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/*************************************************************************
VirtualAudioFile.cpp - adapter between QIODevice and libaudiofile
-------------------
begin : Mon May 06 2002
copyright : (C) 2002 by Thomas Eschenbacher
email : Thomas.Eschenbacher@gmx.de
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#include "config.h"
#include <stdlib.h> // for calloc()
#include <unistd.h>
#include <QIODevice>
#include "libkwave/VirtualAudioFile.h"
/**
* map for finding the corresponding VirtualAudioFile
* adapter to a AFvirtualfile from libaudiofile
*/
static QMap<AFvirtualfile*,VirtualAudioFile*> *_adapter_map = 0;
/** Last error number from libaudiofile. -1 if no error occurred */
static long _last_audiofile_error = -1;
/** Last error text from libaudiofile, empty if no error occurred */
static QString _last_audiofile_error_text;
//***************************************************************************
/**
* Error handler for libaudiofile
* @warning NOT THREADSAFE!
* @param error the numeric error code, >=0, defined in audiofile.h,
* something starting with AF_BAD_...
* @param str text, not localized, so not usable for us :-(
*/
static void _handle_audiofile_error(long int error, const char *str)
{
qDebug("libaudiofile error %ld: '%s'", error, str);
_last_audiofile_error = error;
_last_audiofile_error_text = QString::fromAscii(str);
}
//***************************************************************************
/** Returns the last libaudiofile error and resets it to -1 */
static long _lastAudiofileError()
{
long err = _last_audiofile_error;
_last_audiofile_error = -1;
// ignore "bad alloc", which might occur on a "malloc(0)"
if (err == AF_BAD_MALLOC) err = -1;
return err;
}
//***************************************************************************
static ssize_t af_file_read(AFvirtualfile *vfile, void *data,
size_t nbytes)
{
VirtualAudioFile *adapter = VirtualAudioFile::adapter(vfile);
return (adapter) ?
static_cast<ssize_t>(adapter->read(
static_cast<char *>(data),
static_cast<unsigned int>(nbytes)
)) : 0;
}
//***************************************************************************
static AFfileoffset af_file_length(AFvirtualfile *vfile)
{
VirtualAudioFile *adapter = VirtualAudioFile::adapter(vfile);
return (adapter) ? static_cast<AFfileoffset>(adapter->length()) : -1;
}
//***************************************************************************
static ssize_t af_file_write(AFvirtualfile *vfile, const void *data,
size_t nbytes)
{
VirtualAudioFile *adapter = VirtualAudioFile::adapter(vfile);
return (adapter) ?
static_cast<ssize_t>(adapter->write(
static_cast<const char *>(data),
static_cast<unsigned int>(nbytes)
)) : 0;
}
//***************************************************************************
static void af_file_destroy(AFvirtualfile */*vfile*/)
{
}
//***************************************************************************
static AFfileoffset af_file_seek(AFvirtualfile *vfile, AFfileoffset offset,
int is_relative)
{
VirtualAudioFile *adapter = VirtualAudioFile::adapter(vfile);
return (adapter) ?
static_cast<AFfileoffset>(adapter->seek(
static_cast<qint64>(offset),
(is_relative != 0)
)) : -1;
}
//***************************************************************************
static AFfileoffset af_file_tell(AFvirtualfile *vfile)
{
VirtualAudioFile *adapter = VirtualAudioFile::adapter(vfile);
return (adapter) ? static_cast<AFfileoffset>(adapter->tell()) : -1;
}
//***************************************************************************
/**
* Replacement of af_virtual_file_new from original libaudiofile code.
* Unfortunately the original is not usable because it is not available
* through the shared library API of some libaudiofile versions.
*
* original version: see libaudiofile/af_vfs.c (GPL 2+)
* original author: Copyright (C) 1999, Elliot Lee <sopwith@redhat.com>
*/
static AFvirtualfile *__af_virtual_file_new(void)
{
return static_cast<AFvirtualfile *>(calloc(sizeof(AFvirtualfile), 1));
}
//***************************************************************************
//***************************************************************************
VirtualAudioFile::VirtualAudioFile(QIODevice &device)
:m_device(device), m_file_handle(0), m_virtual_file(0),
m_last_error(-1), m_last_error_text()
{
// create the virtual file structure for libaudiofile
m_virtual_file = __af_virtual_file_new();
Q_ASSERT(m_virtual_file);
if (!m_virtual_file) return;
// enter our wrapper functions
m_virtual_file->closure = 0;
m_virtual_file->read = af_file_read;
m_virtual_file->write = af_file_write;
m_virtual_file->length = af_file_length;
m_virtual_file->destroy = af_file_destroy;
m_virtual_file->seek = af_file_seek;
m_virtual_file->tell = af_file_tell;
}
//***************************************************************************
void VirtualAudioFile::open(VirtualAudioFile *x, AFfilesetup setup)
{
// register ourself
adapter(0); // dummy lookup, for creating a new map if needed
Q_ASSERT(_adapter_map);
if (_adapter_map) _adapter_map->insert(m_virtual_file, x);
// determine the mode: rw/w/r
const char *mode = 0;
if (m_device.isWritable()) mode = "w";
else if (m_device.isReadable()) mode = "r";
Q_ASSERT(mode);
AFerrfunc old_handler;
old_handler = afSetErrorHandler(_handle_audiofile_error);
// open the virtual file and get a handle for it
m_file_handle = afOpenVirtualFile(m_virtual_file, mode, setup);
m_last_error = _lastAudiofileError();
m_last_error_text = _last_audiofile_error_text;
afSetErrorHandler(old_handler);
}
//***************************************************************************
void VirtualAudioFile::close()
{
// close libaudiofile stuff
afCloseFile(m_file_handle);
// de-register ourself
if (_adapter_map) _adapter_map->remove(m_virtual_file);
m_virtual_file = 0;
m_file_handle = 0;
}
//***************************************************************************
VirtualAudioFile::~VirtualAudioFile()
{
if (m_virtual_file) close();
}
//***************************************************************************
unsigned int VirtualAudioFile::read(char *data, unsigned int nbytes)
{
Q_ASSERT(data);
if (!data) return 0;
return m_device.read(data, nbytes);
}
//***************************************************************************
qint64 VirtualAudioFile::length()
{
return m_device.size();
}
//***************************************************************************
unsigned int VirtualAudioFile::write(const char *data, unsigned int nbytes)
{
Q_ASSERT(data);
if (!data) return 0;
return m_device.write(data, nbytes);
}
//***************************************************************************
void VirtualAudioFile::destroy()
{
}
//***************************************************************************
qint64 VirtualAudioFile::seek(qint64 offset, bool is_relative)
{
bool ok = (is_relative) ?
m_device.seek(m_device.pos() + offset) : m_device.seek(offset);
return (ok) ? m_device.pos() : -1;
}
//***************************************************************************
qint64 VirtualAudioFile::tell()
{
return m_device.pos();
}
//***************************************************************************
VirtualAudioFile *VirtualAudioFile::adapter(AFvirtualfile *vfile)
{
// create a new empty map if necessary
if (!_adapter_map) _adapter_map =
new QMap<AFvirtualfile*,VirtualAudioFile*>();
Q_ASSERT(_adapter_map);
if (!_adapter_map) return 0;
// lookup in the map
return _adapter_map->contains(vfile) ? (*_adapter_map)[vfile] : 0;
}
//***************************************************************************
//***************************************************************************