mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-10-29 05:40:25 -04:00
357 lines
8.4 KiB
C
357 lines
8.4 KiB
C
/*
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* RawMIDI - Hardware
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* Copyright (c) 2000 by Jaroslav Kysela <perex@suse.cz>
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* Abramo Bagnara <abramo@alsa-project.org>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include "../control/control_local.h"
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#include "rawmidi_local.h"
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#ifndef PIC
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/* entry for static linking */
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const char *_snd_module_rawmidi_hw = "";
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#endif
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#define SNDRV_FILE_RAWMIDI "/dev/snd/midiC%iD%i"
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#define SNDRV_RAWMIDI_VERSION_MAX SNDRV_PROTOCOL_VERSION(2, 0, 0)
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typedef struct {
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int open;
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int fd;
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int card, device, subdevice;
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} snd_rawmidi_hw_t;
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static int snd_rawmidi_hw_close(snd_rawmidi_t *rmidi)
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{
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snd_rawmidi_hw_t *hw = rmidi->private_data;
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hw->open--;
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if (hw->open)
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return 0;
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if (close(hw->fd)) {
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SYSERR("close failed\n");
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return -errno;
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}
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free(hw);
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return 0;
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}
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static int snd_rawmidi_hw_nonblock(snd_rawmidi_t *rmidi, int nonblock)
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{
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snd_rawmidi_hw_t *hw = rmidi->private_data;
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long flags;
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if ((flags = fcntl(hw->fd, F_GETFL)) < 0) {
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SYSERR("F_GETFL failed");
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return -errno;
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}
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if (nonblock)
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flags |= O_NONBLOCK;
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else
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flags &= ~O_NONBLOCK;
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if (fcntl(hw->fd, F_SETFL, flags) < 0) {
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SYSERR("F_SETFL for O_NONBLOCK failed");
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return -errno;
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}
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return 0;
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}
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static int snd_rawmidi_hw_info(snd_rawmidi_t *rmidi, snd_rawmidi_info_t * info)
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{
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snd_rawmidi_hw_t *hw = rmidi->private_data;
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info->stream = rmidi->stream;
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if (ioctl(hw->fd, SNDRV_RAWMIDI_IOCTL_INFO, info) < 0) {
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SYSERR("SNDRV_RAWMIDI_IOCTL_INFO failed");
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return -errno;
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}
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return 0;
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}
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static int snd_rawmidi_hw_params(snd_rawmidi_t *rmidi, snd_rawmidi_params_t * params)
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{
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snd_rawmidi_hw_t *hw = rmidi->private_data;
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params->stream = rmidi->stream;
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if (ioctl(hw->fd, SNDRV_RAWMIDI_IOCTL_PARAMS, params) < 0) {
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SYSERR("SNDRV_RAWMIDI_IOCTL_PARAMS failed");
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return -errno;
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}
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return 0;
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}
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static int snd_rawmidi_hw_status(snd_rawmidi_t *rmidi, snd_rawmidi_status_t * status)
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{
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snd_rawmidi_hw_t *hw = rmidi->private_data;
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status->stream = rmidi->stream;
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if (ioctl(hw->fd, SNDRV_RAWMIDI_IOCTL_STATUS, status) < 0) {
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SYSERR("SNDRV_RAWMIDI_IOCTL_STATUS failed");
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return -errno;
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}
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return 0;
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}
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static int snd_rawmidi_hw_drop(snd_rawmidi_t *rmidi)
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{
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snd_rawmidi_hw_t *hw = rmidi->private_data;
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int str = rmidi->stream;
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if (ioctl(hw->fd, SNDRV_RAWMIDI_IOCTL_DROP, &str) < 0) {
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SYSERR("SNDRV_RAWMIDI_IOCTL_DROP failed");
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return -errno;
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}
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return 0;
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}
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static int snd_rawmidi_hw_drain(snd_rawmidi_t *rmidi)
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{
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snd_rawmidi_hw_t *hw = rmidi->private_data;
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int str = rmidi->stream;
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if (ioctl(hw->fd, SNDRV_RAWMIDI_IOCTL_DRAIN, &str) < 0) {
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SYSERR("SNDRV_RAWMIDI_IOCTL_DRAIN failed");
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return -errno;
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}
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return 0;
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}
