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;
  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                 /* This buffer is ready for filling (of course, it is empty!) */
  97         }
  98         *ptrptr = powd->from = powd->to;
  99 }
 100
 101 static void fill_buffer(osx_buffer *b, short *source, long size)
 102 {
 103         float *dest;
 104
 105         if (b->remaining) /* Non empty buffer, must still be playing */
 106                 return;
 107         PARA_INFO_LOG("%ld\n", size);
 108         if (b->size != size) {
 109                 /*
 110                  * Hey! What's that? Coudn't this buffer size be fixed
 111                  * once (well, perhaps we just didn't allocate it yet)
 112                  */
 113                 if (b->buffer)
 114                         free(b->buffer);
 115                 b->buffer = malloc(size * sizeof(float));
 116                 b->size = size;
 117         }
 118         dest = b->buffer;
 119         while (size--) {
 120                 char *tmp = (char *)source;
 121                 char c = *tmp;
 122                 *tmp = *(tmp + 1);
 123                 *(tmp + 1) = c;
 124                 /* *dest++ = ((*source++) + 32768) / 65536.0; */
 125                 *dest++ = (*source++) / 32768.0;
 126         }
 127         b->ptr = b->buffer;
 128         b->remaining = b->size;
 129 }
 130
 131 static OSStatus osx_callback(void * inClientData,
 132         __a_unused AudioUnitRenderActionFlags *inActionFlags,
 133         __a_unused const AudioTimeStamp *inTimeStamp,
 134         __a_unused  UInt32 inBusNumber,
 135         __a_unused UInt32 inNumFrames,
 136         AudioBufferList *outOutputData)
 137 {
 138         long m, n;
 139         float *dest;
 140         int i;
 141         struct private_osx_write_data *powd = inClientData;
 142
 143 //      PARA_INFO_LOG("%p\n", powd);
 144         for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
 145                 /* what we have to fill */
 146                 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
 147                 dest = outOutputData->mBuffers[i].mData;
 148                 while (m > 0) {
 149                         if ((n = powd->from->remaining) <= 0) {
 150                                 PARA_INFO_LOG("%s", "buffer underrun\n");
 151                                 /* no more bytes in the current read buffer! */
 152                                 while ((n = powd->from->remaining) <= 0)
 153                                         /* wait for the results */
 154                                         usleep(2000);
 155                         }
 156                         PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
 157                         /*
 158                          * we dump what we can. In fact, just the necessary
 159                          * should be sufficient
 160                          */
 161                         if (n > m)
 162                                 n = m;
 163                         memcpy(dest, powd->from->ptr, n * sizeof(float));
 164                         dest += n;
 165                         /* remember all done work */
 166                         m -= n;
 167                         powd->from->ptr += n;
 168                         if ((powd->from->remaining -= n) <= 0)
 169                                 powd->from = powd->from->next;
 170                 }
 171         }
 172         return 0;
 173 }
 174
 175 static int osx_write_open(struct writer_node *wn)
 176 {
 177         struct private_osx_write_data *powd = para_calloc(
 178                 sizeof(struct private_osx_write_data));
 179         ComponentDescription desc;
 180         Component comp;
 181         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 182         AudioStreamBasicDescription format;
 183         int ret;
 184         struct writer_node_group *wng = wn->wng;
 185         struct osx_write_args_info *conf = wn->conf;
 186
 187         wn->private_data = powd;
 188         /* where did that default audio output go? */
 189         desc.componentType = kAudioUnitType_Output;
 190         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 191         /* NOTE: and if default output isn't Apple? */
 192         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 193         desc.componentFlags = 0;
 194         desc.componentFlagsMask = 0;
 195         ret = -E_DEFAULT_COMP;
 196         comp = FindNextComponent(NULL, &desc);
 197         if (!comp)
 198                 goto e0;
 199         ret = -E_OPEN_COMP;
 200         if (OpenAComponent(comp, &powd->output))
 201                 goto e0;
 202         ret = -E_UNIT_INIT;
 203         if (AudioUnitInitialize(powd->output))
 204                 goto e1;
 205         powd->size = 0;
 206         powd->ptr = NULL;
 207         powd->play = 0;
 208         /* Hmmm, let's choose PCM format */
 209         /* We tell the Output Unit what format we're going to supply data to it.
