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 /*
  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_writer_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_writer_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                 if (ptr->buffer)
  79                         free(ptr->buffer);
  80                 free(ptr);
  81                 ptr = ptr2;
  82         }
  83 }
  84
  85 static void init_buffers(struct private_osx_writer_data *powd)
  86 {
  87         int i;
  88
  89         osx_buffer ** ptrptr;
  90         ptrptr = &powd->to;
  91         for (i = 0; i < NUMBER_BUFFERS; i++) {
  92                 *ptrptr = malloc(sizeof(osx_buffer));
  93                 (*ptrptr)->size = 0;
  94                 (*ptrptr)->remaining = 0;
  95                 (*ptrptr)->buffer = NULL;
  96                 ptrptr = &(*ptrptr)->next;
  97                 /* This buffer is ready for filling (of course, it is empty!) */
  98         }
  99         *ptrptr = powd->from = powd->to;
 100 }
 101
 102 static void fill_buffer(osx_buffer *b, short *source, long size)
 103 {
 104         float *dest;
 105
 106         if (b->remaining) /* Non empty buffer, must still be playing */
 107                 return;
 108         PARA_INFO_LOG("%ld\n", size);
 109         if (b->size != size) {
 110                 /*
 111                  * Hey! What's that? Coudn't this buffer size be fixed
 112                  * once (well, perhaps we just didn't allocate it yet)
 113                  */
 114                 if (b->buffer)
 115                         free(b->buffer);
 116                 b->buffer = malloc(size * sizeof(float));
 117                 b->size = size;
 118         }
 119         dest = b->buffer;
 120         while (size--) {
 121                 char *tmp = (char *)source;
 122                 char c = *tmp;
 123                 *tmp = *(tmp + 1);
 124                 *(tmp + 1) = c;
 125                 /* *dest++ = ((*source++) + 32768) / 65536.0; */
 126                 *dest++ = (*source++) / 32768.0;
 127         }
 128         b->ptr = b->buffer;
 129         b->remaining = b->size;
 130 }
 131
 132 static OSStatus osx_callback(void * inClientData,
 133         __a_unused AudioUnitRenderActionFlags *inActionFlags,
 134         __a_unused const AudioTimeStamp *inTimeStamp,
 135         __a_unused  UInt32 inBusNumber,
 136         __a_unused UInt32 inNumFrames,
 137         AudioBufferList *outOutputData)
 138 {
 139         long m, n;
 140         float *dest;
 141         int i;
 142         struct private_osx_writer_data *powd = inClientData;
 143
 144 //      PARA_INFO_LOG("%p\n", powd);
 145         for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
 146                 /* what we have to fill */
 147                 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
 148                 dest = outOutputData->mBuffers[i].mData;
 149                 while (m > 0) {
 150                         if ((n = powd->from->remaining) <= 0) {
 151                                 PARA_INFO_LOG("%s", "buffer underrun\n");
 152                                 /* no more bytes in the current read buffer! */
 153                                 while ((n = powd->from->remaining) <= 0)
 154                                         /* wait for the results */
 155                                         usleep(2000);
 156                         }
 157                         PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
 158                         /*
 159                          * we dump what we can. In fact, just the necessary
 160                          * should be sufficient
 161                          */
 162                         if (n > m)
 163                                 n = m;
 164                         memcpy(dest, powd->from->ptr, n * sizeof(float));
 165                         dest += n;
 166                         /* remember all done work */
 167                         m -= n;
 168                         powd->from->ptr += n;
 169                         if ((powd->from->remaining -= n) <= 0)
 170                                 powd->from = powd->from->next;
 171                 }
 172         }
 173         return 0;
 174 }
 175
 176 static int osx_writer_open(struct writer_node *wn)
 177 {
 178         struct private_osx_writer_data *powd = para_calloc(
 179                 sizeof(struct private_osx_writer_data));
 180         ComponentDescription desc;
 181         Component comp;
 182         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 183         AudioStreamBasicDescription format;
 184         int ret;
 185         struct writer_node_group *wng = wn->wng;
 186         struct osx_write_args_info *conf = wn->conf;
 187
 188         wn->private_data = powd;
 189         /* where did that default audio output go? */
 190         desc.componentType = kAudioUnitType_Output;
 191         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 192         /* NOTE: and if default output isn't Apple? */
 193         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 194         desc.componentFlags = 0;
 195         desc.componentFlagsMask = 0;
 196         ret = -E_DEFAULT_COMP;
 197         comp = FindNextComponent(NULL, &desc);
 198         if (!comp)
 199                 goto e0;
 200         ret = -E_OPEN_COMP;
 201         if (OpenAComponent(comp, &powd->output))
 202                 goto e0;
 203         ret = -E_UNIT_INIT;
 204         if (AudioUnitInitialize(powd->output))
 205                 goto e1;
 206         powd->size = 0;
 207         powd->ptr = NULL;
 208         powd->play = 0;
 209         /* Hmmm, let's choose PCM format */
 210         /* We tell the Output Unit what format we're going to supply data to it.
