osx_write.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_write.c paraslash's output plugin for MacOs */
  20
  21 /*
  22  * based on mosx-mpg123, by Guillaume Outters and Steven A. Kortze
  23  * <skortze@sourceforge.net>
  24  */
  25
  26 #include <CoreAudio/CoreAudio.h>
  27 #include "para.h"
  28 #include "fd.h"
  29 #include "string.h"
  30 #include "list.h"
  31 #include "sched.h"
  32 #include "write.h"
  33 #include "osx_write.cmdline.h"
  34 #include "error.h"
  35
  36
  37 #include <CoreAudio/CoreAudio.h>
  38 #include <AudioUnit/AudioUnit.h>
  39 #include <AudioToolbox/DefaultAudioOutput.h>
  40 struct osx_buffer {
  41         float *buffer;
  42         long size;
  43         float *ptr; /* Where in the buffer are we? */
  44         long remaining;
  45         struct osx_buffer *next;
  46 };
  47
  48 struct private_osx_write_data {
  49         long size;
  50         AudioUnit output;
  51         char play;
  52         struct osx_buffer *from; /* Current buffers */
  53         struct osx_buffer *to;
  54         unsigned samplerate;
  55         unsigned channels;
  56 };
  57
  58
  59 /*
  60  * Tried with 3 buffers, but then any little window move is sufficient to
  61  * stop the sound (OK, on a G3 400 with a Public Beta. Perhaps now we can
  62  * go down to 2 buffers). With 16 buffers we have 1.5 seconds music
  63  * buffered (or, if you're pessimistic, 1.5 seconds latency). Note 0
  64  * buffers don't work much further than the Bus error.
  65  */
  66 #define NUMBER_BUFFERS 2
  67
  68 static void destroy_buffers(struct private_osx_write_data *powd)
  69 {
  70         struct osx_buffer *ptr;
  71         struct osx_buffer *ptr2;
  72         ptr = powd->to->next;
  73         powd->to->next = NULL;
  74         while (ptr) {
  75                 ptr2 = ptr->next;
  76                 free(ptr->buffer);
  77                 free(ptr);
  78                 ptr = ptr2;
  79         }
  80 }
  81
  82 static void init_buffers(struct private_osx_write_data *powd)
  83 {
  84         int i;
  85
  86         struct osx_buffer **ptrptr;
  87         ptrptr = &powd->to;
  88         for (i = 0; i < NUMBER_BUFFERS; i++) {
  89                 *ptrptr = malloc(sizeof(struct osx_buffer));
  90                 (*ptrptr)->size = 0;
  91                 (*ptrptr)->remaining = 0;
  92                 (*ptrptr)->buffer = NULL;
  93                 ptrptr = &(*ptrptr)->next;
  94         }
  95         *ptrptr = powd->from = powd->to;
  96 }
  97
  98 static void fill_buffer(struct osx_buffer *b, short *source, long size)
  99 {
 100         float *dest;
 101
 102         if (b->remaining) /* Non empty buffer, must still be playing */
 103                 return;
 104         if (b->size != size) {
 105                 b->buffer = para_realloc(b->buffer, size * sizeof(float));
 106                 b->size = size;
 107         }
 108         dest = b->buffer;
 109         while (size--) {
 110                 char *tmp = (char *)source;
 111                 char c = *tmp;
 112                 *tmp = *(tmp + 1);
 113                 *(tmp + 1) = c;
 114                 /* *dest++ = ((*source++) + 32768) / 65536.0; */
 115                 *dest++ = (*source++) / 32768.0;
 116         }
 117         b->ptr = b->buffer;
 118         b->remaining = b->size;
 119 }
 120
 121 static OSStatus osx_callback(void * inClientData,
 122         __a_unused AudioUnitRenderActionFlags *inActionFlags,
 123         __a_unused const AudioTimeStamp *inTimeStamp,
 124         __a_unused  UInt32 inBusNumber,
 125         __a_unused UInt32 inNumFrames,
 126         AudioBufferList *outOutputData)
 127 {
 128         long m, n;
 129         float *dest;
 130         int i;
 131         struct private_osx_write_data *powd = inClientData;
 132
 133 //      PARA_INFO_LOG("%p\n", powd);
 134         for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
 135                 /* what we have to fill */
 136                 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
 137                 dest = outOutputData->mBuffers[i].mData;
 138                 while (m > 0) {
 139                         if ((n = powd->from->remaining) <= 0) {
