2 * Copyright (C) 2006 Andre Noll <maan@systemlinux.org>
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.
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.
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.
19 /** \file osx_write.c paraslash's output plugin for MacOs */
22 * based on mosx-mpg123, by Guillaume Outters and Steven A. Kortze
23 * <skortze@sourceforge.net>
26 #include <CoreAudio/CoreAudio.h>
33 #include "osx_write.cmdline.h"
37 #include <CoreAudio/CoreAudio.h>
38 #include <AudioUnit/AudioUnit.h>
39 #include <AudioToolbox/DefaultAudioOutput.h>
43 float *ptr; /* Where in the buffer are we? */
45 struct osx_buffer *next;
48 struct private_osx_write_data {
52 struct osx_buffer *from; /* Current buffers */
53 struct osx_buffer *to;
60 * Tried with 3 buffers, but then any little window move is sufficient to
61 * stop the sound (OK, on a G3 400 with a Public Beta. Perhaps now we can
62 * go down to 2 buffers). With 16 buffers we have 1.5 seconds music
63 * buffered (or, if you're pessimistic, 1.5 seconds latency). Note 0
64 * buffers don't work much further than the Bus error.
66 #define NUMBER_BUFFERS 2
68 static void destroy_buffers(struct private_osx_write_data *powd)
70 struct osx_buffer *ptr;
71 struct osx_buffer *ptr2;
73 powd->to->next = NULL;
82 static void init_buffers(struct private_osx_write_data *powd)
86 struct osx_buffer **ptrptr;
88 for (i = 0; i < NUMBER_BUFFERS; i++) {
89 *ptrptr = malloc(sizeof(struct osx_buffer));
91 (*ptrptr)->remaining = 0;
92 (*ptrptr)->buffer = NULL;
93 ptrptr = &(*ptrptr)->next;
95 *ptrptr = powd->from = powd->to;
98 static void fill_buffer(struct osx_buffer *b, short *source, long size)
102 if (b->remaining) /* Non empty buffer, must still be playing */
104 if (b->size != size) {
105 b->buffer = para_realloc(b->buffer, size * sizeof(float));
110 char *tmp = (char *)source;
114 /* *dest++ = ((*source++) + 32768) / 65536.0; */
115 *dest++ = (*source++) / 32768.0;
118 b->remaining = b->size;
121 static OSStatus osx_callback(void * inClientData,
122 __a_unused AudioUnitRenderActionFlags *inActionFlags,
123 __a_unused const AudioTimeStamp *inTimeStamp,
124 __a_unused UInt32 inBusNumber,
125 __a_unused UInt32 inNumFrames,
126 AudioBufferList *outOutputData)
131 struct private_osx_write_data *powd = inClientData;
133 // PARA_INFO_LOG("%p\n", powd);
134 for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
135 /* what we have to fill */
136 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
137 dest = outOutputData->mBuffers[i].mData;
139 if ((n = powd->from->remaining) <= 0) {
140 PARA_INFO_LOG("%s", "buffer underrun\n");
141 /* no more bytes in the current read buffer! */
142 while ((n = powd->from->remaining) <= 0)
143 /* wait for the results */
146 // PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
148 * we dump what we can. In fact, just the necessary
149 * should be sufficient
153 memcpy(dest, powd->from->ptr, n * sizeof(float));
155 /* remember all done work */
157 powd->from->ptr += n;
158 if ((powd->from->remaining -= n) <= 0)
159 powd->from = powd->from->next;
165 static int osx_write_open(struct writer_node *wn)
167 struct private_osx_write_data *powd = para_calloc(
168 sizeof(struct private_osx_write_data));
169 ComponentDescription desc;
171 AURenderCallbackStruct inputCallback = {osx_callback, powd};
172 AudioStreamBasicDescription format;
174 struct writer_node_group *wng = wn->wng;
175 struct osx_write_args_info *conf = wn->conf;
177 wn->private_data = powd;
178 /* where did that default audio output go? */
179 desc.componentType = kAudioUnitType_Output;
180 desc.componentSubType = kAudioUnitSubType_DefaultOutput;
181 /* NOTE: and if default output isn't Apple? */
182 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
183 desc.componentFlags = 0;
184 desc.componentFlagsMask = 0;
185 ret = -E_DEFAULT_COMP;
186 comp = FindNextComponent(NULL, &desc);
190 if (OpenAComponent(comp, &powd->output))
193 if (AudioUnitInitialize(powd->output))
197 /* Hmmm, let's choose PCM format */
198 /* We tell the Output Unit what format we're going to supply data to it.
