1 /* sample_sndcardparser.c
2 **
3 ** Copyright (c) 2021, The Linux Foundation. All rights reserved.
4 **
5 ** Redistribution and use in source and binary forms, with or without
6 ** modification, are permitted provided that the following conditions are
7 ** met:
8 ** * Redistributions of source code must retain the above copyright
9 ** notice, this list of conditions and the following disclaimer.
10 ** * Redistributions in binary form must reproduce the above
11 ** copyright notice, this list of conditions and the following
12 ** disclaimer in the documentation and/or other materials provided
13 ** with the distribution.
14 ** * Neither the name of The Linux Foundation nor the names of its
15 ** contributors may be used to endorse or promote products derived
16 ** from this software without specific prior written permission.
17 **
18 ** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
19 ** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
21 ** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
22 ** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 ** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 ** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
25 ** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
26 ** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
27 ** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
28 ** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 **/
30
31 #include <errno.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 #define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
37
38 #define VIRTUAL_SND_CARD_ID 100
39 #define MAX_PATH 256
40 #define BUF_SIZE 1024
41
42 enum snd_node_type {
43 NODE_TYPE_HW = 0,
44 NODE_TYPE_PLUGIN,
45 NODE_TYPE_INVALID,
46 };
47
48 enum {
49 NODE_PCM,
50 NODE_COMPR,
51 NODE_MIXER,
52 NODE_MAX,
53 };
54
55 struct snd_node_ops {
56 /** Function pointer to get card definition */
57 void* (*open_card)(unsigned int card);
58 /** Function pointer to release card definition */
59 void (*close_card)(void *card);
60 /** Get interger type properties from device definition */
61 int (*get_int)(void *node, const char *prop, int *val);
62 /** Get string type properties from device definition */
63 int (*get_str)(void *node, const char *prop, char **val);
64 /** Function pointer to get mixer definition */
65 void* (*get_mixer)(void *card);
66 /** Function pointer to get PCM definition */
67 void* (*get_pcm)(void *card, unsigned int id);
68 /** Function pointer to get COMPRESS definition */
69 void* (*get_compress)(void *card, unsigned int id);
70 };
71
72 struct snd_dev_def {
73 unsigned int device;
74 int type;
75 const char *name;
76 const char *so_name;
77 int playback; //used only for pcm node
78 int capture; //used only for pcm node
79 /* add custom props here */
80 };
81
82 struct snd_dev_def_card {
83 unsigned int card;
84 char *name;
85
86 /* child device details */
87 int num_pcm_nodes;
88 struct snd_dev_def *pcm_dev_def;
89
90 struct snd_dev_def *mixer_dev_def;
91 };
92
93 struct snd_dev_def pcm_devs[] = {
94 {100, NODE_TYPE_PLUGIN, "PCM100", "libtinyalsav2_example_plugin_pcm.so", 1, 0},
95 /* Add other plugin info here */
96 };
97
98 struct snd_dev_def mixer_dev =
99 {VIRTUAL_SND_CARD_ID, NODE_TYPE_PLUGIN, "virtual-snd-card", "libtinyalsav2_example_plugin_mixer.so", 0, 0};
100
snd_card_def_open_card(unsigned int card)101 void *snd_card_def_open_card(unsigned int card)
102 {
103 struct snd_dev_def_card *card_def = NULL;
104 struct snd_dev_def *pcm_dev_def = NULL;
105 struct snd_dev_def *mixer_dev_def = NULL;
106 int num_pcm = ARRAY_SIZE(pcm_devs);
107 int i;
108
109 if (card != VIRTUAL_SND_CARD_ID)
110 return NULL;
111
112 card_def = calloc(1, sizeof(struct snd_dev_def_card));
113 if (!card_def)
114 return card_def;
115
116 card_def->card = card;
117 card_def->name = strdup("virtual-snd-card");
118
119 /* fill pcm device node info */
120 card_def->num_pcm_nodes = num_pcm;
