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coreaudiosource.cc

/*
    Copyright (C) 2006 Paul Davis
    Written by Taybin Rutkin

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <algorithm>
#define __STDC_FORMAT_MACROS
#include <inttypes.h>

#include <pbd/error.h>
#include <ardour/coreaudiosource.h>
#include <ardour/utils.h>

#include <appleutility/CAAudioFile.h>
#include <appleutility/CAStreamBasicDescription.h>

#include "i18n.h"

#include <AudioToolbox/AudioFormat.h>

using namespace std;
using namespace ARDOUR;
using namespace PBD;

CoreAudioSource::CoreAudioSource (Session& s, const XMLNode& node)
      : AudioFileSource (s, node)
{
      init ();
}

CoreAudioSource::CoreAudioSource (Session& s, const string& path, int chn, Flag flags)
      /* files created this way are never writable or removable */
      : AudioFileSource (s, path, Flag (flags & ~(Writable|Removable|RemovableIfEmpty|RemoveAtDestroy)))
{
      _channel = chn;
      init ();
}

void 
CoreAudioSource::init ()
{
      /* note that we temporarily truncated _id at the colon */
      try {
            af.Open(_path.c_str());

            CAStreamBasicDescription file_format (af.GetFileDataFormat());
            n_channels = file_format.NumberChannels();
            
            if (_channel >= n_channels) {
                  error << string_compose("CoreAudioSource: file only contains %1 channels; %2 is invalid as a channel number (%3)", n_channels, _channel, name()) << endmsg;
                  throw failed_constructor();
            }

            _length = af.GetNumberFrames();

            CAStreamBasicDescription client_format (file_format);

            /* set canonial form (PCM, native float packed, 32 bit, with the correct number of channels
               and interleaved (since we plan to deinterleave ourselves)
            */

            client_format.SetCanonical(client_format.NumberChannels(), true);
            af.SetClientFormat (client_format);

      } catch (CAXException& cax) {
            
            error << string_compose(_("CoreAudioSource: cannot open file \"%1\" for %2"), 
                              _path, (writable() ? "read+write" : "reading")) << endmsg;
            throw failed_constructor ();
      }
}

CoreAudioSource::~CoreAudioSource ()
{
      GoingAway (); /* EMIT SIGNAL */
}

int
CoreAudioSource::safe_read (Sample* dst, nframes_t start, nframes_t cnt, AudioBufferList& abl) const
{
      nframes_t nread = 0;

      while (nread < cnt) {
            
            try {
                  af.Seek (start+nread);
            } catch (CAXException& cax) {
                  error << string_compose("CoreAudioSource: %1 to %2 (%3)", cax.mOperation, start+nread, _name.substr (1)) << endmsg;
                  return -1;
            }
            
            UInt32 new_cnt = cnt - nread;
            
            abl.mBuffers[0].mDataByteSize = new_cnt * n_channels * sizeof(Sample);
            abl.mBuffers[0].mData = dst + nread;
                  
            try {
                  af.Read (new_cnt, &abl);
            } catch (CAXException& cax) {
                  error << string_compose("CoreAudioSource: %1 (%2)", cax.mOperation, _name);
                  return -1;
            }

            if (new_cnt == 0) {
                  /* EOF */
                  if (start+cnt == _length) {
                        /* we really did hit the end */
                        nread = cnt;
                  }
                  break;
            }

            nread += new_cnt;
      }

      if (nread < cnt) {
            return -1;
      } else {
            return 0;
      }
}
      

nframes_t
CoreAudioSource::read_unlocked (Sample *dst, nframes_t start, nframes_t cnt) const
{
      nframes_t file_cnt;
      AudioBufferList abl;

      abl.mNumberBuffers = 1;
      abl.mBuffers[0].mNumberChannels = n_channels;

      if (start > _length) {

            /* read starts beyond end of data, just memset to zero */
            
            file_cnt = 0;

      } else if (start + cnt > _length) {
            
            /* read ends beyond end of data, read some, memset the rest */
            
            file_cnt = _length - start;

      } else {
            
            /* read is entirely within data */

            file_cnt = cnt;
      }

      if (file_cnt != cnt) {
            nframes_t delta = cnt - file_cnt;
            memset (dst+file_cnt, 0, sizeof (Sample) * delta);
      }

      if (file_cnt) {

            if (n_channels == 1) {
                  if (safe_read (dst, start, file_cnt, abl) == 0) {
                        _read_data_count = cnt * sizeof (Sample);
                        return cnt;
                  }
                  return 0;
            }
      }

      Sample* interleave_buf = get_interleave_buffer (file_cnt * n_channels);
      
      if (safe_read (interleave_buf, start, file_cnt, abl) != 0) {
            return 0;
      }

      _read_data_count = cnt * sizeof(float);

      Sample *ptr = interleave_buf + _channel;
      
