osx_write.c

   1 /*
   2  * Copyright (C) 2006-2007 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 <CoreAudio/CoreAudio.h>
  15 #include "para.h"
  16 #include "fd.h"
  17 #include "string.h"
  18 #include "list.h"
  19 #include "sched.h"
  20 #include "write.h"
  21 #include "osx_write.cmdline.h"
  22 #include "error.h"
  23
  24
  25 #include <CoreAudio/CoreAudio.h>
  26 #include <AudioUnit/AudioUnit.h>
  27 #include <AudioToolbox/DefaultAudioOutput.h>
  28
  29 /** describes one input buffer for the osx writer */
  30 struct osx_buffer {
  31         /** pointer to the beginning of the buffer */
  32         float *buffer;
  33         /** the size of this buffer */
  34         long size;
  35         /** current position in the buffer */
  36         float *ptr;
  37         /** number of floats not yet consuned */
  38         long remaining;
  39         /** pointer to the next audio buffer */
  40         struct osx_buffer *next;
  41 };
  42
  43 /** data specific to the osx writer */
  44 struct private_osx_write_data {
  45         /** the main control structure for audio data manipulation */
  46         AudioUnit audio_unit;
  47         /** non-zero if playback has started */
  48         char play;
  49         /** callback reads audio data from this buffer */
  50         struct osx_buffer *from;
  51         /** the post_select writes audio data here */
  52         struct osx_buffer *to;
  53         /** sample rate of the current audio stream */
  54         unsigned samplerate;
  55         /** number of channels of the current audio stream */
  56         unsigned channels;
  57 };
  58
  59 static void destroy_buffers(struct private_osx_write_data *powd)
  60 {
  61         struct osx_buffer *ptr;
  62         struct osx_buffer *ptr2;
  63         ptr = powd->to->next;
  64         powd->to->next = NULL;
  65         while (ptr) {
  66                 ptr2 = ptr->next;
  67                 free(ptr->buffer);
  68                 free(ptr);
  69                 ptr = ptr2;
  70         }
  71 }
  72
  73 static void init_buffers(struct writer_node *wn)
  74 {
  75         struct private_osx_write_data *powd = wn->private_data;
  76         struct osx_write_args_info *conf = wn->conf;
  77         struct osx_buffer **ptrptr;
  78         int i;
  79
  80         ptrptr = &powd->to;
  81         for (i = 0; i < conf->numbuffers_arg; i++) {
  82                 *ptrptr = malloc(sizeof(struct osx_buffer));
  83                 (*ptrptr)->size = 0;
  84                 (*ptrptr)->remaining = 0;
  85                 (*ptrptr)->buffer = NULL;
  86                 ptrptr = &(*ptrptr)->next;
  87         }
  88         *ptrptr = powd->from = powd->to;
  89 }
  90
  91 static void fill_buffer(struct osx_buffer *b, short *source, long size)
  92 {
  93         float *dest;
  94
  95         if (b->remaining) /* Non empty buffer, must still be playing */
  96                 return;
  97         if (b->size != size) {
  98                 b->buffer = para_realloc(b->buffer, size * sizeof(float));
  99                 b->size = size;
 100         }
 101         dest = b->buffer;
 102         while (size--)
 103                 *dest++ = (*source++) / 32768.0;
 104         b->ptr = b->buffer;
 105         b->remaining = b->size;
 106 }
 107
 108 static OSStatus osx_callback(void * inClientData,
 109         __a_unused AudioUnitRenderActionFlags *inActionFlags,
 110         __a_unused const AudioTimeStamp *inTimeStamp,
 111         __a_unused  UInt32 inBusNumber,
 112         __a_unused UInt32 inNumFrames,
 113         AudioBufferList *outOutputData)
 114 {
 115         long m, n;
 116         float *dest;
 117         int i;
 118         struct private_osx_write_data *powd = inClientData;
 119
 120 //      PARA_INFO_LOG("%p\n", powd);
 121         for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
 122                 /* what we have to fill */
 123                 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
 124                 dest = outOutputData->mBuffers[i].mData;
 125                 while (m > 0) {
 126                         if ((n = powd->from->remaining) <= 0) {
