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                 b->buffer = para_realloc(b->buffer, size * sizeof(float));
 109                 b->size = size;
 110         }
 111         dest = b->buffer;
 112         while (size--) {
 113                 char *tmp = (char *)source;
 114                 char c = *tmp;
 115                 *tmp = *(tmp + 1);
 116                 *(tmp + 1) = c;
 117                 /* *dest++ = ((*source++) + 32768) / 65536.0; */
 118                 *dest++ = (*source++) / 32768.0;
 119         }
 120         b->ptr = b->buffer;
 121         b->remaining = b->size;
 122 }
 123
 124 static OSStatus osx_callback(void * inClientData,
 125         __a_unused AudioUnitRenderActionFlags *inActionFlags,
 126         __a_unused const AudioTimeStamp *inTimeStamp,
 127         __a_unused  UInt32 inBusNumber,
 128         __a_unused UInt32 inNumFrames,
 129         AudioBufferList *outOutputData)
 130 {
 131         long m, n;
 132         float *dest;
 133         int i;
 134         struct private_osx_write_data *powd = inClientData;
 135
 136 //      PARA_INFO_LOG("%p\n", powd);
 137         for (i = 0; i < outOutputData->mNumberBuffers; ++i) {
 138                 /* what we have to fill */
 139                 m = outOutputData->mBuffers[i].mDataByteSize / sizeof(float);
 140                 dest = outOutputData->mBuffers[i].mData;
 141                 while (m > 0) {
 142                         if ((n = powd->from->remaining) <= 0) {
 143                                 PARA_INFO_LOG("%s", "buffer underrun\n");
 144                                 /* no more bytes in the current read buffer! */
 145                                 while ((n = powd->from->remaining) <= 0)
 146                                         /* wait for the results */
 147                                         usleep(2000);
 148                         }
 149                         PARA_INFO_LOG("buf %p: n = %ld, m= %ld\n", powd->from->buffer, n, m);
 150                         /*
 151                          * we dump what we can. In fact, just the necessary
 152                          * should be sufficient
 153                          */
 154                         if (n > m)
 155                                 n = m;
 156                         memcpy(dest, powd->from->ptr, n * sizeof(float));
 157                         dest += n;
 158                         /* remember all done work */
 159                         m -= n;
 160                         powd->from->ptr += n;
 161                         if ((powd->from->remaining -= n) <= 0)
 162                                 powd->from = powd->from->next;
 163                 }
 164         }
 165         return 0;
 166 }
 167
 168 static int osx_write_open(struct writer_node *wn)
 169 {
 170         struct private_osx_write_data *powd = para_calloc(
 171                 sizeof(struct private_osx_write_data));
 172         ComponentDescription desc;
 173         Component comp;
 174         AURenderCallbackStruct inputCallback = {osx_callback, powd};
 175         AudioStreamBasicDescription format;
 176         int ret;
 177         struct writer_node_group *wng = wn->wng;
 178         struct osx_write_args_info *conf = wn->conf;
 179
 180         wn->private_data = powd;
 181         /* where did that default audio output go? */
 182         desc.componentType = kAudioUnitType_Output;
 183         desc.componentSubType = kAudioUnitSubType_DefaultOutput;
 184         /* NOTE: and if default output isn't Apple? */
 185         desc.componentManufacturer = kAudioUnitManufacturer_Apple;
 186         desc.componentFlags = 0;
 187         desc.componentFlagsMask = 0;
 188         ret = -E_DEFAULT_COMP;
 189         comp = FindNextComponent(NULL, &desc);
 190         if (!comp)
 191                 goto e0;
 192         ret = -E_OPEN_COMP;
 193         if (OpenAComponent(comp, &powd->output))
 194                 goto e0;
 195         ret = -E_UNIT_INIT;
 196         if (AudioUnitInitialize(powd->output))
 197                 goto e1;
 198         powd->size = 0;
 199         powd->ptr = NULL;
 200         powd->play = 0;
 201         /* Hmmm, let's choose PCM format */
 202         /* We tell the Output Unit what format we're going to supply data to it.
 203          * This is necessary if you're providing data through an input callback
 204          * AND you want the DefaultOutputUnit to do any format conversions
 205          * necessary from your format to the device's format.
