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alisp_snd.c

/*
 *  ALSA lisp implementation - sound related commands
 *  Copyright (c) 2003 by Jaroslav Kysela <perex@suse.cz>
 *
 *
 *   This library 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 library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

00022 struct acall_table {
      const char *name;
      struct alisp_object * (*func) (struct alisp_instance *instance, struct acall_table * item, struct alisp_object * args);
      void * xfunc;
      const char *prefix;
};

/*
 *  helper functions
 */

static inline int get_integer(struct alisp_object * obj)
{
      if (alisp_compare_type(obj, ALISP_OBJ_INTEGER))
            return obj->value.i;
      return 0;
}

static inline const void *get_pointer(struct alisp_object * obj)
{
      if (alisp_compare_type(obj, ALISP_OBJ_POINTER))
            return obj->value.ptr;
      return NULL;
}

static const char *get_string(struct alisp_object * obj, const char * deflt)
{
      if (obj == &alsa_lisp_t)
            return "true";
      if (alisp_compare_type(obj, ALISP_OBJ_STRING) ||
          alisp_compare_type(obj, ALISP_OBJ_IDENTIFIER))
            return obj->value.s;
      return deflt;
}

00057 struct flags {
      const char *key;
      unsigned int mask;
}; 

static unsigned int get_flags(struct alisp_instance * instance,
                        struct alisp_object * obj,
                        const struct flags * flags,
                        unsigned int deflt)
{
      const char *key;
      int invert;
      unsigned int result;
      const struct flags *ptr;
      struct alisp_object *n;

      if (obj == &alsa_lisp_nil)
            return deflt;
      result = deflt;
      do {
            key = get_string(obj, NULL);
            if (key) {
                  invert = key[0] == '!';
                  key += invert;
                  ptr = flags;
                  while (ptr->key) {
                        if (!strcmp(ptr->key, key)) {
                              if (invert)
                                    result &= ~ptr->mask;
                              else
                                    result |= ptr->mask;
                              break;
                        }
                        ptr++;
                  }
            }
            delete_tree(instance, car(obj));
            obj = cdr(n = obj);
            delete_object(instance, n);
      } while (obj != &alsa_lisp_nil);
      return result;
}

static const void *get_ptr(struct alisp_instance * instance,
                     struct alisp_object * obj,
                     const char *_ptr_id)
{
      const char *ptr_id;
      const void *ptr;
      
      ptr_id = get_string(car(obj), NULL);
      if (ptr_id == NULL) {
            delete_tree(instance, obj);
            return NULL;
      }
      if (strcmp(ptr_id, _ptr_id)) {
            delete_tree(instance, obj);
            return NULL;
      }
      ptr = get_pointer(cdr(obj));
      delete_tree(instance, obj);
      return ptr;
}

static struct alisp_object * new_lexpr(struct alisp_instance * instance, int err)
{
      struct alisp_object * lexpr;

      lexpr = new_object(instance, ALISP_OBJ_CONS);
      if (lexpr == NULL)
            return NULL;
      lexpr->value.c.car = new_integer(instance, err);
      if (lexpr->value.c.car == NULL) {
            delete_object(instance, lexpr);
            return NULL;
      }
      lexpr->value.c.cdr = new_object(instance, ALISP_OBJ_CONS);
      if (lexpr->value.c.cdr == NULL) {
            delete_object(instance, lexpr->value.c.car);
            delete_object(instance, lexpr);
            return NULL;
      }
      return lexpr;
}

static struct alisp_object * add_cons(struct alisp_instance * instance,
                              struct alisp_object *lexpr,
                              int cdr, const char *id,
                              struct alisp_object *obj)
{
      struct alisp_object * p1, * p2;

      if (lexpr == NULL || obj == NULL) {
            delete_tree(instance, obj);
            return NULL;
      }
      if (cdr) {
            p1 = lexpr->value.c.cdr = new_object(instance, ALISP_OBJ_CONS);
      } else {
            p1 = lexpr->value.c.car = new_object(instance, ALISP_OBJ_CONS);
      }
      lexpr = p1;
      if (p1 == NULL) {
            delete_tree(instance, obj);
            return NULL;
      }
      p1->value.c.car = new_object(instance, ALISP_OBJ_CONS);
      if ((p2 = p1->value.c.car) == NULL)
            goto __err;
      p2->value.c.car = new_string(instance, id);
      if (p2->value.c.car == NULL) {
            __err:
            if (cdr)
                  lexpr->value.c.cdr = NULL;
            else
                  lexpr->value.c.car = NULL;
            delete_tree(instance, p1);
            delete_tree(instance, obj);
            return NULL;
      }
      p2->value.c.cdr = obj;
      return lexpr;
}

