1 /* mixer_io.h 2 ** 3 ** Copyright (c) 2019, 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 #ifndef __MIXER_H__ 32 #define __MIXER_H__ 33 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <sound/asound.h> 37 38 struct mixer_ops; 39 40 int mixer_hw_open(unsigned int card, void **data, 41 struct mixer_ops **ops); 42 int mixer_plugin_open(unsigned int card, void **data, 43 struct mixer_ops **ops); 44 45 struct mixer_ops { 46 void (*close) (void *data); 47 int (*get_poll_fd) (void *data, struct pollfd *pfd, int count); 48 ssize_t (*read_event) (void *data, struct snd_ctl_event *ev, size_t size); 49 int (*ioctl) (void *data, unsigned int cmd, ...); 50 }; 51 52 #endif /* end of __MIXER_H__ */ 53