199 * This is necessary if you're providing data through an input callback
200 * AND you want the DefaultOutputUnit to do any format conversions
201 * necessary from your format to the device's format.
203 if (!conf->samplerate_given && wng->samplerate)
204 powd->samplerate = *wng->samplerate;
206 powd->samplerate = conf->samplerate_arg;
207 format.mSampleRate = powd->samplerate;
208 /* The specific encoding type of audio stream*/
209 format.mFormatID = kAudioFormatLinearPCM;
210 /* flags specific to each format */
211 format.mFormatFlags = kLinearPCMFormatFlagIsFloat
212 | kLinearPCMFormatFlagIsPacked
213 | kLinearPCMFormatFlagIsBigEndian;
214 if (!conf->channels_given && wng->channels)
215 powd->channels = *wng->channels;
217 powd->channels = conf->channels_arg;
218 format.mChannelsPerFrame = powd->channels;
219 format.mFramesPerPacket = 1;
220 format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
221 format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
222 /* one of the most constant constants of the whole computer history */
223 format.mBitsPerChannel = sizeof(float) * 8;
224 ret = -E_STREAM_FORMAT;
225 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
226 kAudioUnitScope_Input, 0, &format,
227 sizeof(AudioStreamBasicDescription)))
230 ret = -E_ADD_CALLBACK;
231 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
232 kAudioUnitScope_Input, 0, &inputCallback,
233 sizeof(inputCallback)) < 0)
237 destroy_buffers(powd);
239 AudioUnitUninitialize(powd->output);
241 CloseComponent(powd->output);
246 __malloc void *osx_write_parse_config(char *options)
248 struct osx_write_args_info *conf
249 = para_calloc(sizeof(struct osx_write_args_info));
250 PARA_INFO_LOG("options: %s\n", options);
251 int ret = osx_cmdline_parser_string(options, conf, "osx_write");
261 static void osx_write_close(struct writer_node *wn)
263 struct private_osx_write_data *powd = wn->private_data;
265 PARA_INFO_LOG("closing writer node %p\n", wn);
266 AudioOutputUnitStop(powd->output);
267 AudioUnitUninitialize(powd->output);
268 CloseComponent(powd->output);
269 destroy_buffers(powd);
273 static int need_new_buffer(struct writer_node *wn)
275 struct writer_node_group *wng = wn->wng;
276 struct private_osx_write_data *powd = wn->private_data;
278 if (*wng->loaded < sizeof(short))
280 if (powd->to->remaining) /* Non empty buffer, must still be playing */
285 static int osx_write_post_select(__a_unused struct sched *s,
286 struct writer_node *wn)
288 struct private_osx_write_data *powd = wn->private_data;
289 struct writer_node_group *wng = wn->wng;
290 short *data = (short*)wng->buf;
292 if (!need_new_buffer(wn))
294 fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
295 powd->to = powd->to->next;
296 wn->written = *wng->loaded;
298 if (AudioOutputUnitStart(powd->output))
299 return -E_UNIT_START;
305 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
307 struct private_osx_write_data *powd = wn->private_data;
308 struct writer_node_group *wng = wn->wng;
309 size_t numbytes = powd->to->remaining * sizeof(short);
310 struct timeval tmp = {.tv_sec = 1, .tv_usec = 0}, delay = tmp;
311 unsigned long divisor;
313 if (!numbytes && *wng->loaded >= sizeof(short))
314 goto min_delay; /* there's a buffer to fill */
317 divisor = powd->samplerate * powd->channels * 2 / numbytes;
319 tv_divide(divisor, &tmp, &delay);
320 if (tv_diff(&s->timeout, &delay, NULL) > 0)
322 // PARA_DEBUG_LOG("delay: %lu:%lu\n", (long unsigned) s->timeout.tv_sec,
323 // (long unsigned) s->timeout.tv_usec);
326 PARA_DEBUG_LOG("%s\n", "minimal delay");
327 s->timeout.tv_sec = 0;
328 s->timeout.tv_usec = 1;
332 void osx_write_init(struct writer *w)
334 w->open = osx_write_open;
335 w->close = osx_write_close;
336 w->pre_select = osx_write_pre_select;
337 w->post_select = osx_write_post_select;
338 w->parse_config = osx_write_parse_config;
339 w->shutdown = NULL; /* nothing to do */