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
  41 /** describes one input buffer for the osx writer */
  42 struct osx_buffer {
  43         /** pointer to the beginning of the buffer */
  44         float *buffer;
  45         /** the size of this buffer */
  46         long size;
  47         /* current position in the buffer */
  48         float *ptr;
  49         /** number of floats not yet consuned */
  50         long remaining;
  51         /** pointer to the next audio buffer */
  52         struct osx_buffer *next;
  53 };
  54
  55 struct private_osx_write_data {
  56         /** the main control structure for audio data manipulation */
  57         AudioUnit audio_unit;
  58         /** non-zero if playback has started */
  59         char play;
  60         /** callback reads audio data from this buffer */
  61         struct osx_buffer *from;
  62         /* the post_select writes audio data here */
  63         struct osx_buffer *to;
  64         /** sample rate of the current audio stream */
  65         unsigned samplerate;
  66         /** number of channels of the current audio stream */
  67         unsigned channels;
  68 };
  69
  70 static void destroy_buffers(struct private_osx_write_data *powd)
  71 {
  72         struct osx_buffer *ptr;
  73         struct 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 writer_node *wn)
  85 {
  86         struct private_osx_write_data *powd = wn->private_data;
  87         struct osx_write_args_info *conf = wn->conf;
  88         struct osx_buffer **ptrptr;
  89         int i;
  90
  91         ptrptr = &powd->to;
  92         for (i = 0; i < conf->numbuffers_arg; i++) {
  93                 *ptrptr = malloc(sizeof(struct osx_buffer));
  94                 (*ptrptr)->size = 0;
  95                 (*ptrptr)->remaining = 0;
  96                 (*ptrptr)->buffer = NULL;
  97                 ptrptr = &(*ptrptr)->next;
  98         }
  99         *ptrptr = powd->from = powd->to;
 100 }
 101
 102 static void fill_buffer(struct 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         if (b->size != size) {
 109                 b->buffer = para_realloc(b->buffer, size * sizeof(float));
 110                 b->size = size;
 111         }
 112         dest = b->buffer;
 113         while (size--) {
 114                 char *tmp = (char *)source;
 115                 char c = *tmp;
 116                 *tmp = *(tmp + 1);
 117                 *(tmp + 1) = c;
 118                 /* *dest++ = ((*source++) + 32768) / 65536.0; */
 119                 *dest++ = (*source++) / 32768.0;
 120         }
 121         b->ptr = b->buffer;
 122         b->remaining = b->size;
 123 }
 124
 125 static OSStatus osx_callback(void * inClientData,
 126         __a_unused AudioUnitRenderActionFlags *inActionFlags,
 127         __a_unused const AudioTimeStamp *inTimeStamp,
 128         __a_unused  UInt32 inBusNumber,
 129         __a_unused UInt32 inNumFrames,
 130         AudioBufferList *outOutputData)
 131 {
 132         long m, n;
 133         float *dest;
 134         int i;
 135         struct private_osx_write_data *powd = inClientData;
 136
 137 //      PARA_INFO_LOG("%p\n", powd);
 138         for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
 139                 /* what we have to fill */
 140                 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
 141                 dest = outOutputData->mBuffers[i].mData;
 142                 while (m > 0) {
 143                         if ((n = powd->from->remaining) <= 0) {
 144                                 PARA_INFO_LOG("%s", "buffer underrun\n");
 145                                 /* no more bytes in the current read buffer! */
 146                                 while ((n = powd->from->remaining) <= 0)
 147                                         /* wait for the results */
 148                                         usleep(2000);
 149                         }
 150 //                      PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
 151                         /*
 152                          * we dump what we can. In fact, just the necessary
 153                          * should be sufficient
 154                          */
 155                         if (n > m)
 156                                 n = m;
 157                         memcpy(dest, powd->from->ptr, n * sizeof(float));
 158                         dest += n;
 159                         /* remember all done work */
 160                         m -= n;
 161                         powd->from->ptr += n;
 162                         if ((powd->from->remaining -= n) <= 0)
 163                                 powd->from = powd->from->next;
 164                 }
 165         }
 166         return 0;
 167 }
 168
 169 static int osx_write_open(struct writer_node *wn)
 170 {
 171         struct private_osx_write_data *powd = para_calloc(
 172                 sizeof(struct private_osx_write_data));
 173         ComponentDescription desc;
 174         Component comp;
 175         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 176         AudioStreamBasicDescription format;
 177         int ret;
 178         struct writer_node_group *wng = wn->wng;
 179         struct osx_write_args_info *conf = wn->conf;
 180
 181         wn->private_data = powd;
 182         /* where did that default audio output go? */
 183         desc.componentType = kAudioUnitType_Output;
 184         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 185         /* NOTE: and if default output isn't Apple? */
 186         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 187         desc.componentFlags = 0;
 188         desc.componentFlagsMask = 0;
 189         ret = -E_DEFAULT_COMP;
 190         comp = FindNextComponent(NULL, &desc);
 191         if (!comp)
 192                 goto e0;
 193         ret = -E_OPEN_COMP;
 194         if (OpenAComponent(comp, &powd->audio_unit))
 195                 goto e0;
 196         ret = -E_UNIT_INIT;
 197         if (AudioUnitInitialize(powd->audio_unit))
 198                 goto e1;
 199         powd->play = 0;
 200         /* Hmmm, let's choose PCM format */
 201         /* We tell the Output Unit what format we're going to supply data to it.
