sm64pc/tools/audiofile-0.3.6/libaudiofile/NIST.cpp

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2020-05-05 12:15:53 +00:00
/*
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 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
*/
/*
NIST.cpp
This file contains code for reading NIST SPHERE files.
*/
#include "config.h"
#include "NIST.h"
#include <assert.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "Setup.h"
#include "Track.h"
#include "File.h"
#include "afinternal.h"
#include "audiofile.h"
#include "byteorder.h"
#include "util.h"
#define NIST_SPHERE_HEADER_LENGTH 1024
#define NIST_SPHERE_MAX_FIELD_LENGTH 80
static const _AFfilesetup nistDefaultFileSetup =
{
_AF_VALID_FILESETUP, /* valid */
AF_FILE_NIST_SPHERE, /* fileFormat */
true, /* trackSet */
true, /* instrumentSet */
true, /* miscellaneousSet */
1, /* trackCount */
NULL, /* tracks */
0, /* instrumentCount */
NULL, /* instruments */
0, /* miscellaneousCount */
NULL /* miscellaneous */
};
bool NISTFile::recognize(File *fh)
{
uint8_t buffer[16];
fh->seek(0, File::SeekFromBeginning);
if (fh->read(buffer, 16) != 16)
return false;
/* Check to see if the file's magic number matches. */
if (memcmp(buffer, "NIST_1A\n 1024\n", 16) == 0)
return true;
return false;
}
AFfilesetup NISTFile::completeSetup(AFfilesetup setup)
{
TrackSetup *track;
if (setup->trackSet && setup->trackCount != 1)
{
_af_error(AF_BAD_NUMTRACKS, "NIST SPHERE file must have 1 track");
return AF_NULL_FILESETUP;
}
track = &setup->tracks[0];
if (track->sampleFormatSet)
{
/* XXXmpruett: Currently we allow only 1-16 bit sample width. */
if (track->f.sampleFormat == AF_SAMPFMT_TWOSCOMP &&
(track->f.sampleWidth < 1 || track->f.sampleWidth > 16))
{
_af_error(AF_BAD_WIDTH,
"invalid sample width %d bits for NIST SPHERE format",
track->f.sampleWidth);
return AF_NULL_FILESETUP;
}
else if (track->f.sampleFormat == AF_SAMPFMT_UNSIGNED)
{
_af_error(AF_BAD_SAMPFMT,
"NIST SPHERE format does not support unsigned data");
return AF_NULL_FILESETUP;
}
else if (track->f.sampleFormat == AF_SAMPFMT_FLOAT ||
track->f.sampleFormat == AF_SAMPFMT_DOUBLE)
{
_af_error(AF_BAD_SAMPFMT,
"NIST SPHERE format does not support floating-point data");
return AF_NULL_FILESETUP;
}
}
if (track->rateSet && track->f.sampleRate <= 0.0)
{
_af_error(AF_BAD_RATE,
"invalid sample rate %.30g for NIST SPHERE file",
track->f.sampleRate);
return AF_NULL_FILESETUP;
}
if (track->compressionSet && track->f.compressionType != AF_COMPRESSION_NONE &&
track->f.compressionType != AF_COMPRESSION_G711_ULAW &&
track->f.compressionType != AF_COMPRESSION_G711_ALAW)
{
_af_error(AF_BAD_NOT_IMPLEMENTED,
"NIST SPHERE format supports only G.711 u-law or A-law compression");
return AF_NULL_FILESETUP;
}
if (track->aesDataSet)
{
_af_error(AF_BAD_FILESETUP, "NIST SPHERE file cannot have AES data");
return AF_NULL_FILESETUP;
}
if (track->markersSet && track->markerCount != 0)
{
_af_error(AF_BAD_NUMMARKS, "NIST SPHERE format does not support markers");
return AF_NULL_FILESETUP;
}
if (setup->instrumentSet && setup->instrumentCount != 0)
{
_af_error(AF_BAD_NUMINSTS, "NIST SPHERE format does not support instruments");
return AF_NULL_FILESETUP;
}
/* XXXmpruett: We don't support miscellaneous chunks for now. */
if (setup->miscellaneousSet && setup->miscellaneousCount != 0)
{
_af_error(AF_BAD_NOT_IMPLEMENTED, "NIST SPHERE format does not currently support miscellaneous chunks");
