that is a convenience function for trying to get the best picture
that matches a constraint. to get more than one, you should use
one of the iterator interfaces:
http://flac.sourceforge.net/api/group__flac__metadata.html
--- "Alex J. Ivasyuv" <industral at gmail.com> wrote:
> Hi all!
>
> I have a problem to get _all_ images from flac file.
> I have flac file with 3 images inside ( FLAC__METADATA_TYPE_PICTURE )
>
> How to get _all_ images with bool FLAC::Metadata::get_picture() func?
>
> This function is wrapper FLAC__bool FLAC__metadata_get_picture().
>
> flac-1.2.1/src/libFLAC/metadata_iterators.c:
> ...
> 285 FLAC_API FLAC__bool FLAC__metadata_get_picture(const char
> *filename,
> FLAC__StreamMetadata **picture, FLAC__StreamMetadata_Picture_Type
> type,
> const char *mime_type, const FLAC__byte *description, unsigned
> max_width, unsigned max_height, unsigned max_depth, unsigned
> max_colors)
> 286 {
> 287 FLAC__Metadata_SimpleIterator *it;
> 288 FLAC__uint64 max_area_seen = 0;
> 289 FLAC__uint64 max_depth_seen = 0;
> 290
> 291 FLAC__ASSERT(0 != filename);
> 292 FLAC__ASSERT(0 != picture);
> 293
> 294 *picture = 0;
> 295
> 296 it = FLAC__metadata_simple_iterator_new();
> 297 if(0 == it)
> 298 return false;
> 299 if(!FLAC__metadata_simple_iterator_init(it, filename,
> /*read_only=*/true, /*preserve_file_stats=*/true)) {
> 300 FLAC__metadata_simple_iterator_delete(it);
> 301 return false;
> 302 }
> 303 do {
> 304 if(FLAC__metadata_simple_iterator_get_block_type(it) =>
> FLAC__METADATA_TYPE_PICTURE) {
> 305 FLAC__StreamMetadata *obj =
> FLAC__metadata_simple_iterator_get_block(it);
> 306 FLAC__uint64 area =
> (FLAC__uint64)obj->data.picture.width *
> (FLAC__uint64)obj->data.picture.height;
> 307 /* check constraints */
> 308 if(
> 309 (type => (FLAC__StreamMetadata_Picture_Type)(-1)
> || type == obj->data.picture.type) &&
> 310 (mime_type == 0 || !strcmp(mime_type,
> obj->data.picture.mime_type)) &&
> 311 (description == 0 || !strcmp((const char
> *)description, (const char *)obj->data.picture.description)) &&
> 312 obj->data.picture.width <= max_width &&
> 313 obj->data.picture.height <= max_height
&&
> 314 obj->data.picture.depth <= max_depth &&
> 315 obj->data.picture.colors <= max_colors
&&
> 316 (area > max_area_seen || (area == max_area_seen
> &&
> obj->data.picture.depth > max_depth_seen))
> 317 ) {
> 318 if(*picture)
> 319 FLAC__metadata_object_delete(*picture);
> 320 *picture = obj; // <------- HERE
> 321 max_area_seen = area;
> 322 max_depth_seen = obj->data.picture.depth;
> 323 }
> 324 else {
> 325 FLAC__metadata_object_delete(obj);
> 326 }
> 327 }
> 328 } while(FLAC__metadata_simple_iterator_next(it));
> 329
> 330 FLAC__metadata_simple_iterator_delete(it);
> 331
> 332 return (0 != *picture);
> 333 }
> ...
>
> In line 320 picture always overwrite in do { } ... while ( ) cycle.
> So it means, that every time I will get only the last image from
> file.
> Am I right?
>
> So how to get all images?
> Thanks for any help.
>
> Bests,
>
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