 206          */
 207         if (!conf->samplerate_given && wng->samplerate)
 208                 powd->samplerate = *wng->samplerate;
 209         else
 210                 powd->samplerate = conf->samplerate_arg;
 211         format.mSampleRate = powd->samplerate;
 212         /* The specific encoding type of audio stream*/
 213         format.mFormatID = kAudioFormatLinearPCM;
 214         /* flags specific to each format */
 215         format.mFormatFlags = kLinearPCMFormatFlagIsFloat
 216                 | kLinearPCMFormatFlagIsPacked
 217                 | kLinearPCMFormatFlagIsBigEndian;
 218         if (!conf->channels_given && wng->channels)
 219                 powd->channels = *wng->channels;
 220         else
 221                 powd->channels = conf->channels_arg;
 222         format.mChannelsPerFrame = powd->channels;
 223         format.mFramesPerPacket = 1;
 224         format.mBytesPerPacket = format.mChannelsPerFrame * sizeof(float);
 225         format.mBytesPerFrame = format.mFramesPerPacket * format.mBytesPerPacket;
 226         /* one of the most constant constants of the whole computer history */
 227         format.mBitsPerChannel = sizeof(float) * 8;
 228         ret = -E_STREAM_FORMAT;
 229         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_StreamFormat,
 230                         kAudioUnitScope_Input, 0, &format,
 231                         sizeof(AudioStreamBasicDescription)))
 232                 goto e2;
 233         init_buffers(powd);
 234         ret = -E_ADD_CALLBACK;
 235         if (AudioUnitSetProperty(powd->output, kAudioUnitProperty_SetRenderCallback,
 236                         kAudioUnitScope_Input, 0, &inputCallback,
 237                         sizeof(inputCallback)) < 0)
 238                 goto e3;
 239         return 1;
 240 e3:
 241         destroy_buffers(powd);
 242 e2:
 243         AudioUnitUninitialize(powd->output);
 244 e1:
 245         CloseComponent(powd->output);
 246 e0:
 247         return ret;
 248 }
 249
 250 __malloc void *osx_write_parse_config(char *options)
 251 {
 252         struct osx_write_args_info *conf
 253                 = para_calloc(sizeof(struct osx_write_args_info));
 254         PARA_INFO_LOG("options: %s\n", options);
 255         int ret = osx_cmdline_parser_string(options, conf, "osx_write");
 256         if (ret)
 257                 goto err_out;
 258         return conf;
 259 err_out:
 260         free(conf);
 261         return NULL;
 262
 263 }
 264
 265 static void osx_write_close(struct writer_node *wn)
 266 {
 267         struct private_osx_write_data *powd = wn->private_data;
 268
 269         PARA_INFO_LOG("closing writer node %p\n", wn);
 270         AudioOutputUnitStop(powd->output);
 271         AudioUnitUninitialize(powd->output);
 272         CloseComponent(powd->output);
 273         destroy_buffers(powd);
 274         free(powd);
 275 }
 276
 277 static int need_new_buffer(struct writer_node *wn)
 278 {
 279         struct writer_node_group *wng = wn->wng;
 280         struct private_osx_write_data *powd = wn->private_data;
 281
 282         if (*wng->loaded < sizeof(short))
 283                 return 0;
 284         if (powd->to->remaining) /* Non empty buffer, must still be playing */
 285                 return 0;
 286         return 1;
 287 }
 288
 289 static int osx_write_post_select(__a_unused struct sched *s,
 290                 struct writer_node *wn)
 291 {
 292         struct private_osx_write_data *powd = wn->private_data;
 293         struct writer_node_group *wng = wn->wng;
 294         short *data = (short*)wng->buf;
 295
 296         if (!need_new_buffer(wn))
 297                 return 1;
 298         fill_buffer(powd->to, data, *wng->loaded / sizeof(short));
 299         powd->to = powd->to->next;
 300         wn->written = *wng->loaded;
 301         if (!powd->play) {
 302                 if (AudioOutputUnitStart(powd->output))
 303                         return -E_UNIT_START;
 304                 powd->play = 1;
 305         }
 306         return 1;
 307 }
 308
 309 static int osx_write_pre_select(struct sched *s, __a_unused struct writer_node *wn)
 310 {
 311         s->timeout.tv_sec = 0;
 312         s->timeout.tv_usec = 20;
 313         return 1;
 314 }
 315
 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 }