static struct alisp_object * add_cons2(struct alisp_instance * instance,
                               struct alisp_object *lexpr,
                               int cdr, struct alisp_object *obj)
{
      struct alisp_object * p1;

      if (lexpr == NULL || obj == NULL) {
            delete_tree(instance, obj);
            return NULL;
      }
      if (cdr) {
            p1 = lexpr->value.c.cdr = new_object(instance, ALISP_OBJ_CONS);
      } else {
            p1 = lexpr->value.c.car = new_object(instance, ALISP_OBJ_CONS);
      }
      lexpr = p1;
      if (p1 == NULL) {
            delete_tree(instance, obj);
            return NULL;
      }
      p1->value.c.car = obj;
      return lexpr;
}

static struct alisp_object * new_result1(struct alisp_instance * instance,
                               int err, const char *ptr_id, void *ptr)
{
      struct alisp_object * lexpr, * p1;

      if (err < 0)
            ptr = NULL;
      lexpr = new_object(instance, ALISP_OBJ_CONS);
      if (lexpr == NULL)
            return NULL;
      lexpr->value.c.car = new_integer(instance, err);
      if (lexpr->value.c.car == NULL) {
            delete_object(instance, lexpr);
            return NULL;
      }
      p1 = add_cons(instance, lexpr, 1, ptr_id, new_pointer(instance, ptr));
      if (p1 == NULL) {
            delete_object(instance, lexpr);
            return NULL;
      }
      return lexpr;
}

static struct alisp_object * new_result2(struct alisp_instance * instance,
                               int err, int val)
{
      struct alisp_object * lexpr, * p1;

      if (err < 0)
            val = 0;
      lexpr = new_lexpr(instance, err);
      if (lexpr == NULL)
            return NULL;
      p1 = lexpr->value.c.cdr;
      p1->value.c.car = new_integer(instance, val);
      if (p1->value.c.car == NULL) {
            delete_object(instance, lexpr);
            return NULL;
      }
      return lexpr;
}

static struct alisp_object * new_result3(struct alisp_instance * instance,
                               int err, const char *str)
{
      struct alisp_object * lexpr, * p1;

      if (err < 0)
            str = "";
      lexpr = new_lexpr(instance, err);
      if (lexpr == NULL)
            return NULL;
      p1 = lexpr->value.c.cdr;
      p1->value.c.car = new_string(instance, str);
      if (p1->value.c.car == NULL) {
            delete_object(instance, lexpr);
            return NULL;
      }
      return lexpr;
}

/*
 *  macros
 */

/*
 *  HCTL functions
 */

typedef int (*snd_int_pp_strp_int_t)(void **rctl, const char *name, int mode);
typedef int (*snd_int_pp_p_t)(void **rctl, void *handle);
typedef int (*snd_int_p_t)(void *rctl);
typedef char * (*snd_str_p_t)(void *rctl);
typedef int (*snd_int_intp_t)(int *val);
typedef int (*snd_int_str_t)(const char *str);
typedef int (*snd_int_int_strp_t)(int val, char **str);
typedef void *(*snd_p_p_t)(void *handle);

static struct alisp_object * FA_int_pp_strp_int(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      const char *name;
      int err, mode;
      void *handle;
      struct alisp_object *p1, *p2;
      static struct flags flags[] = {
            { "nonblock", SND_CTL_NONBLOCK },
            { "async", SND_CTL_ASYNC },
            { "readonly", SND_CTL_READONLY },
            { NULL, 0 }
      };

      name = get_string(p1 = eval(instance, car(args)), NULL);
      if (name == NULL)
            return &alsa_lisp_nil;
      mode = get_flags(instance, p2 = eval(instance, car(cdr(args))), flags, 0);
      delete_tree(instance, cdr(cdr(args)));
      delete_object(instance, cdr(args));
      delete_object(instance, args);
      delete_tree(instance, p2);
      err = ((snd_int_pp_strp_int_t)item->xfunc)(&handle, name, mode);
      delete_tree(instance, p1);
      return new_result1(instance, err, item->prefix, handle);
}

