Function avifDecoderItemValidateProperties

src/read.c:1240–1416

}

static avifResult avifDecoderItemValidateProperties(const avifDecoderItem * item,
                                                    const char * configPropName,
                                                    avifDiagnostics * diag,
                                                    const avifStrictFlags strictFlags)
{
    const avifProperty * const configProp = avifPropertyArrayFind(&item->properties, configPropName);
    if (!configProp) {
        // An item configuration property box is mandatory in all valid AVIF configurations. Bail out.
        avifDiagnosticsPrintf(diag, "Item ID %u of type '%.4s' is missing mandatory %s property", item->id, (const char *)item->type, configPropName);
        return AVIF_RESULT_BMFF_PARSE_FAILED;
    }

    if (!memcmp(item->type, "grid", 4)) {
        for (uint32_t i = 0; i < item->meta->items.count; ++i) {
            avifDecoderItem * tile = item->meta->items.item[i];
            if (tile->dimgForID != item->id) {
                continue;
            }
            // Tile item types were checked in avifDecoderGenerateImageTiles(), no need to do it here.

            // MIAF (ISO 23000-22:2019), Section 7.3.11.4.1:
            //   All input images of a grid image item shall use the same [...] chroma sampling format,
            //   and the same decoder configuration (see 7.3.6.2).

            // The chroma sampling format is part of the decoder configuration.
            const avifProperty * tileConfigProp = avifPropertyArrayFind(&tile->properties, configPropName);
            if (!tileConfigProp) {
                avifDiagnosticsPrintf(diag,
                                      "Tile item ID %u of type '%.4s' is missing mandatory %s property",
                                      tile->id,
                                      (const char *)tile->type,
                                      configPropName);
                return AVIF_RESULT_BMFF_PARSE_FAILED;
            }
            // configProp was copied from a tile item to the grid item. Comparing tileConfigProp with it
            // is equivalent to comparing tileConfigProp with the configPropName from the first tile.
            if ((tileConfigProp->u.av1C.seqProfile != configProp->u.av1C.seqProfile) ||
                (tileConfigProp->u.av1C.seqLevelIdx0 != configProp->u.av1C.seqLevelIdx0) ||
                (tileConfigProp->u.av1C.seqTier0 != configProp->u.av1C.seqTier0) ||
                (tileConfigProp->u.av1C.highBitdepth != configProp->u.av1C.highBitdepth) ||
                (tileConfigProp->u.av1C.twelveBit != configProp->u.av1C.twelveBit) ||
                (tileConfigProp->u.av1C.monochrome != configProp->u.av1C.monochrome) ||
                (tileConfigProp->u.av1C.chromaSubsamplingX != configProp->u.av1C.chromaSubsamplingX) ||
                (tileConfigProp->u.av1C.chromaSubsamplingY != configProp->u.av1C.chromaSubsamplingY) ||
                (tileConfigProp->u.av1C.chromaSamplePosition != configProp->u.av1C.chromaSamplePosition)) {
                avifDiagnosticsPrintf(diag,
                                      "The fields of the %s property of tile item ID %u of type '%.4s' differs from other tiles",
                                      configPropName,
                                      tile->id,
                                      (const char *)tile->type);
                return AVIF_RESULT_BMFF_PARSE_FAILED;
            }
        }
    }

    const avifProperty * pixiProp = avifPropertyArrayFind(&item->properties, "pixi");
    if (!pixiProp && (strictFlags & AVIF_STRICT_PIXI_REQUIRED)) {
        // A pixi box is mandatory in all valid AVIF configurations. Bail out.