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