271 lines
7.4 KiB
C
271 lines
7.4 KiB
C
/* sample_sndcardparser.c
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**
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** Copyright (c) 2021, 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 <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
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#define VIRTUAL_SND_CARD_ID 100
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#define MAX_PATH 256
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#define BUF_SIZE 1024
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enum snd_node_type {
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NODE_TYPE_HW = 0,
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NODE_TYPE_PLUGIN,
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NODE_TYPE_INVALID,
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};
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enum {
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NODE_PCM,
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NODE_COMPR,
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NODE_MIXER,
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NODE_MAX,
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};
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struct snd_node_ops {
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/** Function pointer to get card definition */
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void* (*open_card)(unsigned int card);
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/** Function pointer to release card definition */
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void (*close_card)(void *card);
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/** Get interger type properties from device definition */
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int (*get_int)(void *node, const char *prop, int *val);
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/** Get string type properties from device definition */
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int (*get_str)(void *node, const char *prop, char **val);
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/** Function pointer to get mixer definition */
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void* (*get_mixer)(void *card);
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/** Function pointer to get PCM definition */
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void* (*get_pcm)(void *card, unsigned int id);
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/** Function pointer to get COMPRESS definition */
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void* (*get_compress)(void *card, unsigned int id);
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};
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struct snd_dev_def {
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unsigned int device;
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int type;
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const char *name;
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const char *so_name;
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int playback; //used only for pcm node
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int capture; //used only for pcm node
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/* add custom props here */
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};
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struct snd_dev_def_card {
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unsigned int card;
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char *name;
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/* child device details */
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int num_pcm_nodes;
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struct snd_dev_def *pcm_dev_def;
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struct snd_dev_def *mixer_dev_def;
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};
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struct snd_dev_def pcm_devs[] = {
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{100, NODE_TYPE_PLUGIN, "PCM100", "libtinyalsav2_example_plugin_pcm.so", 1, 0},
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/* Add other plugin info here */
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};
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struct snd_dev_def mixer_dev =
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{VIRTUAL_SND_CARD_ID, NODE_TYPE_PLUGIN, "virtual-snd-card", "libtinyalsav2_example_plugin_mixer.so", 0, 0};
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void *snd_card_def_open_card(unsigned int card)
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{
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struct snd_dev_def_card *card_def = NULL;
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struct snd_dev_def *pcm_dev_def = NULL;
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struct snd_dev_def *mixer_dev_def = NULL;
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int num_pcm = ARRAY_SIZE(pcm_devs);
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int i;
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if (card != VIRTUAL_SND_CARD_ID)
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return NULL;
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card_def = calloc(1, sizeof(struct snd_dev_def_card));
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if (!card_def)
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return card_def;
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card_def->card = card;
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card_def->name = strdup("virtual-snd-card");
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/* fill pcm device node info */
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card_def->num_pcm_nodes = num_pcm;
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pcm_dev_def = calloc(num_pcm, sizeof(struct snd_dev_def));
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if (!pcm_dev_def)
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goto free_card_def;
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for (i = 0; i < num_pcm; i++)
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memcpy(&pcm_dev_def[i], &pcm_devs[i], sizeof(struct snd_dev_def));
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card_def->pcm_dev_def = pcm_dev_def;
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/* fill mixer device node info */
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mixer_dev_def = calloc(1, sizeof(struct snd_dev_def));
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if (!mixer_dev_def)
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goto free_pcm_dev;
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memcpy(mixer_dev_def, &mixer_dev, sizeof(struct snd_dev_def));
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card_def->mixer_dev_def = mixer_dev_def;
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return card_def;
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free_pcm_dev:
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free(pcm_dev_def);
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free_card_def:
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free(card_def->name);
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free(card_def);
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return NULL;
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}
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void snd_card_def_close_card(void *card_node)
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{
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struct snd_dev_def_card *defs = (struct snd_dev_def_card *)card_node;
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struct snd_dev_def *pcm_dev_def = NULL;
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struct snd_dev_def *mixer_dev_def = NULL;
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if (!defs)
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return;
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pcm_dev_def = defs->pcm_dev_def;
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if (pcm_dev_def)
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free(pcm_dev_def);
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mixer_dev_def = defs->mixer_dev_def;
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if (!mixer_dev_def)
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goto free_defs;
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free(mixer_dev_def);
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free_defs:
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free(defs->name);
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free(defs);
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}
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void *snd_card_def_get_node(void *card_node, unsigned int id, int type)
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{
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struct snd_dev_def_card *card_def = (struct snd_dev_def_card *)card_node;
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struct snd_dev_def *dev_def = NULL;
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int i;
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if (!card_def)
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return NULL;
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if (type >= NODE_MAX)
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return NULL;
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if (type == NODE_MIXER)
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return card_def->mixer_dev_def;
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if (type == NODE_PCM)
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dev_def = card_def->pcm_dev_def;
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for (i = 0; i < card_def->num_pcm_nodes; i++) {
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if (dev_def[i].device == id) {
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return &dev_def[i];
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}
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}
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return NULL;
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}
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int snd_card_def_get_int(void *node, const char *prop, int *val)
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{
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struct snd_dev_def *dev_def = (struct snd_dev_def *)node;
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int ret = -EINVAL;
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if (!dev_def || !prop || !val)
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return ret;
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if (!strcmp(prop, "type")) {
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*val = dev_def->type;
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return 0;
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} else if (!strcmp(prop, "id")) {
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*val = dev_def->device;
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return 0;
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} else if (!strcmp(prop, "playback")) {
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*val = dev_def->playback;
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return 0;
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} else if (!strcmp(prop, "capture")) {
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*val = dev_def->capture;
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return 0;
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}
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return ret;
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}
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int snd_card_def_get_str(void *node, const char *prop, char **val)
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{
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struct snd_dev_def *dev_def = (struct snd_dev_def *)node;
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int ret = -EINVAL;
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if (!dev_def || !prop)
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return ret;
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if (!strcmp(prop, "so-name")) {
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if (dev_def->so_name) {
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*val = (char *)dev_def->so_name;
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return 0;
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}
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}
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if (!strcmp(prop, "name")) {
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if (dev_def->name) {
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*val = (char *)dev_def->name;
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return 0;
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}
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}
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return ret;
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}
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void *snd_card_def_get_pcm(void *card_node, unsigned int id)
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{
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return snd_card_def_get_node(card_node, id, NODE_PCM);
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}
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void *snd_card_def_get_compress(void *card_node, unsigned int id)
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{
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return snd_card_def_get_node(card_node, id, NODE_COMPR);
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}
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void *snd_card_def_get_mixer(void *card_node)
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{
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return snd_card_def_get_node(card_node, 1, NODE_MIXER);
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}
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struct snd_node_ops snd_card_ops = {
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.open_card = snd_card_def_open_card,
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.close_card = snd_card_def_close_card,
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.get_int = snd_card_def_get_int,
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.get_str = snd_card_def_get_str,
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.get_pcm = snd_card_def_get_pcm,
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.get_compress = snd_card_def_get_compress,
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.get_mixer = snd_card_def_get_mixer,
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};
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