1 /* mixer_io.h 2 ** Copyright (c) 2019, The Linux Foundation. 3 ** 4 ** Redistribution and use in source and binary forms, with or without 5 ** modification, are permitted provided that the following conditions are 6 ** met: 7 ** * Redistributions of source code must retain the above copyright 8 ** notice, this list of conditions and the following disclaimer. 9 ** * Redistributions in binary form must reproduce the above 10 ** copyright notice, this list of conditions and the following 11 ** disclaimer in the documentation and/or other materials provided 12 ** with the distribution. 13 ** * Neither the name of The Linux Foundation nor the names of its 14 ** contributors may be used to endorse or promote products derived 15 ** from this software without specific prior written permission. 16 ** 17 ** THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED 18 ** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT 20 ** ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 21 ** BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 ** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 ** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 24 ** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 25 ** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 26 ** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN 27 ** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 **/ 29 30 #ifndef TINYALSA_SRC_MIXER_H 31 #define TINYALSA_SRC_MIXER_H 32 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <sound/asound.h> 36 37 struct mixer_ops; 38 39 int mixer_hw_open(unsigned int card, void **data, 40 const struct mixer_ops **ops); 41 int mixer_plugin_open(unsigned int card, void **data, 42 const struct mixer_ops **ops); 43 44 struct mixer_ops { 45 void (*close) (void *data); 46 int (*get_poll_fd) (void *data, struct pollfd *pfd, int count); 47 ssize_t (*read_event) (void *data, struct snd_ctl_event *ev, size_t size); 48 int (*ioctl) (void *data, unsigned int cmd, ...); 49 }; 50 51 #endif /* TINYALSA_SRC_MIXER_H */ 52