      /* stride through the interleaved data */
      
      for (uint32_t n = 0; n < file_cnt; ++n) {
            dst[n] = *ptr;
            ptr += n_channels;
      }

      return cnt;
}

float
CoreAudioSource::sample_rate() const
{
      CAStreamBasicDescription client_asbd;

      try {
            client_asbd = af.GetClientDataFormat ();
      } catch (CAXException& cax) {
            error << string_compose("CoreAudioSource: %1 (%2)", cax.mOperation, _name);
            return 0.0;
      }

      return client_asbd.mSampleRate;
}

int
CoreAudioSource::update_header (nframes_t when, struct tm&, time_t)
{
      return 0;
}

int
CoreAudioSource::get_soundfile_info (string path, SoundFileInfo& _info, string& error_msg)
{
      FSRef ref; 
      ExtAudioFileRef af = 0;
      size_t size;
      CFStringRef name;
      int ret = -1;

      if (FSPathMakeRef ((UInt8*)path.c_str(), &ref, 0) != noErr) {
            goto out;
      }
      
      if (ExtAudioFileOpen(&ref, &af) != noErr) {
            goto out;
      }
      
      AudioStreamBasicDescription absd;
      memset(&absd, 0, sizeof(absd));
      size = sizeof(AudioStreamBasicDescription);
      if (ExtAudioFileGetProperty (af, kExtAudioFileProperty_FileDataFormat, &size, &absd) != noErr) {
            goto out;
      }
      
      _info.samplerate = absd.mSampleRate;
      _info.channels   = absd.mChannelsPerFrame;

      size = sizeof(_info.length);
      if (ExtAudioFileGetProperty(af, kExtAudioFileProperty_FileLengthFrames, &size, &_info.length) != noErr) {
            goto out;
      }
      
      size = sizeof(CFStringRef);
      if (AudioFormatGetProperty(kAudioFormatProperty_FormatName, sizeof(absd), &absd, &size, &name) != noErr) {
            goto out;
      }

      _info.format_name = "";

      if (absd.mFormatID == kAudioFormatLinearPCM) {
            if (absd.mFormatFlags & kAudioFormatFlagIsBigEndian) {
                  _info.format_name += "big-endian";
            } else {
                  _info.format_name += "little-endian";
            }
            
            char buf[32];
            snprintf (buf, sizeof (buf), " %" PRIu32 " bit", absd.mBitsPerChannel);
            _info.format_name += buf;
            _info.format_name += '\n';
            
            if (absd.mFormatFlags & kAudioFormatFlagIsFloat) {
                  _info.format_name += "float";
            } else {
                  if (absd.mFormatFlags & kAudioFormatFlagIsSignedInteger) {
                        _info.format_name += "signed";
                  } else {
                        _info.format_name += "unsigned";
                  }
                  /* integer is typical, do not show it */
            }
            
            if (_info.channels > 1) {
                  if (absd.mFormatFlags & kAudioFormatFlagIsNonInterleaved) {
                        _info.format_name += " noninterleaved";
                  }
                  /* interleaved is the normal case, do not show it */
            }
            
            _info.format_name += ' ';
      }

      switch (absd.mFormatID) {
      case kAudioFormatLinearPCM:
            _info.format_name += "PCM";
            break;

      case kAudioFormatAC3:
            _info.format_name += "AC3";
            break;

      case kAudioFormat60958AC3:
            _info.format_name += "60958 AC3";
            break;

      case kAudioFormatMPEGLayer1:
            _info.format_name += "MPEG-1";
            break;

      case kAudioFormatMPEGLayer2:
            _info.format_name += "MPEG-2";
            break;

      case kAudioFormatMPEGLayer3:
            _info.format_name += "MPEG-3";
            break;

      case kAudioFormatAppleIMA4:
            _info.format_name += "IMA-4";
            break;

      case kAudioFormatMPEG4AAC:
            _info.format_name += "AAC";
            break;

      case kAudioFormatMPEG4CELP:
            _info.format_name += "CELP";
            break;

      case kAudioFormatMPEG4HVXC:
            _info.format_name += "HVXC";
            break;

      case kAudioFormatMPEG4TwinVQ:
            _info.format_name += "TwinVQ";
            break;

      /* these really shouldn't show up, but we should do something
         somewhere else to make sure that doesn't happen. until
         that is guaranteed, print something anyway.
      */

      case kAudioFormatTimeCode:
            _info.format_name += "timecode";
            break;

      case kAudioFormatMIDIStream:
            _info.format_name += "MIDI";
            break;

      case kAudioFormatParameterValueStream:
            _info.format_name += "parameter values";
            break;
      }

      // XXX it would be nice to find a way to get this information if it exists

      _info.timecode = 0;
      ret = 0;
      
  out:
      ExtAudioFileDispose (af);
      return ret;
      
}

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