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/*
* vidixlib.c
* VIDIXLib - Library for VIDeo Interface for *niX
* This interface is introduced as universal one to MPEG decoder,
* BES == Back End Scaler and YUV2RGB hw accelerators.
* In the future it may be expanded up to capturing and audio things.
* Main goal of this this interface imlpementation is providing DGA
* everywhere where it's possible (unlike X11 and other).
* Copyright 2002 Nick Kurshev
* Licence: GPL
* This interface is based on v4l2, fbvid.h, mga_vid.h projects
* and personally my ideas.
* NOTE: This interface is introduces as APP interface.
* Don't use it for driver.
* It provides multistreaming. This mean that APP can handle
* several streams simultaneously. (Example: Video capturing and video
* playback or capturing, video playback, audio encoding and so on).
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <dlfcn.h> /* GLIBC specific. Exists under cygwin too! */
#include <dirent.h>
#include "vidixlib.h"
typedef struct vdl_stream_s
{
void * handle;
int (*get_caps)(vidix_capability_t *);
int (*query_fourcc)(vidix_fourcc_t *);
int (*config_playback)(vidix_playback_t *);
int (*playback_on)( void );
int (*playback_off)( void );
/* Functions below can be missed in driver ;) */
int (*init)(void);
void (*destroy)(void);
int (*frame_sel)( unsigned frame_idx );
int (*get_eq)( vidix_video_eq_t * );
int (*set_eq)( const vidix_video_eq_t * );
int (*copy_frame)( const vidix_dma_t * );
}vdl_stream_t;
#define t_vdl(p) (((vdl_stream_t *)p))
extern unsigned vdlGetVersion( void )
{
return VIDIX_VERSION;
}
static int vdl_fill_driver(VDL_HANDLE stream)
{
t_vdl(stream)->init = dlsym(t_vdl(stream)->handle,"vixInit");
t_vdl(stream)->destroy = dlsym(t_vdl(stream)->handle,"vixDestroy");
t_vdl(stream)->get_caps = dlsym(t_vdl(stream)->handle,"vixGetCapability");
t_vdl(stream)->query_fourcc = dlsym(t_vdl(stream)->handle,"vixQueryFourcc");
t_vdl(stream)->config_playback= dlsym(t_vdl(stream)->handle,"vixConfigPlayback");
t_vdl(stream)->playback_on = dlsym(t_vdl(stream)->handle,"vixPlaybackOn");
t_vdl(stream)->playback_off = dlsym(t_vdl(stream)->handle,"vixPlaybackOff");
t_vdl(stream)->frame_sel = dlsym(t_vdl(stream)->handle,"vixPlaybackFrameSelect");
t_vdl(stream)->get_eq = dlsym(t_vdl(stream)->handle,"vixPlaybackGetEq");
t_vdl(stream)->set_eq = dlsym(t_vdl(stream)->handle,"vixPlaybackSetEq");
t_vdl(stream)->copy_frame = dlsym(t_vdl(stream)->handle,"vixPlaybackCopyFrame");
/* check driver viability */
if(!( t_vdl(stream)->get_caps && t_vdl(stream)->query_fourcc &&
t_vdl(stream)->config_playback && t_vdl(stream)->playback_on &&
t_vdl(stream)->playback_off))
return 0;
return 1;
}
static int vdl_probe_driver(VDL_HANDLE stream,const char *path,const char *name,unsigned cap,int verbose)
{
char drv_name[FILENAME_MAX];
vidix_capability_t vid_cap;
unsigned (*_ver)(void);
int (*_probe)(int);
int (*_cap)(vidix_capability_t*);
strcpy(drv_name,path);
strcat(drv_name,name);
if(verbose) printf("vidixlib: PROBING: %s\n",drv_name);
if(!(t_vdl(stream)->handle = dlopen(drv_name,RTLD_NOW|RTLD_GLOBAL))) return 0;
_ver = dlsym(t_vdl(stream)->handle,"vixGetVersion");
_probe = dlsym(t_vdl(stream)->handle,"vixProbe");
_cap = dlsym(t_vdl(stream)->handle,"vixGetCapability");
if(_ver)
{
if((*_ver)() != VIDIX_VERSION)
{
if(verbose) printf("vidixlib: %s has wrong version\n",drv_name);
err:
dlclose(t_vdl(stream)->handle);
t_vdl(stream)->handle = 0;
return 0;
}
}
else
{
fatal_err:
if(verbose) printf("vidixlib: %s has no function definition\n",drv_name);
goto err;
}
if(_probe) { if((*_probe)(verbose) != 0) goto err; }
else goto fatal_err;
if(_cap) { if((*_cap)(&vid_cap) != 0) goto err; }
else goto fatal_err;
if((vid_cap.type & cap) != cap) goto err;
if(verbose) printf("vidixlib: %s probed o'k\n",drv_name);
return 1;
}
static int vdl_find_driver(VDL_HANDLE stream,const char *path,unsigned cap,int verbose)
{
DIR *dstream;
struct dirent *name;
int done = 0;
if(!(dstream = opendir(path))) return 0;
while(!done)
{
name = readdir(dstream);
if(name)
{
if(name->d_name[0] != '.')
