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control.c

/*
 *  A simple PCM loopback utility
 *  Copyright (c) 2010 by Jaroslav Kysela <perex@perex.cz>
 *
 *     Author: Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   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 <ctype.h>
#include <syslog.h>
#include <alsa/asoundlib.h>
#include "alsaloop.h"

static char *id_str(snd_ctl_elem_id_t *id)
{
      static char str[128];

      sprintf(str, "%i,%s,%i,%i,%s,%i",
            snd_ctl_elem_id_get_numid(id),
            snd_ctl_elem_iface_name(snd_ctl_elem_id_get_interface(id)),
            snd_ctl_elem_id_get_device(id),
            snd_ctl_elem_id_get_subdevice(id),
            snd_ctl_elem_id_get_name(id),
            snd_ctl_elem_id_get_index(id));
      return str;
}

int control_parse_id(const char *str, snd_ctl_elem_id_t *id)
{
      int c, size, numid;
      char *ptr;

      while (*str == ' ' || *str == '\t')
            str++;
      if (!(*str))
            return -EINVAL;
      snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);      /* default */
      while (*str) {
            if (!strncasecmp(str, "numid=", 6)) {
                  str += 6;
                  numid = atoi(str);
                  if (numid <= 0) {
                        logit(LOG_CRIT, "Invalid numid %d\n", numid);
                        return -EINVAL;
                  }
                  snd_ctl_elem_id_set_numid(id, atoi(str));
                  while (isdigit(*str))
                        str++;
            } else if (!strncasecmp(str, "iface=", 6)) {
                  str += 6;
                  if (!strncasecmp(str, "card", 4)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_CARD);
                        str += 4;
                  } else if (!strncasecmp(str, "mixer", 5)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_MIXER);
                        str += 5;
                  } else if (!strncasecmp(str, "pcm", 3)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_PCM);
                        str += 3;
                  } else if (!strncasecmp(str, "rawmidi", 7)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_RAWMIDI);
                        str += 7;
                  } else if (!strncasecmp(str, "timer", 5)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_TIMER);
                        str += 5;
                  } else if (!strncasecmp(str, "sequencer", 9)) {
                        snd_ctl_elem_id_set_interface(id, SND_CTL_ELEM_IFACE_SEQUENCER);
                        str += 9;
                  } else {
                        return -EINVAL;
                  }
            } else if (!strncasecmp(str, "name=", 5)) {
                  char buf[64];
                  str += 5;
                  ptr = buf;
                  size = 0;
                  if (*str == '\'' || *str == '\"') {
                        c = *str++;
                        while (*str && *str != c) {
                              if (size < (int)sizeof(buf)) {
                                    *ptr++ = *str;
                                    size++;
                              }
                              str++;
                        }
                        if (*str == c)
                              str++;
                  } else {
                        while (*str && *str != ',') {
                              if (size < (int)sizeof(buf)) {
                                    *ptr++ = *str;
                                    size++;
                              }
                              str++;
                        }
                  }
                  *ptr = '\0';
                  snd_ctl_elem_id_set_name(id, buf);
            } else if (!strncasecmp(str, "index=", 6)) {
                  str += 6;
                  snd_ctl_elem_id_set_index(id, atoi(str));
                  while (isdigit(*str))
                        str++;
            } else if (!strncasecmp(str, "device=", 7)) {
                  str += 7;
                  snd_ctl_elem_id_set_device(id, atoi(str));
                  while (isdigit(*str))
                        str++;
            } else if (!strncasecmp(str, "subdevice=", 10)) {
                  str += 10;
                  snd_ctl_elem_id_set_subdevice(id, atoi(str));
                  while (isdigit(*str))
                        str++;
            }
            if (*str == ',') {
                  str++;
            } else {
                  if (*str)
                        return -EINVAL;
            }
      }
      return 0;
}

int control_id_match(snd_ctl_elem_id_t *id1, snd_ctl_elem_id_t *id2)
{
      if (snd_ctl_elem_id_get_interface(id1) !=
          snd_ctl_elem_id_get_interface(id2))
            return 0;
      if (snd_ctl_elem_id_get_device(id1) !=
          snd_ctl_elem_id_get_device(id2))
            return 0;
      if (snd_ctl_elem_id_get_subdevice(id1) !=
          snd_ctl_elem_id_get_subdevice(id2))
            return 0;
      if (strcmp(snd_ctl_elem_id_get_name(id1),
               snd_ctl_elem_id_get_name(id2)) != 0)
            return 0;
      if (snd_ctl_elem_id_get_index(id1) !=
          snd_ctl_elem_id_get_index(id2))
            return 0;
      return 1;
}

static int control_init1(struct loopback_handle *lhandle,
                   struct loopback_control *ctl)
{
      int err;

