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