 127                                 PARA_INFO_LOG("%s", "buffer underrun\n");
 128                                 return 0;
 129                         }
 130 //                      PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
 131                         /*
 132                          * we dump what we can. In fact, just the necessary
 133                          * should be sufficient
 134                          */
 135                         if (n > m)
 136                                 n = m;
 137                         memcpy(dest, powd->from->ptr, n * sizeof(float));
 138                         dest += n;
 139                         /* remember all done work */
 140                         m -= n;
 141                         powd->from->ptr += n;
 142                         if ((powd->from->remaining -= n) <= 0)
 143                                 powd->from = powd->from->next;
 144                 }
 145         }
 146         return 0;
 147 }
 148
 149 static int osx_write_open(struct writer_node *wn)
 150 {
 151         struct private_osx_write_data *powd = para_calloc(
 152                 sizeof(struct private_osx_write_data));
 153         ComponentDescription desc;
 154         Component comp;
 155         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 156         AudioStreamBasicDescription format;
 157         int ret;
 158         struct writer_node_group *wng = wn->wng;
 159         struct osx_write_args_info *conf = wn->conf;
 160
 161         wn->private_data = powd;
 162         /* where did that default audio output go? */
 163         desc.componentType = kAudioUnitType_Output;
 164         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 165         /* NOTE: and if default output isn't Apple? */
 166         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 167         desc.componentFlags = 0;
 168         desc.componentFlagsMask = 0;
 169         ret = -E_DEFAULT_COMP;
 170         comp = FindNextComponent(NULL, &desc);
 171         if (!comp)
 172                 goto e0;
 173         ret = -E_OPEN_COMP;
 174         if (OpenAComponent(comp, &powd->audio_unit))
 175                 goto e0;
 176         ret = -E_UNIT_INIT;
 177         if (AudioUnitInitialize(powd->audio_unit))
 178                 goto e1;
 179         powd->play = 0;
 180         /* Hmmm, let's choose PCM format */
 181         /* We tell the Output Unit what format we're going to supply data to it.
 182          * This is necessary if you're providing data through an input callback
 183          * AND you want the DefaultOutputUnit to do any format conversions
 184          * necessary from your format to the device's format.
 185          */
 186         if (!conf->samplerate_given && wng->samplerate)
 187                 powd->samplerate = *wng->samplerate;
 188         else
 189                 powd->samplerate = conf->samplerate_arg;
 190         format.mSampleRate = powd->samplerate;
 191         /* The specific encoding type of audio stream*/
 192         format.mFormatID = kAudioFormatLinearPCM;
 193         /* flags specific to each format */
 194         format.mFormatFlags = kLinearPCMFormatFlagIsFloat
 195                 | kLinearPCMFormatFlagIsPacked
 196                 | kLinearPCMFormatFlagIsBigEndian;
 197         if (!conf->channels_given && wng->channels)
 198                 powd->channels = *wng->channels;
 199         else
 200                 powd->channels = conf->channels_arg;
 201         format.mChannelsPerFrame = powd->channels;
 202         format.mFramesPerPacket = 1;
 203         format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
 204         format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
 205         /* one of the most constant constants of the whole computer history */
 206         format.mBitsPerChannel = sizeof(float) * 8;
 207         ret = -E_STREAM_FORMAT;
 208         if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_StreamFormat,
 209                         kAudioUnitScope_Input, 0, &format,
 210                         sizeof(AudioStreamBasicDescription)))
 211                 goto e2;