return AF_NULL_FILESETUP;
}
return _af_filesetup_copy(setup, &nistDefaultFileSetup, true);
}
static bool nist_header_read_int (const char *header, const char *key, int *val)
{
const char *cp;
char keystring[256], scanstring[256];
snprintf(keystring, 256, "\n%s -i", key);
if ((cp = strstr(header, keystring)) != NULL)
{
snprintf(scanstring, 256, "\n%s -i %%d", key);
sscanf(cp, scanstring, val);
return true;
}
return false;
}
static bool nist_header_read_string (const char *header, const char *key, int *length, char *val)
{
const char *cp;
char keystring[256], scanstring[256];
snprintf(keystring, 256, "\n%s -s", key);
if ((cp = strstr(header, keystring)) != NULL)
{
snprintf(scanstring, 256, "\n%s -s%%d %%79s", key);
sscanf(cp, scanstring, length, val);
return true;
}
return false;
}
status NISTFile::readInit(AFfilesetup setup)
{
char header[NIST_SPHERE_HEADER_LENGTH + 1];
int intval;
char strval[NIST_SPHERE_MAX_FIELD_LENGTH];
int sample_n_bytes;
m_fh->seek(0, File::SeekFromBeginning);
if (m_fh->read(header, NIST_SPHERE_HEADER_LENGTH) != NIST_SPHERE_HEADER_LENGTH)
{
_af_error(AF_BAD_READ, "Could not read NIST SPHERE file header");
return AF_FAIL;
}
header[NIST_SPHERE_HEADER_LENGTH] = '\0';
if (memcmp(header, "NIST_1A\n 1024\n", 16) != 0)
{
_af_error(AF_BAD_FILEFMT, "Bad NIST SPHERE file header");
return AF_FAIL;
}
Track *track = allocateTrack();
if (!track)
return AF_FAIL;
// Read channel count.
if (nist_header_read_int(header, "channel_count", &intval))
{
if (intval < 1)
{
_af_error(AF_BAD_CHANNELS, "invalid number of channels %d",
intval);
return AF_FAIL;
}
track->f.channelCount = intval;
}
else
{
_af_error(AF_BAD_HEADER, "number of channels not specified");
return AF_FAIL;
}
// Read number of bytes per sample.
if (!nist_header_read_int(header, "sample_n_bytes", &sample_n_bytes))
{
_af_error(AF_BAD_HEADER, "bytes per sample not specified");
return AF_FAIL;
}
track->f.framesPerPacket = 1;
/*
Since some older NIST SPHERE files lack a sample_coding
field, if sample_n_bytes is 1, assume mu-law;
otherwise assume linear PCM.
*/
track->f.sampleFormat = AF_SAMPFMT_TWOSCOMP;
if (sample_n_bytes == 1)
{
track->f.compressionType = AF_COMPRESSION_G711_ULAW;
track->f.sampleWidth = 16;
track->f.bytesPerPacket = track->f.channelCount;
}
else
{
track->f.compressionType = AF_COMPRESSION_NONE;
track->f.sampleWidth = sample_n_bytes * 8;
track->f.computeBytesPerPacketPCM();
}
if (nist_header_read_string(header, "sample_coding", &intval, strval))
{
if (strcmp(strval, "pcm") == 0)
;
else if (strcmp(strval, "ulaw") == 0 || strcmp(strval, "mu-law") == 0)
{
track->f.compressionType = AF_COMPRESSION_G711_ULAW;
track->f.sampleWidth = 16;
}
else if (strcmp(strval, "alaw") == 0)
{
track->f.compressionType = AF_COMPRESSION_G711_ALAW;
track->f.sampleWidth = 16;
}
else
{
_af_error(AF_BAD_SAMPFMT,
"unrecognized NIST SPHERE sample format %s", strval);
return AF_FAIL;
}
}
// Read string representing byte order.
if (nist_header_read_string(header, "sample_byte_format", &intval, strval))
{
if (intval > 1)
{
if (strncmp(strval, "01", 2) == 0)
track->f.byteOrder = AF_BYTEORDER_LITTLEENDIAN;
else
track->f.byteOrder = AF_BYTEORDER_BIGENDIAN;
}
else
track->f.byteOrder = _AF_BYTEORDER_NATIVE;
}
else
{
/*
Fail if this field is not present and sample
width is more than one byte.
