/* * This file has been modified for the cdrkit suite. * * The behaviour and appearence of the program code below can differ to a major * extent from the version distributed by the original author(s). * * For details, see Changelog file distributed with the cdrkit package. If you * received this file from another source then ask the distributing person for * a log of modifications. * */ /* @(#)audiosize.c 1.19 04/03/01 Copyright 1998-2004 J. Schilling */ /* * Copyright (c) 1998-2004 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 version 2 * as published by the Free Software Foundation. * * 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #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 BOOL is_auname(const char *name); off_t ausize(int f); BOOL is_wavname(const char *name); off_t wavsize(int f); BOOL is_auname(const char *name) { const char *p; if ((p = strrchr(name, '.')) == NULL) return (FALSE); return (streql(p, ".au")); } /* * Read Sun audio header, leave file seek pointer past auheader. */ off_t ausize(int f) { sun_au_t hdr; struct stat sb; mode_t mode; off_t size; Int32_t val; 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 = sb.st_mode & S_IFMT; if (!S_ISREG(mode) && !S_ISBLK(mode) && !S_ISCHR(mode)) 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; val = a_to_u_4_byte(hdr.encoding); if (val != SUN_AU_LINEAR16) goto err; val = a_to_u_4_byte(hdr.channels); if (val != 2) goto err; val = a_to_u_4_byte(hdr.sample_rate); if (val != 44100) goto err; size = (off_t)a_to_u_4_byte(hdr.hdr_size); if (size < (off_t)sizeof (hdr) || size > 512) goto err; lseek(f, 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 ((off_t)ret); } BOOL is_wavname(const char *name) { const char *p; if ((p = strrchr(name, '.')) == NULL) return (FALSE); return (streql(p, ".wav") || streql(p, ".WAV")); } /* * Read WAV header, leave file seek pointer past WAV header. */ off_t wavsize(int f) { chunk_t chunk; riff_chunk riff; fmt_chunk fmt; struct stat sb; off_t cursor; BOOL gotFormat; mode_t mode; off_t 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 = sb.st_mode & S_IFMT; if (!S_ISREG(mode) && !S_ISBLK(mode) && !S_ISCHR(mode)) return (-1L); cursor = (off_t)0; gotFormat = FALSE; for (;;) { if (read(f, &chunk, sizeof (chunk)) != sizeof (chunk)) goto err; size = (off_t)le_a_to_u_long(chunk.cksize); if (strncmp((char *)chunk.ckid, WAV_RIFF_MAGIC, 4) == 0) { /* * We found (first) RIFF header. Check if a WAVE * magic follows. Set up size to be able to skip * past this header. */ if (read(f, &riff, sizeof (riff)) != sizeof (riff)) goto err; if (strncmp((char *)riff.wave, WAV_WAVE_MAGIC, 4) != 0) goto err; size = (off_t)sizeof (riff); } else if (strncmp((char *)chunk.ckid, WAV_FMT_MAGIC, 4) == 0) { /* * We found WAVE "fmt " header. Check size (if it is * valid for a WAVE file) and coding whether it is * useable for a CD. */ if (size < (off_t)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) { /* * We found WAVE "data" header. This contains the * size value of the audio part. */ 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); }