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_writer.c paraslash's output plugin for MacOs */
21 #include <CoreAudio/CoreAudio.h>
28 #include "osx_write.cmdline.h"
32 #include <CoreAudio/CoreAudio.h>
33 #include <AudioUnit/AudioUnit.h>
34 #include <AudioToolbox/DefaultAudioOutput.h>
35 #include <semaphore.h>
39 float *ptr; /* Where in the buffer are we? */
41 struct osx_buffer *next;
43 typedef struct osx_buffer osx_buffer;
45 struct private_osx_writer_data {
51 osx_buffer *from; /* Current buffers */
58 * Tried with 3 buffers, but then any little window move is sufficient to
59 * stop the sound (OK, on a G3 400 with a Public Beta. Perhaps now we can
60 * go down to 2 buffers). With 16 buffers we have 1.5 seconds music
61 * buffered (or, if you're pessimistic, 1.5 seconds latency). Note 0
62 * buffers don't work much further than the Bus error.
64 #define NUMBER_BUFFERS 2
66 static void destroy_buffers(struct private_osx_writer_data *powd)
71 powd->to->next = NULL;
81 static void init_buffers(struct private_osx_writer_data *powd)
87 for (i = 0; i < NUMBER_BUFFERS; i++) {
88 *ptrptr = malloc(sizeof(osx_buffer));
90 (*ptrptr)->remaining = 0;
91 (*ptrptr)->buffer = NULL;
92 ptrptr = &(*ptrptr)->next;
93 /* This buffer is ready for filling (of course, it is empty!) */
94 sem_post(powd->semaphore);
96 *ptrptr = powd->from = powd->to;
99 static void fill_buffer(osx_buffer *b, short *source, long size)
103 if (b->remaining) /* Non empty buffer, must still be playing */
105 PARA_INFO_LOG("%ld\n", size);
106 if (b->size != size) {
108 * Hey! What's that? Coudn't this buffer size be fixed
109 * once (well, perhaps we just didn't allocate it yet)
113 b->buffer = malloc(size * sizeof(float));
118 char *tmp = (char *)source;
122 /* *dest++ = ((*source++) + 32768) / 65536.0; */
123 *dest++ = (*source++) / 32768.0;
126 b->remaining = b->size;
129 static OSStatus osx_callback(void * inClientData,
130 __a_unused AudioUnitRenderActionFlags *inActionFlags,
131 __a_unused const AudioTimeStamp *inTimeStamp,
132 __a_unused UInt32 inBusNumber,
133 __a_unused UInt32 inNumFrames,
134 AudioBufferList *outOutputData)
139 struct private_osx_writer_data *powd = inClientData;
141 // PARA_INFO_LOG("%p\n", powd);
142 for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
143 /* what we have to fill */
144 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
145 dest = outOutputData->mBuffers[i].mData;
147 if ((n = powd->from->remaining) <= 0) {
148 /* no more bytes in the current read buffer! */
149 while ((n = powd->from->remaining) <= 0)
150 /* wait for the results */
153 PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
155 * we dump what we can. In fact, just the necessary
156 * should be sufficient
160 memcpy(dest, powd->from->ptr, n * sizeof(float));
162 /* remember all done work */
164 powd->from->ptr += n;
165 if ((powd->from->remaining -= n) <= 0) {
166 /* tell that there's a buffer to fill */
167 sem_post(powd->semaphore);
168 powd->from = powd->from->next;
175 static int osx_writer_open(struct writer_node *wn)
177 struct private_osx_writer_data *powd = para_calloc(
178 sizeof(struct private_osx_writer_data));
179 ComponentDescription desc;
181 AURenderCallbackStruct inputCallback = {osx_callback, powd};
182 AudioStreamBasicDescription format;
185 struct writer_node_group *wng = wn->wng;
186 struct osx_write_args_info *conf = wn->conf;
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);
201 if (OpenAComponent(comp, &powd->output))
204 if (AudioUnitInitialize(powd->output))
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.
215 if (!conf->samplerate_given && wng->samplerate)
216 powd->samplerate = *wng->samplerate;
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;
227 * We produce 2-channel audio. Now if we have a mega-super-hyper card for our
228 * audio, it is its problem to convert it to 8-, 16-, 32- or 1024-channel data.
230 format.mBytesPerFrame = (format.mFramesPerPacket = 1)
231 * (format.mBytesPerPacket = (format.mChannelsPerFrame = 2) * sizeof(float));
232 /* one of the most constant constants of the whole computer history */
233 format.mBitsPerChannel = sizeof(float) * 8;
234 ret = -E_STREAM_FORMAT;
235 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
236 kAudioUnitScope_Input, 0, &format,
237 sizeof(AudioStreamBasicDescription)))
239 /* init the semaphore */
240 strcpy(s, "/mpg123-0000");
247 } while ((powd->semaphore = sem_open(s, O_CREAT | O_EXCL, 0644, 0))
248 == (sem_t *)SEM_FAILED);
250 ret = -E_ADD_CALLBACK;
251 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
252 kAudioUnitScope_Input, 0, &inputCallback,
253 sizeof(inputCallback)) < 0)
257 destroy_buffers(powd);
259 AudioUnitUninitialize(powd->output);
261 CloseComponent(powd->output);
266 __malloc void *osx_write_parse_config(char *options)
268 struct osx_write_args_info *conf
269 = para_calloc(sizeof(struct osx_write_args_info));
270 PARA_INFO_LOG("options: %s\n", options);
271 int ret = osx_cmdline_parser_string(options, conf, "osx_write");
281 static void osx_writer_close(struct writer_node *wn)
283 struct private_osx_writer_data *powd = wn->private_data;
285 PARA_INFO_LOG("closing writer node %p\n", wn);
286 AudioOutputUnitStop(powd->output);
287 AudioUnitUninitialize(powd->output);
288 CloseComponent(powd->output);
289 destroy_buffers(powd);
290 sem_close(powd->semaphore);
294 static int need_new_buffer(struct writer_node *wn)
296 struct writer_node_group *wng = wn->wng;
297 struct private_osx_writer_data *powd = wn->private_data;
299 if (*wng->loaded < sizeof(short))
301 if (powd->to->remaining) /* Non empty buffer, must still be playing */
306 static int osx_write_post_select(__a_unused struct sched *s,
307 struct writer_node *wn)
309 struct private_osx_writer_data *powd = wn->private_data;
310 struct writer_node_group *wng = wn->wng;
311 short *data = (short*)wng->buf;
313 if (!need_new_buffer(wn))
315 fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
316 powd->to = powd->to->next;
317 wn->written = *wng->loaded;
319 if (AudioOutputUnitStart(powd->output))
326 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
328 s->timeout.tv_sec = 0;
329 s->timeout.tv_usec = 20;
333 void osx_writer_init(struct writer *w)
335 w->open = osx_writer_open;
336 w->close = osx_writer_close;
337 w->pre_select = osx_write_pre_select;
338 w->post_select = osx_write_post_select;
339 w->parse_config = osx_write_parse_config;
340 w->shutdown = NULL; /* nothing to do */