if(vdl_probe_driver(stream,path,name->d_name,cap,verbose)) break;
}
else done = 1;
}
closedir(dstream);
return done?0:1;
}
VDL_HANDLE vdlOpen(const char *path,const char *name,unsigned cap,int verbose)
{
vdl_stream_t *stream;
char drv_name[FILENAME_MAX];
if(!(stream = malloc(sizeof(vdl_stream_t)))) return NULL;
memset(stream,0,sizeof(vdl_stream_t));
if(name)
{
unsigned (*ver)(void);
int (*probe)(int);
unsigned version = 0;
strcpy(drv_name,path);
strcat(drv_name,name);
if(!(t_vdl(stream)->handle = dlopen(drv_name,RTLD_NOW|RTLD_GLOBAL)))
{
err:
free(stream);
return NULL;
}
ver = dlsym(t_vdl(stream)->handle,"vixGetVersion");
if(ver) version = (*ver)();
if(version != VIDIX_VERSION)
{
drv_err:
if(t_vdl(stream)->handle) dlclose(t_vdl(stream)->handle);
goto err;
}
probe = dlsym(t_vdl(stream)->handle,"vixProbe");
if(probe) { if((*probe)(verbose)!=0) goto drv_err; }
else goto drv_err;
fill:
if(!vdl_fill_driver(stream)) goto drv_err;
}
else
if(vdl_find_driver(stream,path,cap,verbose)) goto fill;
else goto err;
if(t_vdl(stream)->init) if(t_vdl(stream)->init()) goto drv_err;
return stream;
}
void vdlClose(VDL_HANDLE stream)
{
if(t_vdl(stream)->destroy) t_vdl(stream)->destroy();
dlclose(t_vdl(stream)->handle);
memset(stream,0,sizeof(vdl_stream_t)); /* <- it's not stupid */
free(stream);
}
int vdlGetCapability(VDL_HANDLE handle, vidix_capability_t *cap)
{
return t_vdl(handle)->get_caps(cap);
}
int vdlQueryFourcc(VDL_HANDLE handle,vidix_fourcc_t *f)
{
return t_vdl(handle)->query_fourcc(f);
}
int vdlConfigPlayback(VDL_HANDLE handle,vidix_playback_t *p)
{
return t_vdl(handle)->config_playback(p);
}
int vdlPlaybackOn(VDL_HANDLE handle)
{
return t_vdl(handle)->playback_on();
}
int vdlPlaybackOff(VDL_HANDLE handle)
{
return t_vdl(handle)->playback_off();
}
int vdlPlaybackFrameSelect(VDL_HANDLE handle, unsigned frame_idx )
{
return t_vdl(handle)->frame_sel ? t_vdl(handle)->frame_sel(frame_idx) : ENOSYS;
}
int vdlPlaybackGetEq(VDL_HANDLE handle, vidix_video_eq_t * e)
{
return t_vdl(handle)->get_eq ? t_vdl(handle)->get_eq(e) : ENOSYS;
}
int vdlPlaybackSetEq(VDL_HANDLE handle, const vidix_video_eq_t * e)
{
return t_vdl(handle)->set_eq ? t_vdl(handle)->set_eq(e) : ENOSYS;
}
int vdlPlaybackCopyFrame(VDL_HANDLE handle, const vidix_dma_t * f)
{
return t_vdl(handle)->copy_frame ? t_vdl(handle)->copy_frame(f) : ENOSYS;
}
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