 202          * This is necessary if you're providing data through an input callback
 203          * AND you want the DefaultOutputUnit to do any format conversions
 204          * necessary from your format to the device's format.
 205          */
 206         if (!conf->samplerate_given && wng->samplerate)
 207                 powd->samplerate = *wng->samplerate;
 208         else
 209                 powd->samplerate = conf->samplerate_arg;
 210         format.mSampleRate = powd->samplerate;
 211         /* The specific encoding type of audio stream*/
 212         format.mFormatID = kAudioFormatLinearPCM;
 213         /* flags specific to each format */
 214         format.mFormatFlags = kLinearPCMFormatFlagIsFloat
 215                 | kLinearPCMFormatFlagIsPacked
 216                 | kLinearPCMFormatFlagIsBigEndian;
 217         if (!conf->channels_given && wng->channels)
 218                 powd->channels = *wng->channels;
 219         else
 220                 powd->channels = conf->channels_arg;
 221         format.mChannelsPerFrame = powd->channels;
 222         format.mFramesPerPacket = 1;
 223         format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
 224         format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
 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->audio_unit, kAudioUnitProperty_StreamFormat,
 229                         kAudioUnitScope_Input, 0, &format,
 230                         sizeof(AudioStreamBasicDescription)))
 231                 goto e2;
 232         init_buffers(wn);
 233         ret = -E_ADD_CALLBACK;
 234         if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_SetRenderCallback,
 235                         kAudioUnitScope_Input, 0, &inputCallback,
 236                         sizeof(inputCallback)) < 0)
 237                 goto e3;
 238         return 1;
 239 e3:
 240         destroy_buffers(powd);
 241 e2:
 242         AudioUnitUninitialize(powd->audio_unit);
 243 e1:
 244         CloseComponent(powd->audio_unit);
 245 e0:
 246         return ret;
 247 }
 248
 249 __malloc void *osx_write_parse_config(char *options)
 250 {
 251         struct osx_write_args_info *conf
 252                 = para_calloc(sizeof(struct osx_write_args_info));
 253         PARA_INFO_LOG("options: %s\n", options);
 254         int ret = osx_cmdline_parser_string(options, conf, "osx_write");
 255         if (ret)
 256                 goto err_out;
 257         return conf;
 258 err_out:
 259         free(conf);
 260         return NULL;
 261
 262 }
 263
 264 static void osx_write_close(struct writer_node *wn)
 265 {
 266         struct private_osx_write_data *powd = wn->private_data;
 267
 268         PARA_INFO_LOG("closing writer node %p\n", wn);
 269         AudioOutputUnitStop(powd->audio_unit);
 270         AudioUnitUninitialize(powd->audio_unit);
 271         CloseComponent(powd->audio_unit);
 272         destroy_buffers(powd);
 273         free(powd);
 274 }
 275
 276 static int need_new_buffer(struct writer_node *wn)
 277 {
 278         struct writer_node_group *wng = wn->wng;
 279         struct private_osx_write_data *powd = wn->private_data;
 280
 281         if (*wng->loaded < sizeof(short))
 282                 return 0;
 283         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 284                 return 0;
 285         return 1;
 286 }
 287
 288 static int osx_write_post_select(__a_unused struct sched *s,
 289                 struct writer_node *wn)
 290 {
 291         struct private_osx_write_data *powd = wn->private_data;
 292         struct writer_node_group *wng = wn->wng;
 293         short *data = (short*)wng->buf;
 294
 295         if (!need_new_buffer(wn))
 296                 return 1;
 297         fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
 298         powd->to = powd->to->next;
 299         wn->written = *wng->loaded;
 300         if (!powd->play) {
 301                 if (AudioOutputUnitStart(powd->audio_unit))
 302                         return -E_UNIT_START;
 303                 powd->play = 1;
 304         }
 305         return 1;
 306 }
 307
 308 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 309 {
 310         struct private_osx_write_data *powd = wn->private_data;
 311         struct writer_node_group *wng = wn->wng;
 312         size_t numbytes = powd->to->remaining * sizeof(short);
 313         struct timeval tmp = {.tv_sec = 1, .tv_usec = 0}, delay = tmp;
 314         unsigned long divisor;
 315
 316         if (!numbytes && *wng->loaded >= sizeof(short))
 317                 goto min_delay; /* there's a buffer to fill */
 318         if (!numbytes)
 319                 return 1;
 320         divisor = powd->samplerate * powd->channels * 2 / numbytes;
 321         if (divisor)
 322                 tv_divide(divisor, &tmp, &delay);
 323         if (tv_diff(&s->timeout, &delay, NULL) > 0)
 324                 s->timeout = delay;
 325 //      PARA_DEBUG_LOG("delay: %lu:%lu\n", (long unsigned) s->timeout.tv_sec,
 326 //              (long unsigned) s->timeout.tv_usec);
 327         return 1;
 328 min_delay:
 329         PARA_DEBUG_LOG("%s\n", "minimal delay");
 330         s->timeout.tv_sec = 0;
 331         s->timeout.tv_usec = 1;
 332         return 1;
 333 }
 334
 335 /** the init function of the osx writer */
 336 void osx_write_init(struct writer *w)
 337 {
 338         w->open = osx_write_open;
 339         w->close = osx_write_close;
 340         w->pre_select = osx_write_pre_select;
 341         w->post_select = osx_write_post_select;
 342         w->parse_config = osx_write_parse_config;
 343         w->shutdown = NULL; /* nothing to do */
 344 }