android13/external/tinyalsa_new/examples/sndcardparser/sample_sndcardparser.c

271 lines
7.4 KiB
C

/* sample_sndcardparser.c
**
** Copyright (c) 2021, The Linux Foundation. All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above
** copyright notice, this list of conditions and the following
** disclaimer in the documentation and/or other materials provided
** with the distribution.
** * Neither the name of The Linux Foundation nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
#define VIRTUAL_SND_CARD_ID 100
#define MAX_PATH 256
#define BUF_SIZE 1024
enum snd_node_type {
NODE_TYPE_HW = 0,
NODE_TYPE_PLUGIN,
NODE_TYPE_INVALID,
};
enum {
NODE_PCM,
NODE_COMPR,
NODE_MIXER,
NODE_MAX,
};
struct snd_node_ops {
/** Function pointer to get card definition */
void* (*open_card)(unsigned int card);
/** Function pointer to release card definition */
void (*close_card)(void *card);
/** Get interger type properties from device definition */
int (*get_int)(void *node, const char *prop, int *val);
/** Get string type properties from device definition */
int (*get_str)(void *node, const char *prop, char **val);
/** Function pointer to get mixer definition */
void* (*get_mixer)(void *card);
/** Function pointer to get PCM definition */
void* (*get_pcm)(void *card, unsigned int id);
/** Function pointer to get COMPRESS definition */
void* (*get_compress)(void *card, unsigned int id);
};
struct snd_dev_def {
unsigned int device;
int type;
const char *name;
const char *so_name;
int playback; //used only for pcm node
int capture; //used only for pcm node
/* add custom props here */
};
struct snd_dev_def_card {
unsigned int card;
char *name;
/* child device details */
int num_pcm_nodes;
struct snd_dev_def *pcm_dev_def;
struct snd_dev_def *mixer_dev_def;
};
struct snd_dev_def pcm_devs[] = {
{100, NODE_TYPE_PLUGIN, "PCM100", "libtinyalsav2_example_plugin_pcm.so", 1, 0},
/* Add other plugin info here */
};
struct snd_dev_def mixer_dev =
{VIRTUAL_SND_CARD_ID, NODE_TYPE_PLUGIN, "virtual-snd-card", "libtinyalsav2_example_plugin_mixer.so", 0, 0};
void *snd_card_def_open_card(unsigned int card)
{
struct snd_dev_def_card *card_def = NULL;
struct snd_dev_def *pcm_dev_def = NULL;
struct snd_dev_def *mixer_dev_def = NULL;
int num_pcm = ARRAY_SIZE(pcm_devs);
int i;
if (card != VIRTUAL_SND_CARD_ID)
return NULL;
card_def = calloc(1, sizeof(struct snd_dev_def_card));
if (!card_def)
return card_def;
card_def->card = card;
card_def->name = strdup("virtual-snd-card");
/* fill pcm device node info */
card_def->num_pcm_nodes = num_pcm;
pcm_dev_def = calloc(num_pcm, sizeof(struct snd_dev_def));
if (!pcm_dev_def)
goto free_card_def;
for (i = 0; i < num_pcm; i++)
memcpy(&pcm_dev_def[i], &pcm_devs[i], sizeof(struct snd_dev_def));
card_def->pcm_dev_def = pcm_dev_def;
/* fill mixer device node info */
mixer_dev_def = calloc(1, sizeof(struct snd_dev_def));
if (!mixer_dev_def)
goto free_pcm_dev;
memcpy(mixer_dev_def, &mixer_dev, sizeof(struct snd_dev_def));
card_def->mixer_dev_def = mixer_dev_def;
return card_def;
free_pcm_dev:
free(pcm_dev_def);
free_card_def:
free(card_def->name);
free(card_def);
return NULL;
}
void snd_card_def_close_card(void *card_node)
{
struct snd_dev_def_card *defs = (struct snd_dev_def_card *)card_node;
struct snd_dev_def *pcm_dev_def = NULL;
struct snd_dev_def *mixer_dev_def = NULL;
if (!defs)
return;
pcm_dev_def = defs->pcm_dev_def;
if (pcm_dev_def)
free(pcm_dev_def);
mixer_dev_def = defs->mixer_dev_def;
if (!mixer_dev_def)
goto free_defs;
free(mixer_dev_def);
free_defs:
free(defs->name);
free(defs);
}
void *snd_card_def_get_node(void *card_node, unsigned int id, int type)
{
struct snd_dev_def_card *card_def = (struct snd_dev_def_card *)card_node;
struct snd_dev_def *dev_def = NULL;
int i;
if (!card_def)
return NULL;
if (type >= NODE_MAX)
return NULL;
if (type == NODE_MIXER)
return card_def->mixer_dev_def;
if (type == NODE_PCM)
dev_def = card_def->pcm_dev_def;
for (i = 0; i < card_def->num_pcm_nodes; i++) {
if (dev_def[i].device == id) {
return &dev_def[i];
}
}
return NULL;
}
int snd_card_def_get_int(void *node, const char *prop, int *val)
{
struct snd_dev_def *dev_def = (struct snd_dev_def *)node;
int ret = -EINVAL;
if (!dev_def || !prop || !val)
return ret;
if (!strcmp(prop, "type")) {
*val = dev_def->type;
return 0;
} else if (!strcmp(prop, "id")) {
*val = dev_def->device;
return 0;
} else if (!strcmp(prop, "playback")) {
*val = dev_def->playback;
return 0;
} else if (!strcmp(prop, "capture")) {
*val = dev_def->capture;
return 0;
}
return ret;
}
int snd_card_def_get_str(void *node, const char *prop, char **val)
{
struct snd_dev_def *dev_def = (struct snd_dev_def *)node;
int ret = -EINVAL;
if (!dev_def || !prop)
return ret;
if (!strcmp(prop, "so-name")) {
if (dev_def->so_name) {
*val = (char *)dev_def->so_name;
return 0;
}
}
if (!strcmp(prop, "name")) {
if (dev_def->name) {
*val = (char *)dev_def->name;
return 0;
}
}
return ret;
}
void *snd_card_def_get_pcm(void *card_node, unsigned int id)
{
return snd_card_def_get_node(card_node, id, NODE_PCM);
}
void *snd_card_def_get_compress(void *card_node, unsigned int id)
{
return snd_card_def_get_node(card_node, id, NODE_COMPR);
}
void *snd_card_def_get_mixer(void *card_node)
{
return snd_card_def_get_node(card_node, 1, NODE_MIXER);
}
struct snd_node_ops snd_card_ops = {
.open_card = snd_card_def_open_card,
.close_card = snd_card_def_close_card,
.get_int = snd_card_def_get_int,
.get_str = snd_card_def_get_str,
.get_pcm = snd_card_def_get_pcm,
.get_compress = snd_card_def_get_compress,
.get_mixer = snd_card_def_get_mixer,
};