 140                                 PARA_INFO_LOG("%s", "buffer underrun\n");
 141                                 /* no more bytes in the current read buffer! */
 142                                 while ((n = powd->from->remaining) <= 0)
 143                                         /* wait for the results */
 144                                         usleep(2000);
 145                         }
 146 //                      PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
 147                         /*
 148                          * we dump what we can. In fact, just the necessary
 149                          * should be sufficient
 150                          */
 151                         if (n > m)
 152                                 n = m;
 153                         memcpy(dest, powd->from->ptr, n * sizeof(float));
 154                         dest += n;
 155                         /* remember all done work */
 156                         m -= n;
 157                         powd->from->ptr += n;
 158                         if ((powd->from->remaining -= n) <= 0)
 159                                 powd->from = powd->from->next;
 160                 }
 161         }
 162         return 0;
 163 }
 164
 165 static int osx_write_open(struct writer_node *wn)
 166 {
 167         struct private_osx_write_data *powd = para_calloc(
 168                 sizeof(struct private_osx_write_data));
 169         ComponentDescription desc;
 170         Component comp;
 171         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 172         AudioStreamBasicDescription format;
 173         int ret;
 174         struct writer_node_group *wng = wn->wng;
 175         struct osx_write_args_info *conf = wn->conf;
 176
 177         wn->private_data = powd;
 178         /* where did that default audio output go? */
 179         desc.componentType = kAudioUnitType_Output;
 180         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 181         /* NOTE: and if default output isn't Apple? */
 182         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 183         desc.componentFlags = 0;
 184         desc.componentFlagsMask = 0;
 185         ret = -E_DEFAULT_COMP;
 186         comp = FindNextComponent(NULL, &desc);
 187         if (!comp)
 188                 goto e0;
 189         ret = -E_OPEN_COMP;
 190         if (OpenAComponent(comp, &powd->output))
 191                 goto e0;
 192         ret = -E_UNIT_INIT;
 193         if (AudioUnitInitialize(powd->output))
 194                 goto e1;
 195         powd->size = 0;
 196         powd->play = 0;
 197         /* Hmmm, let's choose PCM format */
 198         /* We tell the Output Unit what format we're going to supply data to it.
 199          * This is necessary if you're providing data through an input callback
 200          * AND you want the DefaultOutputUnit to do any format conversions
 201          * necessary from your format to the device's format.
 202          */
 203         if (!conf->samplerate_given && wng->samplerate)
 204                 powd->samplerate = *wng->samplerate;
 205         else
 206                 powd->samplerate = conf->samplerate_arg;
 207         format.mSampleRate = powd->samplerate;
 208         /* The specific encoding type of audio stream*/
 209         format.mFormatID = kAudioFormatLinearPCM;
 210         /* flags specific to each format */
 211         format.mFormatFlags = kLinearPCMFormatFlagIsFloat
 212                 | kLinearPCMFormatFlagIsPacked
 213                 | kLinearPCMFormatFlagIsBigEndian;
 214         if (!conf->channels_given && wng->channels)
 215                 powd->channels = *wng->channels;
 216         else
 217                 powd->channels = conf->channels_arg;
 218         format.mChannelsPerFrame = powd->channels;
 219         format.mFramesPerPacket = 1;
 220         format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
 221         format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
 222         /* one of the most constant constants of the whole computer history */
 223         format.mBitsPerChannel = sizeof(float) * 8;
 224         ret = -E_STREAM_FORMAT;
 225         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
