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