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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "mp_msg.h"
#include <jpeglib.h>
#define UINT16 IJPG_UINT16
#define INT16 IJPG_INT16
#include <setjmp.h>
#include "mpbswap.h"
#include "vd_internal.h"
static vd_info_t info = {
"JPEG Images decoder",
"ijpg",
"Pontscho",
"based on vd_mpng.c",
"uses Independent JPEG Group's jpeglib"
};
LIBVD_EXTERN(ijpg)
static int last_w=-1;
static int last_h=-1;
static int last_depth=-1;
// to set/get/query special features/parameters
static int control(sh_video_t *sh,int cmd,void* arg,...){
if (cmd == VDCTRL_QUERY_FORMAT) {
int format = *(int *)arg;
if ((last_depth == 24 && format == IMGFMT_RGB24) ||
(last_depth == 8 && format == IMGFMT_Y8 ))
return CONTROL_TRUE;
return CONTROL_FALSE;
}
return CONTROL_UNKNOWN;
}
// init driver
static int init(sh_video_t *sh){
last_w=-1;
return 1;
}
// uninit driver
static void uninit(sh_video_t *sh){
}
//mp_image_t* mpcodecs_get_image(sh_video_t *sh, int mp_imgtype, int mp_imgflag, int w, int h);
typedef struct
{
struct jpeg_source_mgr pub;
unsigned char * inbuf;
int bufsize;
} my_source_mgr;
typedef my_source_mgr * my_src_ptr;
METHODDEF(void) init_source (j_decompress_ptr cinfo)
{
}
METHODDEF(boolean) fill_input_buffer (j_decompress_ptr cinfo)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
src->pub.next_input_byte = src->inbuf;
src->pub.bytes_in_buffer = src->bufsize;
return TRUE;
}
METHODDEF(void) skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
if (num_bytes > 0)
{
while (num_bytes > (long) src->pub.bytes_in_buffer)
{
num_bytes -= (long) src->pub.bytes_in_buffer;
(void) fill_input_buffer(cinfo);
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
METHODDEF(void) term_source (j_decompress_ptr cinfo) { }
GLOBAL(void) jpeg_buf_src ( j_decompress_ptr cinfo, char * inbuf,int bufsize )
{
my_src_ptr src;
if (cinfo->src == NULL) cinfo->src=malloc( sizeof( my_source_mgr ) );
src = (my_src_ptr) cinfo->src;
src->pub.init_source = init_source;
src->pub.fill_input_buffer = fill_input_buffer;
src->pub.skip_input_data = skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart;
src->pub.term_source = term_source;
src->inbuf = inbuf;
src->bufsize=bufsize;
src->pub.bytes_in_buffer = 0;
src->pub.next_input_byte = NULL;
}
struct my_error_mgr
{
struct jpeg_error_mgr pub;
jmp_buf setjmp_buffer;
};
typedef struct my_error_mgr * my_error_ptr;
METHODDEF(void) my_error_exit (j_common_ptr cinfo)
{
my_error_ptr myerr=(my_error_ptr) cinfo->err;
(*cinfo->err->output_message) (cinfo);
longjmp(myerr->setjmp_buffer, 1);
}
// decode a frame
static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){
struct jpeg_decompress_struct cinfo;
struct my_error_mgr jerr;
mp_image_t * mpi = NULL;
int width,height,depth,i;
if ( len <= 0 ) return NULL; // skipped frame
memset(&cinfo, 0, sizeof(cinfo));
memset(&jerr, 0, sizeof(jerr));
cinfo.err=jpeg_std_error( &jerr.pub );
jerr.pub.error_exit=my_error_exit;
if( setjmp( jerr.setjmp_buffer ) )
{
mp_msg( MSGT_DECVIDEO,MSGL_ERR,"[ijpg] setjmp error ...\n" );
return NULL;
}
jpeg_create_decompress( &cinfo );
jpeg_buf_src( &cinfo,data,len );
jpeg_read_header( &cinfo,TRUE );
sh->disp_w=width=cinfo.image_width;
sh->disp_h=height=cinfo.image_height;
jpeg_start_decompress( &cinfo );
depth=cinfo.output_components * 8;
switch( depth ) {
case 8:
case 24: break;
default: mp_msg( MSGT_DECVIDEO,MSGL_ERR,"Sorry, unsupported JPEG colorspace: %d.\n",depth ); return NULL;
}
if ( last_w!=width || last_h!=height || last_depth != depth )
{
last_depth = depth;
if(!mpcodecs_config_vo( sh,width,height, depth == 8 ? IMGFMT_Y8 : IMGFMT_RGB24 )) return NULL;
last_w=width; last_h=height;
}
mpi=mpcodecs_get_image( sh,MP_IMGTYPE_TEMP,MP_IMGFLAG_ACCEPT_STRIDE,width,height );
if ( !mpi ) return NULL;
for ( i=0;i < height;i++ )
{
unsigned char * drow = mpi->planes[0] + mpi->stride[0] * i;
jpeg_read_scanlines( &cinfo,(JSAMPLE**)&drow,1 );
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
return mpi;
}
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