static struct alisp_object * FA_int_pp_p(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      int err;
      void *handle;
      const char *prefix1;
      struct alisp_object *p1;

      if (item->xfunc == &snd_hctl_open_ctl)
            prefix1 = "ctl";
      else {
            delete_tree(instance, args);
            return &alsa_lisp_nil;
      }
      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      handle = (void *)get_ptr(instance, p1, prefix1);
      if (handle == NULL)
            return &alsa_lisp_nil;
      err = ((snd_int_pp_p_t)item->xfunc)(&handle, handle);
      return new_result1(instance, err, item->prefix, handle);
}

static struct alisp_object * FA_p_p(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      void *handle;
      const char *prefix1;
      struct alisp_object * p1;

      if (item->xfunc == &snd_hctl_first_elem ||
          item->xfunc == &snd_hctl_last_elem ||
          item->xfunc == &snd_hctl_elem_next ||
          item->xfunc == &snd_hctl_elem_prev)
            prefix1 = "hctl_elem";
      else if (item->xfunc == &snd_hctl_ctl)
            prefix1 = "ctl";
      else {
            delete_tree(instance, args);
            return &alsa_lisp_nil;
      }
      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      handle = (void *)get_ptr(instance, p1, item->prefix);
      if (handle == NULL)
            return &alsa_lisp_nil;
      handle = ((snd_p_p_t)item->xfunc)(handle);
      return new_cons_pointer(instance, prefix1, handle);
}

static struct alisp_object * FA_int_p(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      void *handle;
      struct alisp_object * p1;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      handle = (void *)get_ptr(instance, p1, item->prefix);
      if (handle == NULL)
            return &alsa_lisp_nil;
      return new_integer(instance, ((snd_int_p_t)item->xfunc)(handle));
}

static struct alisp_object * FA_str_p(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      void *handle;
      struct alisp_object * p1;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      handle = (void *)get_ptr(instance, p1, item->prefix);
      if (handle == NULL)
            return &alsa_lisp_nil;
      return new_string(instance, ((snd_str_p_t)item->xfunc)(handle));
}

static struct alisp_object * FA_int_intp(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      int val, err;
      struct alisp_object * p1;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      if (!alisp_compare_type(p1, ALISP_OBJ_INTEGER)) {
            delete_tree(instance, p1);
            return &alsa_lisp_nil;
      }
      val = p1->value.i;
      delete_tree(instance, p1);
      err = ((snd_int_intp_t)item->xfunc)(&val);
      return new_result2(instance, err, val);
}

static struct alisp_object * FA_int_str(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      int err;
      struct alisp_object * p1;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      if (!alisp_compare_type(p1, ALISP_OBJ_STRING) &&
          !alisp_compare_type(p1, ALISP_OBJ_IDENTIFIER)) {
            delete_tree(instance, p1);
            return &alsa_lisp_nil;
      }
      err = ((snd_int_str_t)item->xfunc)(p1->value.s);
      delete_tree(instance, p1);
      return new_integer(instance, err);
}

static struct alisp_object * FA_int_int_strp(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      int err;
      char *str;
      long val;
      struct alisp_object * p1;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      if (!alisp_compare_type(p1, ALISP_OBJ_INTEGER)) {
            delete_tree(instance, p1);
            return &alsa_lisp_nil;
      }
      val = p1->value.i;
      delete_tree(instance, p1);
      err = ((snd_int_int_strp_t)item->xfunc)(val, &str);
      return new_result3(instance, err, str);
}

static struct alisp_object * FA_card_info(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      snd_ctl_t *handle;
      struct alisp_object * lexpr, * p1;
      snd_ctl_card_info_t * info;
      int err;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      handle = (snd_ctl_t *)get_ptr(instance, p1, item->prefix);
      if (handle == NULL)
            return &alsa_lisp_nil;
      snd_ctl_card_info_alloca(&info);
      err = snd_ctl_card_info(handle, info);
      lexpr = new_lexpr(instance, err);
      if (err < 0)
            return lexpr;
      p1 = add_cons(instance, lexpr->value.c.cdr, 0, "id", new_string(instance, snd_ctl_card_info_get_id(info)));
      p1 = add_cons(instance, p1, 1, "driver", new_string(instance, snd_ctl_card_info_get_driver(info)));
      p1 = add_cons(instance, p1, 1, "name", new_string(instance, snd_ctl_card_info_get_name(info)));
      p1 = add_cons(instance, p1, 1, "longname", new_string(instance, snd_ctl_card_info_get_longname(info)));
      p1 = add_cons(instance, p1, 1, "mixername", new_string(instance, snd_ctl_card_info_get_mixername(info)));
      p1 = add_cons(instance, p1, 1, "components", new_string(instance, snd_ctl_card_info_get_components(info)));
      if (p1 == NULL) {
            delete_tree(instance, lexpr);
            return NULL;
      }
      return lexpr;
}

