osx_write.c

   1 /*
   2  * Copyright (C) 2006-2007 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 /** data specific to the osx writer */
  56 struct private_osx_write_data {
  57         /** the main control structure for audio data manipulation */
  58         AudioUnit audio_unit;
  59         /** non-zero if playback has started */
  60         char play;
  61         /** callback reads audio data from this buffer */
  62         struct osx_buffer *from;
  63         /** the post_select writes audio data here */
  64         struct osx_buffer *to;
  65         /** sample rate of the current audio stream */
  66         unsigned samplerate;
  67         /** number of channels of the current audio stream */
  68         unsigned channels;
  69 };
  70
  71 static void destroy_buffers(struct private_osx_write_data *powd)
  72 {
  73         struct osx_buffer *ptr;
  74         struct osx_buffer *ptr2;
  75         ptr = powd->to->next;
  76         powd->to->next = NULL;
  77         while (ptr) {
  78                 ptr2 = ptr->next;
  79                 free(ptr->buffer);
  80                 free(ptr);
  81                 ptr = ptr2;
  82         }
  83 }
  84
  85 static void init_buffers(struct writer_node *wn)
  86 {
  87         struct private_osx_write_data *powd = wn->private_data;
  88         struct osx_write_args_info *conf = wn->conf;
  89         struct osx_buffer **ptrptr;
  90         int i;
  91
  92         ptrptr = &powd->to;
  93         for (i = 0; i < conf->numbuffers_arg; i++) {
  94                 *ptrptr = malloc(sizeof(struct osx_buffer));
  95                 (*ptrptr)->size = 0;
  96                 (*ptrptr)->remaining = 0;
  97                 (*ptrptr)->buffer = NULL;
  98                 ptrptr = &(*ptrptr)->next;
  99         }
 100         *ptrptr = powd->from = powd->to;
 101 }
 102
 103 static void fill_buffer(struct osx_buffer *b, short *source, long size)
 104 {
 105         float *dest;
 106
 107         if (b->remaining) /* Non empty buffer, must still be playing */
 108                 return;
 109         if (b->size != size) {
 110                 b->buffer = para_realloc(b->buffer, size * sizeof(float));
 111                 b->size = size;
 112         }
 113         dest = b->buffer;
 114         while (size--)
 115                 *dest++ = (*source++) / 32768.0;
 116         b->ptr = b->buffer;
 117         b->remaining = b->size;
 118 }
 119
 120 static OSStatus osx_callback(void * inClientData,
 121         __a_unused AudioUnitRenderActionFlags *inActionFlags,
 122         __a_unused const AudioTimeStamp *inTimeStamp,
 123         __a_unused  UInt32 inBusNumber,
 124         __a_unused UInt32 inNumFrames,
 125         AudioBufferList *outOutputData)
 126 {
 127         long m, n;
 128         float *dest;
 129         int i;
 130         struct private_osx_write_data *powd = inClientData;
 131
 132 //      PARA_INFO_LOG("%p\n", powd);
 133         for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
 134                 /* what we have to fill */
 135                 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
 136                 dest = outOutputData->mBuffers[i].mData;
 137                 while (m > 0) {
 138                         if ((n = powd->from->remaining) <= 0) {
 139                                 PARA_INFO_LOG("%s", "buffer underrun\n");
 140                                 return 0;
 141                         }
 142 //                      PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
 143                         /*
 144                          * we dump what we can. In fact, just the necessary
 145                          * should be sufficient
 146                          */
 147                         if (n > m)
 148                                 n = m;
 149                         memcpy(dest, powd->from->ptr, n * sizeof(float));
 150                         dest += n;
 151                         /* remember all done work */
 152                         m -= n;
 153                         powd->from->ptr += n;
 154                         if ((powd->from->remaining -= n) <= 0)
 155                                 powd->from = powd->from->next;
 156                 }
 157         }
 158         return 0;
 159 }
 160
 161 static int osx_write_open(struct writer_node *wn)
 162 {
 163         struct private_osx_write_data *powd = para_calloc(
 164                 sizeof(struct private_osx_write_data));
 165         ComponentDescription desc;
 166         Component comp;
 167         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 168         AudioStreamBasicDescription format;
 169         int ret;
 170         struct writer_node_group *wng = wn->wng;
 171         struct osx_write_args_info *conf = wn->conf;
 172
 173         wn->private_data = powd;
 174         /* where did that default audio output go? */
 175         desc.componentType = kAudioUnitType_Output;
 176         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 177         /* NOTE: and if default output isn't Apple? */
 178         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 179         desc.componentFlags = 0;
 180         desc.componentFlagsMask = 0;
 181         ret = -E_DEFAULT_COMP;
 182         comp = FindNextComponent(NULL, &desc);
 183         if (!comp)
 184                 goto e0;
 185         ret = -E_OPEN_COMP;
 186         if (OpenAComponent(comp, &powd->audio_unit))
 187                 goto e0;
 188         ret = -E_UNIT_INIT;
 189         if (AudioUnitInitialize(powd->audio_unit))
 190                 goto e1;
 191         powd->play = 0;
 192         /* Hmmm, let's choose PCM format */
 193         /* We tell the Output Unit what format we're going to supply data to it.
 194          * This is necessary if you're providing data through an input callback
 195          * AND you want the DefaultOutputUnit to do any format conversions
 196          * necessary from your format to the device's format.
