2 * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file osx_write.c paraslash's output plugin for MacOs */
10 * based on mosx-mpg123, by Guillaume Outters and Steven A. Kortze
11 * <skortze@sourceforge.net>
14 #include <CoreAudio/CoreAudio.h>
21 #include "osx_write.cmdline.h"
25 #include <CoreAudio/CoreAudio.h>
26 #include <AudioUnit/AudioUnit.h>
27 #include <AudioToolbox/DefaultAudioOutput.h>
29 /** describes one input buffer for the osx writer */
31 /** pointer to the beginning of the buffer */
33 /** the size of this buffer */
35 /** current position in the buffer */
37 /** number of floats not yet consuned */
39 /** pointer to the next audio buffer */
40 struct osx_buffer *next;
43 /** data specific to the osx writer */
44 struct private_osx_write_data {
45 /** the main control structure for audio data manipulation */
47 /** non-zero if playback has started */
49 /** callback reads audio data from this buffer */
50 struct osx_buffer *from;
51 /** the post_select writes audio data here */
52 struct osx_buffer *to;
53 /** sample rate of the current audio stream */
55 /** number of channels of the current audio stream */
59 static void destroy_buffers(struct private_osx_write_data *powd)
61 struct osx_buffer *ptr;
62 struct osx_buffer *ptr2;
64 powd->to->next = NULL;
73 static void init_buffers(struct writer_node *wn)
75 struct private_osx_write_data *powd = wn->private_data;
76 struct osx_write_args_info *conf = wn->conf;
77 struct osx_buffer **ptrptr;
81 for (i = 0; i < conf->numbuffers_arg; i++) {
82 *ptrptr = malloc(sizeof(struct osx_buffer));
84 (*ptrptr)->remaining = 0;
85 (*ptrptr)->buffer = NULL;
86 ptrptr = &(*ptrptr)->next;
88 *ptrptr = powd->from = powd->to;
91 static void fill_buffer(struct osx_buffer *b, short *source, long size)
95 if (b->remaining) /* Non empty buffer, must still be playing */
97 if (b->size != size) {
98 b->buffer = para_realloc(b->buffer, size * sizeof(float));
103 *dest++ = (*source++) / 32768.0;
105 b->remaining = b->size;
108 static OSStatus osx_callback(void * inClientData,
109 __a_unused AudioUnitRenderActionFlags *inActionFlags,
110 __a_unused const AudioTimeStamp *inTimeStamp,
111 __a_unused UInt32 inBusNumber,
112 __a_unused UInt32 inNumFrames,
113 AudioBufferList *outOutputData)
118 struct private_osx_write_data *powd = inClientData;
120 // PARA_INFO_LOG("%p\n", powd);
121 for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
122 /* what we have to fill */
123 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
124 dest = outOutputData->mBuffers[i].mData;
126 if ((n = powd->from->remaining) <= 0) {
127 PARA_INFO_LOG("%s", "buffer underrun\n");
130 // PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
132 * we dump what we can. In fact, just the necessary
133 * should be sufficient
137 memcpy(dest, powd->from->ptr, n * sizeof(float));
139 /* remember all done work */
141 powd->from->ptr += n;
142 if ((powd->from->remaining -= n) <= 0)
143 powd->from = powd->from->next;
149 static int osx_write_open(struct writer_node *wn)
151 struct private_osx_write_data *powd = para_calloc(
152 sizeof(struct private_osx_write_data));
153 ComponentDescription desc;
155 AURenderCallbackStruct inputCallback = {osx_callback, powd};
156 AudioStreamBasicDescription format;
158 struct writer_node_group *wng = wn->wng;
159 struct osx_write_args_info *conf = wn->conf;
161 wn->private_data = powd;
162 /* where did that default audio output go? */
163 desc.componentType = kAudioUnitType_Output;
164 desc.componentSubType = kAudioUnitSubType_DefaultOutput;
165 /* NOTE: and if default output isn't Apple? */
166 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
167 desc.componentFlags = 0;
168 desc.componentFlagsMask = 0;
169 ret = -E_DEFAULT_COMP;
170 comp = FindNextComponent(NULL, &desc);
174 if (OpenAComponent(comp, &powd->audio_unit))
177 if (AudioUnitInitialize(powd->audio_unit))
180 /* Hmmm, let's choose PCM format */
181 /* We tell the Output Unit what format we're going to supply data to it.
