hpux_d_a.c

MIDI解码程序(用VC编写)

/*
    TiMidity++ -- MIDI to WAVE converter and player
    Copyright (C) 1999-2002 Masanao Izumo <[e-mail]>
    Copyright (C) 1995 Tuukka Toivonen <[e-mail]>

    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Functions to play sound on a HP's audio device

    Copyright 1997 Lawrence T. Hoff

*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

#include <sys/ioctl.h> 

#include <sys/audio.h>

#include "timidity.h"
#include "config.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 hpux_play_mode

PlayMode dpm = {
  DEFAULT_RATE, PE_16BIT|PE_SIGNED, PF_PCM_STREAM|PF_CAN_TRACE,
  -1,
  {0,0,0,0,0}, /* no extra parameters so far */
  "HP audio device", 'd',
  "/dev/audio",
  open_output,
  close_output,
  output_data,
  acntl
};

/*************************************************************************/
/*
   Encoding will be 16-bit linear signed, unless PE_ULAW is set, in
   which case it'll be 8-bit uLaw. I don't think it's worthwhile to
   implement any 8-bit linear modes as the sound quality is
   unrewarding. PE_MONO is honored.  */

static int open_output(void)
{

if (dpm.encoding & PE_ULAW)
  dpm.encoding &= ~PE_16BIT;

if (!(dpm.encoding & PE_16BIT))
  dpm.encoding &= ~PE_BYTESWAP;

dpm.fd = open(dpm.name, O_WRONLY, 0);
if(dpm.fd == -1)
    {
      ctl->cmsg(CMSG_ERROR, VERB_NORMAL, "%s: %s",
	   dpm.name, strerror(errno));
      return -1;
    }

(void) ioctl(dpm.fd, AUDIO_SET_SAMPLE_RATE, dpm.rate);

(void) ioctl(dpm.fd, AUDIO_SET_DATA_FORMAT, (dpm.encoding & PE_16BIT)?
	AUDIO_FORMAT_LINEAR16BIT: AUDIO_FORMAT_ULAW);

(void) ioctl(dpm.fd, AUDIO_SET_CHANNELS, (dpm.encoding & PE_MONO)?1:2);

/* set some reasonable buffer size */
(void) ioctl(dpm.fd, AUDIO_SET_TXBUFSIZE, 128*1024);

return 0;
}

static int output_data(char *buf, int32 nbytes)
{
    return write(dpm.fd, buf, nbytes);
}

static void close_output(void)
{
    if(dpm.fd != -1)
    {
	/* free resources */
	close(dpm.fd);
	dpm.fd = -1;
    }
}

static int acntl(int request, void *arg)
{
    switch(request)
    {
      case PM_REQ_DISCARD:
	return ioctl(dpm.fd, AUDIO_RESET, RESET_TX_BUF);
    }
    return -1;
}