ref: 7592cc985f084dbfab7f941100d1f09b33a43e22
dir: /common/libsndfile/src/au.c/
/* ** Copyright (C) 1999-2001 Erik de Castro Lopo <[email protected]> ** ** This program 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 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 Lesser General Public License for more details. ** ** You should have received a copy of the GNU Lesser 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. */ #include <stdio.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #include <ctype.h> #include "sndfile.h" #include "config.h" #include "sfendian.h" #include "common.h" #include "au.h" /*------------------------------------------------------------------------------ ** Macros to handle big/little endian issues. */ #define DOTSND_MARKER (MAKE_MARKER ('.', 's', 'n', 'd')) #define DNSDOT_MARKER (MAKE_MARKER ('d', 'n', 's', '.')) #define AU_DATA_OFFSET 24 /*------------------------------------------------------------------------------ ** Known AU file encoding types. */ enum { AU_ENCODING_ULAW_8 = 1, /* 8-bit u-law samples */ AU_ENCODING_PCM_8 = 2, /* 8-bit linear samples */ AU_ENCODING_PCM_16 = 3, /* 16-bit linear samples */ AU_ENCODING_PCM_24 = 4, /* 24-bit linear samples */ AU_ENCODING_PCM_32 = 5, /* 32-bit linear samples */ AU_ENCODING_FLOAT = 6, /* floating-point samples */ AU_ENCODING_DOUBLE = 7, /* double-precision float samples */ AU_ENCODING_INDIRECT = 8, /* fragmented sampled data */ AU_ENCODING_NESTED = 9, /* ? */ AU_ENCODING_DSP_CORE = 10, /* DSP program */ AU_ENCODING_DSP_DATA_8 = 11, /* 8-bit fixed-point samples */ AU_ENCODING_DSP_DATA_16 = 12, /* 16-bit fixed-point samples */ AU_ENCODING_DSP_DATA_24 = 13, /* 24-bit fixed-point samples */ AU_ENCODING_DSP_DATA_32 = 14, /* 32-bit fixed-point samples */ AU_ENCODING_DISPLAY = 16, /* non-audio display data */ AU_ENCODING_MULAW_SQUELCH = 17, /* ? */ AU_ENCODING_EMPHASIZED = 18, /* 16-bit linear with emphasis */ AU_ENCODING_NEXT = 19, /* 16-bit linear with compression (NEXT) */ AU_ENCODING_COMPRESSED_EMPHASIZED = 20, /* A combination of the two above */ AU_ENCODING_DSP_COMMANDS = 21, /* Music Kit DSP commands */ AU_ENCODING_DSP_COMMANDS_SAMPLES = 22, /* ? */ AU_ENCODING_ADPCM_G721_32 = 23, /* G721 32 kbs ADPCM - 4 bits per sample. */ AU_ENCODING_ADPCM_G722 = 24, AU_ENCODING_ADPCM_G723_24 = 25, /* G723 24 kbs ADPCM - 3 bits per sample. */ AU_ENCODING_ADPCM_G723_5 = 26, AU_ENCODING_ALAW_8 = 27 } ; /*------------------------------------------------------------------------------ ** Typedefs. */ typedef struct { int dataoffset ; int datasize ; int encoding ; int samplerate ; int channels ; } AU_FMT ; /*------------------------------------------------------------------------------ ** Private static functions. */ static int au_close (SF_PRIVATE *psf) ; static int get_encoding (unsigned int format, unsigned int bitwidth) ; static char const* get_encoding_str(int format) ; static int au_write_header (SF_PRIVATE *psf) ; /* static void endswap_au_fmt (AU_FMT *pau_fmt) ; */ /*------------------------------------------------------------------------------ ** Public functions. */ int au_open_read (SF_PRIVATE *psf) { AU_FMT au_fmt ; unsigned int marker, dword ; int error = SFE_NO_ERROR ; psf_binheader_readf (psf, "pm", 0, &marker) ; psf_log_printf (psf, "%D\n", marker) ; if (marker == DOTSND_MARKER) { psf->endian = SF_ENDIAN_BIG ; psf_binheader_readf (psf, "LLLLL", &(au_fmt.dataoffset), &(au_fmt.datasize), &(au_fmt.encoding), &(au_fmt.samplerate), &(au_fmt.channels)) ; } else if (marker == DNSDOT_MARKER) { psf->endian = SF_ENDIAN_LITTLE ; psf_binheader_readf (psf, "lllll", &(au_fmt.dataoffset), &(au_fmt.datasize), &(au_fmt.encoding), &(au_fmt.samplerate), &(au_fmt.channels)) ; } else return SFE_AU_NO_DOTSND ; psf_log_printf (psf, " Data Offset : %d\n", au_fmt.dataoffset) ; if (au_fmt.datasize == 0xFFFFFFFF || au_fmt.dataoffset + au_fmt.datasize == psf->filelength) psf_log_printf (psf, " Data Size : %d\n", au_fmt.datasize) ; else if (au_fmt.dataoffset + au_fmt.datasize < psf->filelength) { psf->filelength = au_fmt.dataoffset + au_fmt.dataoffset ; psf_log_printf (psf, " Data Size : %d\n", au_fmt.datasize) ; } else { dword = psf->filelength - au_fmt.dataoffset ; psf_log_printf (psf, " Data Size : %d (should be %d)\n", au_fmt.datasize, dword) ; au_fmt.datasize = dword ; } ; psf->dataoffset = au_fmt.dataoffset ; psf->datalength = psf->filelength - psf->dataoffset ; psf->current = 0 ; if (fseek (psf->file, psf->dataoffset, SEEK_SET)) return SFE_BAD_SEEK ; psf->close = (func_close) au_close ; psf->sf.samplerate = au_fmt.samplerate ; psf->sf.channels = au_fmt.channels ; /* Only fill in type major. */ if (psf->endian == SF_ENDIAN_BIG) psf->sf.format = SF_FORMAT_AU ; else if (psf->endian == SF_ENDIAN_LITTLE) psf->sf.format = SF_FORMAT_AULE ; psf->sf.sections = 1 ; psf_log_printf (psf, " Encoding : %d => %s\n", au_fmt.encoding, get_encoding_str (au_fmt.encoding)) ; psf_log_printf (psf, " Sample Rate : %d\n", au_fmt.samplerate) ; psf_log_printf (psf, " Channels : %d\n", au_fmt.channels) ; switch (au_fmt.encoding) { case AU_ENCODING_PCM_8 : psf->sf.pcmbitwidth = 8 ; psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ; psf->blockwidth = psf->sf.channels * psf->bytewidth ; psf->sf.format |= SF_FORMAT_PCM ; psf->chars = SF_CHARS_SIGNED ; if ((error = pcm_read_init (psf))) return error ; break ; case AU_ENCODING_PCM_16 : psf->sf.pcmbitwidth = 16 ; psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ; psf->blockwidth = psf->sf.channels * psf->bytewidth ; psf->sf.format |= SF_FORMAT_PCM ; if ((error = pcm_read_init (psf))) return error ; break ; case AU_ENCODING_PCM_24 : psf->sf.pcmbitwidth = 24 ; psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ; psf->blockwidth = psf->sf.channels * psf->bytewidth ; psf->sf.format |= SF_FORMAT_PCM ; if ((error = pcm_read_init (psf))) return error ; break ; case AU_ENCODING_PCM_32 : psf->sf.pcmbitwidth = 32 ; psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ; psf->blockwidth = psf->sf.channels * psf->bytewidth ; psf->sf.format |= SF_FORMAT_PCM ; if ((error = pcm_read_init (psf))) return error ; break ; case AU_ENCODING_FLOAT : psf->sf.pcmbitwidth = 32 ; psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ; psf->blockwidth = psf->sf.channels * psf->bytewidth ; psf->sf.format |= SF_FORMAT_FLOAT ; float32_read_init (psf) ; break ; default : error = SFE_AU_UNKNOWN_FORMAT ; break ; } ; if (error) return error ; if (! psf->sf.samples && psf->blockwidth) psf->sf.samples = au_fmt.datasize / psf->blockwidth ; return 0 ; } /* au_open_read */ /*------------------------------------------------------------------------------ */ int au_open_write (SF_PRIVATE *psf) { unsigned int encoding, format, subformat ; int error = 0 ; format = psf->sf.format & SF_FORMAT_TYPEMASK ; subformat = psf->sf.format & SF_FORMAT_SUBMASK ; if (format == SF_FORMAT_AU) psf->endian = SF_ENDIAN_BIG ; else if (format == SF_FORMAT_AULE) psf->endian = SF_ENDIAN_LITTLE ; else return SFE_BAD_OPEN_FORMAT ; if (subformat == SF_FORMAT_ULAW || subformat == SF_FORMAT_ALAW || subformat == SF_FORMAT_G721_32 || subformat == SF_FORMAT_G723_24) psf->bytewidth = 1 ; else psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ; psf->sf.seekable = SF_TRUE ; psf->error = 0 ; psf->blockwidth = psf->bytewidth * psf->sf.channels ; psf->dataoffset = AU_DATA_OFFSET ; psf->datalength = psf->blockwidth * psf->sf.samples ; psf->filelength = psf->datalength + psf->dataoffset ; if (! (encoding = au_write_header (psf))) return psf->error ; psf->close = (func_close) au_close ; psf->write_header = (func_wr_hdr) au_write_header ; switch (encoding) { case AU_ENCODING_PCM_8 : /* 8-bit linear PCM. */ psf->chars = SF_CHARS_SIGNED ; error = pcm_write_init (psf) ; break ; case AU_ENCODING_PCM_16 : /* 16-bit linear PCM. */ case AU_ENCODING_PCM_24 : /* 24-bit linear PCM */ case AU_ENCODING_PCM_32 : /* 32-bit linear PCM. */ error = pcm_write_init (psf) ; break ; case AU_ENCODING_FLOAT : /* 32-bit linear PCM. */ error = float32_write_init (psf) ; break ; default : break ; } ; return error ; } /* au_open_write */ /*------------------------------------------------------------------------------ */ static int au_close (SF_PRIVATE *psf) { if (psf->mode == SF_MODE_WRITE) { /* Now we know for certain the length of the file we can * re-write correct values for the datasize header element. */ fseek (psf->file, 0, SEEK_END) ; psf->filelength = ftell (psf->file) ; psf->datalength = psf->filelength - AU_DATA_OFFSET ; fseek (psf->file, 0, SEEK_SET) ; psf->sf.samples = psf->datalength / psf->blockwidth ; au_write_header (psf) ; } ; if (psf->fdata) free (psf->fdata) ; psf->fdata = NULL ; return 0 ; } /* au_close */ static int au_write_header (SF_PRIVATE *psf) { int encoding ; encoding = get_encoding (psf->sf.format & SF_FORMAT_SUBMASK, psf->bytewidth * 8) ; if (! encoding) { psf->error = SFE_BAD_OPEN_FORMAT ; return encoding ; } ; /* Reset the current header length to zero. */ psf->header [0] = 0 ; psf->headindex = 0 ; fseek (psf->file, 0, SEEK_SET) ; if (psf->endian == SF_ENDIAN_BIG) { psf_binheader_writef (psf, "mL", DOTSND_MARKER, AU_DATA_OFFSET) ; psf_binheader_writef (psf, "LLLL", psf->datalength, encoding, psf->sf.samplerate, psf->sf.channels) ; } else if (psf->endian == SF_ENDIAN_LITTLE) { psf_binheader_writef (psf, "ml", DNSDOT_MARKER, AU_DATA_OFFSET) ; psf_binheader_writef (psf, "llll", psf->datalength, encoding, psf->sf.samplerate, psf->sf.channels) ; } else { psf->error = SFE_BAD_OPEN_FORMAT ; return encoding ; } ; /* Header construction complete so write it out. */ fwrite (psf->header, psf->headindex, 1, psf->file) ; psf->dataoffset = psf->headindex ; return encoding ; } /* au_write_header */ static int get_encoding (unsigned int format, unsigned int bitwidth) { if (format == SF_FORMAT_ULAW) return AU_ENCODING_ULAW_8 ; if (format == SF_FORMAT_ALAW) return AU_ENCODING_ALAW_8 ; if (format == SF_FORMAT_G721_32) return AU_ENCODING_ADPCM_G721_32 ; if (format == SF_FORMAT_G723_24) return AU_ENCODING_ADPCM_G723_24 ; if (format == SF_FORMAT_FLOAT) return AU_ENCODING_FLOAT ; if (format != SF_FORMAT_PCM) return 0 ; /* For PCM encoding, the header encoding field depends on the bitwidth. */ switch (bitwidth) { case 8 : return AU_ENCODING_PCM_8 ; case 16 : return AU_ENCODING_PCM_16 ; case 24 : return AU_ENCODING_PCM_24 ; case 32 : return AU_ENCODING_PCM_32 ; default : break ; } ; return 0 ; } /* get_encoding */ /*- static void endswap_au_fmt (AU_FMT *pau_fmt) { pau_fmt->dataoffset = ENDSWAP_INT (pau_fmt->dataoffset) ; pau_fmt->datasize = ENDSWAP_INT (pau_fmt->datasize) ; pau_fmt->encoding = ENDSWAP_INT (pau_fmt->encoding) ; pau_fmt->samplerate = ENDSWAP_INT (pau_fmt->samplerate) ; pau_fmt->channels = ENDSWAP_INT (pau_fmt->channels) ; } /+* endswap_au_fmt *+/ -*/ static char const* get_encoding_str (int format) { switch (format) { case AU_ENCODING_ULAW_8 : return "8-bit ISDN u-law" ; case AU_ENCODING_PCM_8 : return "8-bit linear PCM" ; case AU_ENCODING_PCM_16 : return "16-bit linear PCM" ; case AU_ENCODING_PCM_24 : return "24-bit linear PCM" ; case AU_ENCODING_PCM_32 : return "32-bit linear PCM" ; case AU_ENCODING_FLOAT : return "32-bit float" ; case AU_ENCODING_ALAW_8 : return "8-bit ISDN A-law" ; case AU_ENCODING_ADPCM_G721_32 : return "G721 32kbs ADPCM" ; case AU_ENCODING_ADPCM_G723_24 : return "G723 24kbs ADPCM" ; case AU_ENCODING_NEXT : return "Weird NeXT encoding format (unsupported)" ; } ; return "Unknown!!" ; } /* get_encoding_str */