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         unsigned channels;
  55 };
  56
  57
  58 /*
  59  * Tried with 3 buffers, but then any little window move is sufficient to
  60  * stop the sound (OK, on a G3 400 with a Public Beta. Perhaps now we can
  61  * go down to 2 buffers). With 16 buffers we have 1.5 seconds music
  62  * buffered (or, if you're pessimistic, 1.5 seconds latency). Note 0
  63  * buffers don't work much further than the Bus error.
  64  */
  65 #define NUMBER_BUFFERS 2
  66
  67 static void destroy_buffers(struct private_osx_writer_data *powd)
  68 {
  69         osx_buffer *ptr;
  70         osx_buffer *ptr2;
  71         ptr = powd->to->next;
  72         powd->to->next = NULL;
  73         while (ptr) {
  74                 ptr2 = ptr->next;
  75                 if (ptr->buffer)
  76                         free(ptr->buffer);
  77                 free(ptr);
  78                 ptr = ptr2;
  79         }
  80 }
  81
  82 static void init_buffers(struct private_osx_writer_data *powd)
  83 {
  84         int i;
  85
  86         osx_buffer ** ptrptr;
  87         ptrptr = &powd->to;
  88         for (i = 0; i < NUMBER_BUFFERS; i++) {
  89                 *ptrptr = malloc(sizeof(osx_buffer));
  90                 (*ptrptr)->size = 0;
  91                 (*ptrptr)->remaining = 0;
  92                 (*ptrptr)->buffer = NULL;
  93                 ptrptr = &(*ptrptr)->next;
  94                 /* This buffer is ready for filling (of course, it is empty!) */
  95                 sem_post(powd->semaphore);
  96         }
  97         *ptrptr = powd->from = powd->to;
  98 }
  99
 100 static void fill_buffer(osx_buffer *b, short *source, long size)
 101 {
 102         float *dest;
 103
 104         if (b->remaining) /* Non empty buffer, must still be playing */
 105                 return;
 106         PARA_INFO_LOG("%ld\n", size);
 107         if (b->size != size) {
 108                 /*
 109                  * Hey! What's that? Coudn't this buffer size be fixed
 110                  * once (well, perhaps we just didn't allocate it yet)
 111                  */
 112                 if (b->buffer)
 113                         free(b->buffer);
 114                 b->buffer = malloc(size * sizeof(float));
 115                 b->size = size;
 116         }
 117         dest = b->buffer;
 118         while (size--) {
 119                 char *tmp = (char *)source;
 120                 char c = *tmp;
 121                 *tmp = *(tmp + 1);
 122                 *(tmp + 1) = c;
 123                 /* *dest++ = ((*source++) + 32768) / 65536.0; */
 124                 *dest++ = (*source++) / 32768.0;
 125         }
 126         b->ptr = b->buffer;
 127         b->remaining = b->size;
 128 }
 129
 130 static OSStatus osx_callback(void * inClientData,
 131         __a_unused AudioUnitRenderActionFlags *inActionFlags,
 132         __a_unused const AudioTimeStamp *inTimeStamp,
 133         __a_unused  UInt32 inBusNumber,
 134         __a_unused UInt32 inNumFrames,
 135         AudioBufferList *outOutputData)
 136 {
 137         long m, n;
 138         float *dest;
 139         int i;
 140         struct private_osx_writer_data *powd = inClientData;
 141
 142 //      PARA_INFO_LOG("%p\n", powd);
 143         for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
 144                 /* what we have to fill */
 145                 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
 146                 dest = outOutputData->mBuffers[i].mData;
 147                 while (m > 0) {
 148                         if ((n = powd->from->remaining) <= 0) {
 149                                 /* no more bytes in the current read buffer! */
 150                                 while ((n = powd->from->remaining) <= 0)
 151                                         /* wait for the results */
 152                                         usleep(2000);
 153                         }
 154                         PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
 155                         /*
 156                          * we dump what we can. In fact, just the necessary
 157                          * should be sufficient
 158                          */
 159                         if (n > m)
 160                                 n = m;
 161                         memcpy(dest, powd->from->ptr, n * sizeof(float));
 162                         dest += n;
 163                         /* remember all done work */
 164                         m -= n;
 165                         powd->from->ptr += n;
 166                         if ((powd->from->remaining -= n) <= 0) {
 167                                 /* tell that there's a buffer to fill */
 168                                 sem_post(powd->semaphore);
 169                                 powd->from = powd->from->next;
 170                         }
 171                 }
 172         }
 173         return 0;
 174 }
 175
 176 static int osx_writer_open(struct writer_node *wn)
 177 {
 178         struct private_osx_writer_data *powd = para_calloc(
 179                 sizeof(struct private_osx_writer_data));
 180         ComponentDescription desc;
 181         Component comp;
 182         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 183         AudioStreamBasicDescription format;
 184         char s[10];
 185         int m, ret;
 186         struct writer_node_group *wng = wn->wng;
 187         struct osx_write_args_info *conf = wn->conf;
 188
 189         wn->private_data = powd;
 190         /* where did that default audio output go? */
 191         desc.componentType = kAudioUnitType_Output;
 192         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 193         /* NOTE: and if default output isn't Apple? */
 194         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 195         desc.componentFlags = 0;
 196         desc.componentFlagsMask = 0;
 197         ret = -E_DEFAULT_COMP;
 198         comp = FindNextComponent(NULL, &desc);
 199         if (!comp)
 200                 goto e0;
 201         ret = -E_OPEN_COMP;
 202         if (OpenAComponent(comp, &powd->output))
 203                 goto e0;
 204         ret = -E_UNIT_INIT;
 205         if (AudioUnitInitialize(powd->output))
 206                 goto e1;
 207         powd->size = 0;
 208         powd->ptr = NULL;
 209         powd->play = 0;
 210         /* Hmmm, let's choose PCM format */
 211         /* We tell the Output Unit what format we're going to supply data to it.
