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