/*

    TiMidity++ -- MIDI to WAVE converter and player
    Copyright (C) 1999 Masanao Izumo <mo@goice.co.jp>
    Copyright (C) 1995 Tuukka Toivonen <tt@cgs.fi>

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

    wave_audio.c

    Functions to output RIFF WAVE format data to a file or stdout.

*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdio.h>

#ifdef __W32__
#include <stdlib.h>
#include <io.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */

#ifndef NO_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include <fcntl.h>

#ifdef __FreeBSD__
#include <stdio.h>
#endif

#include "timidity.h"
#include "output.h"
#include "controls.h"

static int open_output(void); /* 0=success, 1=warning, -1=fatal error */
static void close_output(void);
static int output_data(char *buf, int32 bytes);
static int acntl(int request, void *arg);

/* export the playback mode */

#define dpm wave_play_mode

PlayMode dpm = {
    DEFAULT_RATE,
#ifdef LITTLE_ENDIAN
    PE_16BIT|PE_SIGNED,
#else
    PE_16BIT|PE_SIGNED|PE_BYTESWAP,
#endif
    PF_PCM_STREAM,
    -1,
    {0,0,0,0,0},
    "RIFF WAVE file", 'w',
    "output.wav",
    open_output,
    close_output,
    output_data,
    acntl
};

#define UPDATE_HEADER_STEP (128*1024) /* 128KB */
static uint32 bytes_output, next_bytes;
static int already_warning_lseek;

/*************************************************************************/

static char *orig_RIFFheader=
  "RIFF" "\377\377\377\377"
  "WAVE" "fmt " "\020\000\000\000" "\001\000"
  /* 22: channels */ "\001\000"
  /* 24: frequency */ "xxxx"
  /* 28: bytes/second */ "xxxx"
  /* 32: bytes/sample */ "\004\000"
  /* 34: bits/sample */ "\020\000"
  "data" "\377\377\377\377"
;


/* We support follows WAVE format:
 * 8 bit unsigned pcm
 * 16 bit signed pcm (little endian)
 * A-law
 * U-law
 */

/* Windows WAVE File Encoding Tags */
#define WAVE_FORMAT_PCM       0x01
#define WAVE_FORMAT_ALAW      0x06
#define WAVE_FORMAT_MULAW     0x07


static int open_output(void)
{
    char RIFFheader[44];
    int t;
    int include_enc, exclude_enc;

    include_enc = exclude_enc = 0;
    if(dpm.encoding & PE_16BIT)
    {
#ifdef LITTLE_ENDIAN
	exclude_enc = PE_BYTESWAP;
#else
	include_enc = PE_BYTESWAP;
#endif /* LITTLE_ENDIAN */
	include_enc |= PE_SIGNED;
    }
    else if(!(dpm.encoding & (PE_ULAW|PE_ALAW)))
    {
	exclude_enc = PE_SIGNED;
    }

    dpm.encoding = validate_encoding(dpm.encoding, include_enc, exclude_enc);

    if (dpm.name && dpm.name[0]=='-' && dpm.name[1]=='\0')
	dpm.fd = 1; /* data to stdout */
    else
    {
	/* Open the audio file */
	dpm.fd = open(dpm.name, FILE_OUTPUT_MODE);
	if(dpm.fd<0)
	{
	    ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s",
		      dpm.name, strerror(errno));
	    return -1;
	}
    }

  /* Generate a (rather non-standard) RIFF header. We don't know yet
     what the block lengths will be. We'll fix that at close if this
     is a seekable file. */

    memcpy(RIFFheader, orig_RIFFheader, 44);

    if(dpm.encoding & PE_ALAW)
	RIFFheader[20] = WAVE_FORMAT_ALAW;
    else if(dpm.encoding & PE_ULAW)
	RIFFheader[20] = WAVE_FORMAT_MULAW;
    else
	RIFFheader[20] = WAVE_FORMAT_PCM;

    if(dpm.encoding & PE_MONO)
	RIFFheader[22] = 1;
    else
	RIFFheader[22] = 2;

    *((int *)(RIFFheader+24)) = LE_LONG(dpm.rate);

    t = dpm.rate;
    if(!(dpm.encoding & PE_MONO)) t *= 2;
    if(dpm.encoding & PE_16BIT)   t *= 2;
    *((int *)(RIFFheader+28)) = LE_LONG(t);

    /* Bug fixed from Masaaki Koyanagi <koya@k2.t.u-tokyo.ac.jp> */
    if((dpm.encoding & (PE_MONO | PE_16BIT)) == PE_MONO)
	RIFFheader[32]='\001';
    else if (!(dpm.encoding & PE_MONO) && (dpm.encoding & PE_16BIT))
	RIFFheader[32]='\004';
    else
	RIFFheader[32]='\002';

    if(dpm.encoding & PE_16BIT)
	RIFFheader[34] = 16;
    else
	RIFFheader[34] = 8;

    if(write(dpm.fd, RIFFheader, 44) == -1)
    {
	ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: write: %s",
		  dpm.name, strerror(errno));
	close(dpm.fd);
	dpm.fd = -1;
	return -1;
    }

    /* Reset the length counter */
    bytes_output = 0;
    next_bytes = bytes_output + UPDATE_HEADER_STEP;
    already_warning_lseek = 0;

    return 0;
}

static int update_header(void)
{
    off_t save_point;
    int32 tmp;

    if(already_warning_lseek)
	return 0;

    save_point = lseek(dpm.fd, 0, SEEK_CUR);
    if(save_point == -1 || lseek(dpm.fd, 4, SEEK_SET) == -1)
    {
	ctl->cmsg(CMSG_WARNING, VERB_VERBOSE,
		  "Warning: %s: %s: Can't make valid header",
		  dpm.name, strerror(errno));
	already_warning_lseek = 1;
	return 0;
    }

    tmp = LE_LONG(bytes_output + 44 - 8);
    if(write(dpm.fd, &tmp, 4) == -1)
    {
	lseek(dpm.fd, save_point, SEEK_SET);
	return -1;
    }
    lseek(dpm.fd, 40, SEEK_SET);
    tmp = LE_LONG(bytes_output);
    write(dpm.fd, &tmp, 4);

    lseek(dpm.fd, save_point, SEEK_SET);
    ctl->cmsg(CMSG_INFO, VERB_DEBUG,
	      "%s: Update RIFF WAVE header (size=%d)", dpm.name, bytes_output);

    return 0;
}

static int output_data(char *buf, int32 bytes)
{
    int n;

    while(((n = write(dpm.fd, buf, bytes)) == -1) && errno == EINTR)
	;
    if(n == -1)
    {
	ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s",
		  dpm.name, strerror(errno));
	return -1;
    }

    bytes_output += bytes;

#if UPDATE_HEADER_STEP > 0
    if(bytes_output >= next_bytes)
    {
	if(update_header() == -1)
	    return -1;
	next_bytes = bytes_output + UPDATE_HEADER_STEP;
    }
#endif /* UPDATE_HEADER_STEP */
    return n;
}

static void close_output(void)
{
    if(dpm.fd != 1 && /* We don't close stdout */
       dpm.fd != -1)
    {
	update_header();
	close(dpm.fd);
	dpm.fd = -1;
    }
}

static int acntl(int request, void *arg)
{
    switch(request)
    {
      case PM_REQ_DISCARD:
	return 0;
    }
    return -1;
}