 212          * This is necessary if you're providing data through an input callback
 213          * AND you want the DefaultOutputUnit to do any format conversions
 214          * necessary from your format to the device's format.
 215          */
 216         if (!conf->samplerate_given && wng->samplerate)
 217                 powd->samplerate = *wng->samplerate;
 218         else
 219                 powd->samplerate = conf->samplerate_arg;
 220         format.mSampleRate = powd->samplerate;
 221         /* The specific encoding type of audio stream*/
 222         format.mFormatID = kAudioFormatLinearPCM;
 223         /* flags specific to each format */
 224         format.mFormatFlags = kLinearPCMFormatFlagIsFloat
 225                 | kLinearPCMFormatFlagIsPacked
 226                 | kLinearPCMFormatFlagIsBigEndian;
 227         if (!conf->channels_given && wng->channels)
 228                 powd->channels = *wng->channels;
 229         else
 230                 powd->channels = conf->channels_arg;
 231         format.mChannelsPerFrame = powd->channels;
 232         format.mFramesPerPacket = 1;
 233         format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
 234         format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
 235         /* one of the most constant constants of the whole computer history */
 236         format.mBitsPerChannel = sizeof(float) * 8;
 237         ret = -E_STREAM_FORMAT;
 238         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
 239                         kAudioUnitScope_Input, 0, &format,
 240                         sizeof(AudioStreamBasicDescription)))
 241                 goto e2;
 242         /* init the semaphore */
 243         strcpy(s, "/mpg123-0000");
 244         do {
 245                 for (m = 10;; m--)
 246                         if( (s[m]++) <= '9')
 247                                 break;
 248                         else
 249                                 s[m] = '0';
 250         } while ((powd->semaphore = sem_open(s, O_CREAT | O_EXCL, 0644, 0))
 251                 == (sem_t *)SEM_FAILED);
 252         init_buffers(powd);
 253         ret = -E_ADD_CALLBACK;
 254         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
 255                         kAudioUnitScope_Input, 0, &inputCallback,
 256                         sizeof(inputCallback)) < 0)
 257                 goto e3;
 258         return 1;
 259 e3:
 260         destroy_buffers(powd);
 261 e2:
 262         AudioUnitUninitialize(powd->output);
 263 e1:
 264         CloseComponent(powd->output);
 265 e0:
 266         return ret;
 267 }
 268
 269 __malloc void *osx_write_parse_config(char *options)
 270 {
 271         struct osx_write_args_info *conf
 272                 = para_calloc(sizeof(struct osx_write_args_info));
 273         PARA_INFO_LOG("options: %s\n", options);
 274         int ret = osx_cmdline_parser_string(options, conf, "osx_write");
 275         if (ret)
 276                 goto err_out;
 277         return conf;
 278 err_out:
 279         free(conf);
 280         return NULL;
 281
 282 }
 283
 284 static void osx_writer_close(struct writer_node *wn)
 285 {
 286         struct private_osx_writer_data *powd = wn->private_data;
 287
 288         PARA_INFO_LOG("closing writer node %p\n", wn);
 289         AudioOutputUnitStop(powd->output);
 290         AudioUnitUninitialize(powd->output);
 291         CloseComponent(powd->output);
 292         destroy_buffers(powd);
 293         sem_close(powd->semaphore);
 294         free(powd);
 295 }
 296
 297 static int need_new_buffer(struct writer_node *wn)
 298 {
 299         struct writer_node_group *wng = wn->wng;
 300         struct private_osx_writer_data *powd = wn->private_data;
 301
 302         if (*wng->loaded < sizeof(short))
 303                 return 0;
 304         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 305                 return 0;
 306         return 1;
 307 }
 308
 309 static int osx_write_post_select(__a_unused struct sched *s,
 310                 struct writer_node *wn)
 311 {
 312         struct private_osx_writer_data *powd = wn->private_data;
 313         struct writer_node_group *wng = wn->wng;
 314         short *data = (short*)wng->buf;
 315
 316         if (!need_new_buffer(wn))
 317                 return 1;
 318         fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
 319         powd->to = powd->to->next;
 320         wn->written = *wng->loaded;
 321         if (!powd->play) {
 322                 if (AudioOutputUnitStart(powd->output))
 323                         return -1;
 324                 powd->play = 1;
 325         }
 326         return 1;
 327 }
 328
 329 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 330 {
 331         s->timeout.tv_sec = 0;
 332         s->timeout.tv_usec = 20;
 333         return 1;
 334 }
 335
 336 void osx_writer_init(struct writer *w)
 337 {
 338         w->open = osx_writer_open;
 339         w->close = osx_writer_close;
 340         w->pre_select = osx_write_pre_select;
 341         w->post_select = osx_write_post_select;
 342         w->parse_config = osx_write_parse_config;
 343         w->shutdown = NULL; /* nothing to do */
 344 }