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/* wave.c - functions to parse and verify WAVE headers
* Copyright (C) 2000-2007 Jason Jordan <shnutils@freeshell.org>
*
* 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.
*
* 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; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* $Id: wave.c,v 1.13 2007/03/23 05:49:48 jason Exp $
*/
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/stat.h>
#include "shorten.h"
#include "shn.h"
int is_valid_file(shn_file *info)
/* determines whether the given filename (info->filename) is a regular file, and is readable */
{
struct stat sz;
FILE *f;
if (0 != stat(info->wave_header.filename,&sz)) {
if (errno == ENOENT)
shn_error("cannot open '%s' because it does not exist",info->wave_header.filename);
else if (errno == EACCES)
shn_error("cannot open '%s' due to insufficient permissions",info->wave_header.filename);
else if (errno == EFAULT)
shn_error("cannot open '%s' due to bad address",info->wave_header.filename);
else if (errno == ENOMEM)
shn_error("cannot open '%s' because the kernel ran out of memory",info->wave_header.filename);
else if (errno == ENAMETOOLONG)
shn_error("cannot open '%s' because the file name is too long",info->wave_header.filename);
else
shn_error("cannot open '%s' due to an unknown problem",info->wave_header.filename);
return 0;
}
if (0 == S_ISREG(sz.st_mode)) {
if (S_ISLNK(sz.st_mode))
shn_error("'%s' is a symbolic link, not a regular file",info->wave_header.filename);
else if (S_ISDIR(sz.st_mode))
shn_error("'%s' is a directory, not a regular file",info->wave_header.filename);
else if (S_ISCHR(sz.st_mode))
shn_error("'%s' is a character device, not a regular file",info->wave_header.filename);
else if (S_ISBLK(sz.st_mode))
shn_error("'%s' is a block device, not a regular file",info->wave_header.filename);
else if (S_ISFIFO(sz.st_mode))
shn_error("'%s' is a fifo, not a regular file",info->wave_header.filename);
else if (S_ISSOCK(sz.st_mode))
shn_error("'%s' is a socket, not a regular file",info->wave_header.filename);
return 0;
}
info->wave_header.actual_size = (ulong)sz.st_size;
if (NULL == (f = fopen(info->wave_header.filename,"rb"))) {
shn_error("could not open '%s': %s",info->wave_header.filename,strerror(errno));
return 0;
}
fclose(f);
return 1;
}
int shn_verify_header(shn_file *this_shn)
{
ulong l;
int cur = 0;
if (0 == is_valid_file(this_shn))
{
shn_debug("while processing '%s': something went wrong while opening this file, see above",this_shn->wave_header.filename);
return 0;
}
if (this_shn->vars.bytes_in_header < CANONICAL_HEADER_SIZE) {
shn_debug("while processing '%s': header is only %d bytes (should be at least %d bytes)",
this_shn->wave_header.filename,this_shn->vars.bytes_in_header,CANONICAL_HEADER_SIZE);
return 0;
}
if (WAVE_RIFF != shn_uchar_to_ulong_le(this_shn->vars.header+cur))
{
if (AIFF_FORM == shn_uchar_to_ulong_le(this_shn->vars.header+cur))
shn_debug("while processing '%s': file contains AIFF data, which is currently not supported",this_shn->wave_header.filename);
else
shn_debug("while processing '%s': WAVE header is missing RIFF tag - possible corrupt file",this_shn->wave_header.filename);
return 0;
}
cur += 4;
this_shn->wave_header.chunk_size = shn_uchar_to_ulong_le(this_shn->vars.header+cur);
cur += 4;
if (WAVE_WAVE != shn_uchar_to_ulong_le(this_shn->vars.header+cur))
{
shn_debug("while processing '%s': WAVE header is missing WAVE tag",this_shn->wave_header.filename);
return 0;
}
cur += 4;
for (;;)
{
cur += 4;
l = shn_uchar_to_ulong_le(this_shn->vars.header+cur);
cur += 4;
if (WAVE_FMT == shn_uchar_to_ulong_le(this_shn->vars.header+cur-8))
break;
cur += l;
}
if (l < 16)
{
shn_debug("while processing '%s': fmt chunk in WAVE header was too short",this_shn->wave_header.filename);
return 0;
}
this_shn->wave_header.wave_format = shn_uchar_to_ushort_le(this_shn->vars.header+cur);
cur += 2;
switch (this_shn->wave_header.wave_format)
{
case WAVE_FORMAT_PCM:
break;
default:
shn_debug("while processing '%s': unsupported format 0x%04x (%s) - only PCM data is supported at this time",
this_shn->wave_header.filename,this_shn->wave_header.wave_format,shn_format_to_str(this_shn->wave_header.wave_format));
return 0;
}
this_shn->wave_header.channels = shn_uchar_to_ushort_le(this_shn->vars.header+cur);
cur += 2;
this_shn->wave_header.samples_per_sec = shn_uchar_to_ulong_le(this_shn->vars.header+cur);
cur += 4;
this_shn->wave_header.avg_bytes_per_sec = shn_uchar_to_ulong_le(this_shn->vars.header+cur);
cur += 4;
this_shn->wave_header.block_align = shn_uchar_to_ushort_le(this_shn->vars.header+cur);
cur += 2;
this_shn->wave_header.bits_per_sample = shn_uchar_to_ushort_le(this_shn->vars.header+cur);
cur += 2;
if (this_shn->wave_header.bits_per_sample != 8 && this_shn->wave_header.bits_per_sample != 16)
{
shn_debug("while processing '%s': bits per sample is neither 8 nor 16",this_shn->wave_header.filename);
return 0;
}
l -= 16;
if (l > 0)
cur += l;
for (;;)
{
cur += 4;
l = shn_uchar_to_ulong_le(this_shn->vars.header+cur);
cur += 4;
if (WAVE_DATA == shn_uchar_to_ulong_le(this_shn->vars.header+cur-8))
break;
cur += l;
}
this_shn->wave_header.rate = ((uint)this_shn->wave_header.samples_per_sec *
(uint)this_shn->wave_header.channels *
(uint)this_shn->wave_header.bits_per_sample) / 8;
this_shn->wave_header.header_size = cur;
this_shn->wave_header.data_size = l;
this_shn->wave_header.total_size = this_shn->wave_header.chunk_size + 8;
this_shn->wave_header.length = this_shn->wave_header.data_size / this_shn->wave_header.rate;
this_shn->wave_header.exact_length = (double)this_shn->wave_header.data_size / (double)this_shn->wave_header.rate;
if (this_shn->wave_header.channels == CD_CHANNELS &&
this_shn->wave_header.bits_per_sample == CD_BITS_PER_SAMPLE &&
this_shn->wave_header.samples_per_sec == CD_SAMPLES_PER_SEC &&
this_shn->wave_header.avg_bytes_per_sec == CD_RATE &&
this_shn->wave_header.rate == CD_RATE)
{
if (this_shn->wave_header.data_size < CD_MIN_BURNABLE_SIZE)
this_shn->wave_header.problems |= PROBLEM_CD_BUT_TOO_SHORT;
if (this_shn->wave_header.data_size % CD_BLOCK_SIZE != 0)
this_shn->wave_header.problems |= PROBLEM_CD_BUT_BAD_BOUND;
}
else
this_shn->wave_header.problems |= PROBLEM_NOT_CD_QUALITY;
if (this_shn->wave_header.header_size != CANONICAL_HEADER_SIZE)
this_shn->wave_header.problems |= PROBLEM_HEADER_NOT_CANONICAL;
if ((ulong)this_shn->wave_header.header_size + this_shn->wave_header.data_size > this_shn->wave_header.total_size)
this_shn->wave_header.problems |= PROBLEM_HEADER_INCONSISTENT;
if ((ulong)this_shn->wave_header.header_size + this_shn->wave_header.data_size < this_shn->wave_header.total_size)
this_shn->wave_header.problems |= PROBLEM_EXTRA_CHUNKS;
shn_length_to_str(this_shn);
/* header looks ok */
return 1;
}
char *shn_format_to_str(ushort format)
{
switch (format) {
case WAVE_FORMAT_UNKNOWN:
return "Microsoft Official Unknown";
case WAVE_FORMAT_PCM:
return "Microsoft PCM";
case WAVE_FORMAT_ADPCM:
return "Microsoft ADPCM";
case WAVE_FORMAT_IEEE_FLOAT:
return "IEEE Float";
case WAVE_FORMAT_ALAW:
return "Microsoft A-law";
case WAVE_FORMAT_MULAW:
return "Microsoft U-law";
case WAVE_FORMAT_OKI_ADPCM:
return "OKI ADPCM format";
case WAVE_FORMAT_IMA_ADPCM:
return "IMA ADPCM";
case WAVE_FORMAT_DIGISTD:
return "Digistd format";
case WAVE_FORMAT_DIGIFIX:
return "Digifix format";
case WAVE_FORMAT_DOLBY_AC2:
return "Dolby AC2";
case WAVE_FORMAT_GSM610:
return "GSM 6.10";
case WAVE_FORMAT_ROCKWELL_ADPCM:
return "Rockwell ADPCM";
case WAVE_FORMAT_ROCKWELL_DIGITALK:
return "Rockwell DIGITALK";
case WAVE_FORMAT_G721_ADPCM:
return "G.721 ADPCM";
case WAVE_FORMAT_G728_CELP:
return "G.728 CELP";
case WAVE_FORMAT_MPEG:
return "MPEG";
case WAVE_FORMAT_MPEGLAYER3:
return "MPEG Layer 3";
case WAVE_FORMAT_G726_ADPCM:
return "G.726 ADPCM";
case WAVE_FORMAT_G722_ADPCM:
return "G.722 ADPCM";
}
return "Unknown";
}
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