source: downloads/openal-0.0.8/src/backends/alc_backend_esd.c @ 37

/* -*- mode: C; tab-width:8; c-basic-offset:8 -*-
 * vi:set ts=8:
 *
 * esd.c
 *
 * esd backend.
 */
#include "al_siteconfig.h"

#include <AL/al.h>
#include <assert.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>

#include "al_main.h"
#include "al_debug.h"

#include "backends/alc_backend.h"

#include "alc/alc_context.h"

#ifdef OPENAL_DLOPEN_ESD
#include <dlfcn.h>
#endif

#include <esd.h>

#define DEF_SPEED       _ALC_CANON_SPEED
#define DEF_SIZE        _AL_DEF_BUFSIZ
#define DEF_SAMPLES     (DEF_SIZE / 2)
#define DEF_CHANNELS    2
#define DEF_FORMAT      AL_FORMAT_STEREO16

#define ESD_KEY        "openal"
#define ESD_NAMELEN    1024

static const char *genesdkey(void);
static int openal_load_esd_library(void);


/*
 * ESD library functions.
 */
static int (*pesd_open_sound)( const char *host );
static int (*pesd_play_stream)( esd_format_t format, int rate, 
                     const char *host, const char *name );
static int (*pesd_standby)( int esd );
static int (*pesd_resume)( int esd );
static int (*pesd_close)( int esd );

/*
 * ESD library handle.
 */
static void * esd_lib_handle = NULL;

static int openal_load_esd_library(void)
{
#ifdef OPENAL_DLOPEN_ESD
        char * error = NULL;
#endif
    
        if (esd_lib_handle != NULL)
                return 1;  /* already loaded. */

        #ifdef OPENAL_DLOPEN_ESD
                #define OPENAL_LOAD_ESD_SYMBOL(x) p##x = dlsym(esd_lib_handle, #x); \
                                                   error = dlerror(); \
                                                   if (p##x == NULL) { \
                                                           fprintf(stderr,"Could not resolve ESoundD symbol %s: %s\n", #x, ((error!=NULL)?(error):("(null)"))); \
                                                           dlclose(esd_lib_handle); esd_lib_handle = NULL; \
                                                           return 0; }
                dlerror(); /* clear error state */
                esd_lib_handle = dlopen("libesd.so", RTLD_LAZY | RTLD_GLOBAL);
                error = dlerror();
                if (esd_lib_handle == NULL) {
                        fprintf(stderr,"Could not open ESoundD library: %s\n",((error!=NULL)?(error):("(null)")));
                        return 0;
                }
        #else
                #define OPENAL_LOAD_ESD_SYMBOL(x) p##x = x;
                esd_lib_handle = (void *) 0xF00DF00D;
        #endif

        OPENAL_LOAD_ESD_SYMBOL(esd_open_sound);
        OPENAL_LOAD_ESD_SYMBOL(esd_standby);
        OPENAL_LOAD_ESD_SYMBOL(esd_resume);
        OPENAL_LOAD_ESD_SYMBOL(esd_play_stream);
        OPENAL_LOAD_ESD_SYMBOL(esd_close);
                
        return 1;
}

static fd_set esd_fd_set;

typedef struct esd_info_s {
        esd_format_t fmt;
        ALuint speed;
        const char *espeaker;
        char name[ESD_NAMELEN];
        int socket;

        ALboolean paused;
        int esdhandle; /* esd handle */
} esd_openal_info_t;

static esd_openal_info_t esd_info;

static void *grab_write_esd(void) {
        esd_format_t fmt;
        int socket;
        const char *esdkey = genesdkey();
        const char *espeaker = getenv("ESPEAKER");
        int esd;

        if (!openal_load_esd_library()) {
                return NULL;
        }
    
        esd = pesd_open_sound(espeaker);
        if(esd < 0) {
                fprintf(stderr, "esd open sound failed.\n");
                return NULL;
        }

        fmt = ESD_STREAM | ESD_PLAY;

        switch(DEF_CHANNELS) {
                case 1: fmt |= ESD_MONO; break;
                case 2: fmt |= ESD_STEREO; break;
                default: break;
        }

        switch(_alGetBitsFromFormat(DEF_FORMAT)) {
                case 8:  fmt |= ESD_BITS8; break;
                case 16: fmt |= ESD_BITS16; break;
                default: break;
        }

        socket = pesd_play_stream(fmt, DEF_SPEED, espeaker, esdkey);

        if(socket < 0) {
                fprintf(stderr, "esd play stream failed.\n");
                return NULL;
        }

        fprintf(stderr, "esd grab audio ok\n");

