1 files changed, 147 insertions, 0 deletions
diff --git a/TOOLS/mwallp/jpeg.c b/TOOLS/mwallp/jpeg.c
new file mode 100644
index 0000000000..693c00c845
--- /dev/null
+++ b/TOOLS/mwallp/jpeg.c
@@ -0,0 +1,147 @@
+// based on vd_ijpg.c by Pontscho
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <jpeglib.h>
+#define UINT16 IJPG_UINT16
+#define INT16 IJPG_INT16
+
+#include <setjmp.h>
+
+#include <inttypes.h>
+
+#include "img_format.h"
+
+#include "swscale.h"
+#include "rgb2rgb.h"
+
+static SwsContext *swsContext=NULL;
+
+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;                                                         
+ size_t nbytes;                                                                                    
+ 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);
+}
+
+static struct     jpeg_decompress_struct cinfo;
+static struct     my_error_mgr jerr;
+
+// decode a frame
+int decode_jpeg(void* data,int len,char* dbuffer,int dwidth,int dheight, int dstride,int dbpp){
+ int	      width,height,depth,i;
+ int        row_stride;
+ unsigned char*	img=NULL;
+ int in_fmt=0;
+
+ if ( len <= 0 ) return 0; // skipped frame
+
+ cinfo.err=jpeg_std_error( &jerr.pub );
+ jerr.pub.error_exit=my_error_exit;
+ if( setjmp( jerr.setjmp_buffer ) )
+  {
+   return 0;
+  }
+  
+ jpeg_create_decompress( &cinfo );
+ jpeg_buf_src( &cinfo,data,len );
+ jpeg_read_header( &cinfo,TRUE );
+ width=cinfo.image_width;
+ height=cinfo.image_height;
+ jpeg_start_decompress( &cinfo );
+ depth=cinfo.output_components * 8;
+
+ switch( depth ) {
+   case 8: in_fmt=IMGFMT_Y8;break;
+   case 24: in_fmt=IMGFMT_RGB|24;break;
+   default: return 0;
+ }
+
+ row_stride=cinfo.output_width * cinfo.output_components;
+ img=malloc(row_stride * (height+1));
+
+ for ( i=0;i < height;i++ ){
+//    char* row=dbuffer+i*dstride;
+    char* row=img+row_stride*i;
+    jpeg_read_scanlines( &cinfo,(JSAMPLE**)&row,1 );
+ }
+ 
+ jpeg_finish_decompress(&cinfo);
+ jpeg_destroy_decompress(&cinfo);
+
+ swsContext= getSwsContextFromCmdLine(width,height, in_fmt, 
+    				      dwidth,dheight, IMGFMT_BGR|dbpp);
+
+ swsContext->swScale(swsContext,&img,&row_stride,0,height,&dbuffer, &dstride);
+ 
+ freeSwsContext(swsContext);
+
+ free(img);
+
+ return 1;
+}