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 #include <semaphore.h>
  36 struct osx_buffer {
  37         float *buffer;
  38         long size;
  39         float *ptr; /* Where in the buffer are we? */
  40         long remaining;
  41         struct osx_buffer *next;
  42 };
  43 typedef struct osx_buffer osx_buffer;
  44
  45 struct private_osx_writer_data {
  46         long size;
  47         short *ptr;
  48         AudioUnit output;
  49         char play;
  50         sem_t *semaphore;
  51         osx_buffer *from; /* Current buffers */
  52         osx_buffer *to;
  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                 sem_post(powd->semaphore);
  94         }
  95         *ptrptr = powd->from = powd->to;
  96 }
  97
  98 static void fill_buffer(osx_buffer *b, short *source, long size)
  99 {
 100         float *dest;
 101
 102         if (b->remaining) /* Non empty buffer, must still be playing */
 103                 return;
 104         PARA_INFO_LOG("%ld\n", size);
 105         if (b->size != size) {
 106                 /*
 107                  * Hey! What's that? Coudn't this buffer size be fixed
 108                  * once (well, perhaps we just didn't allocate it yet)
 109                  */
 110                 if (b->buffer)
 111                         free(b->buffer);
 112                 b->buffer = malloc(size * sizeof(float));
 113                 b->size = size;
 114         }
 115         dest = b->buffer;
 116         while (size--) {
 117                 char *tmp = (char *)source;
 118                 char c = *tmp;
 119                 *tmp = *(tmp + 1);
 120                 *(tmp + 1) = c;
 121                 /* *dest++ = ((*source++) + 32768) / 65536.0; */
 122                 *dest++ = (*source++) / 32768.0;
 123         }
 124         b->ptr = b->buffer;
 125         b->remaining = b->size;
 126 }
 127
 128 static OSStatus osx_callback(void * inClientData,
 129         __a_unused AudioUnitRenderActionFlags *inActionFlags,
 130         __a_unused const AudioTimeStamp *inTimeStamp,
 131         __a_unused  UInt32 inBusNumber,
 132         __a_unused UInt32 inNumFrames,
 133         AudioBufferList *outOutputData)
 134 {
 135         long m, n;
 136         float *dest;
 137         int i;
 138         struct private_osx_writer_data *powd = inClientData;
 139
 140 //      PARA_INFO_LOG("%p\n", powd);
 141         for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
 142                 /* what we have to fill */
 143                 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
 144                 dest = outOutputData->mBuffers[i].mData;
 145                 while (m > 0) {
 146                         if ((n = powd->from->remaining) <= 0) {
 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                                 /* tell that there's a buffer to fill */
 166                                 sem_post(powd->semaphore);
 167                                 powd->from = powd->from->next;
 168                         }
 169                 }
 170         }
 171         return 0;
 172 }
 173
 174 static int osx_writer_open(struct writer_node *wn)
 175 {
 176         struct private_osx_writer_data *powd = para_calloc(
 177                 sizeof(struct private_osx_writer_data));
 178         ComponentDescription desc;
 179         Component comp;
 180         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 181         AudioStreamBasicDescription format;
 182         char s[10];
 183         int m, ret;
 184
 185         wn->private_data = powd;
 186         /* where did that default audio output go? */
 187         desc.componentType = kAudioUnitType_Output;
 188         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 189         /* NOTE: and if default output isn't Apple? */
 190         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 191         desc.componentFlags = 0;
 192         desc.componentFlagsMask = 0;
 193         ret = -E_DEFAULT_COMP;
 194         comp = FindNextComponent(NULL, &desc);
 195         if (!comp)
 196                 goto e0;
 197         ret = -E_OPEN_COMP;
 198         if (OpenAComponent(comp, &powd->output))
 199                 goto e0;
 200         ret = -E_UNIT_INIT;
 201         if (AudioUnitInitialize(powd->output))
 202                 goto e1;
 203         powd->size = 0;
 204         powd->ptr = NULL;
 205         powd->play = 0;
 206         /* Hmmm, let's choose PCM format */
 207         /* We tell the Output Unit what format we're going to supply data to it.
