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