audio.h

qemu虚拟机代码

/*
 * QEMU Audio subsystem header
 *
 * Copyright (c) 2003-2005 Vassili Karpov (malc)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#ifndef QEMU_AUDIO_H
#define QEMU_AUDIO_H

#include "sys-queue.h"

typedef void (*audio_callback_fn_t) (void *opaque, int avail);

typedef enum {
    AUD_FMT_U8,
    AUD_FMT_S8,
    AUD_FMT_U16,
    AUD_FMT_S16
} audfmt_e;

typedef struct {
    int freq;
    int nchannels;
    audfmt_e fmt;
} audsettings_t;

typedef struct AudioState AudioState;
typedef struct SWVoiceOut SWVoiceOut;
typedef struct SWVoiceIn SWVoiceIn;

typedef struct QEMUSoundCard {
    AudioState *audio;
    char *name;
    LIST_ENTRY (QEMUSoundCard) entries;
} QEMUSoundCard;

typedef struct QEMUAudioTimeStamp {
    uint64_t old_ts;
} QEMUAudioTimeStamp;

void AUD_vlog (const char *cap, const char *fmt, va_list ap);
void AUD_log (const char *cap, const char *fmt, ...)
#ifdef __GNUC__
    __attribute__ ((__format__ (__printf__, 2, 3)))
#endif
    ;

AudioState *AUD_init (void);
void AUD_help (void);
void AUD_register_card (AudioState *s, const char *name, QEMUSoundCard *card);
void AUD_remove_card (QEMUSoundCard *card);

SWVoiceOut *AUD_open_out (
    QEMUSoundCard *card,
    SWVoiceOut *sw,
    const char *name,
    void *callback_opaque,
    audio_callback_fn_t callback_fn,
    audsettings_t *settings,
    int sw_endian
    );

void AUD_close_out (QEMUSoundCard *card, SWVoiceOut *sw);
int  AUD_write (SWVoiceOut *sw, void *pcm_buf, int size);
int  AUD_get_buffer_size_out (SWVoiceOut *sw);
void AUD_set_active_out (SWVoiceOut *sw, int on);
int  AUD_is_active_out (SWVoiceOut *sw);

void     AUD_init_time_stamp_out (SWVoiceOut *sw, QEMUAudioTimeStamp *ts);
uint64_t AUD_get_elapsed_usec_out (SWVoiceOut *sw, QEMUAudioTimeStamp *ts);

SWVoiceIn *AUD_open_in (
    QEMUSoundCard *card,
    SWVoiceIn *sw,
    const char *name,
    void *callback_opaque,
    audio_callback_fn_t callback_fn,
    audsettings_t *settings,
    int sw_endian
    );

void AUD_close_in (QEMUSoundCard *card, SWVoiceIn *sw);
int  AUD_read (SWVoiceIn *sw, void *pcm_buf, int size);
void AUD_set_active_in (SWVoiceIn *sw, int on);
int  AUD_is_active_in (SWVoiceIn *sw);

void     AUD_init_time_stamp_in (SWVoiceIn *sw, QEMUAudioTimeStamp *ts);
uint64_t AUD_get_elapsed_usec_in (SWVoiceIn *sw, QEMUAudioTimeStamp *ts);

static inline void *advance (void *p, int incr)
{
    uint8_t *d = p;
    return (d + incr);
}

uint32_t popcount (uint32_t u);
inline uint32_t lsbindex (uint32_t u);

#ifdef __GNUC__
#define audio_MIN(a, b) ( __extension__ ({      \
    __typeof (a) ta = a;                        \
    __typeof (b) tb = b;                        \
    ((ta)>(tb)?(tb):(ta));                      \
}))

#define audio_MAX(a, b) ( __extension__ ({      \
    __typeof (a) ta = a;                        \
    __typeof (b) tb = b;                        \
    ((ta)<(tb)?(tb):(ta));                      \
}))
#else
#define audio_MIN(a, b) ((a)>(b)?(b):(a))
#define audio_MAX(a, b) ((a)<(b)?(b):(a))
#endif

#endif  /* audio.h */