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If EXIF parsing fails, fall through to reading the JPEG data with libjpeg to get the resolution.

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This commit is contained in:
Justin Maggard
2009-01-22 23:48:49 +00:00
parent 8a127b4e19
commit 577deb028b
2 changed files with 37 additions and 2 deletions
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37
metadata.c
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@@ -29,6 +29,8 @@
#include <sqlite3.h>
#include <taglib/tag_c.h>
#include <libexif/exif-loader.h>
#include <jpeglib.h>
#include <setjmp.h>
#include <avutil.h>
#include <avcodec.h>
#include <avformat.h>
@@ -342,12 +344,26 @@ GetAudioMetadata(const char * path, char * name)
return ret;
}
/* For libjpeg error handling */
jmp_buf setjmp_buffer;
static void
libjpeg_error_handler(j_common_ptr cinfo)
{
cinfo->err->output_message (cinfo);
longjmp(setjmp_buffer, 1);
return;
}
sqlite_int64
GetImageMetadata(const char * path, char * name)
{
ExifData *ed;
ExifEntry *e = NULL;
ExifLoader *l;
ExifTag tag;
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
FILE *infile;
int width=0, height=0, thumb=0;
off_t size;
char date[64], make[32], model[64];
@@ -373,7 +389,7 @@ GetImageMetadata(const char * path, char * name)
/* MIME hard-coded to JPEG for now, until we add PNG support */
asprintf(&m.mime, "image/jpeg");
ExifLoader * l = exif_loader_new();
l = exif_loader_new();
exif_loader_write_file(l, path);
ed = exif_loader_get_data(l);
exif_loader_unref(l);
@@ -435,6 +451,25 @@ GetImageMetadata(const char * path, char * name)
exif_data_unref(ed);
/* If EXIF parsing fails, then fall through to reading the JPEG data with libjpeg to get the resolution */
if( !width || !height )
{
infile = fopen(path, "r");
cinfo.err = jpeg_std_error(&jerr);
jerr.error_exit = libjpeg_error_handler;
jpeg_create_decompress(&cinfo);
if( setjmp(setjmp_buffer) )
goto error;
jpeg_stdio_src(&cinfo, infile);
jpeg_read_header(&cinfo, TRUE);
jpeg_start_decompress(&cinfo);
width = cinfo.output_width;
height = cinfo.output_height;
error:
jpeg_destroy_decompress(&cinfo);
fclose(infile);
}
if( width <= 640 && height <= 480 )
asprintf(&m.dlna_pn, "JPEG_SM;DLNA.ORG_OP=01;DLNA.ORG_CI=0");
else if( width <= 1024 && height <= 768 )