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 3 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,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU 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, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file clients/playrtp-coreaudio.c
  19  * @brief RTP player - Core Audio support
  20  */
  21
  22 #include "common.h"
  23
  24 #if HAVE_COREAUDIO_AUDIOHARDWARE_H
  25 #include <pthread.h>
  26
  27 #include "mem.h"
  28 #include "log.h"
  29 #include "vector.h"
  30 #include "heap.h"
  31 #include "playrtp.h"
  32 #include "coreaudio.h"
  33
  34 /** @brief Callback from Core Audio */
  35 static OSStatus adioproc
  36     (AudioDeviceID attribute((unused)) inDevice,
  37      const AudioTimeStamp attribute((unused)) *inNow,
  38      const AudioBufferList attribute((unused)) *inInputData,
  39      const AudioTimeStamp attribute((unused)) *inInputTime,
  40      AudioBufferList *outOutputData,
  41      const AudioTimeStamp attribute((unused)) *inOutputTime,
  42      void attribute((unused)) *inClientData) {
  43   UInt32 nbuffers = outOutputData->mNumberBuffers;
  44   AudioBuffer *ab = outOutputData->mBuffers;
  45   uint32_t samples_available;
  46
  47   pthread_mutex_lock(&lock);
  48   while(nbuffers > 0) {
  49     float *samplesOut = ab->mData;
  50     size_t samplesOutLeft = ab->mDataByteSize / sizeof (float);
  51
  52     while(samplesOutLeft > 0) {
  53       const struct packet *p = playrtp_next_packet();
  54       if(p && contains(p, next_timestamp)) {
  55         /* This packet is ready to play */
  56         const uint32_t packet_end = p->timestamp + p->nsamples;
  57         const uint32_t offset = next_timestamp - p->timestamp;
  58         const uint16_t *ptr = (void *)(p->samples_raw + offset);
  59
  60         samples_available = packet_end - next_timestamp;
  61         if(samples_available > samplesOutLeft)
  62           samples_available = samplesOutLeft;
  63         next_timestamp += samples_available;
  64         samplesOutLeft -= samples_available;
  65         if(dump_buffer) {
  66           size_t n;
  67
  68           for(n = 0; n < samples_available; ++n) {
  69             dump_buffer[dump_index++] = (int16_t)ntohs(ptr[n]);
  70             dump_index %= dump_size;
  71           }
  72         }
  73         while(samples_available-- > 0)
  74           *samplesOut++ = (int16_t)ntohs(*ptr++) * (0.5 / 32767);
  75         /* We don't bother junking the packet - that'll be dealt with next time
  76          * round */
  77       } else {
  78         /* No packet is ready to play (and there might be no packet at all) */
  79         samples_available = p ? p->timestamp - next_timestamp
  80                               : samplesOutLeft;
  81         if(samples_available > samplesOutLeft)
  82           samples_available = samplesOutLeft;
  83         //info("infill by %"PRIu32, samples_available);
  84         /* Conveniently the buffer is 0 to start with */
  85         next_timestamp += samples_available;
  86         samplesOut += samples_available;
  87         samplesOutLeft -= samples_available;
  88         if(dump_buffer) {
  89           size_t n;
  90
  91           for(n = 0; n < samples_available; ++n) {
  92             dump_buffer[dump_index++] = 0;
  93             dump_index %= dump_size;
  94           }
  95         }
  96       }
  97     }
  98     ++ab;
  99     --nbuffers;
 100   }
 101   pthread_mutex_unlock(&lock);
 102   return 0;
 103 }
 104
 105 void playrtp_coreaudio(void) {
 106   OSStatus status;
 107   UInt32 propertySize;
 108   AudioDeviceID adid;
 109   AudioStreamBasicDescription asbd;
 110
 111   /* If this looks suspiciously like libao's macosx driver there's an
 112    * excellent reason for that... */
 113
 114   /* TODO report errors as strings not numbers */
 115   /* Identify the device to use */
 116   adid = coreaudio_getdevice(device);
 117   propertySize = sizeof asbd;
 118   status = AudioDeviceGetProperty(adid, 0, false,
 119                                   kAudioDevicePropertyStreamFormat,
 120                                   &propertySize, &asbd);
 121   if(status)
 122     fatal(0, "AudioHardwareGetProperty: %d", (int)status);
 123   D(("mSampleRate       %f", asbd.mSampleRate));
 124   D(("mFormatID         %08lx", asbd.mFormatID));
 125   D(("mFormatFlags      %08lx", asbd.mFormatFlags));
 126   D(("mBytesPerPacket   %08lx", asbd.mBytesPerPacket));
 127   D(("mFramesPerPacket  %08lx", asbd.mFramesPerPacket));
 128   D(("mBytesPerFrame    %08lx", asbd.mBytesPerFrame));
 129   D(("mChannelsPerFrame %08lx", asbd.mChannelsPerFrame));
 130   D(("mBitsPerChannel   %08lx", asbd.mBitsPerChannel));
 131   D(("mReserved         %08lx", asbd.mReserved));
 132   if(asbd.mFormatID != kAudioFormatLinearPCM)
 133     fatal(0, "audio device does not support kAudioFormatLinearPCM");
 134   status = AudioDeviceAddIOProc(adid, adioproc, 0);
 135   if(status)
 136     fatal(0, "AudioDeviceAddIOProc: %d", (int)status);
 137   pthread_mutex_lock(&lock);
 138   for(;;) {
 139     /* Wait for the buffer to fill up a bit */
 140     playrtp_fill_buffer();
 141     /* Start playing now */
 142     info("Playing...");
 143     next_timestamp = pheap_first(&packets)->timestamp;
 144     active = 1;
 145     status = AudioDeviceStart(adid, adioproc);
 146     if(status)
 147       fatal(0, "AudioDeviceStart: %d", (int)status);
 148     /* Wait until the buffer empties out */
 149     while(nsamples >= minbuffer
 150           || (nsamples > 0
 151               && contains(pheap_first(&packets), next_timestamp)))
 152       pthread_cond_wait(&cond, &lock);
 153     /* Stop playing for a bit until the buffer re-fills */
 154     status = AudioDeviceStop(adid, adioproc);
 155     if(status)
 156       fatal(0, "AudioDeviceStop: %d", (int)status);
 157     active = 0;
 158     /* Go back round */
 159   }
 160 }
 161
 162 #endif
 163
 164 /*
 165 Local Variables:
 166 c-basic-offset:2
 167 comment-column:40
 168 fill-column:79
 169 indent-tabs-mode:nil
 170 End:
 171 */