text: /*
  ** Copyright (C) 2008-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
  **
  ** 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 "sfconfig.h"
  
  #include <stdio.h>
  #include <fcntl.h>
  #include <string.h>
  #include <ctype.h>
  
  #include "sndfile.h"
  #include "sfendian.h"
  #include "common.h"
  
  /*
  **	Info from Olivier Tristan <o.tristan@ultimatesoundbank.com>
  **
  **	HEADER
  **	2 magic bytes: 1 and 4.
  **	17 char for the name of the sample.
  **	3 bytes: level, tune and channels (0 for channels is mono while 1 is stereo)
  **	4 uint32: sampleStart, loopEnd, sampleFrames and loopLength
  **	1 byte: loopMode (0 no loop, 1 forward looping)
  **	1 byte: number of beat in loop
  **	1 uint16: sampleRate
  **
  **	DATA
  **	Data are always non compressed 16 bits interleaved
  */
  
  #define HEADER_LENGTH		42	/* Sum of above data fields. */
  #define HEADER_NAME_LEN		17	/* Length of name string. */
  
  #define	SFE_MPC_NO_MARKER	666
  
  /*------------------------------------------------------------------------------
  ** Private static functions.
  */
  
  static	int		mpc2k_close		(SF_PRIVATE *psf) ;
  
  static int		mpc2k_write_header (SF_PRIVATE *psf, int calc_length) ;
  static int		mpc2k_read_header (SF_PRIVATE *psf) ;
  
  /*------------------------------------------------------------------------------
  ** Public function.
  */
  
  int
  mpc2k_open	(SF_PRIVATE *psf)
  {	int		subformat ;
  	int		error = 0 ;
  
  	if (psf->file.mode == SFM_READ || (psf->file.mode == SFM_RDWR && psf->filelength > 0))
  	{	if ((error = mpc2k_read_header (psf)))
  			return error ;
  		} ;
  
  	if ((SF_CONTAINER (psf->sf.format)) != SF_FORMAT_MPC2K)
  		return	SFE_BAD_OPEN_FORMAT ;
  
  	subformat = SF_CODEC (psf->sf.format) ;
  
  	if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  	{	if (mpc2k_write_header (psf, SF_FALSE))
  			return psf->error ;
  
  		psf->write_header = mpc2k_write_header ;
  		} ;
  
  	psf->container_close = mpc2k_close ;
  
  	psf->blockwidth = psf->bytewidth * psf->sf.channels ;
  
  	error = pcm_init (psf) ;
  
  	return error ;
  } /* mpc2k_open */
  
  /*------------------------------------------------------------------------------
  */
  
  static int
  mpc2k_close	(SF_PRIVATE *psf)
  {
  	if (psf->file.mode == SFM_WRITE || psf->file.mode == SFM_RDWR)
  		mpc2k_write_header (psf, SF_TRUE) ;
  
  	return 0 ;
  } /* mpc2k_close */
  
  static int
  mpc2k_write_header (SF_PRIVATE *psf, int calc_length)
  {	char sample_name [HEADER_NAME_LEN + 1] ;
  	sf_count_t	current ;
  
  	if (psf->pipeoffset > 0)
  		return 0 ;
  
  	current = psf_ftell (psf) ;
  
  	if (calc_length)
  	{	psf->filelength = psf_get_filelen (psf) ;
  
  		psf->dataoffset = HEADER_LENGTH ;
  		psf->datalength = psf->filelength - psf->dataoffset ;
  
  		psf->sf.frames = psf->datalength / (psf->bytewidth * psf->sf.channels) ;
  		} ;
  
  	/* Reset the current header length to zero. */
  	psf->header [0] = 0 ;
  	psf->headindex = 0 ;
  
  	/*
  	** Only attempt to seek if we are not writng to a pipe. If we are
  	** writing to a pipe we shouldn't be here anyway.
  	*/
  	if (psf->is_pipe == SF_FALSE)
  		psf_fseek (psf, 0, SEEK_SET) ;
  
  	snprintf (sample_name, sizeof (sample_name), "%s                    ", psf->file.name.c) ;
  
  	psf_binheader_writef (psf, "e11b", 1, 4, sample_name, make_size_t (HEADER_NAME_LEN)) ;
  	psf_binheader_writef (psf, "e111", 100, 0, (psf->sf.channels - 1) & 1) ;
  	psf_binheader_writef (psf, "et4888", 0, psf->sf.frames, psf->sf.frames, psf->sf.frames) ;
  	psf_binheader_writef (psf, "e112", 0, 1, (uint16_t) psf->sf.samplerate) ;
  
  	/* Always 16 bit little endian data. */
  	psf->bytewidth = 2 ;
  	psf->endian = SF_ENDIAN_LITTLE ;
  
  	psf_fwrite (psf->header, psf->headindex, 1, psf) ;
  
  	if (psf->error)
  		return psf->error ;
  
  	psf->dataoffset = psf->headindex ;
  
  	if (current > 0)
  		psf_fseek (psf, current, SEEK_SET) ;
  
  	return psf->error ;
  } /* mpc2k_write_header */
  
  static int
  mpc2k_read_header (SF_PRIVATE *psf)
  {	char sample_name [HEADER_NAME_LEN + 1] ;
  	unsigned char bytes [4] ;
  	uint32_t sample_start, loop_end, sample_frames, loop_length ;
  	uint16_t sample_rate ;
  
  	psf_binheader_readf (psf, "pebb", 0, bytes, 2, sample_name, make_size_t (HEADER_NAME_LEN)) ;
  
  	if (bytes [0] != 1 || bytes [1] != 4)
  		return SFE_MPC_NO_MARKER ;
  
  	sample_name [HEADER_NAME_LEN] = 0 ;
  
  	psf_log_printf (psf, "MPC2000\n  Name         : %s\n", sample_name) ;
  
  	psf_binheader_readf (psf, "eb4444", bytes, 3, &sample_start, &loop_end, &sample_frames, &loop_length) ;
  
  	psf->sf.channels = bytes [2] ? 2 : 1 ;
  
  	psf_log_printf (psf, "  Level        : %d\n  Tune         : %d\n  Stereo       : %s\n", bytes [0], bytes [1], bytes [2] ? "Yes" : "No") ;
  
  	psf_log_printf (psf, "  Sample start : %d\n  Loop end     : %d\n  Frames       : %d\n  Length       : %d\n", sample_start, loop_end, sample_frames, loop_length) ;
  
  	psf_binheader_readf (psf, "eb2", bytes, 2, &sample_rate) ;
  
  	psf_log_printf (psf, "  Loop mode    : %s\n  Beats        : %d\n  Sample rate  : %d\nEnd\n", bytes [0] ? "None" : "Fwd", bytes [1], sample_rate) ;
  
  	psf->sf.samplerate = sample_rate ;
  
  	psf->sf.format = SF_FORMAT_MPC2K | SF_FORMAT_PCM_16 ;
  
  	psf->dataoffset = psf_ftell (psf) ;
  
  	/* Always 16 bit little endian data. */
  	psf->bytewidth = 2 ;
  	psf->endian = SF_ENDIAN_LITTLE ;
  
  	psf->datalength = psf->filelength - psf->dataoffset ;
  	psf->blockwidth = psf->sf.channels * psf->bytewidth ;
  	psf->sf.frames = psf->datalength / psf->blockwidth ;
  
  	psf->sf.frames = (psf->filelength - psf->dataoffset) / psf->blockwidth ;
  
  	return 0 ;
  } /* mpc2k_read_header */
  
  