static struct alisp_object * create_ctl_elem_id(struct alisp_instance * instance, snd_ctl_elem_id_t * id, struct alisp_object * cons)
{
      cons = add_cons(instance, cons, 0, "numid", new_integer(instance, snd_ctl_elem_id_get_numid(id)));
      cons = add_cons(instance, cons, 1, "iface", new_string(instance, snd_ctl_elem_iface_name(snd_ctl_elem_id_get_interface(id))));
      cons = add_cons(instance, cons, 1, "dev", new_integer(instance, snd_ctl_elem_id_get_device(id)));
      cons = add_cons(instance, cons, 1, "subdev", new_integer(instance, snd_ctl_elem_id_get_subdevice(id)));
      cons = add_cons(instance, cons, 1, "name", new_string(instance, snd_ctl_elem_id_get_name(id)));
      cons = add_cons(instance, cons, 1, "index", new_integer(instance, snd_ctl_elem_id_get_index(id)));
      return cons;
}

static int parse_ctl_elem_id(struct alisp_instance * instance,
                       struct alisp_object * cons,
                       snd_ctl_elem_id_t * id)
{
      struct alisp_object *p1;
      const char *xid;

      if (cons == NULL)
            return -ENOMEM;
      snd_ctl_elem_id_clear(id);
      id->numid = 0;
      do {
            p1 = car(cons);
            if (alisp_compare_type(p1, ALISP_OBJ_CONS)) {
                  xid = get_string(p1->value.c.car, NULL);
                  if (xid == NULL) {
                        /* noop */
                  } else if (!strcmp(xid, "numid")) {
                        snd_ctl_elem_id_set_numid(id, get_integer(p1->value.c.cdr));
                  } else if (!strcmp(xid, "iface")) {
                        snd_ctl_elem_id_set_interface(id, snd_config_get_ctl_iface_ascii(get_string(p1->value.c.cdr, "0")));
                  } else if (!strcmp(xid, "dev")) {
                        snd_ctl_elem_id_set_device(id, get_integer(p1->value.c.cdr));
                  } else if (!strcmp(xid, "subdev")) {
                        snd_ctl_elem_id_set_subdevice(id, get_integer(p1->value.c.cdr));
                  } else if (!strcmp(xid, "name")) {
                        snd_ctl_elem_id_set_name(id, get_string(p1->value.c.cdr, "?"));
                  } else if (!strcmp(xid, "index")) {
                        snd_ctl_elem_id_set_index(id, get_integer(p1->value.c.cdr));
                  }
            }
            delete_tree(instance, p1);
              cons = cdr(p1 = cons);
              delete_object(instance, p1);
      } while (cons != &alsa_lisp_nil);
      return 0;
}

static struct alisp_object * FA_hctl_find_elem(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      snd_hctl_t *handle;
      snd_ctl_elem_id_t *id;
      struct alisp_object *p1;

      handle = (snd_hctl_t *)get_ptr(instance, car(args), item->prefix);
      if (handle == NULL) {
            delete_tree(instance, cdr(args));
            delete_object(instance, args);
            return &alsa_lisp_nil;
      }
      snd_ctl_elem_id_alloca(&id);
      p1 = car(cdr(args));
      delete_tree(instance, cdr(cdr(args)));
      delete_object(instance, cdr(args));
      delete_object(instance, args);
      if (parse_ctl_elem_id(instance, eval(instance, p1), id) < 0)
            return &alsa_lisp_nil;
      return new_cons_pointer(instance, "hctl_elem", snd_hctl_find_elem(handle, id));
}