      snd_ctl_elem_info_set_id(ctl->info, ctl->id);
      snd_ctl_elem_value_set_id(ctl->value, ctl->id);
      if (lhandle->ctl == NULL) {
            logit(LOG_WARNING, "Unable to read control info for '%s'\n", id_str(ctl->id));
            return -EIO;
      }
      err = snd_ctl_elem_info(lhandle->ctl, ctl->info);
      if (err < 0) {
            logit(LOG_WARNING, "Unable to read control info '%s': %s\n", id_str(ctl->id), snd_strerror(err));
            return err;
      }
      err = snd_ctl_elem_read(lhandle->ctl, ctl->value);
      if (err < 0) {
            logit(LOG_WARNING, "Unable to read control value (init1) '%s': %s\n", id_str(ctl->id), snd_strerror(err));
            return err;
      }
      return 0;
}

static int copy_value(struct loopback_control *dst,
                  struct loopback_control *src)
{
      snd_ctl_elem_type_t type;
      unsigned int count;
      int i;

      type = snd_ctl_elem_info_get_type(dst->info);
      count = snd_ctl_elem_info_get_count(dst->info);
      switch (type) {
      case SND_CTL_ELEM_TYPE_BOOLEAN:
            for (i = 0; i < count; i++)
                  snd_ctl_elem_value_set_boolean(dst->value,
                        i, snd_ctl_elem_value_get_boolean(src->value, i));
            break;
      case SND_CTL_ELEM_TYPE_INTEGER:
            for (i = 0; i < count; i++) {
                  snd_ctl_elem_value_set_integer(dst->value,
                        i, snd_ctl_elem_value_get_integer(src->value, i));
            }
            break;
      default:
            logit(LOG_CRIT, "Unable to copy control value for type %s\n", snd_ctl_elem_type_name(type));
            return -EINVAL;
      }
      return 0;
}

static int oss_set(struct loopback *loop,
               struct loopback_ossmixer *ossmix,
               int enable)
{
      char buf[128], file[128];
      int fd;

      if (loop->capt->card_number < 0)
            return 0;
      if (!enable) {
            sprintf(buf, "%s \"\" 0\n", ossmix->oss_id);
      } else {
            sprintf(buf, "%s \"%s\" %i\n", ossmix->oss_id, ossmix->alsa_id, ossmix->alsa_index);
      }
      sprintf(file, "/proc/asound/card%i/oss_mixer", loop->capt->card_number);
      if (verbose)
            snd_output_printf(loop->output, "%s: Initialize OSS volume %s: %s", loop->id, file, buf);
      fd = open(file, O_WRONLY);
      if (fd >= 0 && write(fd, buf, strlen(buf)) == strlen(buf)) {
            close(fd);
            return 0;
      }
      if (fd >= 0)
            close(fd);
      logit(LOG_INFO, "%s: Unable to initialize OSS Mixer ID '%s'\n", loop->id, ossmix->oss_id);
      return -1;
}

static int control_init2(struct loopback *loop,
                   struct loopback_mixer *mix)
{
      snd_ctl_elem_type_t type;
      unsigned int count;
      int err;

      snd_ctl_elem_info_copy(mix->dst.info, mix->src.info);
      snd_ctl_elem_info_set_id(mix->dst.info, mix->dst.id);
      snd_ctl_elem_value_clear(mix->dst.value);
      snd_ctl_elem_value_set_id(mix->dst.value, mix->dst.id);
      type = snd_ctl_elem_info_get_type(mix->dst.info);
      count = snd_ctl_elem_info_get_count(mix->dst.info);
      snd_ctl_elem_remove(loop->capt->ctl, mix->dst.id);
      switch (type) {
      case SND_CTL_ELEM_TYPE_BOOLEAN:
            err = snd_ctl_elem_add_boolean(loop->capt->ctl,
                                     mix->dst.id, count);
            copy_value(&mix->dst, &mix->src);
            break;
      case SND_CTL_ELEM_TYPE_INTEGER:
            err = snd_ctl_elem_add_integer(loop->capt->ctl,
                        mix->dst.id, count,
                        snd_ctl_elem_info_get_min(mix->dst.info),
                        snd_ctl_elem_info_get_max(mix->dst.info),
                        snd_ctl_elem_info_get_step(mix->dst.info));
            copy_value(&mix->dst, &mix->src);
            break;
      default:
            logit(LOG_CRIT, "Unable to handle control type %s\n", snd_ctl_elem_type_name(type));
            err = -EINVAL;
            break;
      }
      if (err < 0) {
            logit(LOG_CRIT, "Unable to create control '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
            return err;
      }
      err = snd_ctl_elem_unlock(loop->capt->ctl, mix->dst.id);
      if (err < 0) {
            logit(LOG_CRIT, "Unable to unlock control info '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
            return err;
      }
      err = snd_ctl_elem_info(loop->capt->ctl, mix->dst.info);
      if (err < 0) {
            logit(LOG_CRIT, "Unable to read control info '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
            return err;
      }
      if (snd_ctl_elem_info_is_tlv_writable(mix->dst.info)) {
            unsigned int tlv[64];
            err = snd_ctl_elem_tlv_read(loop->play->ctl,
                                  mix->src.id,
                                  tlv, sizeof(tlv));
            if (err < 0) {
                  logit(LOG_CRIT, "Unable to read TLV for '%s': %s\n", id_str(mix->src.id), snd_strerror(err));
                  tlv[0] = tlv[1] = 0;
            }
            err = snd_ctl_elem_tlv_write(loop->capt->ctl,
                                   mix->dst.id,
                                   tlv);
            if (err < 0) {
                  logit(LOG_CRIT, "Unable to write TLV for '%s': %s\n", id_str(mix->src.id), snd_strerror(err));
                  return err;
            }
      }
      err = snd_ctl_elem_write(loop->capt->ctl, mix->dst.value);
      if (err < 0) {
            logit(LOG_CRIT, "Unable to write control value '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
            return err;
      }
      return 0;
}