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static ssize_t snd_rawmidi_hw_write(snd_rawmidi_t *rmidi, const void *buffer, size_t size)
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{
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snd_rawmidi_hw_t *hw = rmidi->private_data;
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ssize_t result;
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result = write(hw->fd, buffer, size);
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if (result < 0)
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return -errno;
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return result;
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}
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static ssize_t snd_rawmidi_hw_read(snd_rawmidi_t *rmidi, void *buffer, size_t size)
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{
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snd_rawmidi_hw_t *hw = rmidi->private_data;
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ssize_t result;
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result = read(hw->fd, buffer, size);
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if (result < 0)
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return -errno;
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return result;
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}
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snd_rawmidi_ops_t snd_rawmidi_hw_ops = {
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close: snd_rawmidi_hw_close,
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nonblock: snd_rawmidi_hw_nonblock,
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info: snd_rawmidi_hw_info,
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params: snd_rawmidi_hw_params,
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status: snd_rawmidi_hw_status,
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drop: snd_rawmidi_hw_drop,
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drain: snd_rawmidi_hw_drain,
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write: snd_rawmidi_hw_write,
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read: snd_rawmidi_hw_read,
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};
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int snd_rawmidi_hw_open(snd_rawmidi_t **inputp, snd_rawmidi_t **outputp,
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const char *name, int card, int device, int subdevice,
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int mode)
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{
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int fd, ver, ret;
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int attempt = 0;
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char filename[32];
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snd_ctl_t *ctl;
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snd_rawmidi_t *rmidi;
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snd_rawmidi_hw_t *hw = NULL;
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snd_rawmidi_info_t info;
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int fmode;
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if (inputp)
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*inputp = NULL;
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if (outputp)
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*outputp = NULL;
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if ((ret = snd_ctl_hw_open(&ctl, NULL, card, 0)) < 0)
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return ret;
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sprintf(filename, SNDRV_FILE_RAWMIDI, card, device);
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__again:
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if (attempt++ > 3) {
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snd_ctl_close(ctl);
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return -EBUSY;
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}
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ret = snd_ctl_rawmidi_prefer_subdevice(ctl, subdevice);
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if (ret < 0) {
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snd_ctl_close(ctl);
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return ret;
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}
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if (!inputp)
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fmode = O_WRONLY;
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else if (!outputp)
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fmode = O_RDONLY;
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else
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fmode = O_RDWR;
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if (mode & SND_RAWMIDI_APPEND) {
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assert(outputp);
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fmode |= O_APPEND;
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}
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if (mode & SND_RAWMIDI_NONBLOCK) {
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fmode |= O_NONBLOCK;
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}
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if (mode & SND_RAWMIDI_SYNC) {
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fmode |= O_SYNC;
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}
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assert(!(mode & ~(SND_RAWMIDI_APPEND|SND_RAWMIDI_NONBLOCK)));
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if ((fd = open(filename, fmode)) < 0) {
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snd_card_load(card);
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if ((fd = open(filename, fmode)) < 0) {
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snd_ctl_close(ctl);
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SYSERR("open %s failed", filename);
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return -errno;
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}
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}
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if (ioctl(fd, SNDRV_RAWMIDI_IOCTL_PVERSION, &ver) < 0) {
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ret = -errno;
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SYSERR("SNDRV_RAWMIDI_IOCTL_PVERSION failed");
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close(fd);
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snd_ctl_close(ctl);
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return ret;
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}
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if (SNDRV_PROTOCOL_INCOMPATIBLE(ver, SNDRV_RAWMIDI_VERSION_MAX)) {
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close(fd);
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snd_ctl_close(ctl);
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return -SND_ERROR_INCOMPATIBLE_VERSION;
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}
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if (subdevice >= 0) {
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memset(&info, 0, sizeof(info));
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if (ioctl(fd, SNDRV_RAWMIDI_IOCTL_INFO, &info) < 0) {
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SYSERR("SNDRV_RAWMIDI_IOCTL_INFO failed");
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ret = -errno;
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close(fd);
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snd_ctl_close(ctl);
