mdw@git.distorted.org.uk Git - disorder/blob - clients/playrtp-coreaudio.c

   1 /*
   2  * This file is part of DisOrder.
   3  * Copyright (C) 2007 Richard Kettlewell
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  18  * USA
  19  */
  20 /** @file clients/playrtp-coreaudio.c
  21  * @brief RTP player - Core Audio support
  22  */
  23
  24 #include <config.h>
  25
  26 #if HAVE_COREAUDIO_AUDIOHARDWARE_H
  27 #include "types.h"
  28
  29 #include <assert.h>
  30 #include <pthread.h>
  31 #include <CoreAudio/AudioHardware.h>
  32
  33 #include "mem.h"
  34 #include "log.h"
  35 #include "vector.h"
  36 #include "heap.h"
  37 #include "playrtp.h"
  38
  39 /** @brief Callback from Core Audio */
  40 static OSStatus adioproc
  41     (AudioDeviceID attribute((unused)) inDevice,
  42      const AudioTimeStamp attribute((unused)) *inNow,
  43      const AudioBufferList attribute((unused)) *inInputData,
  44      const AudioTimeStamp attribute((unused)) *inInputTime,
  45      AudioBufferList *outOutputData,
  46      const AudioTimeStamp attribute((unused)) *inOutputTime,
  47      void attribute((unused)) *inClientData) {
  48   UInt32 nbuffers = outOutputData->mNumberBuffers;
  49   AudioBuffer *ab = outOutputData->mBuffers;
  50   uint32_t samples_available;
  51
  52   pthread_mutex_lock(&lock);
  53   while(nbuffers > 0) {
  54     float *samplesOut = ab->mData;
  55     size_t samplesOutLeft = ab->mDataByteSize / sizeof (float);
  56
  57     while(samplesOutLeft > 0) {
  58       const struct packet *p = playrtp_next_packet();
  59       if(p && contains(p, next_timestamp)) {
  60         /* This packet is ready to play */
  61         const uint32_t packet_end = p->timestamp + p->nsamples;
  62         const uint32_t offset = next_timestamp - p->timestamp;
  63         const uint16_t *ptr = (void *)(p->samples_raw + offset);
  64
  65         samples_available = packet_end - next_timestamp;
  66         if(samples_available > samplesOutLeft)
  67           samples_available = samplesOutLeft;
  68         next_timestamp += samples_available;
  69         samplesOutLeft -= samples_available;
  70         while(samples_available-- > 0)
  71           *samplesOut++ = (int16_t)ntohs(*ptr++) * (0.5 / 32767);
  72         /* We don't bother junking the packet - that'll be dealt with next time
  73          * round */
  74       } else {
  75         /* No packet is ready to play (and there might be no packet at all) */
  76         samples_available = p ? p->timestamp - next_timestamp
  77                               : samplesOutLeft;
  78         if(samples_available > samplesOutLeft)
  79           samples_available = samplesOutLeft;
  80         //info("infill by %"PRIu32, samples_available);
  81         /* Conveniently the buffer is 0 to start with */
  82         next_timestamp += samples_available;
  83         samplesOut += samples_available;
  84         samplesOutLeft -= samples_available;
  85       }
  86     }
  87     ++ab;
  88     --nbuffers;
  89   }
  90   pthread_mutex_unlock(&lock);
  91   return 0;
  92 }
  93
  94 void playrtp_coreaudio(void) {
  95   OSStatus status;
  96   UInt32 propertySize;
  97   AudioDeviceID adid;
  98   AudioStreamBasicDescription asbd;
  99
 100   /* If this looks suspiciously like libao's macosx driver there's an
 101    * excellent reason for that... */
 102
 103   /* TODO report errors as strings not numbers */
 104   propertySize = sizeof adid;
 105   status = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice,
 106                                     &propertySize, &adid);
 107   if(status)
 108     fatal(0, "AudioHardwareGetProperty: %d", (int)status);
 109   if(adid == kAudioDeviceUnknown)
 110     fatal(0, "no output device");
 111   propertySize = sizeof asbd;
 112   status = AudioDeviceGetProperty(adid, 0, false,
 113                                   kAudioDevicePropertyStreamFormat,
 114                                   &propertySize, &asbd);
 115   if(status)
 116     fatal(0, "AudioHardwareGetProperty: %d", (int)status);
 117   D(("mSampleRate       %f", asbd.mSampleRate));
 118   D(("mFormatID         %08lx", asbd.mFormatID));
 119   D(("mFormatFlags      %08lx", asbd.mFormatFlags));
 120   D(("mBytesPerPacket   %08lx", asbd.mBytesPerPacket));
 121   D(("mFramesPerPacket  %08lx", asbd.mFramesPerPacket));
 122   D(("mBytesPerFrame    %08lx", asbd.mBytesPerFrame));
 123   D(("mChannelsPerFrame %08lx", asbd.mChannelsPerFrame));
 124   D(("mBitsPerChannel   %08lx", asbd.mBitsPerChannel));
 125   D(("mReserved         %08lx", asbd.mReserved));
 126   if(asbd.mFormatID != kAudioFormatLinearPCM)
 127     fatal(0, "audio device does not support kAudioFormatLinearPCM");
 128   status = AudioDeviceAddIOProc(adid, adioproc, 0);
 129   if(status)
 130     fatal(0, "AudioDeviceAddIOProc: %d", (int)status);
 131   pthread_mutex_lock(&lock);
 132   for(;;) {
 133     /* Wait for the buffer to fill up a bit */
 134     playrtp_fill_buffer();
 135     /* Start playing now */
 136     info("Playing...");
 137     next_timestamp = pheap_first(&packets)->timestamp;
 138     active = 1;
 139     status = AudioDeviceStart(adid, adioproc);
 140     if(status)
 141       fatal(0, "AudioDeviceStart: %d", (int)status);
 142     /* Wait until the buffer empties out */
 143     while(nsamples >= minbuffer
 144           || (nsamples > 0
 145               && contains(pheap_first(&packets), next_timestamp)))
 146       pthread_cond_wait(&cond, &lock);
 147     /* Stop playing for a bit until the buffer re-fills */
 148     status = AudioDeviceStop(adid, adioproc);
 149     if(status)
 150       fatal(0, "AudioDeviceStop: %d", (int)status);
 151     active = 0;
 152     /* Go back round */
 153   }
 154 }
 155
 156 #endif
 157
 158 /*
 159 Local Variables:
 160 c-basic-offset:2
 161 comment-column:40
 162 fill-column:79
 163 indent-tabs-mode:nil
 164 End:
 165 */