www.pudn.com > cdrecord.zip > audiosize.c
/* @(#)audiosize.c 1.9 98/05/06 Copyright 1998 J. Schilling */
#ifndef lint
static char sccsid[] =
"@(#)audiosize.c 1.9 98/05/06 Copyright 1998 J. Schilling";
#endif
/*
* Copyright (c) 1998 J. Schilling
*
* First .vaw implementation made by Dave Platt
* Current .wav implementation with additional help from Heiko Eißfeld.
*/
/*
* 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, 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; see the file COPYING. If not, write to
* the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include
#include
#include
#include
#include
#include
#include
#include "auheader.h"
typedef struct {
Uchar magic[4];
Uchar hdr_size[4];
Uchar data_size[4];
Uchar encoding[4];
Uchar sample_rate[4];
Uchar channels[4];
} sun_au_t;
#define SUN_AU_MAGIC ".snd"
#define SUN_AU_UNKNOWN_LEN ((Uint)~0)
#define SUN_AU_ULAW8 1 /* American ISDN Telephonie */
#define SUN_AU_LINEAR8 2 /* Linear PCM 8 bit/channel */
#define SUN_AU_LINEAR16 3 /* Linear PCM 16 bit/channel */
#define SUN_AU_LINEAR24 4 /* Linear PCM 24 bit/channel */
#define SUN_AU_LINEAR32 5 /* Linear PCM 32 bit/channel */
#define SUN_AU_FLOAT 6 /* 32 bit IEEE floatingpoint */
#define SUN_AU_DOUBLE 7 /* 64 bit IEEE floatingpoint */
#define SUN_AU_G721 23 /* 4 bit CCITT G.721 ADPCM */
#define SUN_AU_G722 24 /* CCITT G.722 ADPCM */
#define SUN_AU_G723_3 25 /* 3 bit CCITT G.723 ADPCM */
#define SUN_AU_G723_5 26 /* 5 bit CCITT G.723 ADPCM */
#define SUN_AU_ALAW8 27 /* International ISDN Tel. */
typedef struct {
Uchar ckid[4];
Uchar cksize[4];
} chunk_t;
typedef struct {
Uchar wave[4];
} riff_chunk;
typedef struct {
Uchar fmt_tag[2];
Uchar channels[2];
Uchar sample_rate[4];
Uchar av_byte_rate[4];
Uchar block_size[2];
Uchar bits_per_sample[2];
} fmt_chunk;
#define WAV_RIFF_MAGIC "RIFF" /* Magic for file format */
#define WAV_WAVE_MAGIC "WAVE" /* Magic for Waveform Audio */
#define WAV_FMT_MAGIC "fmt " /* Start of Waveform format */
#define WAV_DATA_MAGIC "data" /* Start of data chunk */
#define WAV_FORMAT_PCM 0x0001 /* Linear PCM format */
#define WAV_FORMAT_ULAW 0x0101 /* American ISDN Telephonie */
#define WAV_FORMAT_ALAW 0x0102 /* International ISDN Tel. */
#define WAV_FORMAT_ADPCM 0x0103 /* ADPCM format */
#define le_a_to_u_short(a) ((unsigned short) \
((((unsigned char*) a)[0] & 0xFF) | \
(((unsigned char*) a)[1] << 8 & 0xFF00)))
#ifdef __STDC__
#define le_a_to_u_long(a) ((unsigned long) \
((((unsigned char*) a)[0] & 0xFF) | \
(((unsigned char*) a)[1] << 8 & 0xFF00) | \
(((unsigned char*) a)[2] << 16 & 0xFF0000) | \
(((unsigned char*) a)[3] << 24 & 0xFF000000UL)))
#else
#define le_a_to_u_long(a) ((unsigned long) \
((((unsigned char*) a)[0] & 0xFF) | \
(((unsigned char*) a)[1] << 8 & 0xFF00) | \
(((unsigned char*) a)[2] << 16 & 0xFF0000) | \
(((unsigned char*) a)[3] << 24 & 0xFF000000)))
#endif
EXPORT BOOL is_auname __PR((const char *name));
EXPORT long ausize __PR((int f));
EXPORT BOOL is_wavname __PR((const char *name));
EXPORT long wavsize __PR((int f));
EXPORT BOOL is_auname(name)
const char *name;
{
const char *p;
if ((p = strrchr(name, '.')) == NULL)
return (FALSE);
return (streql(p, ".au"));
}
EXPORT long
ausize(f)
int f;
{
sun_au_t hdr;
struct stat sb;
long mode;
long size;
long ret = AU_BAD_HEADER;
/*
* First check if a bad guy tries to call ausize()
* with an unappropriate file descriptor.
