osx_write.c

   1 /*
   2  * Copyright (C) 2006-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file osx_write.c paraslash's output plugin for MacOs */
   8
   9 /*
  10  * based on mosx-mpg123, by Guillaume Outters and Steven A. Kortze
  11  * <skortze@sourceforge.net>
  12  */
  13
  14 #include <sys/types.h>
  15 #include <dirent.h>
  16 #include <CoreAudio/CoreAudio.h>
  17 #include "para.h"
  18 #include "fd.h"
  19 #include "string.h"
  20 #include "list.h"
  21 #include "sched.h"
  22 #include "write.h"
  23 #include "osx_write.cmdline.h"
  24 #include "error.h"
  25
  26
  27 #include <CoreAudio/CoreAudio.h>
  28 #include <AudioUnit/AudioUnit.h>
  29 #include <AudioToolbox/DefaultAudioOutput.h>
  30
  31 /** describes one input buffer for the osx writer */
  32 struct osx_buffer {
  33         /** pointer to the beginning of the buffer */
  34         float *buffer;
  35         /** the size of this buffer */
  36         long size;
  37         /** current position in the buffer */
  38         float *ptr;
  39         /** number of floats not yet consuned */
  40         long remaining;
  41         /** pointer to the next audio buffer */
  42         struct osx_buffer *next;
  43 };
  44
  45 /** data specific to the osx writer */
  46 struct private_osx_write_data {
  47         /** the main control structure for audio data manipulation */
  48         AudioUnit audio_unit;
  49         /** non-zero if playback has started */
  50         char play;
  51         /** callback reads audio data from this buffer */
  52         struct osx_buffer *from;
  53         /** the post_select writes audio data here */
  54         struct osx_buffer *to;
  55         /** sample rate of the current audio stream */
  56         unsigned samplerate;
  57         /** number of channels of the current audio stream */
  58         unsigned channels;
  59 };
  60
  61 static void destroy_buffers(struct private_osx_write_data *powd)
  62 {
  63         struct osx_buffer *ptr;
  64         struct osx_buffer *ptr2;
  65         ptr = powd->to->next;
  66         powd->to->next = NULL;
  67         while (ptr) {
  68                 ptr2 = ptr->next;
  69                 free(ptr->buffer);
  70                 free(ptr);
  71                 ptr = ptr2;
  72         }
  73 }
  74
  75 static void init_buffers(struct writer_node *wn)
  76 {
  77         struct private_osx_write_data *powd = wn->private_data;
  78         struct osx_write_args_info *conf = wn->conf;
  79         struct osx_buffer **ptrptr;
  80         int i;
  81
  82         ptrptr = &powd->to;
  83         for (i = 0; i < conf->numbuffers_arg; i++) {
  84                 *ptrptr = malloc(sizeof(struct osx_buffer));
  85                 (*ptrptr)->size = 0;
  86                 (*ptrptr)->remaining = 0;
  87                 (*ptrptr)->buffer = NULL;
  88                 ptrptr = &(*ptrptr)->next;
  89         }
  90         *ptrptr = powd->from = powd->to;
  91 }
  92
  93 static void fill_buffer(struct osx_buffer *b, short *source, long size)
  94 {
  95         float *dest;
  96
  97         if (b->remaining) /* Non empty buffer, must still be playing */
  98                 return;
  99         if (b->size != size) {
 100                 b->buffer = para_realloc(b->buffer, size * sizeof(float));
 101                 b->size = size;
 102         }
 103         dest = b->buffer;
 104         while (size--)
 105                 *dest++ = (*source++) / 32768.0;
 106         b->ptr = b->buffer;
 107         b->remaining = b->size;
 108 }
 109
 110 static OSStatus osx_callback(void * inClientData,