182 * This is necessary if you're providing data through an input callback
183 * AND you want the DefaultOutputUnit to do any format conversions
184 * necessary from your format to the device's format.
186 if (!conf->samplerate_given && wng->samplerate)
187 powd->samplerate = *wng->samplerate;
189 powd->samplerate = conf->samplerate_arg;
190 format.mSampleRate = powd->samplerate;
191 /* The specific encoding type of audio stream*/
192 format.mFormatID = kAudioFormatLinearPCM;
193 /* flags specific to each format */
194 format.mFormatFlags = kLinearPCMFormatFlagIsFloat
195 | kLinearPCMFormatFlagIsPacked
196 | kLinearPCMFormatFlagIsBigEndian;
197 if (!conf->channels_given && wng->channels)
198 powd->channels = *wng->channels;
200 powd->channels = conf->channels_arg;
201 format.mChannelsPerFrame = powd->channels;
202 format.mFramesPerPacket = 1;
203 format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
204 format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
205 /* one of the most constant constants of the whole computer history */
206 format.mBitsPerChannel = sizeof(float) * 8;
207 ret = -E_STREAM_FORMAT;
208 if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_StreamFormat,
209 kAudioUnitScope_Input, 0, &format,
210 sizeof(AudioStreamBasicDescription)))
213 ret = -E_ADD_CALLBACK;
214 if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_SetRenderCallback,
215 kAudioUnitScope_Input, 0, &inputCallback,
216 sizeof(inputCallback)) < 0)
220 destroy_buffers(powd);
222 AudioUnitUninitialize(powd->audio_unit);
224 CloseComponent(powd->audio_unit);
229 __malloc static void *osx_write_parse_config(const char *options)
231 struct osx_write_args_info *conf
232 = para_calloc(sizeof(struct osx_write_args_info));
233 PARA_INFO_LOG("options: %s\n", options);
234 int ret = osx_cmdline_parser_string(options, conf, "osx_write");
244 static void osx_write_close(struct writer_node *wn)
246 struct private_osx_write_data *powd = wn->private_data;
248 PARA_INFO_LOG("closing writer node %p\n", wn);
249 AudioOutputUnitStop(powd->audio_unit);
250 AudioUnitUninitialize(powd->audio_unit);
251 CloseComponent(powd->audio_unit);
252 destroy_buffers(powd);
256 static int need_new_buffer(struct writer_node *wn)
258 struct writer_node_group *wng = wn->wng;
259 struct private_osx_write_data *powd = wn->private_data;
261 if (*wng->loaded < sizeof(short))
263 if (powd->to->remaining) /* Non empty buffer, must still be playing */
268 static int osx_write_post_select(__a_unused struct sched *s,
269 struct writer_node *wn)
271 struct private_osx_write_data *powd = wn->private_data;
272 struct writer_node_group *wng = wn->wng;
273 short *data = (short*)wng->buf;
275 if (!need_new_buffer(wn))
277 fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
278 powd->to = powd->to->next;
279 wn->written = *wng->loaded;
281 if (AudioOutputUnitStart(powd->audio_unit))
282 return -E_UNIT_START;
288 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
290 struct private_osx_write_data *powd = wn->private_data;
291 struct writer_node_group *wng = wn->wng;
292 size_t numbytes = powd->to->remaining * sizeof(short);
293 struct timeval tmp = {.tv_sec = 1, .tv_usec = 0}, delay = tmp;
294 unsigned long divisor;
296 if (!numbytes && *wng->loaded >= sizeof(short))
297 goto min_delay; /* there's a buffer to fill */
300 divisor = powd->samplerate * powd->channels * 2 / numbytes;
302 tv_divide(divisor, &tmp, &delay);
303 if (tv_diff(&s->timeout, &delay, NULL) > 0)
305 // PARA_DEBUG_LOG("delay: %lu:%lu\n", (long unsigned) s->timeout.tv_sec,
306 // (long unsigned) s->timeout.tv_usec);
309 PARA_DEBUG_LOG("%s\n", "minimal delay");
310 s->timeout.tv_sec = 0;
311 s->timeout.tv_usec = 1;
315 /** the init function of the osx writer */
316 void osx_write_init(struct writer *w)
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 */