 208          * This is necessary if you're providing data through an input callback
 209          * AND you want the DefaultOutputUnit to do any format conversions
 210          * necessary from your format to the device's format.
 211          */
 212         format.mSampleRate = 44100.0; /* The sample rate of the audio stream */
 213         /* The specific encoding type of audio stream*/
 214         format.mFormatID = kAudioFormatLinearPCM;
 215         /* flags specific to each format */
 216         format.mFormatFlags = kLinearPCMFormatFlagIsFloat
 217                 | kLinearPCMFormatFlagIsPacked
 218                 | kLinearPCMFormatFlagIsBigEndian;
 219         /*
 220          * We produce 2-channel audio. Now if we have a mega-super-hyper card for our
 221          * audio, it is its problem to convert it to 8-, 16-, 32- or 1024-channel data.
 222          */
 223         format.mBytesPerFrame = (format.mFramesPerPacket = 1)
 224                 * (format.mBytesPerPacket = (format.mChannelsPerFrame = 2) * sizeof(float));
 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 the semaphore */
 233         strcpy(s, "/mpg123-0000");
 234         do {
 235                 for (m = 10;; m--)
 236                         if( (s[m]++) <= '9')
 237                                 break;
 238                         else
 239                                 s[m] = '0';
 240         } while ((powd->semaphore = sem_open(s, O_CREAT | O_EXCL, 0644, 0))
 241                 == (sem_t *)SEM_FAILED);
 242         init_buffers(powd);
 243         ret = -E_ADD_CALLBACK;
 244         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
 245                         kAudioUnitScope_Input, 0, &inputCallback,
 246                         sizeof(inputCallback)) < 0)
 247                 goto e3;
 248         return 1;
 249 e3:
 250         destroy_buffers(powd);
 251 e2:
 252         AudioUnitUninitialize(powd->output);
 253 e1:
 254         CloseComponent(powd->output);
 255 e0:
 256         return ret;
 257 }
 258
 259 __malloc void *osx_write_parse_config(char *options)
 260 {
 261         struct osx_write_args_info *conf
 262                 = para_calloc(sizeof(struct osx_write_args_info));
 263         PARA_INFO_LOG("options: %s\n", options);
 264         int ret = osx_cmdline_parser_string(options, conf, "osx_write");
 265         if (ret)
 266                 goto err_out;
 267         return conf;
 268 err_out:
 269         free(conf);
 270         return NULL;
 271
 272 }
 273
 274 static void osx_writer_close(struct writer_node *wn)
 275 {
 276         struct private_osx_writer_data *powd = wn->private_data;
 277
 278         PARA_INFO_LOG("closing writer node %p\n", wn);
 279         AudioOutputUnitStop(powd->output);
 280         AudioUnitUninitialize(powd->output);
 281         CloseComponent(powd->output);
 282         destroy_buffers(powd);
 283         sem_close(powd->semaphore);
 284         free(powd);
 285 }
 286
 287 static int osx_write_post_select(__a_unused struct sched *s,
 288                 struct writer_node *wn)
 289 {
 290         struct private_osx_writer_data *powd = wn->private_data;
 291         struct writer_node_group *wng = wn->wng;
 292         short *data = (short*)wng->buf + wn->written;
 293
 294         if (*wng->loaded <= wn->written)
 295                 return 1;
 296         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 297                 return 1;
 298         fill_buffer(powd->to, data, (*wng->loaded - wn->written) / sizeof(short));
 299         powd->to = powd->to->next;
 300         wn->written += (*wng->loaded - wn->written);
 301         if (!powd->play) {
 302                 if (AudioOutputUnitStart(powd->output))
 303                         return -1;
 304                 powd->play = 1;
 305         }
 306         return 1;
 307 }
 308
 309 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 310 {
 311         s->timeout.tv_sec = 0;
 312         s->timeout.tv_usec = 20;
 313         return 1;
 314 }
 315
 316 void osx_writer_init(struct writer *w)
 317 {
 318         w->open = osx_writer_open;
 319         w->close = osx_writer_close;
 320         w->pre_select = osx_write_pre_select;
 321         w->post_select = osx_write_post_select;
 322         w->parse_config = osx_write_parse_config;
 323         w->shutdown = NULL; /* nothing to do */
 324 }