng->buf;
295
296 if (!need_new_buffer(wn))
297 return 1;
298 fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
299 powd->to = powd->to->next;
300 wn->written = *wng->loaded;
301 if (!powd->play) {
302 if (AudioOutputUnitStart(powd->output))
303 return -E_UNIT_START;
304 powd->play = 1;
305 }
306 return 1;
307 }
308
309 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
310 {
311 s->timeout.tv_sec = 0;
312 s->timeout.tv_usec = 20;
313 return 1;
314 }
315
316 void osx_write_init(struct writer *w)
317 {
318 w->open = osx_write_open;
319 w->close = osx_write_close;
320 w->pre_select = osx_write_pre_select;
321 w->post_select = osx_write_post_select;
322 w->parse_config = osx_write_parse_config;
323 w->shutdown = NULL; /* nothing to do */
324 }