static struct alisp_object * FA_hctl_elem_info(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      snd_hctl_elem_t *handle;
      struct alisp_object * lexpr, * p1, * p2;
      snd_ctl_elem_info_t *info;
      snd_ctl_elem_id_t *id;
      snd_ctl_elem_type_t type;
      int err;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      handle = (snd_hctl_elem_t *)get_ptr(instance, p1, item->prefix);
      if (handle == NULL)
            return &alsa_lisp_nil;
      snd_ctl_elem_info_alloca(&info);
      snd_ctl_elem_id_alloca(&id);
      err = snd_hctl_elem_info(handle, info);
      lexpr = new_lexpr(instance, err);
      if (err < 0)
            return lexpr;
      type = snd_ctl_elem_info_get_type(info);
      p1 = add_cons(instance, lexpr->value.c.cdr, 0, "id", p2 = new_object(instance, ALISP_OBJ_CONS));
      snd_ctl_elem_info_get_id(info, id);
      if (create_ctl_elem_id(instance, id, p2) == NULL) {
            delete_tree(instance, lexpr);
            return NULL;
      }
      p1 = add_cons(instance, p1, 1, "type", new_string(instance, snd_ctl_elem_type_name(type)));
      p1 = add_cons(instance, p1, 1, "readable", new_integer(instance, snd_ctl_elem_info_is_readable(info)));
      p1 = add_cons(instance, p1, 1, "writeable", new_integer(instance, snd_ctl_elem_info_is_writable(info)));
      p1 = add_cons(instance, p1, 1, "volatile", new_integer(instance, snd_ctl_elem_info_is_volatile(info)));
      p1 = add_cons(instance, p1, 1, "inactive", new_integer(instance, snd_ctl_elem_info_is_inactive(info)));
      p1 = add_cons(instance, p1, 1, "locked", new_integer(instance, snd_ctl_elem_info_is_locked(info)));
      p1 = add_cons(instance, p1, 1, "isowner", new_integer(instance, snd_ctl_elem_info_is_owner(info)));
      p1 = add_cons(instance, p1, 1, "owner", new_integer(instance, snd_ctl_elem_info_get_owner(info)));
      p1 = add_cons(instance, p1, 1, "count", new_integer(instance, snd_ctl_elem_info_get_count(info)));
      err = snd_ctl_elem_info_get_dimensions(info);
      if (err > 0) {
            int idx;
            p1 = add_cons(instance, p1, 1, "dimensions", p2 = new_object(instance, ALISP_OBJ_CONS));
            for (idx = 0; idx < err; idx++)
                  p2 = add_cons2(instance, p2, idx > 0, new_integer(instance, snd_ctl_elem_info_get_dimension(info, idx)));
      }
      switch (type) {
      case SND_CTL_ELEM_TYPE_ENUMERATED: {
            unsigned int items, item;
            items = snd_ctl_elem_info_get_items(info);
            p1 = add_cons(instance, p1, 1, "items", p2 = new_object(instance, ALISP_OBJ_CONS));
            for (item = 0; item < items; item++) {
                  snd_ctl_elem_info_set_item(info, item);
                  err = snd_hctl_elem_info(handle, info);
                  if (err < 0) {
                        p2 = add_cons2(instance, p2, item, &alsa_lisp_nil);
                  } else {
                        p2 = add_cons2(instance, p2, item, new_string(instance, snd_ctl_elem_info_get_item_name(info)));
                  }
            }
            break;
      }
      case SND_CTL_ELEM_TYPE_INTEGER:
            p1 = add_cons(instance, p1, 1, "min", new_integer(instance, snd_ctl_elem_info_get_min(info)));
            p1 = add_cons(instance, p1, 1, "max", new_integer(instance, snd_ctl_elem_info_get_max(info)));
            p1 = add_cons(instance, p1, 1, "step", new_integer(instance, snd_ctl_elem_info_get_step(info)));
            break;
      case SND_CTL_ELEM_TYPE_INTEGER64:
            p1 = add_cons(instance, p1, 1, "min64", new_float(instance, snd_ctl_elem_info_get_min64(info)));
            p1 = add_cons(instance, p1, 1, "max64", new_float(instance, snd_ctl_elem_info_get_max64(info)));
            p1 = add_cons(instance, p1, 1, "step64", new_float(instance, snd_ctl_elem_info_get_step64(info)));
            break;
      default:
            break;
      }
      if (p1 == NULL) {
            delete_tree(instance, lexpr);
            return NULL;
      }
      return lexpr;
}

