ref: f1a25692ec05e896866281bbf725fe915e3646fe
dir: /common/libsndfile/src/ircam.c/
/* ** Copyright (C) 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" /*------------------------------------------------------------------------------ ** Macros to handle big/little endian issues. */ /* The IRCAM magic number is weird in that one byte in the number can have ** values of 0x1, 0x2, 0x03 or 0x04. Hence the need for a marker and a mask. */ #define IRCAM_02_MARKER (MAKE_MARKER (0x00, 0x02, 0xA3, 0x64)) #define IRCAM_03_MARKER (MAKE_MARKER (0x64, 0xA3, 0x03, 0x00)) #define IRCAM_04_MARKER (MAKE_MARKER (0x64, 0xA3, 0x04, 0x00)) #define IRCAM_DATA_OFFSET (1024) /*------------------------------------------------------------------------------ ** Typedefs. */ enum { IRCAM_PCM_16 = 0x00002, IRCAM_FLOAT = 0x00004, IRCAM_ALAW = 0x10001, IRCAM_ULAW = 0x20001, IRCAM_PCM_32 = 0x40004 } ; /*------------------------------------------------------------------------------ ** Private static functions. */ static int ircam_close (SF_PRIVATE *psf) ; static int ircam_write_header (SF_PRIVATE *psf) ; static int get_encoding (SF_PRIVATE *psf) ; static char* get_encoding_str (int encoding) ; /*------------------------------------------------------------------------------ ** Public functions. */ int ircam_open_read (SF_PRIVATE *psf) { unsigned int marker, encoding ; float samplerate ; int error = SFE_NO_ERROR ; psf_binheader_readf (psf, "pm", 0, &marker) ; if (marker == IRCAM_03_MARKER) { psf->endian = SF_ENDIAN_LITTLE ; if (CPU_IS_LITTLE_ENDIAN) marker = ENDSWAP_INT (marker) ; psf_log_printf (psf, "marker: 0x%X => little endian\n", marker) ; psf_binheader_readf (psf, "fll", &samplerate, &(psf->sf.channels), &encoding) ; psf->sf.samplerate = (int) samplerate ; psf_log_printf (psf, " Sample Rate : %d\n", psf->sf.samplerate) ; psf_log_printf (psf, " Channels : %d\n", psf->sf.channels) ; psf_log_printf (psf, " Encoding : %X => %s\n", encoding, get_encoding_str (encoding)) ; } else if (marker == IRCAM_02_MARKER || marker == IRCAM_04_MARKER) { psf->endian = SF_ENDIAN_BIG ; if (CPU_IS_BIG_ENDIAN) marker = ENDSWAP_INT (marker) ; psf_log_printf (psf, "marker: 0x%X => big endian\n", marker) ; psf_binheader_readf (psf, "FLL", &samplerate, &(psf->sf.channels), &encoding) ; psf->sf.samplerate = (int) samplerate ; psf_log_printf (psf, " Sample Rate : %d\n", psf->sf.samplerate) ; psf_log_printf (psf, " Channels : %d\n", psf->sf.channels) ; psf_log_printf (psf, " Encoding : %X => %s\n", encoding, get_encoding_str (encoding)) ; } else return SFE_IRCAM_NO_MARKER ; /* Sanit checking for endian-ness detection. */ if (psf->sf.channels > 256) return SFE_IRCAM_BAD_CHANNELS ; psf->sf.sections = 1 ; psf->sf.seekable = SF_TRUE ; switch (encoding) { case IRCAM_PCM_16 : psf->sf.pcmbitwidth = 16 ; psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ; psf->blockwidth = psf->sf.channels * psf->bytewidth ; if (psf->endian == SF_ENDIAN_BIG) psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_PCM_BE ; else psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_PCM_LE ; error = pcm_read_init (psf) ; break ; case IRCAM_PCM_32 : psf->sf.pcmbitwidth = 32 ; psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ; psf->blockwidth = psf->sf.channels * psf->bytewidth ; if (psf->endian == SF_ENDIAN_BIG) psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_PCM_BE ; else psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_PCM_LE ; error = pcm_read_init (psf) ; break ; case IRCAM_FLOAT : psf->sf.pcmbitwidth = 32 ; psf->bytewidth = BITWIDTH2BYTES (psf->sf.pcmbitwidth) ; psf->blockwidth = psf->sf.channels * psf->bytewidth ; if (psf->endian == SF_ENDIAN_BIG) psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_FLOAT_BE ; else psf->sf.format = SF_FORMAT_IRCAM | SF_FORMAT_FLOAT_LE ; error = float32_read_init (psf) ; break ; default : error = SFE_IRCAM_UNKNOWN_FORMAT ; break ; } ; if (error) return error ; psf->dataoffset = IRCAM_DATA_OFFSET ; psf->datalength = psf->filelength - psf->dataoffset ; if (! psf->sf.samples && psf->blockwidth) psf->sf.samples = psf->datalength / psf->blockwidth ; psf_log_printf (psf, " Samples : %d\n", psf->sf.samples) ; psf_binheader_readf (psf, "p", IRCAM_DATA_OFFSET) ; return 0 ; } /* ircam_open_read */ /*------------------------------------------------------------------------------ */ int ircam_open_write (SF_PRIVATE *psf) { unsigned int encoding, subformat ; int error = SFE_NO_ERROR ; if ((psf->sf.format & SF_FORMAT_TYPEMASK) != SF_FORMAT_IRCAM) return SFE_BAD_OPEN_FORMAT ; subformat = psf->sf.format & SF_FORMAT_SUBMASK ; if (subformat == SF_FORMAT_ULAW || subformat == SF_FORMAT_ALAW) 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 = IRCAM_DATA_OFFSET ; psf->datalength = psf->blockwidth * psf->sf.samples ; psf->filelength = psf->datalength + psf->dataoffset ; if (! (encoding = ircam_write_header (psf))) return psf->error ; psf->close = (func_close) ircam_close ; psf->write_header = (func_wr_hdr) ircam_write_header ; switch (encoding) { case IRCAM_PCM_16 : /* 16-bit linear PCM. */ case IRCAM_PCM_32 : /* 32-bit linear PCM. */ error = pcm_write_init (psf) ; break ; case IRCAM_FLOAT : /* 32-bit linear PCM. */ error = float32_write_init (psf) ; break ; default : break ; } ; return error ; } /* ircam_open_write */ /*------------------------------------------------------------------------------ */ static int ircam_close (SF_PRIVATE *psf) { return 0 ; } /* ircam_close */ static int ircam_write_header (SF_PRIVATE *psf) { int encoding ; float samplerate ; /* This also sets psf->endian. */ encoding = get_encoding (psf) ; 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) ; samplerate = psf->sf.samplerate ; if (psf->endian == SF_ENDIAN_BIG) { psf_binheader_writef (psf, "mF", IRCAM_02_MARKER, samplerate) ; psf_binheader_writef (psf, "LL", psf->sf.channels, encoding) ; } else if (psf->endian == SF_ENDIAN_LITTLE) { psf_binheader_writef (psf, "mf", IRCAM_03_MARKER, samplerate) ; psf_binheader_writef (psf, "ll", psf->sf.channels, encoding) ; } else { psf->error = SFE_BAD_OPEN_FORMAT ; return encoding ; } ; psf_binheader_writef (psf, "z", IRCAM_DATA_OFFSET - psf->headindex) ; /* Header construction complete so write it out. */ fwrite (psf->header, psf->headindex, 1, psf->file) ; return encoding ; } /* ircam_write_header */ static int get_encoding (SF_PRIVATE *psf) { unsigned int format, bitwidth ; format = psf->sf.format & SF_FORMAT_SUBMASK ; bitwidth = psf->bytewidth * 8 ; /* Default endian-ness is the same as host processor unless overridden. */ if (format == SF_FORMAT_PCM_BE || format == SF_FORMAT_FLOAT_BE) psf->endian = SF_ENDIAN_BIG ; else if (format == SF_FORMAT_PCM_LE || format == SF_FORMAT_FLOAT_LE) psf->endian = SF_ENDIAN_LITTLE ; else if (CPU_IS_BIG_ENDIAN) psf->endian = SF_ENDIAN_BIG ; else psf->endian = SF_ENDIAN_LITTLE ; switch (format) { case SF_FORMAT_ULAW : return IRCAM_ULAW ; case SF_FORMAT_ALAW : return IRCAM_ALAW ; case SF_FORMAT_PCM : case SF_FORMAT_PCM_BE : case SF_FORMAT_PCM_LE : /* For PCM encoding, the header encoding field depends on the bitwidth. */ switch (bitwidth) { case 16 : return IRCAM_PCM_16 ; case 32 : return IRCAM_PCM_32 ; default : break ; } ; break ; case SF_FORMAT_FLOAT : case SF_FORMAT_FLOAT_BE : case SF_FORMAT_FLOAT_LE : return IRCAM_FLOAT ; default : break ; } ; return 0 ; } /* get_encoding */ static char* get_encoding_str (int encoding) { switch (encoding) { case IRCAM_PCM_16 : return "16 bit PCM" ; case IRCAM_FLOAT : return "32 bit float" ; case IRCAM_ALAW : return "A law" ; case IRCAM_ULAW : return "u law" ; case IRCAM_PCM_32 : return "32 bit PCM" ; } ; return "Unknown encoding" ; } /* get_encoding_str */