        _alDebug(ALD_CONTEXT, __FILE__, __LINE__,
                "esd grab audio ok");

        esd_info.speed     = DEF_SPEED;
        esd_info.fmt       = fmt;
        esd_info.socket    = socket;
        esd_info.espeaker  = espeaker;
        esd_info.paused    = AL_FALSE;
        esd_info.esdhandle = esd;

        strncpy(esd_info.name, esdkey, ESD_NAMELEN);

        return &esd_info;
}

static void *grab_read_esd(void) {
        return NULL;
}

void *
alcBackendOpenESD_( ALC_OpenMode mode )
{
        return mode == ALC_OPEN_INPUT_ ? grab_read_esd() : grab_write_esd();
}

void esd_blitbuffer(void *handle, void *dataptr, int bytes_to_write)  {
        esd_openal_info_t *eh;
        struct timeval tv = { 0, 9000000 };
        int iterator = 0;
        int err;
        int fd;

        if(handle == NULL) {
                return;
        }

        eh = (esd_openal_info_t *) handle;

        if(eh->paused == AL_TRUE) {
                /* don't write to paused audio devices, just sleep */
                tv.tv_usec = 10000;

                select(0, NULL, NULL, NULL, &tv);

                return;
        }

        fd = eh->socket;

        for(iterator = bytes_to_write; iterator > 0; ) {
                FD_ZERO(&esd_fd_set);
                FD_SET(fd, &esd_fd_set);

                err = select(fd + 1, NULL, &esd_fd_set, NULL, &tv);
                if(FD_ISSET(fd, &esd_fd_set) == 0) {
                        /* timeout occured, don't try and write */
                        fprintf(stderr, "esd_blitbuffer: timeout occured\n");

                        assert(0);
                        return;
                }

                assert(iterator > 0);
                assert(iterator <= bytes_to_write);

                err = write(fd,
                            (char *) dataptr + bytes_to_write - iterator,
                            iterator);
                if(err < 0) {
                        assert(0);
#ifdef DEBUG_MAXIMUS
                        perror("write");
#endif
                        return;
                }

                iterator -= err;
        };

        return;
}

void release_esd(void *handle) {
        esd_openal_info_t *eh;

        if(handle == NULL) {
                return;
        }

        eh = (esd_openal_info_t *) handle;

        pesd_close(eh->esdhandle);

        return;
}

static const char *genesdkey(void) {
        static char retval[ESD_NAMELEN];

        snprintf(retval, sizeof(retval), "openal-%d\n", (int) getpid());

        return retval;
}

void pause_esd(void *handle) {
        esd_openal_info_t *eh;

        if(handle == NULL) {
                return;
        }

        eh = (esd_openal_info_t *) handle;

        eh->paused = AL_TRUE;
        pesd_standby(eh->esdhandle);

        return;
}

void resume_esd(void *handle) {
        esd_openal_info_t *eh;

        if(handle == NULL) {
                return;
        }

        eh = (esd_openal_info_t *) handle;

        eh->paused = AL_FALSE;
        pesd_resume(eh->esdhandle);

        return;
}

static ALboolean set_write_esd(UNUSED(void *handle),
                               UNUSED(ALuint *bufsiz),
                               ALenum *fmt,
                               ALuint *speed) {
        esd_openal_info_t *eh;
        int socket;
        ALuint chans = _alGetChannelsFromFormat(*fmt);

        if(handle == NULL) {
                return AL_FALSE;
        }

        eh = (esd_openal_info_t *) handle;

        close(eh->socket);

        eh->fmt = ESD_STREAM | ESD_PLAY;

        switch(chans) {
                case 1: eh->fmt |= ESD_MONO; break;
                case 2: eh->fmt |= ESD_STEREO; break;
                default: break;
        }

        switch(_alGetBitsFromFormat(*fmt)) {
                case 8:  eh->fmt |= ESD_BITS8; break;
                case 16: eh->fmt |= ESD_BITS16; break;
                default: break;
        }

        eh->speed = *speed;

        socket = pesd_play_stream(eh->fmt,
                                 eh->speed,
                                 eh->espeaker,
                                 eh->name);
        if(socket < 0) {
                return AL_FALSE;
        }

        eh->socket = socket;
        eh->paused = AL_FALSE;

        return AL_TRUE;
}

static ALboolean set_read_esd(UNUSED(void *handle),
                              UNUSED(ALuint *bufsiz),
                              UNUSED(ALenum *fmt),
                              UNUSED(ALuint *speed)) {
        return AL_FALSE;
}

ALboolean
alcBackendSetAttributesESD_(ALC_OpenMode mode, void *handle, ALuint *bufsiz, ALenum *fmt, ALuint *speed)
{
        return mode == ALC_OPEN_INPUT_ ?
                set_read_esd(handle, bufsiz, fmt, speed) :
                set_write_esd(handle, bufsiz, fmt, speed);
}

ALsizei
capture_esd( UNUSED(void *handle), UNUSED(void *capture_buffer), UNUSED(int bufsiz) )
{
        return 0;
}

ALfloat
get_esdchannel( UNUSED(void *handle), UNUSED(ALuint channel) )
{
        return 0.0;
}

int
set_esdchannel( UNUSED(void *handle), UNUSED(ALuint channel), UNUSED(ALfloat volume) )
{
        return 0;
}