static struct alisp_object * FA_hctl_elem_read(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      snd_hctl_elem_t *handle;
      struct alisp_object * lexpr, * p1 = NULL, * obj;
      snd_ctl_elem_info_t *info;
      snd_ctl_elem_value_t *value;
      snd_ctl_elem_type_t type;
      unsigned int idx, count;
      int err;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      handle = (snd_hctl_elem_t *)get_ptr(instance, p1, item->prefix);
      if (handle == NULL)
            return &alsa_lisp_nil;
      snd_ctl_elem_info_alloca(&info);
      snd_ctl_elem_value_alloca(&value);
      err = snd_hctl_elem_info(handle, info);
      if (err >= 0)
            err = snd_hctl_elem_read(handle, value);
      lexpr = new_lexpr(instance, err);
      if (err < 0)
            return lexpr;
      type = snd_ctl_elem_info_get_type(info);
      count = snd_ctl_elem_info_get_count(info);
      if (type == SND_CTL_ELEM_TYPE_IEC958) {
            count = sizeof(snd_aes_iec958_t);
            type = SND_CTL_ELEM_TYPE_BYTES;
      }
      for (idx = 0; idx < count; idx++) {
            switch (type) {
            case SND_CTL_ELEM_TYPE_BOOLEAN:
                  obj = new_integer(instance, snd_ctl_elem_value_get_boolean(value, idx));
                  break;
            case SND_CTL_ELEM_TYPE_INTEGER:
                  obj = new_integer(instance, snd_ctl_elem_value_get_integer(value, idx));
                  break;
            case SND_CTL_ELEM_TYPE_INTEGER64:
                  obj = new_integer(instance, snd_ctl_elem_value_get_integer64(value, idx));
                  break;
            case SND_CTL_ELEM_TYPE_ENUMERATED:
                  obj = new_integer(instance, snd_ctl_elem_value_get_enumerated(value, idx));
                  break;
            case SND_CTL_ELEM_TYPE_BYTES:
                  obj = new_integer(instance, snd_ctl_elem_value_get_byte(value, idx));
                  break;
            default:
                  obj = NULL;
                  break;
            }
            if (idx == 0) {
                  p1 = add_cons2(instance, lexpr->value.c.cdr, 0, obj);
            } else {
                  p1 = add_cons2(instance, p1, 1, obj);
            }
      }
      if (p1 == NULL) {
            delete_tree(instance, lexpr);
            return &alsa_lisp_nil;
      }
      return lexpr;
}

static struct alisp_object * FA_hctl_elem_write(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      snd_hctl_elem_t *handle;
      struct alisp_object * p1 = NULL, * obj;
      snd_ctl_elem_info_t *info;
      snd_ctl_elem_value_t *value;
      snd_ctl_elem_type_t type;
      unsigned int idx, count;
      int err;

      p1 = car(cdr(args));
      obj = eval(instance, car(args));
      delete_tree(instance, cdr(cdr(args)));
      delete_object(instance, cdr(args));
      delete_object(instance, args);
      handle = (snd_hctl_elem_t *)get_ptr(instance, obj, item->prefix);
      if (handle == NULL) {
            delete_tree(instance, p1);
            return &alsa_lisp_nil;
      }
      snd_ctl_elem_info_alloca(&info);
      snd_ctl_elem_value_alloca(&value);
      err = snd_hctl_elem_info(handle, info);
      if (err < 0) {
            delete_tree(instance, p1);
            return new_integer(instance, err);
      }
      type = snd_ctl_elem_info_get_type(info);
      count = snd_ctl_elem_info_get_count(info);
      if (type == SND_CTL_ELEM_TYPE_IEC958) {
            count = sizeof(snd_aes_iec958_t);
            type = SND_CTL_ELEM_TYPE_BYTES;
      }
      idx = -1;
      do {
            if (++idx >= count) {
                  delete_tree(instance, p1);
                  break;
            }
            obj = car(p1);
            switch (type) {
            case SND_CTL_ELEM_TYPE_BOOLEAN:
                  snd_ctl_elem_value_set_boolean(value, idx, get_integer(obj));
                  break;
            case SND_CTL_ELEM_TYPE_INTEGER:
                  snd_ctl_elem_value_set_integer(value, idx, get_integer(obj));
                  break;
            case SND_CTL_ELEM_TYPE_INTEGER64:
                  snd_ctl_elem_value_set_integer64(value, idx, get_integer(obj));
                  break;
            case SND_CTL_ELEM_TYPE_ENUMERATED:
                  snd_ctl_elem_value_set_enumerated(value, idx, get_integer(obj));
                  break;
            case SND_CTL_ELEM_TYPE_BYTES:
                  snd_ctl_elem_value_set_byte(value, idx, get_integer(obj));
                  break;
            default:
                  break;
            }
            delete_tree(instance, obj);
            p1 = cdr(obj = p1);
            delete_object(instance, obj);
      } while (p1 != &alsa_lisp_nil);
      err = snd_hctl_elem_write(handle, value);
      return new_integer(instance, err);
}

