osx_writer.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_writer.c paraslash's output plugin for MacOs */
  20
  21 #include <CoreAudio/CoreAudio.h>
  22 #include "para.h"
  23 #include "fd.h"
  24 #include "string.h"
  25 #include "list.h"
  26 #include "sched.h"
  27 #include "write.h"
  28 #include "osx_write.cmdline.h"
  29 #include "error.h"
  30
  31
  32 #include <CoreAudio/CoreAudio.h>
  33 #include <AudioUnit/AudioUnit.h>
  34 #include <AudioToolbox/DefaultAudioOutput.h>
  35 #include <semaphore.h>
  36 struct osx_buffer {
  37         float *buffer;
  38         long size;
  39         float *ptr; /* Where in the buffer are we? */
  40         long remaining;
  41         struct osx_buffer *next;
  42 };
  43 typedef struct osx_buffer osx_buffer;
  44
  45 struct private_osx_writer_data {
  46         long size;
  47         short *ptr;
  48         AudioUnit output;
  49         char play;
  50         sem_t *semaphore;
  51         osx_buffer *from; /* Current buffers */
  52         osx_buffer *to;
  53         unsigned samplerate;
  54 };
  55
  56
  57 /*
  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.
  63  */
  64 #define NUMBER_BUFFERS 2
  65
  66 static void destroy_buffers(struct private_osx_writer_data *powd)
  67 {
  68         osx_buffer *ptr;
  69         osx_buffer *ptr2;
  70         ptr = powd->to->next;
  71         powd->to->next = NULL;
  72         while (ptr) {
  73                 ptr2 = ptr->next;
  74                 if (ptr->buffer)
  75                         free(ptr->buffer);
  76                 free(ptr);
  77                 ptr = ptr2;
  78         }
  79 }
  80
  81 static void init_buffers(struct private_osx_writer_data *powd)
  82 {
  83         int i;
  84
  85         osx_buffer ** ptrptr;
  86         ptrptr = &powd->to;
  87         for (i = 0; i < NUMBER_BUFFERS; i++) {
  88                 *ptrptr = malloc(sizeof(osx_buffer));
  89                 (*ptrptr)->size = 0;
  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);
  95         }
  96         *ptrptr = powd->from = powd->to;
  97 }
  98
  99 static void fill_buffer(osx_buffer *b, short *source, long size)
 100 {
 101         float *dest;
 102
 103         if (b->remaining) /* Non empty buffer, must still be playing */
 104                 return;
 105         PARA_INFO_LOG("%ld\n", size);
 106         if (b->size != size) {
 107                 /*
 108                  * Hey! What's that? Coudn't this buffer size be fixed
 109                  * once (well, perhaps we just didn't allocate it yet)
 110                  */
 111                 if (b->buffer)
 112                         free(b->buffer);
 113                 b->buffer = malloc(size * sizeof(float));
 114                 b->size = size;
 115         }
 116         dest = b->buffer;
 117         while (size--) {
 118                 char *tmp = (char *)source;
 119                 char c = *tmp;
 120                 *tmp = *(tmp + 1);
 121                 *(tmp + 1) = c;
 122                 /* *dest++ = ((*source++) + 32768) / 65536.0; */
 123                 *dest++ = (*source++) / 32768.0;
 124         }
 125         b->ptr = b->buffer;
 126         b->remaining = b->size;
 127 }
 128
 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)
 135 {
 136         long m, n;
 137         float *dest;
 138         int i;
 139         struct private_osx_writer_data *powd = inClientData;
 140
 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;
 146                 while (m > 0) {
 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 */
 151                                         usleep(2000);
 152                         }
 153                         PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
 154                         /*
 155                          * we dump what we can. In fact, just the necessary
 156                          * should be sufficient
 157                          */
 158                         if (n > m)
 159                                 n = m;
 160                         memcpy(dest, powd->from->ptr, n * sizeof(float));
 161                         dest += n;
 162                         /* remember all done work */
 163                         m -= n;
 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;
 169                         }
 170                 }
 171         }
 172         return 0;
 173 }
 174
 175 static int osx_writer_open(struct writer_node *wn)
 176 {
 177         struct private_osx_writer_data *powd = para_calloc(
 178                 sizeof(struct private_osx_writer_data));
 179         ComponentDescription desc;
 180         Component comp;
 181         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 182         AudioStreamBasicDescription format;
 183         char s[10];
 184         int m, ret;
 185         struct writer_node_group *wng = wn->wng;
 186         struct osx_write_args_info *conf = wn->conf;
 187
 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);
 198         if (!comp)
 199                 goto e0;
 200         ret = -E_OPEN_COMP;
 201         if (OpenAComponent(comp, &powd->output))
 202                 goto e0;
 203         ret = -E_UNIT_INIT;
 204         if (AudioUnitInitialize(powd->output))
 205                 goto e1;
 206         powd->size = 0;
 207         powd->ptr = NULL;
 208         powd->play = 0;
 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.
