pcm_oss.h

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#ifndef __SOUND_PCM_OSS_H
#define __SOUND_PCM_OSS_H

/*
 *  Digital Audio (PCM) - OSS compatibility abstract layer
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

struct snd_pcm_oss_setup {
    char *task_name;
    unsigned int disable:1,
             direct:1,
             block:1,
             nonblock:1,
             partialfrag:1,
             nosilence:1,
             buggyptr:1;
    unsigned int periods;
    unsigned int period_size;
    struct snd_pcm_oss_setup *next;
};

struct snd_pcm_oss_runtime {
    unsigned params: 1,         /* format/parameter change */
         prepare: 1,            /* need to prepare the operation */
         trigger: 1,            /* trigger flag */
         sync_trigger: 1;       /* sync trigger flag */
    int rate;               /* requested rate */
    int format;             /* requested OSS format */
    unsigned int channels;          /* requested channels */
    unsigned int fragshift;
    unsigned int maxfrags;
    unsigned int subdivision;       /* requested subdivision */
    size_t period_bytes;            /* requested period size */
    size_t period_frames;           /* period frames for poll */
    size_t period_ptr;          /* actual write pointer to period */
    unsigned int periods;
    size_t buffer_bytes;            /* requested buffer size */
    size_t bytes;               /* total # bytes processed */
    size_t mmap_bytes;
    char *buffer;               /* vmallocated period */
    size_t buffer_used;         /* used length from period buffer */
    struct mutex params_lock;
#ifdef CONFIG_SND_PCM_OSS_PLUGINS
    struct snd_pcm_plugin *plugin_first;
    struct snd_pcm_plugin *plugin_last;
#endif
    unsigned int prev_hw_ptr_period;
};

struct snd_pcm_oss_file {
    struct snd_pcm_substream *streams[2];
};

struct snd_pcm_oss_substream {
    unsigned oss: 1;            /* oss mode */
    struct snd_pcm_oss_setup setup;     /* active setup */
};

struct snd_pcm_oss_stream {
    struct snd_pcm_oss_setup *setup_list;   /* setup list */
    struct mutex setup_mutex;
#ifdef CONFIG_SND_VERBOSE_PROCFS
    struct snd_info_entry *proc_entry;
#endif
};

struct snd_pcm_oss {
    int reg;
    unsigned int reg_mask;
};

#endif /* __SOUND_PCM_OSS_H */