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sun.c

/*
 * Copyright 2004-2005 Timo Hirvonen
 *
 * sun.c by alex <pukpuk@gmx.de>
 *
 * 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.
 */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/audioio.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>

#include "op.h"
#include "sf.h"
#include "xmalloc.h"

static sample_format_t sun_sf;
static int sun_fd = -1;

static char *sun_audio_device = NULL;

static int sun_reset(void)
{
      if (ioctl(sun_fd, AUDIO_FLUSH, NULL) == -1)
            return -1;

      return 0;
}

static int sun_set_sf(sample_format_t sf)
{
      struct audio_info ainf;

      AUDIO_INITINFO(&ainf);

      sun_reset();
      sun_sf = sf;

      ainf.play.channels = sf_get_channels(sun_sf);
      ainf.play.sample_rate = sf_get_rate(sun_sf);
      ainf.play.pause = 0;
      ainf.mode = AUMODE_PLAY;

      switch (sf_get_bits(sun_sf)) {
      case 16:
            ainf.play.precision = 16;
            if (sf_get_signed(sun_sf)) {
                  if (sf_get_bigendian(sun_sf))
                        ainf.play.encoding = AUDIO_ENCODING_SLINEAR_BE;
                  else
                        ainf.play.encoding = AUDIO_ENCODING_SLINEAR_LE;
            } else {
                  if (sf_get_bigendian(sun_sf))
                        ainf.play.encoding = AUDIO_ENCODING_ULINEAR_BE;
                  else
                        ainf.play.encoding = AUDIO_ENCODING_ULINEAR_LE;
            }
            break;
      case 8:
            ainf.play.precision = 8;
            if (sf_get_signed(sun_sf))
                  ainf.play.encoding = AUDIO_ENCODING_SLINEAR;
            else
                  ainf.play.encoding = AUDIO_ENCODING_ULINEAR;
            break;
      default:
            return -1;
      }

      if (ioctl(sun_fd, AUDIO_SETINFO, &ainf) == -1)
            return -1;

      if (ioctl(sun_fd, AUDIO_GETINFO, &ainf) == -1)
            return -1;

      /* FIXME: check if sample rate is supported */
      return 0;
}

static int sun_device_exists(const char *dev)
{
      struct stat s;

      if (stat(dev, &s))
            return 0;
      return 1;
}

static int sun_init(void)
{
      const char *audio_dev = "/dev/audio";

      if (sun_audio_device != NULL) {
            if (sun_device_exists(sun_audio_device))
                  return 0;
            free(sun_audio_device);
            sun_audio_device = NULL;
            return -1;
      }
      if (sun_device_exists(audio_dev)) {
            sun_audio_device = xstrdup(audio_dev);
            return 0;
      }

      return -1;
}

static int sun_exit(void)
{
      if (sun_audio_device != NULL) {
            free(sun_audio_device);
            sun_audio_device = NULL;
      }

      return 0;
}

static int sun_close(void)
{
      if (sun_fd != -1) {
            close(sun_fd);
            sun_fd = -1;
      }

      return 0;
}

static int sun_open(sample_format_t sf)
{
      sun_fd = open(sun_audio_device, O_WRONLY);
      if (sun_fd == -1)
            return -1;
      if (sun_set_sf(sf) == -1) {
            sun_close();
            return -1;
      }

      return 0;
}

static int sun_write(const char *buf, int cnt)
{
      const char *t;

      cnt /= 4;
      cnt *= 4;
      t = buf;
      while (cnt > 0) {
            int rc = write(sun_fd, buf, cnt);
            if (rc == -1) {
                  if (errno == EINTR)
                        continue;
                  else
                        return rc;
            }
            buf += rc;
            cnt -= rc;
      }

      return (buf - t);
}

static int sun_pause(void)
{
      struct audio_info ainf;

      AUDIO_INITINFO(&ainf);

      ainf.play.pause = 1;
      if (ioctl(sun_fd, AUDIO_SETINFO, &ainf) == -1)
            return -1;

      return 0;
}

static int sun_unpause(void)
{
      struct audio_info ainf;

      AUDIO_INITINFO(&ainf);

      ainf.play.pause = 0;
      if (ioctl(sun_fd, AUDIO_SETINFO, &ainf) == -1)
            return -1;

      return 0;
}

static int sun_buffer_space(void)
{
      struct audio_info ainf;
      int sp;

      AUDIO_INITINFO(&ainf);

      if (ioctl(sun_fd, AUDIO_GETINFO, &ainf) == -1)
            return -1;
      sp = ainf.play.buffer_size;

      return sp;
}

static int op_sun_set_option(int key, const char *val)
{
      switch (key) {
      case 0:
            free(sun_audio_device);
            sun_audio_device = xstrdup(val);
            break;
      default:
            return -OP_ERROR_NOT_OPTION;
      }

      return 0;
}

static int op_sun_get_option(int key, char **val)
{
      switch (key) {
      case 0:
            if (sun_audio_device)
                  *val = xstrdup(sun_audio_device);
            break;
      default:
            return -OP_ERROR_NOT_OPTION;
      }

      return 0;
}

const struct output_plugin_ops op_pcm_ops = {
      .init = sun_init,
      .exit = sun_exit,
      .open = sun_open,
      .close = sun_close,
      .write = sun_write,
      .pause = sun_pause,
      .unpause = sun_unpause,
      .buffer_space = sun_buffer_space,
      .set_option = op_sun_set_option,
      .get_option = op_sun_get_option
};

const char * const op_pcm_options[] = {
      "device",
      NULL
};

const int op_priority = 0;

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