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/*
Audio File Library
Copyright (C) 1998-2000, Michael Pruett <michael@68k.org>
Copyright (C) 2000, Silicon Graphics, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA
*/
/*
data.cpp
*/
#include "config.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "File.h"
#include "FileHandle.h"
#include "Setup.h"
#include "Track.h"
#include "afinternal.h"
#include "audiofile.h"
#include "modules/Module.h"
#include "modules/ModuleState.h"
#include "util.h"
int afWriteFrames (AFfilehandle file, int trackid, const void *samples,
int nvframes2write)
{
SharedPtr<Module> firstmod;
SharedPtr<Chunk> userc;
int bytes_per_vframe;
AFframecount vframe;
if (!_af_filehandle_ok(file))
return -1;
if (!file->checkCanWrite())
return -1;
Track *track = file->getTrack(trackid);
if (!track)
return -1;
if (track->ms->isDirty() && track->ms->setup(file, track) == AF_FAIL)
return -1;
if (!track->ms->fileModuleHandlesSeeking() &&
file->m_seekok &&
file->m_fh->seek(track->fpos_next_frame, File::SeekFromBeginning) !=
track->fpos_next_frame)
{
_af_error(AF_BAD_LSEEK, "unable to position write pointer at next frame");
return -1;
}
bytes_per_vframe = _af_format_frame_size(&track->v, true);
firstmod = track->ms->modules().front();
userc = track->ms->chunks().front();
track->filemodhappy = true;
vframe = 0;
#ifdef UNLIMITED_CHUNK_NVFRAMES
/*
OPTIMIZATION: see the comment at the very end of
arrangemodules() in modules.c for an explanation of this:
*/
if (!trk->ms->mustUseAtomicNVFrames())
{
userc->buffer = (char *) samples;
userc->frameCount = nvframes2write;
firstmod->runPush();
/* Count this chunk if there was no i/o error. */
if (trk->filemodhappy)
vframe += userc->frameCount;
}
else
#else
/* Optimization must be off. */
assert(track->ms->mustUseAtomicNVFrames());
#endif
{
while (vframe < nvframes2write)
{
userc->buffer = (char *) samples + bytes_per_vframe * vframe;
if (vframe <= nvframes2write - _AF_ATOMIC_NVFRAMES)
userc->frameCount = _AF_ATOMIC_NVFRAMES;
else
userc->frameCount = nvframes2write - vframe;
firstmod->runPush();
if (!track->filemodhappy)
break;
vframe += userc->frameCount;
}
}
track->nextvframe += vframe;
track->totalvframes += vframe;
return vframe;
}
int afReadFrames (AFfilehandle file, int trackid, void *samples,
int nvframeswanted)
{
SharedPtr<Module> firstmod;
SharedPtr<Chunk> userc;
AFframecount nvframesleft, nvframes2read;
int bytes_per_vframe;
AFframecount vframe;
if (!_af_filehandle_ok(file))
return -1;
if (!file->checkCanRead())
return -1;
Track *track = file->getTrack(trackid);
if (!track)
return -1;
if (track->ms->isDirty() && track->ms->setup(file, track) == AF_FAIL)
return -1;
if (!track->ms->fileModuleHandlesSeeking() &&
file->m_seekok &&
file->m_fh->seek(track->fpos_next_frame, File::SeekFromBeginning) !=
track->fpos_next_frame)
{
_af_error(AF_BAD_LSEEK, "unable to position read pointer at next frame");
return -1;
}
if (track->totalvframes == -1)
nvframes2read = nvframeswanted;
else
{
nvframesleft = track->totalvframes - track->nextvframe;
nvframes2read = (nvframeswanted > nvframesleft) ?
nvframesleft : nvframeswanted;
}
bytes_per_vframe = _af_format_frame_size(&track->v, true);
firstmod = track->ms->modules().back();
userc = track->ms->chunks().back();
track->filemodhappy = true;
vframe = 0;
if (!track->ms->mustUseAtomicNVFrames())
{
assert(track->frames2ignore == 0);
userc->buffer = samples;
userc->frameCount = nvframes2read;
firstmod->runPull();
if (track->filemodhappy)
vframe += userc->frameCount;
}
else
{
bool eof = false;
if (track->frames2ignore != 0)
{
userc->frameCount = track->frames2ignore;
userc->allocate(track->frames2ignore * bytes_per_vframe);
if (!userc->buffer)
return 0;
firstmod->runPull();
/* Have we hit EOF? */
if (static_cast<ssize_t>(userc->frameCount) < track->frames2ignore)
eof = true;
track->frames2ignore = 0;
userc->deallocate();
}
/*
Now start reading useful frames, until EOF or
premature EOF.
*/
while (track->filemodhappy && !eof && vframe < nvframes2read)
{
AFframecount nvframes2pull;
userc->buffer = (char *) samples + bytes_per_vframe * vframe;
if (vframe <= nvframes2read - _AF_ATOMIC_NVFRAMES)
nvframes2pull = _AF_ATOMIC_NVFRAMES;
else
nvframes2pull = nvframes2read - vframe;
userc->frameCount = nvframes2pull;
firstmod->runPull();
if (track->filemodhappy)
{
vframe += userc->frameCount;
if (static_cast<ssize_t>(userc->frameCount) < nvframes2pull)
eof = true;
}
}
}
track->nextvframe += vframe;
return vframe;
}
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