 197          */
 198         if (!conf->samplerate_given && wng->samplerate)
 199                 powd->samplerate = *wng->samplerate;
 200         else
 201                 powd->samplerate = conf->samplerate_arg;
 202         format.mSampleRate = powd->samplerate;
 203         /* The specific encoding type of audio stream*/
 204         format.mFormatID = kAudioFormatLinearPCM;
 205         /* flags specific to each format */
 206         format.mFormatFlags = kLinearPCMFormatFlagIsFloat
 207                 | kLinearPCMFormatFlagIsPacked
 208                 | kLinearPCMFormatFlagIsBigEndian;
 209         if (!conf->channels_given && wng->channels)
 210                 powd->channels = *wng->channels;
 211         else
 212                 powd->channels = conf->channels_arg;
 213         format.mChannelsPerFrame = powd->channels;
 214         format.mFramesPerPacket = 1;
 215         format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
 216         format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
 217         /* one of the most constant constants of the whole computer history */
 218         format.mBitsPerChannel = sizeof(float) * 8;
 219         ret = -E_STREAM_FORMAT;
 220         if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_StreamFormat,
 221                         kAudioUnitScope_Input, 0, &format,
 222                         sizeof(AudioStreamBasicDescription)))
 223                 goto e2;
 224         init_buffers(wn);
 225         ret = -E_ADD_CALLBACK;
 226         if (AudioUnitSetProperty(powd->audio_unit, kAudioUnitProperty_SetRenderCallback,
 227                         kAudioUnitScope_Input, 0, &inputCallback,
 228                         sizeof(inputCallback)) < 0)
 229                 goto e3;
 230         return 1;
 231 e3:
 232         destroy_buffers(powd);
 233 e2:
 234         AudioUnitUninitialize(powd->audio_unit);
 235 e1:
 236         CloseComponent(powd->audio_unit);
 237 e0:
 238         return ret;
 239 }
 240
 241 __malloc static void *osx_write_parse_config(const char *options)
 242 {
 243         struct osx_write_args_info *conf
 244                 = para_calloc(sizeof(struct osx_write_args_info));
 245         PARA_INFO_LOG("options: %s\n", options);
 246         int ret = osx_cmdline_parser_string(options, conf, "osx_write");
 247         if (ret)
 248                 goto err_out;
 249         return conf;
 250 err_out:
 251         free(conf);
 252         return NULL;
 253
 254 }
 255
 256 static void osx_write_close(struct writer_node *wn)
 257 {
 258         struct private_osx_write_data *powd = wn->private_data;
 259
 260         PARA_INFO_LOG("closing writer node %p\n", wn);
 261         AudioOutputUnitStop(powd->audio_unit);
 262         AudioUnitUninitialize(powd->audio_unit);
 263         CloseComponent(powd->audio_unit);
 264         destroy_buffers(powd);
 265         free(powd);
 266 }
 267
 268 static int need_new_buffer(struct writer_node *wn)
 269 {
 270         struct writer_node_group *wng = wn->wng;
 271         struct private_osx_write_data *powd = wn->private_data;
 272
 273         if (*wng->loaded < sizeof(short))
 274                 return 0;
 275         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 276                 return 0;
 277         return 1;
 278 }
 279
 280 static int osx_write_post_select(__a_unused struct sched *s,
 281                 struct writer_node *wn)
 282 {
 283         struct private_osx_write_data *powd = wn->private_data;
 284         struct writer_node_group *wng = wn->wng;
 285         short *data = (short*)wng->buf;
 286
 287         if (!need_new_buffer(wn))
 288                 return 1;
 289         fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
 290         powd->to = powd->to->next;
 291         wn->written = *wng->loaded;
 292         if (!powd->play) {
 293                 if (AudioOutputUnitStart(powd->audio_unit))
 294                         return -E_UNIT_START;
 295                 powd->play = 1;
 296         }
 297         return 1;
 298 }
 299
 300 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 301 {
 302         struct private_osx_write_data *powd = wn->private_data;
 303         struct writer_node_group *wng = wn->wng;
 304         size_t numbytes = powd->to->remaining * sizeof(short);
 305         struct timeval tmp = {.tv_sec = 1, .tv_usec = 0}, delay = tmp;
 306         unsigned long divisor;
 307
 308         if (!numbytes && *wng->loaded >= sizeof(short))
 309                 goto min_delay; /* there's a buffer to fill */
 310         if (!numbytes)
 311                 return 1;
 312         divisor = powd->samplerate * powd->channels * 2 / numbytes;
 313         if (divisor)
 314                 tv_divide(divisor, &tmp, &delay);
 315         if (tv_diff(&s->timeout, &delay, NULL) > 0)
 316                 s->timeout = delay;
 317 //      PARA_DEBUG_LOG("delay: %lu:%lu\n", (long unsigned) s->timeout.tv_sec,
 318 //              (long unsigned) s->timeout.tv_usec);
 319         return 1;
 320 min_delay:
 321         PARA_DEBUG_LOG("%s\n", "minimal delay");
 322         s->timeout.tv_sec = 0;
 323         s->timeout.tv_usec = 1;
 324         return 1;
 325 }
 326
 327 /** the init function of the osx writer */
 328 void osx_write_init(struct writer *w)
 329 {
 330         w->open = osx_write_open;
 331         w->close = osx_write_close;
 332         w->pre_select = osx_write_pre_select;
 333         w->post_select = osx_write_post_select;
 334         w->parse_config = osx_write_parse_config;
 335         w->shutdown = NULL; /* nothing to do */
 336 }