 226                         kAudioUnitScope_Input, 0, &format,
 227                         sizeof(AudioStreamBasicDescription)))
 228                 goto e2;
 229         init_buffers(powd);
 230         ret = -E_ADD_CALLBACK;
 231         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
 232                         kAudioUnitScope_Input, 0, &inputCallback,
 233                         sizeof(inputCallback)) < 0)
 234                 goto e3;
 235         return 1;
 236 e3:
 237         destroy_buffers(powd);
 238 e2:
 239         AudioUnitUninitialize(powd->output);
 240 e1:
 241         CloseComponent(powd->output);
 242 e0:
 243         return ret;
 244 }
 245
 246 __malloc void *osx_write_parse_config(char *options)
 247 {
 248         struct osx_write_args_info *conf
 249                 = para_calloc(sizeof(struct osx_write_args_info));
 250         PARA_INFO_LOG("options: %s\n", options);
 251         int ret = osx_cmdline_parser_string(options, conf, "osx_write");
 252         if (ret)
 253                 goto err_out;
 254         return conf;
 255 err_out:
 256         free(conf);
 257         return NULL;
 258
 259 }
 260
 261 static void osx_write_close(struct writer_node *wn)
 262 {
 263         struct private_osx_write_data *powd = wn->private_data;
 264
 265         PARA_INFO_LOG("closing writer node %p\n", wn);
 266         AudioOutputUnitStop(powd->output);
 267         AudioUnitUninitialize(powd->output);
 268         CloseComponent(powd->output);
 269         destroy_buffers(powd);
 270         free(powd);
 271 }
 272
 273 static int need_new_buffer(struct writer_node *wn)
 274 {
 275         struct writer_node_group *wng = wn->wng;
 276         struct private_osx_write_data *powd = wn->private_data;
 277
 278         if (*wng->loaded < sizeof(short))
 279                 return 0;
 280         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 281                 return 0;
 282         return 1;
 283 }
 284
 285 static int osx_write_post_select(__a_unused struct sched *s,
 286                 struct writer_node *wn)
 287 {
 288         struct private_osx_write_data *powd = wn->private_data;
 289         struct writer_node_group *wng = wn->wng;
 290         short *data = (short*)wng->buf;
 291
 292         if (!need_new_buffer(wn))
 293                 return 1;
 294         fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
 295         powd->to = powd->to->next;
 296         wn->written = *wng->loaded;
 297         if (!powd->play) {
 298                 if (AudioOutputUnitStart(powd->output))
 299                         return -E_UNIT_START;
 300                 powd->play = 1;
 301         }
 302         return 1;
 303 }
 304
 305 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 306 {
 307         struct private_osx_write_data *powd = wn->private_data;
 308         struct writer_node_group *wng = wn->wng;
 309         size_t numbytes = powd->to->remaining * sizeof(short);
 310         struct timeval tmp = {.tv_sec = 1, .tv_usec = 0}, delay = tmp;
 311         unsigned long divisor;
 312
 313         if (!numbytes && *wng->loaded >= sizeof(short))
 314                 goto min_delay; /* there's a buffer to fill */
 315         if (!numbytes)
 316                 return 1;
 317         divisor = powd->samplerate * powd->channels * 2 / numbytes;
 318         if (divisor)
 319                 tv_divide(divisor, &tmp, &delay);
 320         if (tv_diff(&s->timeout, &delay, NULL) > 0)
 321                 s->timeout = delay;
 322 //      PARA_DEBUG_LOG("delay: %lu:%lu\n", (long unsigned) s->timeout.tv_sec,
 323 //              (long unsigned) s->timeout.tv_usec);
 324         return 1;
 325 min_delay:
 326         PARA_DEBUG_LOG("%s\n", "minimal delay");
 327         s->timeout.tv_sec = 0;
 328         s->timeout.tv_usec = 1;
 329         return 1;
 330 }
 331
 332 void osx_write_init(struct writer *w)
 333 {
 334         w->open = osx_write_open;
 335         w->close = osx_write_close;
 336         w->pre_select = osx_write_pre_select;
 337         w->post_select = osx_write_post_select;
 338         w->parse_config = osx_write_parse_config;
 339         w->shutdown = NULL; /* nothing to do */
 340 }