 214          */
 215         if (!conf->samplerate_given && wng->samplerate)
 216                 powd->samplerate = *wng->samplerate;
 217         else
 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;
 226         /*
 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.
 229          */
 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)))
 238                 goto e2;
 239         /* init the semaphore */
 240         strcpy(s, "/mpg123-0000");
 241         do {
 242                 for (m = 10;; m--)
 243                         if( (s[m]++) <= '9')
 244                                 break;
 245                         else
 246                                 s[m] = '0';
 247         } while ((powd->semaphore = sem_open(s, O_CREAT | O_EXCL, 0644, 0))
 248                 == (sem_t *)SEM_FAILED);
 249         init_buffers(powd);
 250         ret = -E_ADD_CALLBACK;
 251         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
 252                         kAudioUnitScope_Input, 0, &inputCallback,
 253                         sizeof(inputCallback)) < 0)
 254                 goto e3;
 255         return 1;
 256 e3:
 257         destroy_buffers(powd);
 258 e2:
 259         AudioUnitUninitialize(powd->output);
 260 e1:
 261         CloseComponent(powd->output);
 262 e0:
 263         return ret;
 264 }
 265
 266 __malloc void *osx_write_parse_config(char *options)
 267 {
 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");
 272         if (ret)
 273                 goto err_out;
 274         return conf;
 275 err_out:
 276         free(conf);
 277         return NULL;
 278
 279 }
 280
 281 static void osx_writer_close(struct writer_node *wn)
 282 {
 283         struct private_osx_writer_data *powd = wn->private_data;
 284
 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);
 291         free(powd);
 292 }
 293
 294 static int need_new_buffer(struct writer_node *wn)
 295 {
 296         struct writer_node_group *wng = wn->wng;
 297         struct private_osx_writer_data *powd = wn->private_data;
 298
 299         if (*wng->loaded < sizeof(short))
 300                 return 0;
 301         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 302                 return 0;
 303         return 1;
 304 }
 305
 306 static int osx_write_post_select(__a_unused struct sched *s,
 307                 struct writer_node *wn)
 308 {
 309         struct private_osx_writer_data *powd = wn->private_data;
 310         struct writer_node_group *wng = wn->wng;
 311         short *data = (short*)wng->buf;
 312
 313         if (!need_new_buffer(wn))
 314                 return 1;
 315         fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
 316         powd->to = powd->to->next;
 317         wn->written = *wng->loaded;
 318         if (!powd->play) {
 319                 if (AudioOutputUnitStart(powd->output))
 320                         return -1;
 321                 powd->play = 1;
 322         }
 323         return 1;
 324 }
 325
 326 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 327 {
 328         s->timeout.tv_sec = 0;
 329         s->timeout.tv_usec = 20;
 330         return 1;
 331 }
 332
 333 void osx_writer_init(struct writer *w)
 334 {
 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 */
 341 }