* return -1 in this case.
*/
if (isatty(f))
return (-1L);
if (fstat(f, &sb) < 0)
return (-1L);
mode = (long)(sb.st_mode & S_IFMT);
if (mode != S_IFREG && mode != S_IFBLK && mode != S_IFCHR)
return (-1L);
if (read(f, &hdr, sizeof(hdr)) != sizeof(hdr))
goto err;
if (strncmp((char *)hdr.magic, SUN_AU_MAGIC, 4) != 0)
goto err;
ret = AU_BAD_CODING;
size = a_to_u_long(hdr.encoding);
if (size != SUN_AU_LINEAR16)
goto err;
size = a_to_u_long(hdr.channels);
if (size != 2)
goto err;
size = a_to_u_long(hdr.sample_rate);
if (size != 44100)
goto err;
size = a_to_u_long(hdr.hdr_size);
if (size < sizeof(hdr) || size > 512)
goto err;
lseek(f, (off_t)size, SEEK_SET);
/*
* Most .au files don't seem to honor the data_size field,
* so we use the whole file size without the header.
*/
size = sb.st_size - size;
return (size);
err:
lseek(f, (off_t)0L, SEEK_SET);
return (ret);
}
EXPORT BOOL is_wavname(name)
const char *name;
{
const char *p;
if ((p = strrchr(name, '.')) == NULL)
return (FALSE);
return (streql(p, ".wav") || streql(p, ".WAV"));
}
EXPORT long
wavsize(f)
int f;
{
chunk_t chunk;
riff_chunk riff;
fmt_chunk fmt;
struct stat sb;
long cursor;
BOOL gotFormat;
long mode;
long size;
long ret = AU_BAD_HEADER;
/*
* First check if a bad guy tries to call wavsize()
* with an unappropriate file descriptor.
* return -1 in this case.
*/
if (isatty(f))
return (-1L);
if (fstat(f, &sb) < 0)
return (-1L);
mode = (long)(sb.st_mode & S_IFMT);
if (mode != S_IFREG && mode != S_IFBLK && mode != S_IFCHR)
return (-1L);
cursor = 0;
gotFormat = FALSE;
for (;;) {
if (read(f, &chunk, sizeof (chunk)) != sizeof (chunk))
goto err;
size = le_a_to_u_long(chunk.cksize);
if (strncmp((char *)chunk.ckid, WAV_RIFF_MAGIC, 4) == 0) {
if (read(f, &riff, sizeof (riff)) != sizeof (riff))
goto err;
if (strncmp((char *)riff.wave, WAV_WAVE_MAGIC, 4) != 0)
goto err;
size = sizeof (riff);
} else if (strncmp((char *)chunk.ckid, WAV_FMT_MAGIC, 4) == 0) {
if (size < sizeof (fmt)) goto err;
if (sizeof (fmt) != read(f, &fmt, sizeof (fmt))) goto err;
if (le_a_to_u_short(fmt.channels) != 2 ||
le_a_to_u_long(fmt.sample_rate) != 44100 ||
le_a_to_u_short(fmt.bits_per_sample) != 16) {
ret = AU_BAD_CODING;
goto err;
}
gotFormat = TRUE;
} else if (strncmp((char *)chunk.ckid, WAV_DATA_MAGIC, 4) == 0) {
if (!gotFormat) {
ret = AU_BAD_CODING;
goto err;
}
if ((cursor + size + sizeof (chunk)) > sb.st_size)
size = sb.st_size - (cursor + sizeof (chunk));
return (size);
}
cursor += size + sizeof (chunk);
lseek(f, cursor, SEEK_SET); /* Skip over current chunk */
}
err:
lseek(f, (off_t)0L, SEEK_SET);
return (ret);
}