150 lines
4.2 KiB
C
150 lines
4.2 KiB
C
/* snd_utils.c
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**
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** Copyright (c) 2019, The Linux Foundation. All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above
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** copyright notice, this list of conditions and the following
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** disclaimer in the documentation and/or other materials provided
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** with the distribution.
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** * Neither the name of The Linux Foundation nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "snd_utils.h"
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#define SND_DLSYM(h, p, s, err) \
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do { \
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err = 0; \
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p = dlsym(h, s); \
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if (!p) \
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err = -ENODEV; \
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} while(0)
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int snd_utils_get_int(struct snd_node *node, const char *prop, int *val)
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{
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if (!node || !node->card_node || !node->dev_node)
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return SND_NODE_TYPE_HW;
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return node->get_int(node->dev_node, prop, val);
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}
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int snd_utils_get_str(struct snd_node *node, const char *prop, char **val)
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{
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if (!node || !node->card_node || !node->dev_node)
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return SND_NODE_TYPE_HW;
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return node->get_str(node->dev_node, prop, val);
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}
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void snd_utils_put_dev_node(struct snd_node *node)
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{
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if (!node)
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return;
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if (node->card_node)
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node->put_card(node->card_node);
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if (node->dl_hdl)
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dlclose(node->dl_hdl);
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free(node);
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}
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enum snd_node_type snd_utils_get_node_type(struct snd_node *node)
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{
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int val = SND_NODE_TYPE_HW;
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if (!node || !node->card_node || !node->dev_node)
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return SND_NODE_TYPE_HW;
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node->get_int(node->dev_node, "type", &val);
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return val;
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};
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static int snd_utils_resolve_symbols(struct snd_node *node)
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{
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void *dl = node->dl_hdl;
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int err;
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SND_DLSYM(dl, node->get_card, "snd_card_def_get_card", err);
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if (err)
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goto done;
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SND_DLSYM(dl, node->put_card, "snd_card_def_put_card", err);
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if (err)
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goto done;
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SND_DLSYM(dl, node->get_node, "snd_card_def_get_node", err);
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if (err)
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goto done;
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SND_DLSYM(dl, node->get_int, "snd_card_def_get_int", err);
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if (err)
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goto done;
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SND_DLSYM(dl, node->get_str, "snd_card_def_get_str", err);
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done:
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return err;
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}
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struct snd_node *snd_utils_get_dev_node(unsigned int card,
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unsigned int device, int dev_type)
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{
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struct snd_node *node;
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int rc = 0;
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node = calloc(1, sizeof(*node));
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if (!node)
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return NULL;
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node->dl_hdl = dlopen("libsndcardparser.so", RTLD_NOW);
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if (!node->dl_hdl) {
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goto err_dl_open;
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}
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rc = snd_utils_resolve_symbols(node);
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if (rc < 0)
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goto err_resolve_symbols;
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node->card_node = node->get_card(card);
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if (!node->card_node)
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goto err_resolve_symbols;
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node->dev_node = node->get_node(node->card_node,
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device, dev_type);
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if (!node->dev_node)
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goto err_get_node;
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return node;
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err_get_node:
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node->put_card(node->card_node);
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err_resolve_symbols:
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dlclose(node->dl_hdl);
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err_dl_open:
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free(node);
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return NULL;
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}
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