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>
38 float *ptr; /* Where in the buffer are we? */
40 struct osx_buffer *next;
42 typedef struct osx_buffer osx_buffer;
44 struct private_osx_writer_data {
49 osx_buffer *from; /* Current buffers */
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.
63 #define NUMBER_BUFFERS 2
65 static void destroy_buffers(struct private_osx_writer_data *powd)
70 powd->to->next = NULL;
80 static void init_buffers(struct private_osx_writer_data *powd)
86 for (i = 0; i < NUMBER_BUFFERS; i++) {
87 *ptrptr = malloc(sizeof(osx_buffer));
89 (*ptrptr)->remaining = 0;
90 (*ptrptr)->buffer = NULL;
91 ptrptr = &(*ptrptr)->next;
92 /* This buffer is ready for filling (of course, it is empty!) */
94 *ptrptr = powd->from = powd->to;
97 static void fill_buffer(osx_buffer *b, short *source, long size)
101 if (b->remaining) /* Non empty buffer, must still be playing */
103 PARA_INFO_LOG("%ld\n", size);
104 if (b->size != size) {
106 * Hey! What's that? Coudn't this buffer size be fixed
107 * once (well, perhaps we just didn't allocate it yet)
111 b->buffer = malloc(size * sizeof(float));
116 char *tmp = (char *)source;
120 /* *dest++ = ((*source++) + 32768) / 65536.0; */
121 *dest++ = (*source++) / 32768.0;
124 b->remaining = b->size;
127 static OSStatus osx_callback(void * inClientData,
128 __a_unused AudioUnitRenderActionFlags *inActionFlags,
129 __a_unused const AudioTimeStamp *inTimeStamp,
130 __a_unused UInt32 inBusNumber,
131 __a_unused UInt32 inNumFrames,
132 AudioBufferList *outOutputData)
137 struct private_osx_writer_data *powd = inClientData;
139 // PARA_INFO_LOG("%p\n", powd);
140 for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
141 /* what we have to fill */
142 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
143 dest = outOutputData->mBuffers[i].mData;
145 if ((n = powd->from->remaining) <= 0) {
146 PARA_INFO_LOG("%s", "buffer underrun\n");
147 /* no more bytes in the current read buffer! */
148 while ((n = powd->from->remaining) <= 0)
149 /* wait for the results */
152 PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
154 * we dump what we can. In fact, just the necessary
155 * should be sufficient
159 memcpy(dest, powd->from->ptr, n * sizeof(float));
161 /* remember all done work */
163 powd->from->ptr += n;
164 if ((powd->from->remaining -= n) <= 0)
165 powd->from = powd->from->next;
171 static int osx_writer_open(struct writer_node *wn)
173 struct private_osx_writer_data *powd = para_calloc(
174 sizeof(struct private_osx_writer_data));
175 ComponentDescription desc;
177 AURenderCallbackStruct inputCallback = {osx_callback, powd};
178 AudioStreamBasicDescription format;
180 struct writer_node_group *wng = wn->wng;
181 struct osx_write_args_info *conf = wn->conf;
183 wn->private_data = powd;
184 /* where did that default audio output go? */
185 desc.componentType = kAudioUnitType_Output;
186 desc.componentSubType = kAudioUnitSubType_DefaultOutput;
187 /* NOTE: and if default output isn't Apple? */
188 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
189 desc.componentFlags = 0;
190 desc.componentFlagsMask = 0;
191 ret = -E_DEFAULT_COMP;
192 comp = FindNextComponent(NULL, &desc);
196 if (OpenAComponent(comp, &powd->output))
199 if (AudioUnitInitialize(powd->output))
204 /* Hmmm, let's choose PCM format */
205 /* We tell the Output Unit what format we're going to supply data to it.
206 * This is necessary if you're providing data through an input callback
207 * AND you want the DefaultOutputUnit to do any format conversions
208 * necessary from your format to the device's format.
210 if (!conf->samplerate_given && wng->samplerate)
211 powd->samplerate = *wng->samplerate;
213 powd->samplerate = conf->samplerate_arg;
214 format.mSampleRate = powd->samplerate;
215 /* The specific encoding type of audio stream*/
216 format.mFormatID = kAudioFormatLinearPCM;
217 /* flags specific to each format */
218 format.mFormatFlags = kLinearPCMFormatFlagIsFloat
219 | kLinearPCMFormatFlagIsPacked
220 | kLinearPCMFormatFlagIsBigEndian;
221 if (!conf->channels_given && wng->channels)
222 powd->channels = *wng->channels;
224 powd->channels = conf->channels_arg;
225 format.mChannelsPerFrame = powd->channels;
226 format.mFramesPerPacket = 1;
227 format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
228 format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
229 /* one of the most constant constants of the whole computer history */
230 format.mBitsPerChannel = sizeof(float) * 8;
231 ret = -E_STREAM_FORMAT;
232 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
233 kAudioUnitScope_Input, 0, &format,
234 sizeof(AudioStreamBasicDescription)))
237 ret = -E_ADD_CALLBACK;
238 if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
239 kAudioUnitScope_Input, 0, &inputCallback,
240 sizeof(inputCallback)) < 0)
244 destroy_buffers(powd);
246 AudioUnitUninitialize(powd->output);
248 CloseComponent(powd->output);
253 __malloc void *osx_write_parse_config(char *options)
255 struct osx_write_args_info *conf
256 = para_calloc(sizeof(struct osx_write_args_info));
257 PARA_INFO_LOG("options: %s\n", options);
258 int ret = osx_cmdline_parser_string(options, conf, "osx_write");
268 static void osx_writer_close(struct writer_node *wn)
270 struct private_osx_writer_data *powd = wn->private_data;
272 PARA_INFO_LOG("closing writer node %p\n", wn);
273 AudioOutputUnitStop(powd->output);
274 AudioUnitUninitialize(powd->output);
275 CloseComponent(powd->output);
276 destroy_buffers(powd);
280 static int need_new_buffer(struct writer_node *wn)
282 struct writer_node_group *wng = wn->wng;
283 struct private_osx_writer_data *powd = wn->private_data;
285 if (*wng->loaded < sizeof(short))
287 if (powd->to->remaining) /* Non empty buffer, must still be playing */
292 static int osx_write_post_select(__a_unused struct sched *s,
293 struct writer_node *wn)
295 struct private_osx_writer_data *powd = wn->private_data;
296 struct writer_node_group *wng = wn->wng;
297 short *data = (short*)wng->buf;
299 if (!need_new_buffer(wn))
301 fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
302 powd->to = powd->to->next;
303 wn->written = *wng->loaded;
305 if (AudioOutputUnitStart(powd->output))
312 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
314 s->timeout.tv_sec = 0;
315 s->timeout.tv_usec = 20;
319 void osx_writer_init(struct writer *w)
321 w->open = osx_writer_open;
322 w->close = osx_writer_close;
323 w->pre_select = osx_write_pre_select;
324 w->post_select = osx_write_post_select;
325 w->parse_config = osx_write_parse_config;
326 w->shutdown = NULL; /* nothing to do */