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