 210          * This is necessary if you're providing data through an input callback
 211          * AND you want the DefaultOutputUnit to do any format conversions
 212          * necessary from your format to the device's format.
 213          */
 214         if (!conf->samplerate_given && wng->samplerate)
 215                 powd->samplerate = *wng->samplerate;
 216         else
 217                 powd->samplerate = conf->samplerate_arg;
 218         format.mSampleRate = powd->samplerate;
 219         /* The specific encoding type of audio stream*/
 220         format.mFormatID = kAudioFormatLinearPCM;
 221         /* flags specific to each format */
 222         format.mFormatFlags = kLinearPCMFormatFlagIsFloat
 223                 | kLinearPCMFormatFlagIsPacked
 224                 | kLinearPCMFormatFlagIsBigEndian;
 225         if (!conf->channels_given && wng->channels)
 226                 powd->channels = *wng->channels;
 227         else
 228                 powd->channels = conf->channels_arg;
 229         format.mChannelsPerFrame = powd->channels;
 230         format.mFramesPerPacket = 1;
 231         format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
 232         format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
 233         /* one of the most constant constants of the whole computer history */
 234         format.mBitsPerChannel = sizeof(float) * 8;
 235         ret = -E_STREAM_FORMAT;
 236         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
 237                         kAudioUnitScope_Input, 0, &format,
 238                         sizeof(AudioStreamBasicDescription)))
 239                 goto e2;
 240         init_buffers(powd);
 241         ret = -E_ADD_CALLBACK;
 242         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
 243                         kAudioUnitScope_Input, 0, &inputCallback,
 244                         sizeof(inputCallback)) < 0)
 245                 goto e3;
 246         return 1;
 247 e3:
 248         destroy_buffers(powd);
 249 e2:
 250         AudioUnitUninitialize(powd->output);
 251 e1:
 252         CloseComponent(powd->output);
 253 e0:
 254         return ret;
 255 }
 256
 257 __malloc void *osx_write_parse_config(char *options)
 258 {
 259         struct osx_write_args_info *conf
 260                 = para_calloc(sizeof(struct osx_write_args_info));
 261         PARA_INFO_LOG("options: %s\n", options);
 262         int ret = osx_cmdline_parser_string(options, conf, "osx_write");
 263         if (ret)
 264                 goto err_out;
 265         return conf;
 266 err_out:
 267         free(conf);
 268         return NULL;
 269
 270 }
 271
 272 static void osx_write_close(struct writer_node *wn)
 273 {
 274         struct private_osx_write_data *powd = wn->private_data;
 275
 276         PARA_INFO_LOG("closing writer node %p\n", wn);
 277         AudioOutputUnitStop(powd->output);
 278         AudioUnitUninitialize(powd->output);
 279         CloseComponent(powd->output);
 280         destroy_buffers(powd);
 281         free(powd);
 282 }
 283
 284 static int need_new_buffer(struct writer_node *wn)
 285 {
 286         struct writer_node_group *wng = wn->wng;
 287         struct private_osx_write_data *powd = wn->private_data;
 288
 289         if (*wng->loaded < sizeof(short))
 290                 return 0;
 291         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 292                 return 0;
 293         return 1;
 294 }
 295
 296 static int osx_write_post_select(__a_unused struct sched *s,
 297                 struct writer_node *wn)
 298 {
 299         struct private_osx_write_data *powd = wn->private_data;
 300         struct writer_node_group *wng = wn->wng;
 301         short *data = (short*)wng->buf;
 302
 303         if (!need_new_buffer(wn))
 304                 return 1;
 305         fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
 306         powd->to = powd->to->next;
 307         wn->written = *wng->loaded;
 308         if (!powd->play) {
 309                 if (AudioOutputUnitStart(powd->output))
 310                         return -E_UNIT_START;
 311                 powd->play = 1;
 312         }
 313         return 1;
 314 }
 315
 316 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 317 {
 318         s->timeout.tv_sec = 0;
 319         s->timeout.tv_usec = 20;
 320         return 1;
 321 }
 322
 323 void osx_write_init(struct writer *w)
 324 {
 325         w->open = osx_write_open;
 326         w->close = osx_write_close;
 327         w->pre_select = osx_write_pre_select;
 328         w->post_select = osx_write_post_select;
 329         w->parse_config = osx_write_parse_config;
 330         w->shutdown = NULL; /* nothing to do */
 331 }