static struct alisp_object * FA_pcm_info(struct alisp_instance * instance, struct acall_table * item, struct alisp_object * args)
{
      snd_pcm_t *handle;
      struct alisp_object * lexpr, * p1;
      snd_pcm_info_t *info;
      int err;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      handle = (snd_pcm_t *)get_ptr(instance, p1, item->prefix);
      if (handle == NULL)
            return &alsa_lisp_nil;
      snd_pcm_info_alloca(&info);
      err = snd_pcm_info(handle, info);
      lexpr = new_lexpr(instance, err);
      if (err < 0)
            return lexpr;
      p1 = add_cons(instance, lexpr->value.c.cdr, 0, "card", new_integer(instance, snd_pcm_info_get_card(info)));
      p1 = add_cons(instance, p1, 1, "device", new_integer(instance, snd_pcm_info_get_device(info)));
      p1 = add_cons(instance, p1, 1, "subdevice", new_integer(instance, snd_pcm_info_get_subdevice(info)));
      p1 = add_cons(instance, p1, 1, "id", new_string(instance, snd_pcm_info_get_id(info)));
      p1 = add_cons(instance, p1, 1, "name", new_string(instance, snd_pcm_info_get_name(info)));
      p1 = add_cons(instance, p1, 1, "subdevice_name", new_string(instance, snd_pcm_info_get_subdevice_name(info)));
      p1 = add_cons(instance, p1, 1, "class", new_integer(instance, snd_pcm_info_get_class(info)));
      p1 = add_cons(instance, p1, 1, "subclass", new_integer(instance, snd_pcm_info_get_subclass(info)));
      p1 = add_cons(instance, p1, 1, "subdevices_count", new_integer(instance, snd_pcm_info_get_subdevices_count(info)));
      p1 = add_cons(instance, p1, 1, "subdevices_avail", new_integer(instance, snd_pcm_info_get_subdevices_avail(info)));
      //p1 = add_cons(instance, p1, 1, "sync", new_string(instance, snd_pcm_info_get_sync(info)));
      return lexpr;
}

/*
 *  main code
 */

static struct acall_table acall_table[] = {
      { "card_get_index", &FA_int_str, (void *)snd_card_get_index, NULL },
      { "card_get_longname", &FA_int_int_strp, (void *)snd_card_get_longname, NULL },
      { "card_get_name", &FA_int_int_strp, (void *)snd_card_get_name, NULL },
      { "card_next", &FA_int_intp, (void *)&snd_card_next, NULL },
      { "ctl_card_info", &FA_card_info, NULL, "ctl" },
      { "ctl_close", &FA_int_p, (void *)&snd_ctl_close, "ctl" },
      { "ctl_open", &FA_int_pp_strp_int, (void *)&snd_ctl_open, "ctl" },
      { "hctl_close", &FA_int_p, (void *)&snd_hctl_close, "hctl" },
      { "hctl_ctl", &FA_p_p, (void *)&snd_hctl_ctl, "hctl" },
      { "hctl_elem_info", &FA_hctl_elem_info, (void *)&snd_hctl_elem_info, "hctl_elem" },
      { "hctl_elem_next", &FA_p_p, (void *)&snd_hctl_elem_next, "hctl_elem" },
      { "hctl_elem_prev", &FA_p_p, (void *)&snd_hctl_elem_prev, "hctl_elem" },
      { "hctl_elem_read", &FA_hctl_elem_read, (void *)&snd_hctl_elem_read, "hctl_elem" },
      { "hctl_elem_write", &FA_hctl_elem_write, (void *)&snd_hctl_elem_write, "hctl_elem" },
      { "hctl_find_elem", &FA_hctl_find_elem, (void *)&snd_hctl_find_elem, "hctl" },
      { "hctl_first_elem", &FA_p_p, (void *)&snd_hctl_first_elem, "hctl" },
      { "hctl_free", &FA_int_p, (void *)&snd_hctl_free, "hctl" },
      { "hctl_last_elem", &FA_p_p, (void *)&snd_hctl_last_elem, "hctl" },
      { "hctl_load", &FA_int_p, (void *)&snd_hctl_load, "hctl" },
      { "hctl_open", &FA_int_pp_strp_int, (void *)&snd_hctl_open, "hctl" },
      { "hctl_open_ctl", &FA_int_pp_p, (void *)&snd_hctl_open_ctl, "hctl" },
      { "pcm_info", &FA_pcm_info, NULL, "pcm" },
      { "pcm_name", &FA_str_p, (void *)&snd_pcm_name, "pcm" },
};

