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/*
Audio File Library
Copyright (C) 2004, Michael Pruett <michael@68k.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307 USA.
*/
/*
iffwrite.c
This file contains routines for writing IFF/8SVX format sound
files.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include "afinternal.h"
#include "audiofile.h"
#include "byteorder.h"
#include "util.h"
#include "setup.h"
#include "iff.h"
status _af_iff_update (AFfilehandle file);
static status WriteVHDR (AFfilehandle file);
static status WriteMiscellaneous (AFfilehandle file);
static status WriteBODY (AFfilehandle file);
static _IFFinfo *iff_info_new (void)
{
_IFFinfo *iff = _af_calloc(1, sizeof (_IFFinfo));
iff->miscellaneousPosition = 0;
iff->VHDR_offset = 0;
iff->BODY_offset = 0;
return iff;
}
status _af_iff_write_init (AFfilesetup setup, AFfilehandle file)
{
u_int32_t fileSize = 0;
if (_af_filesetup_make_handle(setup, file) == AF_FAIL)
return AF_FAIL;
file->formatSpecific = iff_info_new();
af_fwrite("FORM", 4, 1, file->fh);
af_write_uint32_be(&fileSize, file->fh);
af_fwrite("8SVX", 4, 1, file->fh);
WriteVHDR(file);
WriteMiscellaneous(file);
WriteBODY(file);
return AF_SUCCEED;
}
status _af_iff_update (AFfilehandle file)
{
u_int32_t length;
WriteVHDR(file);
WriteMiscellaneous(file);
WriteBODY(file);
/* Get the length of the file. */
length = af_flength(file->fh);
length -= 8;
/* Set the length of the FORM chunk. */
af_fseek(file->fh, 4, SEEK_SET);
af_write_uint32_be(&length, file->fh);
return AF_SUCCEED;
}
static status WriteVHDR (const AFfilehandle file)
{
_Track *track;
_IFFinfo *iff;
u_int32_t chunkSize;
u_int32_t oneShotSamples, repeatSamples, samplesPerRepeat;
u_int16_t sampleRate;
u_int8_t octaves, compression;
u_int32_t volume;
iff = (_IFFinfo *) file->formatSpecific;
/*
If VHDR_offset hasn't been set yet, set it to the
current offset.
*/
if (iff->VHDR_offset == 0)
iff->VHDR_offset = af_ftell(file->fh);
else
af_fseek(file->fh, iff->VHDR_offset, SEEK_SET);
track = _af_filehandle_get_track(file, AF_DEFAULT_TRACK);
af_fwrite("VHDR", 4, 1, file->fh);
chunkSize = 20;
af_write_uint32_be(&chunkSize, file->fh);
/*
IFF/8SVX files have only one audio channel, so the
number of samples is equal to the number of frames.
*/
oneShotSamples = track->totalfframes;
af_write_uint32_be(&oneShotSamples, file->fh);
repeatSamples = 0;
af_write_uint32_be(&repeatSamples, file->fh);
samplesPerRepeat = 0;
af_write_uint32_be(&samplesPerRepeat, file->fh);
sampleRate = track->f.sampleRate;
af_write_uint16_be(&sampleRate, file->fh);
octaves = 0;
compression = 0;
af_fwrite(&octaves, 1, 1, file->fh);
af_fwrite(&compression, 1, 1, file->fh);
/* Volume is in fixed-point notation; 65536 means gain of 1.0. */
volume = 65536;
af_write_uint32_be(&volume, file->fh);
return AF_SUCCEED;
}
static status WriteBODY (AFfilehandle file)
{
_Track *track;
u_int32_t chunkSize;
_IFFinfo *iff = (_IFFinfo *) file->formatSpecific;
track = _af_filehandle_get_track(file, AF_DEFAULT_TRACK);
if (iff->BODY_offset == 0)
iff->BODY_offset = af_ftell(file->fh);
else
af_fseek(file->fh, iff->BODY_offset, SEEK_SET);
af_fwrite("BODY", 4, 1, file->fh);
/*
IFF/8SVX supports only one channel, so the number of
frames is equal to the number of samples, and each
sample is one byte.
*/
chunkSize = track->totalfframes;
af_write_uint32_be(&chunkSize, file->fh);
if (track->fpos_first_frame == 0)
track->fpos_first_frame = af_ftell(file->fh);
/* Add a pad byte to the end of the chunk if the chunk size is odd. */
if ((chunkSize % 2) == 1)
{
u_int8_t zero = 0;
af_fseek(file->fh, iff->BODY_offset + 8 + chunkSize, SEEK_SET);
af_fwrite(&zero, 1, 1, file->fh);
}
return AF_SUCCEED;
}
/*
WriteMiscellaneous writes all the miscellaneous data chunks in a
file handle structure to an IFF/8SVX file.
*/
static status WriteMiscellaneous (AFfilehandle file)
{
_IFFinfo *iff;
int i;
iff = (_IFFinfo *) file->formatSpecific;
if (iff->miscellaneousPosition == 0)
iff->miscellaneousPosition = af_ftell(file->fh);
else
af_fseek(file->fh, iff->miscellaneousPosition, SEEK_SET);
for (i=0; i<file->miscellaneousCount; i++)
{
_Miscellaneous *misc = &file->miscellaneous[i];
u_int32_t chunkType, chunkSize;
u_int8_t padByte = 0;
switch (misc->type)
{
case AF_MISC_NAME:
memcpy(&chunkType, "NAME", 4); break;
case AF_MISC_AUTH:
memcpy(&chunkType, "AUTH", 4); break;
case AF_MISC_COPY:
memcpy(&chunkType, "(c) ", 4); break;
case AF_MISC_ANNO:
memcpy(&chunkType, "ANNO", 4); break;
}
af_fwrite(&chunkType, 4, 1, file->fh);
chunkSize = misc->size;
af_write_uint32_be(&chunkSize, file->fh);
/*
Write the miscellaneous buffer and then a pad byte
if necessary. If the buffer is null, skip the space
for now.
*/
if (misc->buffer != NULL)
af_fwrite(misc->buffer, misc->size, 1, file->fh);
else
af_fseek(file->fh, misc->size, SEEK_CUR);
if (misc->size % 2 != 0)
af_fwrite(&padByte, 1, 1, file->fh);
}
return AF_SUCCEED;
}
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