121 pcm_dev_def = calloc(num_pcm, sizeof(struct snd_dev_def));
122 if (!pcm_dev_def)
123 goto free_card_def;
124
125 for (i = 0; i < num_pcm; i++)
126 memcpy(&pcm_dev_def[i], &pcm_devs[i], sizeof(struct snd_dev_def));
127
128 card_def->pcm_dev_def = pcm_dev_def;
129
130 /* fill mixer device node info */
131 mixer_dev_def = calloc(1, sizeof(struct snd_dev_def));
132 if (!mixer_dev_def)
133 goto free_pcm_dev;
134
135 memcpy(mixer_dev_def, &mixer_dev, sizeof(struct snd_dev_def));
136
137 card_def->mixer_dev_def = mixer_dev_def;
138 return card_def;
139 free_pcm_dev:
140 free(pcm_dev_def);
141 free_card_def:
142 free(card_def->name);
143 free(card_def);
144 return NULL;
145 }
146
snd_card_def_close_card(void * card_node)147 void snd_card_def_close_card(void *card_node)
148 {
149 struct snd_dev_def_card *defs = (struct snd_dev_def_card *)card_node;
150 struct snd_dev_def *pcm_dev_def = NULL;
151 struct snd_dev_def *mixer_dev_def = NULL;
152
153 if (!defs)
154 return;
155
156 pcm_dev_def = defs->pcm_dev_def;
157 if (pcm_dev_def)
158 free(pcm_dev_def);
159
160 mixer_dev_def = defs->mixer_dev_def;
161 if (!mixer_dev_def)
162 goto free_defs;
163
164 free(mixer_dev_def);
165 free_defs:
166 free(defs->name);
167 free(defs);
168 }
169
snd_card_def_get_node(void * card_node,unsigned int id,int type)170 void *snd_card_def_get_node(void *card_node, unsigned int id, int type)
171 {
172 struct snd_dev_def_card *card_def = (struct snd_dev_def_card *)card_node;
173 struct snd_dev_def *dev_def = NULL;
174 int i;
175
176 if (!card_def)
177 return NULL;
178
179 if (type >= NODE_MAX)
180 return NULL;
181
182 if (type == NODE_MIXER)
183 return card_def->mixer_dev_def;
184
185 if (type == NODE_PCM)
186 dev_def = card_def->pcm_dev_def;
187
188 for (i = 0; i < card_def->num_pcm_nodes; i++) {
189 if (dev_def[i].device == id) {
190 return &dev_def[i];
191 }
192 }
193
194 return NULL;
195 }
196
snd_card_def_get_int(void * node,const char * prop,int * val)197 int snd_card_def_get_int(void *node, const char *prop, int *val)
198 {
199 struct snd_dev_def *dev_def = (struct snd_dev_def *)node;
200 int ret = -EINVAL;
201
202 if (!dev_def || !prop || !val)
203 return ret;
204
205 if (!strcmp(prop, "type")) {
206 *val = dev_def->type;
207 return 0;
208 } else if (!strcmp(prop, "id")) {
209 *val = dev_def->device;
210 return 0;
211 } else if (!strcmp(prop, "playback")) {
212 *val = dev_def->playback;
213 return 0;
214 } else if (!strcmp(prop, "capture")) {
215 *val = dev_def->capture;
216 return 0;
217 }
218
219 return ret;
220 }
221
snd_card_def_get_str(void * node,const char * prop,char ** val)222 int snd_card_def_get_str(void *node, const char *prop, char **val)
223 {
224 struct snd_dev_def *dev_def = (struct snd_dev_def *)node;
225 int ret = -EINVAL;
226
227 if (!dev_def || !prop)
228 return ret;
229
230 if (!strcmp(prop, "so-name")) {
231 if (dev_def->so_name) {
232 *val = (char *)dev_def->so_name;
233 return 0;
234 }
235 }
236
237 if (!strcmp(prop, "name")) {
238 if (dev_def->name) {
239 *val = (char *)dev_def->name;
240 return 0;
241 }
242 }
243
244 return ret;
245 }
246
snd_card_def_get_pcm(void * card_node,unsigned int id)247 void *snd_card_def_get_pcm(void *card_node, unsigned int id)
248 {
249 return snd_card_def_get_node(card_node, id, NODE_PCM);
250 }
251
snd_card_def_get_compress(void * card_node,unsigned int id)252 void *snd_card_def_get_compress(void *card_node, unsigned int id)
253 {
254 return snd_card_def_get_node(card_node, id, NODE_COMPR);
255 }
256
snd_card_def_get_mixer(void * card_node)257 void *snd_card_def_get_mixer(void *card_node)
258 {
259 return snd_card_def_get_node(card_node, 1, NODE_MIXER);
260 }
261
262 struct snd_node_ops snd_card_ops = {
263 .open_card = snd_card_def_open_card,
264 .close_card = snd_card_def_close_card,
265 .get_int = snd_card_def_get_int,
266 .get_str = snd_card_def_get_str,
267 .get_pcm = snd_card_def_get_pcm,
268 .get_compress = snd_card_def_get_compress,
269 .get_mixer = snd_card_def_get_mixer,
270 };
271