 211          * This is necessary if you're providing data through an input callback
 212          * AND you want the DefaultOutputUnit to do any format conversions
 213          * necessary from your format to the device's format.
 214          */
 215         if (!conf->samplerate_given && wng->samplerate)
 216                 powd->samplerate = *wng->samplerate;
 217         else
 218                 powd->samplerate = conf->samplerate_arg;
 219         format.mSampleRate = powd->samplerate;
 220         /* The specific encoding type of audio stream*/
 221         format.mFormatID = kAudioFormatLinearPCM;
 222         /* flags specific to each format */
 223         format.mFormatFlags = kLinearPCMFormatFlagIsFloat
 224                 | kLinearPCMFormatFlagIsPacked
 225                 | kLinearPCMFormatFlagIsBigEndian;
 226         if (!conf->channels_given && wng->channels)
 227                 powd->channels = *wng->channels;
 228         else
 229                 powd->channels = conf->channels_arg;
 230         format.mChannelsPerFrame = powd->channels;
 231         format.mFramesPerPacket = 1;
 232         format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
 233         format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
 234         /* one of the most constant constants of the whole computer history */
 235         format.mBitsPerChannel = sizeof(float) * 8;
 236         ret = -E_STREAM_FORMAT;
 237         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
 238                         kAudioUnitScope_Input, 0, &format,
 239                         sizeof(AudioStreamBasicDescription)))
 240                 goto e2;
 241         init_buffers(powd);
 242         ret = -E_ADD_CALLBACK;
 243         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
 244                         kAudioUnitScope_Input, 0, &inputCallback,
 245                         sizeof(inputCallback)) < 0)
 246                 goto e3;
 247         return 1;
 248 e3:
 249         destroy_buffers(powd);
 250 e2:
 251         AudioUnitUninitialize(powd->output);
 252 e1:
 253         CloseComponent(powd->output);
 254 e0:
 255         return ret;
 256 }
 257
 258 __malloc void *osx_write_parse_config(char *options)
 259 {
 260         struct osx_write_args_info *conf
 261                 = para_calloc(sizeof(struct osx_write_args_info));
 262         PARA_INFO_LOG("options: %s\n", options);
 263         int ret = osx_cmdline_parser_string(options, conf, "osx_write");
 264         if (ret)
 265                 goto err_out;
 266         return conf;
 267 err_out:
 268         free(conf);
 269         return NULL;
 270
 271 }
 272
 273 static void osx_writer_close(struct writer_node *wn)
 274 {
 275         struct private_osx_writer_data *powd = wn->private_data;
 276
 277         PARA_INFO_LOG("closing writer node %p\n", wn);
 278         AudioOutputUnitStop(powd->output);
 279         AudioUnitUninitialize(powd->output);
 280         CloseComponent(powd->output);
 281         destroy_buffers(powd);
 282         free(powd);
 283 }
 284
 285 static int need_new_buffer(struct writer_node *wn)
 286 {
 287         struct writer_node_group *wng = wn->wng;
 288         struct private_osx_writer_data *powd = wn->private_data;
 289
 290         if (*wng->loaded < sizeof(short))
 291                 return 0;
 292         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 293                 return 0;
 294         return 1;
 295 }
 296
 297 static int osx_write_post_select(__a_unused struct sched *s,
 298                 struct writer_node *wn)
 299 {
 300         struct private_osx_writer_data *powd = wn->private_data;
 301         struct writer_node_group *wng = wn->wng;
 302         short *data = (short*)wng->buf;
 303
 304         if (!need_new_buffer(wn))
 305                 return 1;
 306         fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
 307         powd->to = powd->to->next;
 308         wn->written = *wng->loaded;
 309         if (!powd->play) {
 310                 if (AudioOutputUnitStart(powd->output))
 311                         return -E_UNIT_START;
 312                 powd->play = 1;
 313         }
 314         return 1;
 315 }
 316
 317 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 318 {
 319         s->timeout.tv_sec = 0;
 320         s->timeout.tv_usec = 20;
 321         return 1;
 322 }
 323
 324 void osx_writer_init(struct writer *w)
 325 {
 326         w->open = osx_writer_open;
 327         w->close = osx_writer_close;
 328         w->pre_select = osx_write_pre_select;
 329         w->post_select = osx_write_post_select;
 330         w->parse_config = osx_write_parse_config;
 331         w->shutdown = NULL; /* nothing to do */
 332 }