*/
if (track->f.compressionType == AF_COMPRESSION_NONE &&
track->f.sampleWidth > 8)
{
_af_error(AF_BAD_HEADER, "sample byte order not specified");
return AF_FAIL;
}
}
// Read significant bits per sample.
if (nist_header_read_int(header, "sample_sig_bits", &intval))
{
if (intval < 1 || intval > 32)
{
_af_error(AF_BAD_WIDTH, "invalid sample width %d bits\n",
intval);
return AF_FAIL;
}
/*
Use specified significant bits value as the
sample width for uncompressed data as long
as the number of bytes per sample remains
unchanged.
*/
if (track->f.compressionType == AF_COMPRESSION_NONE &&
(intval + 7) / 8 == sample_n_bytes)
{
track->f.sampleWidth = intval;
}
}
// Read sample rate.
if (nist_header_read_int(header, "sample_rate", &intval))
{
if (intval <= 0)
{
_af_error(AF_BAD_RATE, "invalid sample rate %d Hz\n", intval);
return AF_FAIL;
}
track->f.sampleRate = intval;
}
else
{
_af_error(AF_BAD_HEADER, "sample rate not specified");
return AF_FAIL;
}
// Read sample count.
if (nist_header_read_int(header, "sample_count", &intval))
{
track->totalfframes = intval;
}
else
{
_af_error(AF_BAD_HEADER, "number of samples not specified");
return AF_FAIL;
}
if (_af_set_sample_format(&track->f, track->f.sampleFormat,
track->f.sampleWidth) == AF_FAIL)
{
return AF_FAIL;
}
track->fpos_first_frame = NIST_SPHERE_HEADER_LENGTH;
track->data_size = m_fh->length() - NIST_SPHERE_HEADER_LENGTH;
track->nextfframe = 0;
track->fpos_next_frame = track->fpos_first_frame;
return AF_SUCCEED;
}
static const char *sample_byte_format (AudioFormat *fmt)
{
int nbytes = _af_format_sample_size(fmt, false);
assert(nbytes == 1 || nbytes == 2);
if (nbytes == 1)
return "0";
else if (nbytes == 2)
{
if (fmt->byteOrder == AF_BYTEORDER_BIGENDIAN)
return "10";
else
return "01";
}
/* NOTREACHED */
return NULL;
}
static const char *sample_coding (AudioFormat *fmt)
{
if (fmt->compressionType == AF_COMPRESSION_NONE)
return "pcm";
else if (fmt->compressionType == AF_COMPRESSION_G711_ULAW)
return "ulaw";
else if (fmt->compressionType == AF_COMPRESSION_G711_ALAW)
return "alaw";
/* NOTREACHED */
return NULL;
}
status NISTFile::writeHeader()
{
Track *track = getTrack();
char header[NIST_SPHERE_HEADER_LENGTH];
int printed = snprintf(header, NIST_SPHERE_HEADER_LENGTH,
"NIST_1A\n 1024\n"
"channel_count -i %d\n"
"sample_count -i %d\n"
"sample_rate -i %d\n"
"sample_n_bytes -i %d\n"
"sample_byte_format -s%d %s\n"
"sample_sig_bits -i %d\n"
"sample_coding -s%d %s\n"
"end_head\n",
track->f.channelCount,
(int) track->totalfframes,
(int) track->f.sampleRate,
(int) _af_format_sample_size(&track->f, false),
(int) _af_format_sample_size(&track->f, false), sample_byte_format(&track->f),
track->f.sampleWidth,
(int) strlen(sample_coding(&track->f)), sample_coding(&track->f));
/* Fill the remaining space in the buffer with space characters. */
if (printed < NIST_SPHERE_HEADER_LENGTH)
memset(header + printed, ' ', NIST_SPHERE_HEADER_LENGTH - printed);
return m_fh->write(header, NIST_SPHERE_HEADER_LENGTH) == NIST_SPHERE_HEADER_LENGTH ? AF_SUCCEED : AF_FAIL;
}
status NISTFile::writeInit(AFfilesetup setup)
{
if (initFromSetup(setup) == AF_FAIL)
return AF_FAIL;
Track *track = getTrack();
track->totalfframes = 0;
track->fpos_first_frame = NIST_SPHERE_HEADER_LENGTH;
track->nextfframe = 0;
track->fpos_next_frame = track->fpos_first_frame;
m_fh->seek(0, File::SeekFromBeginning);
writeHeader();
return AF_SUCCEED;
}
status NISTFile::update()
{
m_fh->seek(0, File::SeekFromBeginning);
writeHeader();
return AF_SUCCEED;
}