 111         __a_unused AudioUnitRenderActionFlags *inActionFlags,
 112         __a_unused const AudioTimeStamp *inTimeStamp,
 113         __a_unused  UInt32 inBusNumber,
 114         __a_unused UInt32 inNumFrames,
 115         AudioBufferList *outOutputData)
 116 {
 117         long m, n;
 118         float *dest;
 119         int i;
 120         struct private_osx_write_data *powd = inClientData;
 121
 122 //      PARA_INFO_LOG("%p\n", powd);
 123         for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
 124                 /* what we have to fill */
 125                 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
 126                 dest = outOutputData->mBuffers[i].mData;
 127                 while (m > 0) {
 128                         if ((n = powd->from->remaining) <= 0) {
 129                                 PARA_INFO_LOG("buffer underrun\n");
 130                                 return 0;
 131                         }
 132 //                      PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
 133                         /*
 134                          * we dump what we can. In fact, just the necessary
 135                          * should be sufficient
 136                          */
 137                         if (n > m)
 138                                 n = m;
 139                         memcpy(dest, powd->from->ptr, n * sizeof(float));
 140                         dest += n;
 141                         /* remember all done work */
 142                         m -= n;
 143                         powd->from->ptr += n;
 144                         if ((powd->from->remaining -= n) <= 0)
 145                                 powd->from = powd->from->next;
 146                 }
 147         }
 148         return 0;
 149 }
 150
 151 #ifdef WORDS_BIGENDIAN /* ppc */
 152 #define ENDIAN_FLAGS kLinearPCMFormatFlagIsBigEndian
 153 #else
 154 #define ENDIAN_FLAGS 0
 155 #endif
 156
 157 static int osx_write_open(struct writer_node *wn)
 158 {
 159         struct private_osx_write_data *powd = para_calloc(
 160                 sizeof(struct private_osx_write_data));
 161         ComponentDescription desc;
 162         Component comp;
 163         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 164         AudioStreamBasicDescription format;
 165         int ret;
 166         struct writer_node_group *wng = wn->wng;
 167         struct osx_write_args_info *conf = wn->conf;
 168
 169         wn->private_data = powd;
 170         /* where did that default audio output go? */
 171         desc.componentType = kAudioUnitType_Output;
 172         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 173         /* NOTE: and if default output isn't Apple? */
 174         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 175         desc.componentFlags = 0;
 176         desc.componentFlagsMask = 0;
 177         ret = -E_DEFAULT_COMP;
 178         comp = FindNextComponent(NULL, &desc);
 179         if (!comp)
 180                 goto e0;
 181         ret = -E_OPEN_COMP;
 182         if (OpenAComponent(comp, &powd->audio_unit))
 183                 goto e0;
 184         ret = -E_UNIT_INIT;
 185         if (AudioUnitInitialize(powd->audio_unit))
 186                 goto e1;
 187         powd->play = 0;
 188         /* Hmmm, let's choose PCM format */
 189         /* We tell the Output Unit what format we're going to supply data to it.
 190          * This is necessary if you're providing data through an input callback
 191          * AND you want the DefaultOutputUnit to do any format conversions
 192          * necessary from your format to the device's format.