static int acall_compar(const void *p1, const void *p2)
{
      return strcmp(((struct acall_table *)p1)->name,
                  ((struct acall_table *)p2)->name);
}

static struct alisp_object * F_acall(struct alisp_instance *instance, struct alisp_object * args)
{
      struct alisp_object * p1, *p2;
      struct acall_table key, *item;

      p1 = eval(instance, car(args));
      p2 = cdr(args);
      delete_object(instance, args);
      if (!alisp_compare_type(p1, ALISP_OBJ_IDENTIFIER) &&
          !alisp_compare_type(p1, ALISP_OBJ_STRING)) {
            delete_tree(instance, p2);
            return &alsa_lisp_nil;
      }
      key.name = p1->value.s;
      if ((item = bsearch(&key, acall_table,
                      sizeof acall_table / sizeof acall_table[0],
                      sizeof acall_table[0], acall_compar)) != NULL) {
            delete_tree(instance, p1);
            return item->func(instance, item, p2);
      }
      delete_tree(instance, p1);
      delete_tree(instance, p2);
      lisp_warn(instance, "acall function %s' is undefined", p1->value.s);
      return &alsa_lisp_nil;
}

static struct alisp_object * F_ahandle(struct alisp_instance *instance, struct alisp_object * args)
{
      struct alisp_object *p1;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      args = car(cdr(p1));
      delete_tree(instance, cdr(cdr(p1)));
      delete_object(instance, cdr(p1));
      delete_tree(instance, car(p1));
      delete_object(instance, p1);
      return args;
}

static struct alisp_object * F_aerror(struct alisp_instance *instance, struct alisp_object * args)
{
      struct alisp_object *p1;

      p1 = eval(instance, car(args));
      delete_tree(instance, cdr(args));
      delete_object(instance, args);
      args = car(p1);
      if (args == &alsa_lisp_nil) {
            delete_tree(instance, p1);
            return new_integer(instance, SND_ERROR_ALISP_NIL);
      } else {
            delete_tree(instance, cdr(p1));
            delete_object(instance, p1);
      }
      return args;
}

static int common_error(snd_output_t **rout, struct alisp_instance *instance, struct alisp_object * args)
{
      struct alisp_object * p = args, * p1;
      snd_output_t *out;
      int err;
      
      err = snd_output_buffer_open(&out);
      if (err < 0) {
            delete_tree(instance, args);
            return err;
      }

      do {
            p1 = eval(instance, car(p));
            if (alisp_compare_type(p1, ALISP_OBJ_STRING))
                  snd_output_printf(out, "%s", p1->value.s);
            else
                  princ_object(out, p1);
            delete_tree(instance, p1);
            p = cdr(p1 = p);
            delete_object(instance, p1);
      } while (p != &alsa_lisp_nil);

      *rout = out;
      return 0;
}

static struct alisp_object * F_snderr(struct alisp_instance *instance, struct alisp_object * args)
{
      snd_output_t *out;
      char *str;

      if (common_error(&out, instance, args) < 0)
            return &alsa_lisp_nil;
      snd_output_buffer_string(out, &str);
      SNDERR(str);
      snd_output_close(out);
      return &alsa_lisp_t;
}

static struct alisp_object * F_syserr(struct alisp_instance *instance, struct alisp_object * args)
{
      snd_output_t *out;
      char *str;

      if (common_error(&out, instance, args) < 0)
            return &alsa_lisp_nil;
      snd_output_buffer_string(out, &str);
      SYSERR(str);
      snd_output_close(out);
      return &alsa_lisp_t;
}

static struct intrinsic snd_intrinsics[] = {
      { "Acall", F_acall },
      { "Aerror", F_aerror },
      { "Ahandle", F_ahandle },
      { "Aresult", F_ahandle },
      { "Asnderr", F_snderr },
      { "Asyserr", F_syserr }
};

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