int control_init(struct loopback *loop)
{
      struct loopback_mixer *mix;
      struct loopback_ossmixer *ossmix;
      int err;

      for (ossmix = loop->oss_controls; ossmix; ossmix = ossmix->next)
            oss_set(loop, ossmix, 0);
      for (mix = loop->controls; mix; mix = mix->next) {
            err = control_init1(loop->play, &mix->src);
            if (err < 0) {
                  logit(LOG_WARNING, "%s: Disabling playback control '%s'\n", loop->id, id_str(mix->src.id));
                  mix->skip = 1;
                  continue;
            }
            err = control_init2(loop, mix);
            if (err < 0)
                  return err;
      }
      for (ossmix = loop->oss_controls; ossmix; ossmix = ossmix->next) {
            err = oss_set(loop, ossmix, 1);
            if (err < 0) {
                  ossmix->skip = 1;
                  logit(LOG_WARNING, "%s: Disabling OSS mixer ID '%s'\n", loop->id, ossmix->oss_id);
            }
      }
      return 0;
}

int control_done(struct loopback *loop)
{
      struct loopback_mixer *mix;
      struct loopback_ossmixer *ossmix;
      int err;

      if (loop->capt->ctl == NULL)
            return 0;
      for (ossmix = loop->oss_controls; ossmix; ossmix = ossmix->next) {
            err = oss_set(loop, ossmix, 0);
            if (err < 0)
                  logit(LOG_WARNING, "%s: Unable to remove OSS control '%s'\n", loop->id, ossmix->oss_id);
      }
      for (mix = loop->controls; mix; mix = mix->next) {
            if (mix->skip)
                  continue;
            err = snd_ctl_elem_remove(loop->capt->ctl, mix->dst.id);
            if (err < 0)
                  logit(LOG_WARNING, "%s: Unable to remove control '%s': %s\n", loop->id, id_str(mix->dst.id), snd_strerror(err));
      }
      return 0;
}

static int control_event1(struct loopback *loop,
                    struct loopback_mixer *mix,
                    snd_ctl_event_t *ev,
                    int capture)
{
      unsigned int mask = snd_ctl_event_elem_get_mask(ev);
      int err;

      if (mask == SND_CTL_EVENT_MASK_REMOVE)
            return 0;
      if ((mask & SND_CTL_EVENT_MASK_VALUE) == 0)
            return 0;
      if (!capture) {
            snd_ctl_elem_value_set_id(mix->src.value, mix->src.id);
            err = snd_ctl_elem_read(loop->play->ctl, mix->src.value);
            if (err < 0) {
                  logit(LOG_CRIT, "Unable to read control value (event1) '%s': %s\n", id_str(mix->src.id), snd_strerror(err));
                  return err;
            }
            copy_value(&mix->dst, &mix->src);
            err = snd_ctl_elem_write(loop->capt->ctl, mix->dst.value);
            if (err < 0) {
                  logit(LOG_CRIT, "Unable to write control value (event1) '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
                  return err;
            }
      } else {
            err = snd_ctl_elem_read(loop->capt->ctl, mix->dst.value);
            if (err < 0) {
                  logit(LOG_CRIT, "Unable to read control value (event2) '%s': %s\n", id_str(mix->dst.id), snd_strerror(err));
                  return err;
            }
            copy_value(&mix->src, &mix->dst);
            err = snd_ctl_elem_write(loop->play->ctl, mix->src.value);
            if (err < 0) {
                  logit(LOG_CRIT, "Unable to write control value (event2) '%s': %s\n", id_str(mix->src.id), snd_strerror(err));
                  return err;
            }
      }
      return 0;
}

int control_event(struct loopback_handle *lhandle, snd_ctl_event_t *ev)
{
      snd_ctl_elem_id_t *id2;
      struct loopback_mixer *mix;
      int capt = lhandle == lhandle->loopback->capt;
      int err;

      snd_ctl_elem_id_alloca(&id2);
      snd_ctl_event_elem_get_id(ev, id2);
      for (mix = lhandle->loopback->controls; mix; mix = mix->next) {
            if (mix->skip)
                  continue;
            if (control_id_match(id2, capt ? mix->dst.id : mix->src.id)) {
                  err = control_event1(lhandle->loopback, mix, ev, capt);
                  if (err < 0)
                        return err;
            }
      }
      return 0;
}

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