 212         init_buffers(wn);
 213         ret = -E_ADD_CALLBACK;
 214         if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_SetRenderCallback,
 215                         kAudioUnitScope_Input, 0, &inputCallback,
 216                         sizeof(inputCallback)) < 0)
 217                 goto e3;
 218         return 1;
 219 e3:
 220         destroy_buffers(powd);
 221 e2:
 222         AudioUnitUninitialize(powd->audio_unit);
 223 e1:
 224         CloseComponent(powd->audio_unit);
 225 e0:
 226         return ret;
 227 }
 228
 229 __malloc static void *osx_write_parse_config(const char *options)
 230 {
 231         struct osx_write_args_info *conf
 232                 = para_calloc(sizeof(struct osx_write_args_info));
 233         PARA_INFO_LOG("options: %s\n", options);
 234         int ret = osx_cmdline_parser_string(options, conf, "osx_write");
 235         if (ret)
 236                 goto err_out;
 237         return conf;
 238 err_out:
 239         free(conf);
 240         return NULL;
 241
 242 }
 243
 244 static void osx_write_close(struct writer_node *wn)
 245 {
 246         struct private_osx_write_data *powd = wn->private_data;
 247
 248         PARA_INFO_LOG("closing writer node %p\n", wn);
 249         AudioOutputUnitStop(powd->audio_unit);
 250         AudioUnitUninitialize(powd->audio_unit);
 251         CloseComponent(powd->audio_unit);
 252         destroy_buffers(powd);
 253         free(powd);
 254 }
 255
 256 static int need_new_buffer(struct writer_node *wn)
 257 {
 258         struct writer_node_group *wng = wn->wng;
 259         struct private_osx_write_data *powd = wn->private_data;
 260
 261         if (*wng->loaded < sizeof(short))
 262                 return 0;
 263         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 264                 return 0;
 265         return 1;
 266 }
 267
 268 static int osx_write_post_select(__a_unused struct sched *s,
 269                 struct writer_node *wn)
 270 {
 271         struct private_osx_write_data *powd = wn->private_data;
 272         struct writer_node_group *wng = wn->wng;
 273         short *data = (short*)wng->buf;
 274
 275         if (!need_new_buffer(wn))
 276                 return 1;
 277         fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
 278         powd->to = powd->to->next;
 279         wn->written = *wng->loaded;
 280         if (!powd->play) {
 281                 if (AudioOutputUnitStart(powd->audio_unit))
 282                         return -E_UNIT_START;
 283                 powd->play = 1;
 284         }
 285         return 1;
 286 }
 287
 288 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 289 {
 290         struct private_osx_write_data *powd = wn->private_data;
 291         struct writer_node_group *wng = wn->wng;
 292         size_t numbytes = powd->to->remaining * sizeof(short);
 293         struct timeval tmp = {.tv_sec = 1, .tv_usec = 0}, delay = tmp;
 294         unsigned long divisor;
 295
 296         if (!numbytes && *wng->loaded >= sizeof(short))
 297                 goto min_delay; /* there's a buffer to fill */
 298         if (!numbytes)
 299                 return 1;
 300         divisor = powd->samplerate * powd->channels * 2 / numbytes;
 301         if (divisor)
 302                 tv_divide(divisor, &tmp, &delay);
 303         if (tv_diff(&s->timeout, &delay, NULL) > 0)
 304                 s->timeout = delay;
 305 //      PARA_DEBUG_LOG("delay: %lu:%lu\n", (long unsigned) s->timeout.tv_sec,
 306 //              (long unsigned) s->timeout.tv_usec);
 307         return 1;
 308 min_delay:
 309         PARA_DEBUG_LOG("%s\n", "minimal delay");
 310         s->timeout.tv_sec = 0;
 311         s->timeout.tv_usec = 1;
 312         return 1;
 313 }
 314
 315 /** the init function of the osx writer */
 316 void osx_write_init(struct writer *w)
 317 {
 318         w->open = osx_write_open;
 319         w->close = osx_write_close;
 320         w->pre_select = osx_write_pre_select;
 321         w->post_select = osx_write_post_select;
 322         w->parse_config = osx_write_parse_config;
 323         w->shutdown = NULL; /* nothing to do */
 324 }