 193          */
 194         if (!conf->samplerate_given && wng->samplerate)
 195                 powd->samplerate = *wng->samplerate;
 196         else
 197                 powd->samplerate = conf->samplerate_arg;
 198         format.mSampleRate = powd->samplerate;
 199         /* The specific encoding type of audio stream*/
 200         format.mFormatID = kAudioFormatLinearPCM;
 201         /* flags specific to each format */
 202         format.mFormatFlags = kLinearPCMFormatFlagIsFloat
 203                 | kLinearPCMFormatFlagIsPacked
 204                 | ENDIAN_FLAGS;
 205         if (!conf->channels_given && wng->channels)
 206                 powd->channels = *wng->channels;
 207         else
 208                 powd->channels = conf->channels_arg;
 209         format.mChannelsPerFrame = powd->channels;
 210         format.mFramesPerPacket = 1;
 211         format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
 212         format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
 213         /* one of the most constant constants of the whole computer history */
 214         format.mBitsPerChannel = sizeof(float) * 8;
 215         ret = -E_STREAM_FORMAT;
 216         if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_StreamFormat,
 217                         kAudioUnitScope_Input, 0, &format,
 218                         sizeof(AudioStreamBasicDescription)))
 219                 goto e2;
 220         init_buffers(wn);
 221         ret = -E_ADD_CALLBACK;
 222         if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_SetRenderCallback,
 223                         kAudioUnitScope_Input, 0, &inputCallback,
 224                         sizeof(inputCallback)) < 0)
 225                 goto e3;
 226         return 1;
 227 e3:
 228         destroy_buffers(powd);
 229 e2:
 230         AudioUnitUninitialize(powd->audio_unit);
 231 e1:
 232         CloseComponent(powd->audio_unit);
 233 e0:
 234         return ret;
 235 }
 236
 237 __malloc static void *osx_write_parse_config(const char *options)
 238 {
 239         struct osx_write_args_info *conf
 240                 = para_calloc(sizeof(struct osx_write_args_info));
 241         PARA_INFO_LOG("options: %s\n", options);
 242         int ret = osx_cmdline_parser_string(options, conf, "osx_write");
 243         if (ret)
 244                 goto err_out;
 245         return conf;
 246 err_out:
 247         free(conf);
 248         return NULL;
 249
 250 }
 251
 252 static void osx_write_close(struct writer_node *wn)
 253 {
 254         struct private_osx_write_data *powd = wn->private_data;
 255
 256         PARA_INFO_LOG("closing writer node %p\n", wn);
 257         AudioOutputUnitStop(powd->audio_unit);
 258         AudioUnitUninitialize(powd->audio_unit);
 259         CloseComponent(powd->audio_unit);
 260         destroy_buffers(powd);
 261         free(powd);
 262 }
 263
 264 static int need_new_buffer(struct writer_node *wn)
 265 {
 266         struct writer_node_group *wng = wn->wng;
 267         struct private_osx_write_data *powd = wn->private_data;
 268
 269         if (*wng->loaded < sizeof(short))
 270                 return 0;
 271         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 272                 return 0;
 273         return 1;
 274 }
 275
 276 static int osx_write_post_select(__a_unused struct sched *s,
 277                 struct writer_node *wn)
 278 {
 279         struct private_osx_write_data *powd = wn->private_data;
 280         struct writer_node_group *wng = wn->wng;
 281         short *data = (short*)wng->buf;
 282
 283         if (!need_new_buffer(wn))
 284                 return 1;
 285         fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
 286         powd->to = powd->to->next;
 287         wn->written = *wng->loaded;
 288         if (!powd->play) {
 289                 if (AudioOutputUnitStart(powd->audio_unit))
 290                         return -E_UNIT_START;
 291                 powd->play = 1;
 292         }
 293         return 1;
 294 }
 295
 296 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 297 {
 298         struct private_osx_write_data *powd = wn->private_data;
 299         struct writer_node_group *wng = wn->wng;
 300         size_t numbytes = powd->to->remaining * sizeof(short);
 301         struct timeval tmp = {.tv_sec = 1, .tv_usec = 0}, delay = tmp;
 302         unsigned long divisor;
 303
 304         if (!numbytes && *wng->loaded >= sizeof(short))
 305                 goto min_delay; /* there's a buffer to fill */
 306         if (!numbytes)
 307                 return 1;
 308         divisor = powd->samplerate * powd->channels * 2 / numbytes;
 309         if (divisor)
 310                 tv_divide(divisor, &tmp, &delay);
 311         if (tv_diff(&s->timeout, &delay, NULL) > 0)
 312                 s->timeout = delay;
 313 //      PARA_DEBUG_LOG("delay: %lu:%lu\n", (long unsigned) s->timeout.tv_sec,
 314 //              (long unsigned) s->timeout.tv_usec);
 315         return 1;
 316 min_delay:
 317         PARA_DEBUG_LOG("%s\n", "minimal delay");
 318         s->timeout.tv_sec = 0;
 319         s->timeout.tv_usec = 1;
 320         return 1;
 321 }
 322
 323 /** the init function of the osx writer */
 324 void osx_write_init(struct writer *w)
 325 {
 326         w->open = osx_write_open;
 327         w->close = osx_write_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 }