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return ret;
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}
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if (info.subdevice != (unsigned int) subdevice) {
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close(fd);
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goto __again;
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}
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}
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snd_ctl_close(ctl);
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hw = calloc(1, sizeof(snd_rawmidi_hw_t));
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if (hw == NULL)
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goto _nomem;
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hw->card = card;
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hw->device = device;
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hw->subdevice = subdevice;
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hw->fd = fd;
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if (inputp) {
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rmidi = calloc(1, sizeof(snd_rawmidi_t));
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if (rmidi == NULL)
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goto _nomem;
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if (name)
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rmidi->name = strdup(name);
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rmidi->type = SND_RAWMIDI_TYPE_HW;
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rmidi->stream = SND_RAWMIDI_STREAM_INPUT;
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rmidi->mode = mode;
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rmidi->poll_fd = fd;
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rmidi->ops = &snd_rawmidi_hw_ops;
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rmidi->private_data = hw;
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hw->open++;
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*inputp = rmidi;
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}
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if (outputp) {
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rmidi = calloc(1, sizeof(snd_rawmidi_t));
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if (rmidi == NULL)
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goto _nomem;
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if (name)
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rmidi->name = strdup(name);
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rmidi->type = SND_RAWMIDI_TYPE_HW;
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rmidi->stream = SND_RAWMIDI_STREAM_OUTPUT;
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rmidi->mode = mode;
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rmidi->poll_fd = fd;
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rmidi->ops = &snd_rawmidi_hw_ops;
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rmidi->private_data = hw;
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hw->open++;
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*outputp = rmidi;
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}
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return 0;
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_nomem:
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close(fd);
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if (hw)
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free(hw);
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if (inputp && *inputp)
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free(*inputp);
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if (outputp && *outputp)
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free(*outputp);
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return -ENOMEM;
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}
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int _snd_rawmidi_hw_open(snd_rawmidi_t **inputp, snd_rawmidi_t **outputp,
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char *name, snd_config_t *root ATTRIBUTE_UNUSED,
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snd_config_t *conf, int mode)
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{
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snd_config_iterator_t i, next;
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long card = -1, device = 0, subdevice = -1;
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const char *str;
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int err;
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snd_config_for_each(i, next, conf) {
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snd_config_t *n = snd_config_iterator_entry(i);
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const char *id;
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if (snd_config_get_id(n, &id) < 0)
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continue;
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if (strcmp(id, "comment") == 0)
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continue;
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if (strcmp(id, "type") == 0)
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continue;
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if (strcmp(id, "card") == 0) {
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err = snd_config_get_integer(n, &card);
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if (err < 0) {
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err = snd_config_get_string(n, &str);
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if (err < 0)
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return -EINVAL;
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card = snd_card_get_index(str);
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if (card < 0)
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return card;
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}
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continue;
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}
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if (strcmp(id, "device") == 0) {
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err = snd_config_get_integer(n, &device);
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if (err < 0)
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return err;
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continue;
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}
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if (strcmp(id, "subdevice") == 0) {
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err = snd_config_get_integer(n, &subdevice);
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if (err < 0)
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return err;
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continue;
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}
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return -EINVAL;
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}
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if (card < 0)
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return -EINVAL;
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return snd_rawmidi_hw_open(inputp, outputp, name, card, device, subdevice, mode);
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}
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SND_DLSYM_BUILD_VERSION(_snd_rawmidi_hw_open, SND_RAWMIDI_DLSYM_VERSION);
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